HZNP / Horizon Therapeutics Plc - تصريحات هيئة الأوراق المالية والبورصات، التقرير السنوي، بيان الوكيل

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US ˙ NASDAQ ˙ US44047T1097
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الإحصائيات الأساسية
LEI 529900P0GSQ79OOZEV53
CIK 1492426
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Horizon Therapeutics Plc
SEC Filings (Chronological Order)
توفر هذه الصفحة قائمة كاملة ومرتبة ترتيبًا زمنيًا لتصريحات هيئة الأوراق المالية والبورصات، باستثناء تصريحات الملكية التي نقدمها في مكان آخر.
October 16, 2023 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-35238 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY (Exact name of registr

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 EX-3.1

COMPANIES ACT 2014 PUBLIC LIMITED COMPANY ARTICLES OF ASSOCIATION HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY Effective as of 6 October 2023

Exhibit 3.1 Cert No.: 507678 COMPANIES ACT 2014 PUBLIC LIMITED COMPANY MEMORANDUM AND ARTICLES OF ASSOCIATION OF HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY Effective as of 6 October 2023 COMPANIES ACT 2014 PUBLIC LIMITED COMPANY MEMORANDUM OF ASSOCIATION OF HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 1. The name of the Company is: Horizon Therapeutics public limited company. 2. The Company is a p

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Material Modification to Rights of Security Holders, Completion of Acquisition or Disposition of Assets

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 6, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpo

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 6, 2023 S-8 POS

As filed with the Securities and Exchange Commission on October 6, 2023

As filed with the Securities and Exchange Commission on October 6, 2023 Registration No.

October 5, 2023 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 5, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpo

September 12, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 11, 2023 Horizon Therap

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 11, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of inco

September 5, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 5, 2023 Horizon Therape

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 5, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

September 1, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 1, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

August 8, 2023 EX-10.2

Amendment No. 10, dated June 16, 2023, to the Credit Agreement, dated May 7, 2015, as amended, by and among Horizon Therapeutics USA, Inc., as Borrower, Horizon Therapeutics Public Limited Company, as Irish Holdco and a guarantor, the subsidiary guarantors party thereto, as subsidiary guarantors, the lenders party thereto and Citibank, N.A., as administrative agent and collateral agent.

Exhibit 10.2 AMENDMENT No. 10, dated as of June 16, 2023 (this “Amendment”), to the Credit Agreement, dated as of May 7, 2015, by and among Horizon Therapeutics USA, Inc., a Delaware corporation (the “Borrower”), Horizon Therapeutics plc, an Irish public limited company (f/k/a Horizon Pharma Public Limited Company) (“Irish Holdco”), the Subsidiary Guarantors party thereto, the Lenders party theret

August 8, 2023 EX-10.1

Amendment No. 10 to the License Agreement, dated May 22, 2023, by and among F. Hoffmann-La Roche Ltd, Hoffman-La Roche Inc. and Horizon Therapeutics Ireland DAC (as successor in interest to River Vision Development Corp).

Exhibit 10.1 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT HORIZON THERAPEUTICS PLC TREATS AS PRIVATE OR CONFIDENTIAL Amendment No. 10 to the License Agreement This Amendment No. 10 to the License Agreement (“Amendment”) is entered into as of the 22nd day of May 2023 (“Amendment Effective

August 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2023 Horizon Therapeuti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpor

August 8, 2023 EX-99.2

Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to the pending transaction with Amgen Inc., development, manufacturing and commercialization plans; expected timing of

Investor Presentation Horizon Therapeutics plc August 2023 Exhibit 99.2 Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to the pending transaction with Amgen Inc., development, manufacturing and commercialization plans; expected timing of clinical trials and commercial launches; expected future milestones, pipeline

August 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON THE

August 8, 2023 EX-99.1

Horizon Therapeutics plc Reports Second-Quarter 2023 Financial Results Second-Quarter 2023 Results: — Net Sales of $945.0 Million, Representing Year-Over-Year Growth of 11% Excluding Inflammation Medicines — — GAAP Net Income of $127.1 Million; Adjus

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Second-Quarter 2023 Financial Results Second-Quarter 2023 Results: — Net Sales of $945.0 Million, Representing Year-Over-Year Growth of 11% Excluding Inflammation Medicines — — GAAP Net Income of $127.1 Million; Adjusted EBITDA of $320.4 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $445.5 Million — — KRYSTEXXA® (pegloticase injection)

July 28, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2023 Horizon Therapeutic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incor

June 30, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

June 5, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 2, 2023 Horizon Therapeutics

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 2, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorporat

May 18, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 17, 2023 Horizon Therapeutics

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 17, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorporat

May 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON TH

May 3, 2023 EX-99.1

Horizon Therapeutics plc Reports First-Quarter 2023 Financial Results First-Quarter 2023 Results: — Net Sales of $832.1 Million — — GAAP Net Income of $54.7 Million; Adjusted EBITDA of $232.9 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $405

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports First-Quarter 2023 Financial Results First-Quarter 2023 Results: — Net Sales of $832.1 Million — — GAAP Net Income of $54.7 Million; Adjusted EBITDA of $232.9 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $405.3 Million — — KRYSTEXXA® (pegloticase injection) Net Sales of $187.0 Million — — UPLIZNA® (inebilizumab-cdon) Net Sales of $53.8

May 3, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorporati

April 17, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 17, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpor

April 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 10, 2023 Horizon Therapeuti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 10, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpor

March 1, 2023 EX-10

Form of Retention Bonus Agreement entered into by and between Horizon Therapeutics Public Limited Company and certain of its officers and employees.

Exhibit 10.56 [•], 2022 [Name] [Address] Re: Retention Bonus Agreement Dear [•]: In connection with the proposed sale (the “Transaction”) of Horizon Therapeutics plc (the “Company”) to Amgen Inc., the Company has selected you, in light of your contributions to date, to receive a special retention bonus (the “Retention Bonus”) in accordance with the terms of this letter agreement (this “Agreement”)

March 1, 2023 EX-10

Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy, as amended.

Exhibit 10.3 Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy Amended Effective: October 26, 2022 Each member of the Board of Directors (the “Board”) of Horizon Therapeutics Public Limited Company (the “Company”) other than (1) any member who is affiliated with any holder of more than 5% of the Company’s ordinary shares or (2) any member serving as an employee

March 1, 2023 EX-10

Form of Excise Tax Gross-Up Agreement entered into by and between Horizon Therapeutics Public Limited Company and certain of its officers and employees.

Exhibit 10.57 EXCISE TAX GROSS-UP AGREEMENT THIS EXCISE TAX GROSS-UP AGREEMENT (this “Agreement”), by and between Horizon Therapeutics plc, a public limited company incorporated under the laws of Ireland (with registration number 507678) (the “Company”), and [EXECUTIVE] (the “Executive” and, together with the Company, the “Parties”) is effective as of [], 2023 (the “Effective Date”). WHEREAS, the

March 1, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2023 Horizon Therapeutic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorpora

March 1, 2023 EX-10

License Agreement, dated August 12, 1998, by and among Mountain View Pharmaceuticals, Inc., Duke University and Horizon Therapeutics Ireland DAC (as successor in interest to Bio-Technology General Corporation), as amended November 12, 2001, August 30, 2010, March 12, 2014, July 16, 2015 and January 14, 2016.

Exhibit 10.13 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT HORIZON THERAPEUTICS PLC TREATS AS PRIVATE OR CONFIDENTIAL LICENSE AGREEMENT THIS LICENSE AGREEMENT is made and entered into as of the 12th day of August 1998, by and among Mountain View Pharmaceuticals, Inc., Duke University, an

March 1, 2023 EX-99.1

Horizon Therapeutics plc Reports Fourth-Quarter and Full-Year 2022 Financial Results Fourth-Quarter 2022 Results: — Net Sales of $942.0 Million — — GAAP Net Income of $120.4 Million; Adjusted EBITDA of $357.5 Million; Includes $37.3 Million of Acquir

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Fourth-Quarter and Full-Year 2022 Financial Results Fourth-Quarter 2022 Results: — Net Sales of $942.0 Million — — GAAP Net Income of $120.4 Million; Adjusted EBITDA of $357.5 Million; Includes $37.3 Million of Acquired IPR&D and Milestones Expenses — — TEPEZZA® (teprotumumab-trbw) Net Sales of $493.5 Million — — KRYSTEXXA® (pegloticase injecti

March 1, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON THERAPE

March 1, 2023 EX-21

Subsidiaries of Horizon Therapeutics Public Limited Company.

Exhibit 21.1 Subsidiaries of Horizon Therapeutics Public Limited Company: NAME: JURISDICTION OF INCORPORATION: Horizon Medicines LLC Delaware Horizon Therapeutics U.S. Holding LLC Delaware Horizon Properties Holding LLC Delaware Horizon Therapeutics Brasil Ltda Brazil Horizon Therapeutics Capital Limited Ireland Horizon Therapeutics Finance Limited Ireland Horizon Therapeutics Finance S.à.r.l Luxe

February 24, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2023 Horizon Therape

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

February 17, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

February 9, 2023 SC 13G/A

HZNP / Horizon Pharma plc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Horizon Therapeutics plc Title of Class of Securities: Common Stock CUSIP Number: G46188101 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

February 8, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A 1 d391802ddefa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

January 31, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 30, 2023 Horizon Therapeu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 30, 2023 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorp

January 31, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

January 27, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

January 27, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

January 24, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

January 24, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

January 23, 2023 DEFM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFM14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 30, 2022 EX-FILING FEES

Calculation of Filing Fee Table SCHEDULE 14A (Form Type) HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY (Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Proposed Maximum Aggregate Value of Transaction Fee Rate Amount of Fi

Exhibit 107 Calculation of Filing Fee Table SCHEDULE 14A (Form Type) HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY (Name of Registrant as Specified in its Charter) Table 1: Transaction Valuation Proposed Maximum Aggregate Value of Transaction Fee Rate Amount of Filing Fee Fees to be Paid $27,533,994,129.

December 30, 2022 PREM14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

PREM14A 1 d418961dprem14a.htm PREM14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as

December 12, 2022 EX-99.3

Hi everyone,

EX-99.3 Exhibit 99.3 Hi everyone, Today we announced that Horizon has entered into an agreement to be acquired by Amgen for $116.50 per share, in cash, or approximately $28 billion. Here is a link to the announcement that was issued this morning: [link]. As many of you know, Amgen is a leading biotechnology company headquartered in Thousand Oaks, California. They offer more than 25 medicines aroun

December 12, 2022 EX-99.2

Transaction Frequently Asked Questions (“Transaction FAQ”)

EX-99.2 Exhibit 99.2 Transaction Frequently Asked Questions (“Transaction FAQ”) This document includes general FAQs on the agreement as well as FAQs specific for Horizon Therapeutics plc employees. Agreement FAQs 1. What was announced? Horizon entered into an agreement to be acquired for approximately $28 billion by Amgen, a leading biotechnology company located in Thousand Oaks, California. Amgen

December 12, 2022 EX-99.4

Dear [Partner],

EX-99.4 Exhibit 99.4 Dear [Partner], We announced that Horizon has entered into an agreement to be acquired by Amgen. Here is a link to the announcement that was issued this morning: [link]. As a valued partner, I wanted to reach out to you with this news and provide additional context. Until the transaction is completed, which is expected to occur in the first half of 2023, subject to regulatory

December 12, 2022 EX-99.5

Horizon Therapeutics to be Acquired by Amgen

EX-99.5 Exhibit 99.5 Subject: Horizon Therapeutics to be Acquired by Amgen Good morning, Today we announced that Horizon has entered into an agreement to be acquired by Amgen for $116.50 per share in cash, or approximately $28 billion. This represents a 48 percent premium to Horizon’s closing price of $78.76 on November 29, 2022 (being the last day before Horizon’s issuance of an announcement of a

December 12, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 10, 2022 Horizon Therape

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 10, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

December 12, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

December 12, 2022 EX-2.2

Appendix 3 to the Rule 2.7 Announcement, dated as of December 12, 2022 (Conditions Appendix) (incorporated by reference to Exhibit 2.2 to Horizon Therapeutics Public Limited Company’s Current Report on Form 8-K, filed on December 12, 2022).

EX-2.2 Exhibit 2.2 APPENDIX 3 CONDITIONS OF THE ACQUISITION AND THE SCHEME The Acquisition and the Scheme will comply with the Irish Takeover Rules and, where relevant, the rules and regulations of the U.S. Exchange Act, the Irish Companies Act and the Nasdaq, and are subject to the terms and conditions set out in this Announcement and to be set out in the Scheme Document. The Acquisition and the

December 12, 2022 EX-2.1

Transaction Agreement, dated December 11, 2022, by and among Amgen Inc., Pillartree Limited and Horizon Therapeutics Public Limited Company (incorporated by reference to Exhibit 2.1 to Horizon Therapeutics Public Limited Company’s Current Report on Form 8-K, filed on December 12, 2022).

EX-2.1 Exhibit 2.1 Execution Version TRANSACTION AGREEMENT dated as of December 11, 2022 among AMGEN INC. PILLARTREE LIMITED and HORIZON THERAPEUTICS PLC - TABLE OF CONTENTS Page SECTION 1. INTERPRETATION 1 1.1 Definitions 1 1.2 Construction 20 SECTION 2. RULE 2.7 ANNOUNCEMENT AND SCHEME DOCUMENT 21 2.1 Rule 2.7 Announcement 21 2.2 The Scheme 22 2.3 Change in Shares 23 2.4 Company Equity Award Hol

December 12, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 10, 2022 Horizon Therape

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 10, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

December 12, 2022 EX-99.1

RECOMMENDED CASH OFFER HORIZON THERAPEUTICS PLC Pillartree Limited, a newly formed private limited company wholly owned by Amgen Inc. to be implemented by way of a scheme of arrangement under Chapter 1 of Part 9 of the Companies Act 2014

EX-99.1 Exhibit 99.1 NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF SUCH JURISDICTION THIS ANNOUNCEMENT IS BEING MADE PURSUANT TO RULE 2.7 OF THE IRISH TAKEOVER RULES FOR IMMEDIATE RELEASE December 12, 2022 RECOMMENDED CASH OFFER for HORIZON THERAPEUTICS PLC by P

November 29, 2022 EX-99.1

Important Notices

EX-99.1 Exhibit 99.1 NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY (IN WHOLE OR IN PART) IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF SUCH JURISDICTION. THIS IS AN ANNOUNCEMENT OF A POSSIBLE OFFER UNDER RULE 2.4 OF THE IRISH TAKEOVER PANEL ACT, 1997, TAKEOVER RULES, 2022 (THE “IRISH TAKEOVER RULES”). IT IS NOT AN ANNOU

November 29, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 29, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incor

November 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZO

November 2, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 98-1195602 (State or other jurisdiction of incorp

November 2, 2022 EX-99.1

Horizon Therapeutics plc Reports Third-Quarter 2022 Financial Results; Increases Full-Year 2022 Net Sales and Adjusted EBITDA Guidance; Increases TEPEZZA and KRYSTEXXA Peak Annual Net Sales Expectations Third-Quarter 2022 Results: — Net Sales of $925

Exhibit 99.1 Horizon Therapeutics plc Reports Third-Quarter 2022 Financial Results; Increases Full-Year 2022 Net Sales and Adjusted EBITDA Guidance; Increases TEPEZZA and KRYSTEXXA Peak Annual Net Sales Expectations Third-Quarter 2022 Results: ? Net Sales of $925.4 Million ? ? GAAP Net Income of $135.8 Million; Adjusted EBITDA of $335.3 Million, Which Includes $19.0 Million of Acquired IPR&D and M

October 7, 2022 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 7, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inc

August 3, 2022 EX-10.3

Executive Employment Agreement, effective as of November 1, 2021, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Aaron Cox.

Exhibit 10.3 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERAPEUTICS PLC AND HORIZON THERAPEUTICS USA, INC. AND AARON L. COX This Executive Employment Agreement (hereinafter referred to as the “Agreement”), is entered into by and between Horizon Therapeutics PLC., an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corporation, ha

August 3, 2022 EX-10.5

Executive Employment Agreement, effective as of May 15, 2022, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Jacopo Leonardi.

Exhibit 10.5 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERAPEUTICS PLC AND HORIZON THERAPEUTICS USA, INC. AND JACOPO LEONARDI This Executive Employment Agreement (hereinafter referred to as the “Agreement”), is entered into by and between Horizon Therapeutics plc, an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corporation,

August 3, 2022 EX-10.4

Executive Employment and Transition Agreement, dated May 11, 2022, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Paul W. Hoelscher.

Exhibit 10.4 EXECUTIVE EMPLOYMENT AND TRANSITION AGREEMENT This Executive Employment and Transition Agreement (this “Agreement”) is entered into on May 11, 2022, by and among Horizon Therapeutics plc, an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corporation, having a principal place of business at 1 Horizon Way, Deerfield, Illinois 60

August 3, 2022 EX-10.6

Amendment No. 4 to Commercial Supply Agreement, dated May 31, 2022, by and between AGC Biologics A/S (formerly known as CMC Biologics A/S) and Horizon Therapeutics Ireland DAC.

Exhibit 10.6 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT HORIZON THERAPEUTICS PLC TREATS AS PRIVATE OR CONFIDENTIAL CONFIDENTIAL AMENDMENT NO. 4 TO COMMERCIAL SUPPLY AGREEMENT This Amendment No. 4 (the “Amendment” or this “Amendment No. 4”) to the Commercial Supply Agreement by and betw

August 3, 2022 S-8

As filed with the Securities and Exchange Commission on August 3, 2022

As filed with the Securities and Exchange Commission on August 3, 2022 Registration No.

August 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

August 3, 2022 EX-FILING FEES

Filing Fee Table

EX-FILING FEES 4 d378309dexfilingfees.htm EX-FILING FEES Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Horizon Therapeutics Public Limited Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offer

August 3, 2022 EX-99.1

Horizon Therapeutics plc Reports Second-Quarter 2022 Financial Results and Revises Full-Year 2022 Net Sales and Adjusted EBITDA Guidance Second-Quarter 2022 Results: — Net Sales of $876.4 Million; Orphan Segment Net Sales Increased 13% to $841.3 Mill

Exhibit 99.1 Horizon Therapeutics plc Reports Second-Quarter 2022 Financial Results and Revises Full-Year 2022 Net Sales and Adjusted EBITDA Guidance Second-Quarter 2022 Results: — Net Sales of $876.4 Million; Orphan Segment Net Sales Increased 13% to $841.3 Million — — GAAP Net Income of $61.0 Million; Adjusted EBITDA of $306.6 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $479.8 Million

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON THE

May 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON TH

May 4, 2022 EX-99.1

Horizon Therapeutics plc Reports First-Quarter 2022 Financial Results First-Quarter 2022 Results: — Net Sales of $885.2 Million — — GAAP Net Income of $204.3 Million; Adjusted EBITDA of $371.2 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $50

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports First-Quarter 2022 Financial Results First-Quarter 2022 Results: — Net Sales of $885.2 Million — — GAAP Net Income of $204.3 Million; Adjusted EBITDA of $371.2 Million — — TEPEZZA® (teprotumumab-trbw) Net Sales of $501.5 Million — — KRYSTEXXA® (pegloticase injection) Net Sales of $140.7 Million — — Cash Position of $1.64 Billion as of March 31,

May 4, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

May 4, 2022 EX-10.4

Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy, as amended.

Exhibit 10.4 Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy Amended Effective: April 28, 2022 Each member of the Board of Directors (the ?Board?) of Horizon Therapeutics Public Limited Company (the ?Company?) other than (1) any member who is affiliated with any holder of more than 5% of the Company?s ordinary shares or (2) any member serving as an employee of

May 2, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

May 2, 2022 EX-99.1

HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN

Exhibit 99.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans? Available Reserve plus any Returning Shares will become available for issuance pursuant to Awards

March 17, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEFA14A 1 d89128ddefa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as p

March 17, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14

March 7, 2022 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14

March 1, 2022 EX-10.63

Master Manufacturing Services Agreement, dated October 15, 2018, by and between Patheon Pharmaceuticals Inc. and Horizon Medicines LLC.

Exhibit 10.63 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT HORIZON THERAPEUTICS PLC TREATS AS PRIVATE OR CONFIDENTIAL Master Manufacturing Services Agreement Master Manufacturing Services Agreement October 15, 2018 Master Manufacturing Services Agreement Table of Contents ARTICLE 1 STRUC

March 1, 2022 EX-10.64

Release and Waiver of Claims of Brian Beeler, dated as of January 6, 2022.

Exhibit 10.64 RELEASE AND WAIVER OF CLAIMS In consideration of the payments and other benefits set forth in Section 4.4 of the Executive Employment Agreement dated May 7, 2015, as amended by the First Amendment to Executive Employment Agreement dated May 4, 2017, (the ?Employment Agreement?), to which this form is attached, and the payments and other benefits set forth in Exhibit A, attached heret

March 1, 2022 EX-10.62

Horizon Therapeutics Public Limited Company Amended and Restated 2018 Equity Incentive Plan (assumed from Viela Bio, Inc.), as amended, and 2018 Restricted Stock Unit Award Sub-Plan and Forms of RSU Award Grant Notice and Forms of Award Agreement (RSU Award) thereunder.

Exhibit 10.62 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2018 EQUITY INCENTIVE PLAN (As Amended and Restated Effective July 29, 2021) 1. PURPOSES OF THE PLAN; ASSUMPTION OF PLAN. The purposes of the Plan are to attract and retain the best available personnel, to provide additional incentives to Employees, Directors and Consultants and to promote the success of the business of

March 1, 2022 EX-21.1

Subsidiaries of Horizon Therapeutics Public Limited Company.

Exhibit 21.1 Subsidiaries of Horizon Therapeutics Public Limited Company: NAME: JURISDICTION OF INCORPORATION: Horizon Medicines LLC Delaware Horizon Ophthalmology, Inc Delaware Horizon Orphan Holdings LLC Delaware Horizon Orphan LLC Delaware Horizon Properties Holding LLC Delaware Horizon Therapeutics Brasil Ltda Brazil Horizon Therapeutics Capital Limited Ireland Horizon Therapeutics Finance Lim

March 1, 2022 EX-10.66

Executive Employment Agreement, effective as of February 28, 2022, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Sean M. Clayton (incorporated by reference to Exhibit 10.66 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on March 1, 2022).

Exhibit 10.66 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERAPEUTICS PLC AND HORIZON THERAPEUTICS USA, INC. AND SEAN CLAYTON This Executive Employment Agreement (hereinafter referred to as the ?Agreement?), is entered into by and between Horizon Therapeutics plc, an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corporation, ha

March 1, 2022 EX-10.3

Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy, as amended.

Exhibit 10.3 Horizon Therapeutics Public Limited Company Non-Employee Director Compensation Policy Amended Effective: October 28, 2021 Each member of the Board of Directors (the ?Board?) of Horizon Therapeutics Public Limited Company (the ?Company?) other than (1) any member who is affiliated with any holder of more than 5% of the Company?s ordinary shares or (2) any member serving as an employee

March 1, 2022 EX-99.1

Horizon Therapeutics plc Reports Fourth-Quarter 2021 and Full-Year 2021 Financial Results; Announces Full-Year 2022 Guidance Fourth-Quarter 2021 Results: — Net Sales of $1.01 Billion Increased 36% — — GAAP Net Income of $173.2 Million; Adjusted EBITD

Exhibit 99.1 Horizon Therapeutics plc Reports Fourth-Quarter 2021 and Full-Year 2021 Financial Results; Announces Full-Year 2022 Guidance Fourth-Quarter 2021 Results: ? Net Sales of $1.01 Billion Increased 36% ? ? GAAP Net Income of $173.2 Million; Adjusted EBITDA of $416.0 Million ? ? TEPEZZA? (teprotumumab-trbw) Net Sales of $589.6 Million Increased 72% ? ? KRYSTEXXA? (pegloticase injection) Net

March 1, 2022 EX-10.65

Release and Waiver of Claims of Barry Moze, dated as of January 10, 2022.

Exhibit 10.65 RELEASE AND WAIVER OF CLAIMS In consideration of the payments and other benefits set forth in Exhibit A, attached hereto, I, Barry Moze, hereby furnish Horizon Therapeutics PLC, and Horizon Therapeutics USA, Inc. (together the ?Company?), with the following release and waiver (?Release and Waiver?). In exchange for the consideration provided to me in Exhibit A that I am not otherwise

March 1, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incor

March 1, 2022 EX-10.52

Horizon Therapeutics Public Limited Company Amended and Restated 2020 Equity Incentive Plan, as amended, and 2020 Restricted Stock Unit Award Sub-Plan and Form of Option Agreement, Form of Stock Option Grant Notice, Forms of Restricted Stock Unit Agreement and Forms of Restricted Stock Unit Grant Notice thereunder.

Exhibit 10.52 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans? Available Reserve plus any Returning Shares will become available for issuance pursuant to Award

March 1, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON THERAPE

February 10, 2022 SC 13G/A

HZNP / Horizon Pharma plc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Horizon Therapeutics plc Title of Class of Securities: Common Stock CUSIP Number: G46188101 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

January 10, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 10, 2022 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

January 10, 2022 EX-99.1

Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to Horizon’s full-year 2021 net sales and adjusted EBITDA guidance; expected financial performance and operating resul

Exhibit 99.1 th 40 Annual J.P. Morgan Healthcare Conference Tim Walbert Chairman, President and Chief Executive Officer Liz Thompson, Ph.D. Executive Vice President, Research and Development January 10, 2022 Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to Horizon?s full-year 2021 net sales and adjusted EBITDA gu

December 16, 2021 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 16, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of i

November 22, 2021 CORRESP

VIA EDGAR

VIA EDGAR November 22, 2021 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

November 3, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 3, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

November 3, 2021 EX-10.3

Horizon Therapeutics Public Limited Company 2014 Non-Employee Equity Plan, as amended, and Form of Option Agreement, Form of Stock Option Grant Notice, Forms of Restricted Stock Unit Agreement and Forms of Restricted Stock Unit Grant Notice thereunder (incorporated by reference to Exhibit 10.3 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on November 3, 2021).

Exhibit 10.3 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2014 NON-EMPLOYEE EQUITY PLAN 1. GENERAL. (a) Eligible Award Recipients. The persons eligible to receive Awards are Non-employee Directors and Consultants. This Plan is intended as the successor to the Horizon Pharma, Inc. 2011 Equity Incentive Plan with respect to grants to Non-employee Directors and Consultants. (b) Available Awards. The P

November 3, 2021 EX-10.1

Horizon Therapeutics Public Limited Company Amended and Restated 2020 Equity Incentive Plan and Form of Option Agreement, Form of Stock Option Grant Notice, Forms of Restricted Stock Unit Agreement and Forms of Restricted Stock Unit Grant Notice thereunder.

Exhibit 10.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans? Available Reserve plus any Returning Shares will become available for issuance pursuant to Awards

November 3, 2021 EX-99.1

Horizon Therapeutics plc Reports Record Third-Quarter 2021 Financial Results; Increasing Full-Year 2021 Net Sales and Adjusted EBITDA Guidance — Record Third-Quarter 2021 Net Sales of $1.037 Billion Increased 63 Percent; Third-Quarter 2021 GAAP Net I

Exhibit 99.1 Horizon Therapeutics plc Reports Record Third-Quarter 2021 Financial Results; Increasing Full-Year 2021 Net Sales and Adjusted EBITDA Guidance ? Record Third-Quarter 2021 Net Sales of $1.037 Billion Increased 63 Percent; Third-Quarter 2021 GAAP Net Income of $326.5 Million; Record Adjusted EBITDA of $509.0 Million ? ? Record TEPEZZA? (teprotumumab-trbw) Third-Quarter 2021 Net Sales of

November 3, 2021 EX-10.2

Horizon Therapeutics Public Limited Company Amended and Restated 2018 Equity Incentive Plan (assumed from Viela Bio, Inc.) and Form of RSU Award Grant Notice and Form of Award Agreement (RSU Award) thereunder.

Exhibit 10.2 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2018 EQUITY INCENTIVE PLAN (As Amended and Restated Effective July 29, 2021) 1. PURPOSES OF THE PLAN; ASSUMPTION OF PLAN. The purposes of the Plan are to attract and retain the best available personnel, to provide additional incentives to Employees, Directors and Consultants and to promote the success of the business of

November 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZO

October 25, 2021 CORRESP

VIA EDGAR

VIA EDGAR October 25, 2021 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

October 7, 2021 CORRESP

Appendix Excerpt from January 17, 2019 Letter

CORRESP 1 filename1.htm VIA EDGAR October 7, 2021 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attn: Brian Cascio, Accounting Branch Chief and Christie Wong, Staff Accountant Division of Corporation Finance Office of Healthcare and Insurance RE: Horizon Therapeutics Public Ltd Company Form 10-K for the Fiscal Year Ended

September 29, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 29, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of

August 27, 2021 CORRESP

VIA EDGAR

VIA EDGAR August 27, 2021 United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

August 4, 2021 EX-99.1

Horizon Therapeutics plc Reports Record Second-Quarter 2021 Financial Results; Increasing Full-Year 2021 Net Sales and Adjusted EBITDA Guidance — Record Second-Quarter 2021 Net Sales of $832.5 Million Increased 80 Percent; Second-Quarter 2021 GAAP Ne

Exhibit 99.1 Horizon Therapeutics plc Reports Record Second-Quarter 2021 Financial Results; Increasing Full-Year 2021 Net Sales and Adjusted EBITDA Guidance ? Record Second-Quarter 2021 Net Sales of $832.5 Million Increased 80 Percent; Second-Quarter 2021 GAAP Net Income of $158.1 Million; Adjusted EBITDA of $366.9 Million ? ? Record TEPEZZA? (teprotumumab-trbw) Second-Quarter 2021 Net Sales of $4

August 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON THE

August 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

May 5, 2021 10-Q

Quarterly Report - 10-Q

nte UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZO

May 5, 2021 EX-10.5

Executive Employment Agreement, effective as of March 15, 2021, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Elizabeth H.Z. Thompson (incorporated by reference to Exhibit 10.5 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on May 5, 2021).

Exhibit 10.5 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERPEUTICS PUBLIC PLC AND HORIZON THERAPEUTICS USA, INC. AND ELIZABETH H. Z. THOMPSON This Executive Employment Agreement (hereinafter referred to as the ?Agreement?), is entered into by and between Horizon Therapeutics PLC., an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delawa

May 5, 2021 EX-99.1

Horizon Therapeutics plc Reports First-Quarter 2021 Financial Results; Updating Full-Year 2021 Net Sales Guidance and Full-Year Adjusted EBITDA Guidance to Incorporate Recently Acquired Viela Bio, Inc. — First-Quarter 2021 Net Sales of $342.4 Million

Exhibit 99.1 Horizon Therapeutics plc Reports First-Quarter 2021 Financial Results; Updating Full-Year 2021 Net Sales Guidance and Full-Year Adjusted EBITDA Guidance to Incorporate Recently Acquired Viela Bio, Inc. ? First-Quarter 2021 Net Sales of $342.4 Million; First-Quarter 2021 GAAP Net Loss of $123.4 Million; Adjusted EBITDA of $45.8 Million ? ? First-Quarter 2021 Orphan Segment Net Sales In

May 5, 2021 EX-4.5

Third Supplemental Indenture, dated March 15, 2021, by and between Viela Bio, Inc. and U.S. Bank National Association (incorporated by reference to Exhibit 4.5 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on May 5, 2021).

Exhibit 4.5 THIRD SUPPLEMENTAL INDENTURE THIRD SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?), dated as of March 15, 2021, between Viela Bio, Inc., a Delaware corporation (the ?Guaranteeing Entity?), which is a subsidiary of the Issuer (as defined below), and U.S. Bank National Association, as trustee under the Indenture referred to below (the ?Trustee?). W I T N E S S E T H WHEREAS, Horiz

May 5, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incorpo

April 30, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 29, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

April 30, 2021 S-8

- S-8

As filed with the Securities and Exchange Commission on April 30, 2021 Registration No.

April 30, 2021 S-8

- S-8

As filed with the Securities and Exchange Commission on April 30, 2021 Registration No.

April 30, 2021 EX-99.1

Horizon Therapeutics Public Limited Company Amended and Restated 2018 Equity Incentive Plan (assumed from Viela Bio, Inc.) and Form of RSU Award Grant Notice and Form of Award Agreement (RSU Award) thereunder.

Exhibit 99.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2018 EQUITY INCENTIVE PLAN (As Amended and Restated Effective April 28, 2021) 1. PURPOSES OF THE PLAN; ASSUMPTION OF PLAN. The purposes of the Plan are to attract and retain the best available personnel, to provide additional incentives to Employees, Directors and Consultants and to promote the success of the business of

April 30, 2021 EX-99.1

HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN

EX-99.1 Exhibit 99.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY AMENDED AND RESTATED 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans’ Available Reserve plus any Returning Shares will become available for issuance pursuant t

March 30, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 30, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

March 17, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

March 17, 2021 DEF 14A

- DEF 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitte

March 15, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 15, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

March 15, 2021 EX-99.(A)(5)(F)

Press Release, issued by Horizon Therapeutics plc, dated March 15, 2021 (incorporated by reference to the Schedule TO-T/A filed by Ultimate Parent, Parent and Purchaser on March 15, 2021, as amended).

Exhibit (a)(5)(F) Horizon Therapeutics plc Completes Acquisition of Viela Bio, Inc.

March 15, 2021 EX-99.1

[The remainder of this page is intentionally left blank]

EX-99.1 Exhibit 99.1 Execution Version AMENDMENT No. 9, dated as of March 15, 2021 (this “Amendment”), to the Credit Agreement, dated as of May 7, 2015, by and among Horizon Therapeutics USA, Inc., a Delaware corporation (the “Borrower”), Horizon Therapeutics plc, an Irish public limited company (f/k/a Horizon Pharma Public Limited Company) (“Irish Holdco”), the Subsidiary Guarantors party thereto

March 15, 2021 SC TO-T/A

- SC TO-T/A

SC TO-T/A 1 d14488dsctota.htm SC TO-T/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 5) Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect wholl

March 12, 2021 EX-99.(D)(9)

Employment Offer Letter by and between Horizon Therapeutics and Jörn Drappa, M.D., Ph.D., dated March 10, 2021.

Exhibit (d)(9) March 4, 2021 Jorn Drappa, M.D., Ph.D. E-Transmission Dear Jorn, On behalf of Horizon Therapeutics Public Limited Company (?the Company?), it is my pleasure to offer you the position of the Company?s executive vice president, research and development, reporting directly to me. In this position you will be a member of the Executive Committee. This letter sets forth the proposed terms

March 12, 2021 EX-99.(D)(7)

Consulting Agreement by and between Horizon Therapeutics USA, Inc. and William Ragatz, dated March 11, 2021.

Exhibit (d)(7) CONSULTING AGREEMENT THIS CONSULTING AGREEMENT (?Agreement?) is made by and between HORIZON THERAPEUTICS USA, INC.

March 12, 2021 EX-99.(D)(6)

Consulting Agreement by and between Horizon Therapeutics USA, Inc. and Mitchell Chan, dated March 11, 2021.

Exhibit (d)(6) CONSULTING AGREEMENT THIS CONSULTING AGREEMENT (?Agreement?) is made by and between HORIZON THERAPEUTICS USA, INC.

March 12, 2021 SC TO-T/A

- SC TO-T/A

SC TO-T/A 1 d127825dsctota.htm SC TO-T/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 4) Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect whol

March 12, 2021 EX-99.(D)(8)

Consulting Agreement by and between Horizon Therapeutics USA, Inc. and Jim Kastenmayer, dated March 11, 2021.

Exhibit (d)(8) CONSULTING AGREEMENT THIS CONSULTING AGREEMENT (?Agreement?) is made by and between HORIZON THERAPEUTICS USA, INC.

March 5, 2021 PRE 14A

- PRE 14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitte

March 4, 2021 EX-99.(B)(2)

CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013

Exhibit (b)(2) CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013 MORGAN STANLEY SENIOR FUNDING, INC. 1585 Broadway New York, New York 10036 JPMORGAN CHASE BANK, N.A. 383 Madison Avenue New York, New York 10179 CONFIDENTIAL February 11, 2021 Horizon Therapeutics USA, Inc. c/o Horizon Therapeutics plc Connaught House, 1st Floor 1 Burlington Road Dublin 4, D04 C5Y6 Ireland A

March 4, 2021 EX-99.(D)(5)

Consulting Agreement by and between Parent and Zhengbin Yao, dated as of February 27, 2021.

Exhibit (d)(5) CONSULTING AGREEMENT THIS CONSULTING AGREEMENT (?Agreement?) is made by and between HORIZON THERAPEUTICS USA, INC.

March 4, 2021 SC TO-T/A

- SC TO-T/A

SC TO-T/A 1 d151283dsctota.htm SC TO-T/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 3) Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect whol

March 4, 2021 EX-99.(B)(1)

CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013

Exhibit (b)(i) CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013 MORGAN STANLEY SENIOR FUNDING, INC. 1585 Broadway New York, New York 10036 CONFIDENTIAL January 31, 2021 Horizon Therapeutics USA, Inc. c/o Horizon Therapeutics plc Connaught House, 1st Floor 1 Burlington Road Dublin 4, D04 C5Y6 Ireland Attention: Paul W. Hoelscher Project Venus Commitment Letter Ladies and

March 3, 2021 CORRESP

4401 EASTGATE MALL, SAN DIEGO, CA 92121-1909 T: (858) 550-6000 F: (858) 550-6420 WWW.COOLEY.COM

Barbara L. Borden VIA EDGAR +1 858 550 6064 [email protected] March 3, 2021 Daniel F. Duchovny Special Counsel Office of Mergers and Acquisitions Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Re: Viela Bio, Inc. Amended Schedule TO-T filed February 26, 2021 by Teiripic Merger Sub, Inc., et al. File No. 005-91167 Dear Mr. Duchovny: On behalf of Teiripic Merger Sub,

February 26, 2021 SC TO-T/A

- SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 2) Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect wholly owned subsidiary of Horizon Therapeuti

February 26, 2021 CORRESP

4401 EASTGATE MALL, SAN DIEGO, CA 92121-1909 T: (858) 550-6000 F: (858) 550-6420 WWW.COOLEY.COM

CORRESP 1 filename1.htm Barbara L. Borden VIA EDGAR +1 858 550 6064 [email protected] February 26, 2021 Daniel F. Duchovny Special Counsel Office of Mergers and Acquisitions Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549 Re: Viela Bio, Inc. Schedule TO-T filed February 12, 2021 by Teiripic Merger Sub, Inc., Horizon Therapeutics USA, Inc., and Horizon Therapeutics Pu

February 24, 2021 10-K

Annual Report - 10-K

inte s UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON

February 24, 2021 EX-21.1

Subsidiaries of Horizon Therapeutics Public Limited Company.

Exhibit 21.1 Subsidiaries of Horizon Therapeutics Public Limited Company: NAME: JURISDICTION OF INCORPORATION: Horizon Medicines LLC Delaware Horizon Ophthalmology, Inc Delaware Horizon Orphan Holdings LLC Delaware Horizon Orphan LLC Delaware Horizon Pharma Israel Holding Corp. Ltd Israel Horizon Therapeutics Capital Limited Ireland Horizon Therapeutics Finance Limited Ireland Horizon Therapeutics

February 24, 2021 EX-10.17

License Agreement, dated April 16, 1999, by and among Saul Brusilow, M.D., Brusilow Enterprises, Inc. and Horizon Therapeutics, LLC (as successor in interest to Medicis Pharmaceutical Corporation).

Exhibit 10.17 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. LICENSE AGREEMENT THIS LICENSE AGREEMENT (the ?Agreement?) is made and entered into as of April 16, 1999, among

February 24, 2021 EX-10.35

Amended and Restated License Agreement, dated May 31, 2017, by and between Horizon Orphan LLC and The Regents of the University of California.

Exhibit 10.35 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. AMENDED AND RESTATED LICENSE AGREEMENT BETWEEN HORIZON ORPHAN LLC AND THE REGENTS OF THE UNIVERSITY OF CALIFORN

February 24, 2021 EX-10.28

Manufacturing Services Agreement, dated November 15, 2010, by and among Patheon Pharmaceuticals Inc., Horizon Orphan LLC (as successor in interest to Raptor Therapeutics Inc.) and Horizon Pharma Europe B.V. (as successor in interest to Raptor Pharmaceuticals Europe B.V.), as amended April 5, 2012 and June 21, 2013.

Exhibit 10.28 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. Standard Form (PPI, April 2, 2010) Manufacturing Services Agreement November 15, 2010 Standard Form (PPI, April

February 24, 2021 EX-10.24

Commercial Supply Agreement, dated October 16, 2008, by and between Exelead, Inc. (formerly known as Sigma-Tau PharmaSource, Inc. (as successor in interest to Enzon Pharmaceuticals, Inc.)) and Horizon Therapeutics Ireland DAC (as successor in interest to Savient Pharmaceuticals, Inc.), as amended October 5, 2009, October 22, 2009 and July 29, 2014 (incorporated by reference to Exhibit 10.24 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.24 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. COMMERCIAL SUPPLY AGREEMENT This Commercial Supply Agreement (this ?Agreement?) is entered into as of October 1

February 24, 2021 EX-10.70

Second Amendment to Supply Agreement, effective as of January 22, 2021, by and between NOF Corporation and Horizon Therapeutics Ireland DAC (incorporated by reference to Exhibit 10.70 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.70 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. SECOND AMENDMENT TO THE SUPPLY AGREEMENT THIS SECOND AMENDMENT (?Amendment?) is entered into effective this 22n

February 24, 2021 EX-10.67

Executive Employment Agreement, effective as of August 3, 2020, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Daniel A. Camardo.

Exhibit 10.67 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERPEUTICS PUBLIC PLC AND HORIZON THERAPEUTICS USA, INC. AND DANIEL CAMARDO This Executive Employment Agreement (hereinafter referred to as the ?Agreement?), is entered into by and between Horizon Therapeutics PLC., an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corpor

February 24, 2021 EX-10.25

Fifth Amendment to Commercial Supply Agreement, effective as of August 31, 2016, by and between Horizon Therapeutics Ireland DAC and Bio-Technology General (Israel) Ltd (incorporated by reference to Exhibit 10.25 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.25 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. FIFTH AMENDMENT TO COMMERCIAL SUPPLY AGREEMENT THIS FIFTH AMENDMENT TO THE AGREEMENT (?Fifth Amendment?) is ent

February 24, 2021 EX-10.18

Settlement Agreement and First Amendment to License Agreement, dated August 21, 2007, by and among Saul Brusilow, M.D., Brusilow Enterprises, Inc., and Horizon Therapeutics, LLC (as successor in interest to Medicis Pharmaceutical Corporation and Ucyclyd Pharma, Inc.).

Exhibit 10.18 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. EXECUTION COPY SETTLEMENT AGREEMENT AND FIRST AMENDMENT TO LICENSE AGREEMENT This Settlement Agreement and Firs

February 24, 2021 EX-10.20

License Agreement, dated August 12, 1998, by and among Mountain View Pharmaceuticals, Inc., Duke University and Horizon Therapeutics Ireland DAC (as successor in interest to Bio-Technology General Corporation), as amended November 12, 2001, August 30, 2010, March 12, 2014 and July 16, 2015.

Exhibit 10.20 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. LICENSE AGREEMENT THIS LICENSE AGREEMENT is made and entered into as of the 12th day of August 1998, by and amo

February 24, 2021 EX-10.22

Supply Agreement, dated August 3, 2015, by and between NOF Corporation and Horizon Therapeutics Ireland DAC (as successor in interest to Crealta Pharmaceuticals LLC) (incorporated by reference to Exhibit 10.22 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.22 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. SUPPLY AGREEMENT Dated: August 3, 2015 between CREALTA Pharmaceuticals LLC and NOF CORPORATION 1 SUPPLY AGREEME

February 24, 2021 EX-99.1

Horizon Therapeutics plc Reports Record Fourth-Quarter and Full-Year 2020 Financial Results; Announces Full-Year 2021 Guidance -- Record Fourth-Quarter 2020 Net Sales of $745.3 Million Increased 105 Percent; Fourth-Quarter 2020 GAAP Net Income of $19

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Record Fourth-Quarter and Full-Year 2020 Financial Results; Announces Full-Year 2021 Guidance - Record Fourth-Quarter 2020 Net Sales of $745.3 Million Increased 105 Percent; Fourth-Quarter 2020 GAAP Net Income of $190.6 Million; Adjusted EBITDA of $371.0 Million - - Record Full-Year 2020 Net Sales of $2.20 Billion Driven by 110 Percent Growth i

February 24, 2021 EX-10.21

Commercial Supply Agreement, dated March 20, 2007, by and between Horizon Therapeutics Ireland DAC (as successor in interest to Savient Pharmaceuticals, Inc.) and Bio-Technology General (Israel) Ltd., as amended September 24, 2007, January 24, 2009, July 1, 2010 and March 21, 2012 (incorporated by reference to Exhibit 10.21 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.21 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. COMMERCIAL SUPPLY AGREEMENT between SAVIENT PHARMACEUTICALS INC. and BIO-TECHNOLOGY GENERAL (ISRAEL) LTD. COMME

February 24, 2021 EX-10.68

Executive Employment Agreement, effective as of October 30, 2020, by and among Horizon Therapeutics Public Limited Company, Horizon Therapeutics USA, Inc. and Karin Rosén, M.D., Ph.D.

Exhibit 10.68 EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON THERPEUTICS PLC AND HORIZON THERAPEUTICS USA, INC. AND KARIN ROSEN This Executive Employment Agreement (hereinafter referred to as the ?Agreement?), is entered into by and between Horizon Therapeutics PLC., an Irish Public Limited Company, and its wholly owned subsidiary, Horizon Therapeutics USA, Inc., a Delaware corporation, eac

February 24, 2021 EX-10.72

Assignment and Amendment of Development and Manufacturing Services Agreement, dated February 14, 2018, by and between AGC Biologics A/S (formerly known as CMC Biologics A/S) and Horizon Therapeutics Ireland DAC (as successor in interest to River Vision Development Corp) (incorporated by reference to Exhibit 10.72 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.72 ASSIGNMENT AND AMENDMENT OF AGREEMENT This Assignment of Agreement (the ?Assignment?) is entered into on 14 day of February 2018 by and between River Vision Development Corporation, now known as Horizon Pharma Tepro, Inc., and having its principal place of business at 150 South Saunders Road, Lake Forest, IL 60045 (?River Vision?), and CMC Biologics A/S, dba AGC Bilogics, a duly inco

February 24, 2021 EX-10.23

Asset Purchase Agreement, dated March 22, 2012, by and between Horizon Therapeutics, LLC (as successor in interest to Hyperion Therapeutics, Inc.) and Bausch Health Companies Inc. (formerly Ucyclyd Pharma, Inc.).

Exhibit 10.23 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. EXECUTION COPY ASSET PURCHASE AGREEMENT between UCYCLYD PHARMA, INC., and HYPERION THERAPEUTICS, INC. dated as

February 24, 2021 EX-10.69

Amended and Restated Executive Employment Agreement, effective as of July 27, 2010, as amended, by and between Horizon Therapeutics USA, Inc. and Jeffrey W. Sherman, M.D. (incorporated by reference to Exhibit 10.69 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 24, 2021).

Exhibit 10.69 AMENDED AND RESTATED EXECUTIVE EMPLOYMENT AGREEMENT BY AND BETWEEN HORIZON PHARMA, INC., HORIZON PHARMA USA, INC. AND JEFFREY W. SHERMAN, M.D. This Amended and Restated Employment Agreement (hereinafter referred to as the ?Agreement?), dated July 27, 2010, is entered into effective July 27, 2010 (the ?Effective Date?) by and between Horizon Pharma, Inc., a Delaware corporation, and i

February 24, 2021 SC TO-T/A

- SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 (Amendment No. 1) Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect wholly owned subsidiary of Horizon Therapeuti

February 24, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of i

February 12, 2021 EX-99.(D)(4)

Letter Agreement, dated as of November 20, 2020, by and between Ultimate Parent and Viela

Exhibit (d)(4) CONFIDENTIAL November 20, 2020 Tim Walbert Horizon Therapeutics plc Chairman, President and Chief Executive Officer CONNAUGHT House, 1st Floor 1 Burlington Road, Dublin 4, D04 C5Y6 Ireland Ladies and Gentlemen: Thank you again for your most recent letter of November 16, 2020 updating the non-binding proposal of Horizon Therapeutics plc (?Horizon?) to acquire 100% of the fully-diluted securities of Viela Bio, Inc.

February 12, 2021 EX-99.(A)(1)(V)

Form of Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees

Exhibit (a)(1)(v) Offer To Purchase For Cash All Outstanding Shares of Common Stock of VIELA BIO, INC.

February 12, 2021 EX-99.(A)(1)(IV)

Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees

Exhibit (a)(1)(iv) Offer To Purchase For Cash All Outstanding Shares of Common Stock of VIELA BIO, INC.

February 12, 2021 SC TO-T

- SC TO-T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. A direct wholly owned subsidiary of Horizon Therapeutics USA, Inc. An indirect wholly owned subsidiary of Horizon Therapeutics Public Limited

February 12, 2021 EX-99.(A)(1)(I)

Offer to Purchase, dated as of February 12, 2021

Table of Contents Exhibit (a)(1)(i) Offer to Purchase for Cash All Outstanding Shares of Common Stock of Viela Bio, Inc.

February 12, 2021 EX-99.(A)(1)(II)

Form of Letter of Transmittal (including Internal Revenue Service Form W-9)

Exhibit (a)(1)(ii) LETTER OF TRANSMITTAL To Tender Shares of Common Stock of VIELA BIO, INC.

February 12, 2021 EX-99.(B)(2)

Amended and Restated Commitment Letter, dated February 11, 2021, by and among Parent, Morgan Stanley Senior Funding, Inc., Citigroup Global Markets, Inc. and JPMorgan Chase Bank, N.A.

Exhibit (b)(2) CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM IF PUBLICLY DISCLOSED.

February 12, 2021 EX-99.(D)(3)

Mutual Nondisclosure Agreement, dated as of July 15, 2020, by and between Ultimate Parent and Viela

Exhibit (d)(3) MUTUAL NONDISCLOSURE AGREEMENT THIS MUTUAL NONDISCLOSURE AGREEMENT (the ?Agreement?), is made effective as of July 15, 2020 (the ?Effective Date?) by and between HORIZON THERAPEUTICS PLC (?Horizon?), an Irish company, with its principal place of business located at Connaught House, 1st Floor, 1 Burlington Road, Dublin D04 C5Y6, Ireland and VIELA BIO, INC.

February 12, 2021 EX-99.(A)(1)(VI)

Summary Advertisement, as published in The New York Times on February 12, 2021

Exhibit (a)(1)(vi) This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below).

February 12, 2021 EX-99.(A)(1)(III)

Form of Notice of Guaranteed Delivery

Exhibit (a)(1)(iii) NOTICE OF GUARANTEED DELIVERY For Tender of All Outstanding Shares of Common Stock of VIELA BIO, INC.

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Horizon Therapeutics plc Title of Class of Securities: Common Stock CUSIP Number: G46188101 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

February 4, 2021 SC TO-C

- SC TO-C

SC TO-C UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. an indirect wholly owned subsidiary of Horizon Therapeutics Public Limited Company (Name of Filing Persons (Offerors)) Common Stock, $

February 4, 2021 EX-99.(A)(5)(D)

Horizon FAQs, dated February 4, 2021 (incorporated by reference to the Tender Offer Statement on Schedule TO-C filed by Ultimate Parent on February 4, 2021)

EX-99.(a)(5)(D) Exhibit (a)(5)(D) FAQs Is this public? Am I allowed to share the information with others? The deal has been announced publicly but has not yet closed. Please do not share anything beyond what has already been made public. Will there be layoffs? One of the goals of this transaction is to fuel growth, and we do not anticipate significant layoffs. In fact, there will be additional hir

February 1, 2021 EX-2.1

Agreement and Plan of Merger, dated January 31, 2021, by and among Horizon Therapeutics USA, Inc., Teiripic Merger Sub, Inc., Viela Bio, Inc. and solely for purposes of Sections 6.7 and 9.12 of the Merger Agreement, Horizon Therapeutics plc.

EX-2.1 Exhibit 2.1 CONFIDENTIAL Execution Version AGREEMENT AND PLAN OF MERGER among: VIELA BIO, INC., a Delaware corporation; HORIZON THERAPEUTICS USA, INC., a Delaware corporation; TEIRIPIC MERGER SUB, INC., a Delaware corporation; and solely for purposes of Sections 6.7 and 9.12 HORIZON THERAPEUTICS PLC, a public limited company organized under the laws of Ireland. Dated as of January 31, 2021

February 1, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other Jurisdiction of In

February 1, 2021 EX-99.(A)(5)(C)

Email to Horizon employees, dated February 1, 2021 (incorporated by reference to the Tender Offer Statement on Schedule TO-C filed by Ultimate Parent on February 1, 2021)

EX-99.(A)(5)(C) 3 d49773dex99a5c.htm EX-99.(A)(5)(C) Exhibit (a)(5)(c) Subject: Horizon to Acquire Viela Bio, Inc. Hi everyone, I am pleased to share that today we take a significant step in advancing our strategy to expand our pipeline with the acquisition of Viela Bio, Inc., a biotechnology company based in Gaithersburg, Maryland, focused on the discovery, development and commercialization of tr

February 1, 2021 SC TO-C

- SC TO-C

SC TO-C UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Under Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Viela Bio, Inc. (Name of Subject Company (Issuer)) Teiripic Merger Sub, Inc. an indirect wholly owned subsidiary of Horizon Therapeutics Public Limited Company (Name of Filing Persons (Offerors)) Common Stock, $

February 1, 2021 SC TO-C

- SC TO-C

SC TO-C UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other Jurisdicti

February 1, 2021 EX-99.4

Investor Presentation, dated February 1, 2021.

EX-99.4 Horizon Acquisition of Viela Bio February 1, 2021 Exhibit 99.4 Agenda Review of Viela Pipeline Financial Overview and Transaction Details Overview and Strategic Rationale Q&A Tim Walbert Chairman, President and Chief Executive Officer Karin Rosén, M.D., Ph.D. Executive Vice President, R&D and Chief Scientific Officer Paul Hoelscher Executive Vice President, Chief Financial Officer Tim Walb

February 1, 2021 EX-99.4

Agenda Review of Viela Pipeline Financial Overview and Transaction Details Overview and Strategic Rationale Q&A Tim Walbert Chairman, President and Chief Executive Officer Karin Rosén, M.D., Ph.D. Executive Vice President, R&D and Chief Scientific Of

EX-99.4 Horizon Acquisition of Viela Bio February 1, 2021 Exhibit 99.4 Agenda Review of Viela Pipeline Financial Overview and Transaction Details Overview and Strategic Rationale Q&A Tim Walbert Chairman, President and Chief Executive Officer Karin Rosén, M.D., Ph.D. Executive Vice President, R&D and Chief Scientific Officer Paul Hoelscher Executive Vice President, Chief Financial Officer Tim Walb

February 1, 2021 EX-2.1

Agreement and Plan of Merger, dated January 31, 2021, by and among Horizon Therapeutics USA, Inc., Teiripic Merger Sub, Inc., Viela Bio, Inc. and solely for purposes of Sections 6.7 and 9.12 of the Merger Agreement, Horizon Therapeutics plc (incorporated by reference to Exhibit 2.1 to Horizon Therapeutics Public Limited Company’s Current Report on Form 8-K, filed on February 1, 2021).

EX-2.1 Exhibit 2.1 CONFIDENTIAL Execution Version AGREEMENT AND PLAN OF MERGER among: VIELA BIO, INC., a Delaware corporation; HORIZON THERAPEUTICS USA, INC., a Delaware corporation; TEIRIPIC MERGER SUB, INC., a Delaware corporation; and solely for purposes of Sections 6.7 and 9.12 HORIZON THERAPEUTICS PLC, a public limited company organized under the laws of Ireland. Dated as of January 31, 2021

February 1, 2021 EX-99.(A)(5)(B)

Email to Viela employees, dated February 1, 2021 (incorporated by reference to the Tender Offer Statement on Schedule TO-C filed by Ultimate Parent on February 1, 2021)

EX-99.(a)(5)(B) Exhibit (a)(5)(B) Hello everyone, Thank you for allowing me time to join your town hall this morning. It was great to be able to talk with you live, even if remotely. I wanted to follow up with an email to welcome you to the Horizon family. I say family because that’s what I consider the more than 1,400 employees who make up our company – and now, all of you. I wanted to share a li

February 1, 2021 EX-99.1

Horizon Therapeutics plc to Acquire Viela Bio, Inc. to Significantly Expand Development Pipeline and Grow Rare Disease Medicine Portfolio - Conference Call Today at 8 a.m. EST to Discuss Transaction - - Provides TEPEZZA® (teprotumumab-trbw) Supply Up

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc to Acquire Viela Bio, Inc. to Significantly Expand Development Pipeline and Grow Rare Disease Medicine Portfolio - Conference Call Today at 8 a.m. EST to Discuss Transaction - - Provides TEPEZZA® (teprotumumab-trbw) Supply Update; Submitted Prior Approval Supplement to FDA to Support Increased Scale Production of TEPEZZA - DUBLIN and GAITHERSBURG, Md.

February 1, 2021 EX-99.2

TENDER AND SUPPORT AGREEMENT

EX-99.2 Exhibit 99.2 TENDER AND SUPPORT AGREEMENT THIS TENDER AND SUPPORT AGREEMENT (this “Agreement”) is entered into as of [•], 2021, by and among Horizon Therapeutics USA, Inc., a Delaware corporation (“Parent”), Teiripic Merger Sub, Inc., a Delaware corporation and a direct wholly-owned subsidiary of Parent (“Purchaser”), and [ ] (“Stockholder”). RECITALS A. Stockholder is a holder of record a

February 1, 2021 EX-99.2

Form of Tender and Support Agreement.

EX-99.2 Exhibit 99.2 TENDER AND SUPPORT AGREEMENT THIS TENDER AND SUPPORT AGREEMENT (this “Agreement”) is entered into as of [•], 2021, by and among Horizon Therapeutics USA, Inc., a Delaware corporation (“Parent”), Teiripic Merger Sub, Inc., a Delaware corporation and a direct wholly-owned subsidiary of Parent (“Purchaser”), and [ ] (“Stockholder”). RECITALS A. Stockholder is a holder of record a

February 1, 2021 EX-99.3

Debt Commitment Letter, dated January 31, 2021, by and among Horizon Therapeutics USA, Inc., a Delaware corporation, Morgan Stanley Senior Funding, Inc. and Citigroup Global Markets, Inc.

EX-99.3 Exhibit 99.3 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM IF PUBLICLY DISCLOSED. CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013 MORGAN STANLEY SENIOR FUNDING, INC. 1585 Broadway New York, New York 10036 CONFIDENTIAL January 31, 2021

February 1, 2021 EX-99.3

CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013

EX-99.3 Exhibit 99.3 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM IF PUBLICLY DISCLOSED. CITIGROUP GLOBAL MARKETS INC. 390 Greenwich Street New York, New York 10013 MORGAN STANLEY SENIOR FUNDING, INC. 1585 Broadway New York, New York 10036 CONFIDENTIAL January 31, 2021

February 1, 2021 EX-99.1

Press Release, dated February 1, 2021.

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc to Acquire Viela Bio, Inc. to Significantly Expand Development Pipeline and Grow Rare Disease Medicine Portfolio - Conference Call Today at 8 a.m. EST to Discuss Transaction - - Provides TEPEZZA® (teprotumumab-trbw) Supply Update; Submitted Prior Approval Supplement to FDA to Support Increased Scale Production of TEPEZZA - DUBLIN and GAITHERSBURG, Md.

January 11, 2021 EX-99.1

Horizon Therapeutics plc Provides Preliminary 2020 Financial Results, Exceeding Full-Year 2020 Net Sales and Adjusted EBITDA Guidance; Provides Update on TEPEZZA® (teprotumumab-trbw) Supply and New KRYSTEXXA® (pegloticase injection) Trials – Company

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Provides Preliminary 2020 Financial Results, Exceeding Full-Year 2020 Net Sales and Adjusted EBITDA Guidance; Provides Update on TEPEZZA® (teprotumumab-trbw) Supply and New KRYSTEXXA® (pegloticase injection) Trials – Company to present at 39th Annual J.P. Morgan Healthcare Conference on Tuesday, Jan. 12, 2021 at 11:40 a.m. ET – DUBLIN – Jan. 11, 2021 –

January 11, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 11, 2021 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

December 23, 2020 8-K

Regulation FD Disclosure - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 22, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of i

December 17, 2020 8-K

Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 17, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of i

November 2, 2020 EX-99.1

Horizon Therapeutics plc Reports Record Third-Quarter 2020 Results; Increases TEPEZZA® Full-Year Net Sales Guidance to Greater Than $800 Million; Increases Full-Year 2020 Net Sales and Adjusted EBITDA Guidance — Record Third-Quarter 2020 Net Sales of

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Record Third-Quarter 2020 Results; Increases TEPEZZA® Full-Year Net Sales Guidance to Greater Than $800 Million; Increases Full-Year 2020 Net Sales and Adjusted EBITDA Guidance — Record Third-Quarter 2020 Net Sales of $636.4 Million Increased 90 Percent; Third-Quarter 2020 GAAP Net Income of $292.8 Million; Adjusted EBITDA of $329.8 Million — —

November 2, 2020 EX-10.1

Amendment No. 3 to Commercial Supply Agreement, dated July 30, 2020, by and between AGC Biologics A/S (formerly known as CMC Biologics A/S) and Horizon Therapeutics Ireland DAC (incorporated by reference to Exhibit 10.1 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on November 2, 2020).

EX-101 Exhibit 10.1 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. CONFIDENTIAL AMENDMENT NO. 3 TO COMMERCIAL SUPPLY AGREEMENT This Amendment No. 3 (the “Amendment”) to the

November 2, 2020 EX-10.2

Development and Manufacturing Services Agreement, dated June 10, 2015, by and between AGC Biologics A/S (formerly known as CMC Biologics A/S) and Horizon Therapeutics Ireland DAC (as successor in interest to River Vision Development Corp) (incorporated by reference to Exhibit 10.2 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on November 2, 2020).

EX-10.2 Exhibit 10.2 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. CONFIDENTIAL DEVELOPMENT AND MANUFACTURING SERVICES AGREEMENT This agreement is made as of June 10, 2015

November 2, 2020 10-Q

Quarterly Report - 10-Q

nte UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HO

November 2, 2020 EX-10.4

API Supply Agreement, dated November 3, 2010, by and between Cambrex Profarmaco Milano and Horizon Therapeutics Ireland DAC (as successor in interest to Raptor Therapeutics Inc. and Raptor Pharmaceuticals Europe B.V.), as amended April 9, 2013 (incorporated by reference to Exhibit 10.4 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on November 2, 2020).

EX-10.4 Exhibit 10.4 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. EXECUTION COPY API SUPPLY AGREEMENT This API Supply Agreement (“Agreement”) is made as of the 3rd day of

November 2, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

November 2, 2020 EX-10.3

Incremental Amendment and Lender Joinder Agreement, dated August 17, 2020, by and among JP Morgan Chase Bank, N.A., as an incremental revolving lender and as an issuing bank, Horizon Therapeutics USA, Inc. and Citibank, N.A., as administrative agent (incorporated by reference to Exhibit 10.3 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on November 2, 2020).

EX-10.3 Exhibit 10.3 Execution Version INCREMENTAL AMENDMENT This INCREMENTAL AMENDMENT AND LENDER JOINDER AGREEMENT (this “Agreement”), dated as of August 17, 2020, is entered into by and among JPMORGAN CHASE BANK, N.A., as an Incremental Revolving Lender and as an Issuing Bank (in such capacities, the “New Lender”), HORIZON THERAPEUTICS USA, INC., a Delaware corporation (the “Borrower”), and CIT

August 10, 2020 424B5

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered(1) Proposed Maximum Offering Price per Security Proposed Maximum Aggregate Offering Price Amount of Registration Fee(2) Ordinary shares, nomina

424B5 1 d73474d424b5.htm 424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-230054 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered(1) Proposed Maximum Offering Price per Security Proposed Maximum Aggregate Offering Price Amount of Registration Fee(2) Ordinary shares, nominal value $0.0001 per share 13,570,000 $71

August 10, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

August 10, 2020 EX-1.1

Underwriting Agreement, dated August 6, 2020, by and among Horizon Therapeutics Public Limited Company and the several underwriters named therein.

EX-1.1 Exhibit 1.1 Execution Version HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 11,800,000 ORDINARY SHARES, NOMINAL VALUE $0.0001 PER SHARE UNDERWRITING AGREEMENT August 6, 2020 Citigroup Global Markets Inc. Morgan Stanley & Co. LLC J.P. Morgan Securities LLC Piper Sandler & Co. Stifel, Nicolaus & Company, Incorporated As Representatives of the Underwriters listed on Schedule I c/o Citigroup Glob

August 5, 2020 10-Q

Quarterly Report - 10-Q

nte UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZON

August 5, 2020 EX-10.1

Horizon Therapeutics Public Limited Company 2020 Equity Incentive Plan and Form of Option Agreement, Form of Stock Option Grant Notice, Forms of Restricted Stock Unit Agreement and Forms of Restricted Stock Unit Grant Notice thereunder.

EX-101 Exhibit 10.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans’ Available Reserve plus any Returning Shares will become available for issuance pursuant to Awards granted under

August 5, 2020 424B5

SUBJECT TO COMPLETION, DATED AUGUST 5, 2020

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-230054 The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has become effective by rule of the Securities and Exchange Commission. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell

August 5, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

August 5, 2020 EX-99.1

Horizon Therapeutics plc Reports Record Second-Quarter 2020 Results; Increases TEPEZZA® Full-Year Net Sales Guidance to Greater Than $650 Million; Increases Full-Year 2020 Net Sales and Adjusted EBITDA Guidance — Record Second-Quarter 2020 Net Sales

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Record Second-Quarter 2020 Results; Increases TEPEZZA® Full-Year Net Sales Guidance to Greater Than $650 Million; Increases Full-Year 2020 Net Sales and Adjusted EBITDA Guidance — Record Second-Quarter 2020 Net Sales of $462.8 Million Increased 44 Percent; Second-Quarter 2020 GAAP Net Loss of $80.0 Million; Adjusted EBITDA of $190.7 Million — —

June 23, 2020 8-K

Unregistered Sales of Equity Securities

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 18, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incor

June 3, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 3, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incorp

May 6, 2020 EX-4.6

Second Supplemental Indenture, dated April 23, 2020, by and among Horizon Properties Holding LLC, Curzion Pharmaceuticals, Inc. and U.S. Bank National Association (incorporated by reference to Exhibit 4.6 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on May 6, 2020).

EX-4.6 Exhibit 4.6 SECOND SUPPLEMENTAL INDENTURE SECOND SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of April 23, 2020, between HORIZON PROPERTIES HOLDING LLC and CURZION PHARMACEUTICALS, INC. (each, a “Guaranteeing Entity”), each a subsidiary of Horizon Therapeutics USA, Inc. (formerly known as Horizon Pharma USA, Inc.), a Delaware corporation (the “Issuer”), and U.S. Bank Nat

May 6, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of incorpo

May 6, 2020 10-Q

Quarterly Report - 10-Q

nte UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HORIZO

May 6, 2020 EX-4.5

First Supplemental Indenture, dated November 19, 2019, by and between HZNP Finance Limited and U.S. Bank National Association (incorporated by reference to Exhibit 4.5 to Horizon Therapeutics Public Limited Company’s Quarterly Report on Form 10-Q, filed on May 6, 2020).

EX-4.5 Exhibit 4.5 FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of November 19, 2019, between HZNP FINANCE LIMITED (the “Guaranteeing Entity”), a subsidiary of Horizon Therapeutics USA, Inc. (formerly known as Horizon Pharma USA, Inc.), a Delaware corporation (the “Issuer”), and U.S. Bank National Association, as trustee under the Indenture re

May 6, 2020 EX-99.1

Horizon Therapeutics plc Reports Strong First-Quarter 2020 Financial Results; Increasing TEPEZZA™ Full-Year 2020 Net Sales Guidance to Greater Than $200 Million Due to Rapid Uptake; Increasing Full-Year 2020 Net Sales Guidance — First-Quarter 2020 Ne

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Strong First-Quarter 2020 Financial Results; Increasing TEPEZZA™ Full-Year 2020 Net Sales Guidance to Greater Than $200 Million Due to Rapid Uptake; Increasing Full-Year 2020 Net Sales Guidance — First-Quarter 2020 Net Sales of $355.9 Million Increased 27 Percent; First-Quarter 2020 GAAP Net Loss of $13.6 Million; Adjusted EBITDA of $107.2 Mill

May 1, 2020 EX-99.2

HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2020 EMPLOYEE SHARE PURCHASE PLAN

EX-99.2 Exhibit 99.2 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2020 EMPLOYEE SHARE PURCHASE PLAN 1. GENERAL; PURPOSE. (a) The Plan provides a means by which Eligible Employees of the Company and certain designated Related Corporations may be given an opportunity to purchase Ordinary Shares. The Plan permits the Company to grant a series of Purchase Rights to Eligible Employees under an Employee

May 1, 2020 8-K

Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

May 1, 2020 EX-99.1

HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2020 EQUITY INCENTIVE PLAN

EX-99.1 Exhibit 99.1 HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY 2020 EQUITY INCENTIVE PLAN 1. GENERAL. (a) Relationship to Prior Plans. The Plan is the successor to the 2014 Plan. As of the Effective Date, (i) no additional awards may be granted under the 2014 Plan; (ii) the Prior Plans’ Available Reserve plus any Returning Shares will become available for issuance pursuant to Awards granted unde

May 1, 2020 S-8

- S-8

S-8 As filed with the Securities and Exchange Commission on May 1, 2020 Registration No.

May 1, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of inco

April 27, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-35238 (Com

April 2, 2020 8-K

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 2, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland (State or other jurisdiction of incorporation) 001-35238 (Comm

April 2, 2020 EX-99.1

Horizon Therapeutics plc Acquires Curzion Pharmaceuticals, Inc. and its LPAR1 Antagonist Product Candidate to Expand Development-Stage Pipeline -- Gained Rights to Product Candidate, CZN001 (renamed HZN-825), a Potential Treatment for Diffuse Cutaneo

EXHIBIT 99.1 Horizon Therapeutics plc Acquires Curzion Pharmaceuticals, Inc. and its LPAR1 Antagonist Product Candidate to Expand Development-Stage Pipeline - Gained Rights to Product Candidate, CZN001 (renamed HZN-825), a Potential Treatment for Diffuse Cutaneous Systemic Sclerosis; a Rare Rheumatic Disease with No FDA-Approved Treatment - - Compelling Fit with Horizon’s Strategy to Acquire and D

March 18, 2020 DEFA14A

HZNP / Horizon Pharma plc DEFA14A - - DEFA14A

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

March 18, 2020 DEF 14A

March 18, 2020

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 6, 2020 PRE 14A

HZNP / Horizon Pharma plc PRE 14A - - PRE 14A

PRE 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 26, 2020 EX-10.78

Amendment No. 2 to Commercial Supply Agreement, dated December 18, 2019, by and between AGC Biologics A/S (formerly known as CMC Biologics A/S) and Horizon Therapeutics Ireland DAC (incorporated by reference to Exhibit 10.78 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 26, 2020).

EX-10.78 Exhibit 10.78 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. AMENDMENT NO. 2 TO COMMERCIAL SUPPLY AGREEMENT This Amendment No. 2 (the “Second Amendment”) to the Co

February 26, 2020 EX-10.80

Amendment to Supply Agreement, effective as of November 30, 2018, by and between NOF Corporation and Horizon Therapeutics Ireland DAC (incorporated by reference to Exhibit 10.80 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 26, 2020).

EX-10.80 Exhibit 10.80 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. AMENDMENT TO THE SUPPLY AGREEMENT BETWEEN CREALTA Pharmaceuticals LLC AND NOF CORPORATION THIS AMENDME

February 26, 2020 EX-4.6

Description of securities registered under Section 12 of the Exchange Act of 1934 (incorporated by reference to Exhibit 4.6 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 26, 2020).

EX-4.6 Exhibit 4.6 DESCRIPTION OF SHARE CAPITAL The following description of the share capital of Horizon Therapeutics public limited company (the “Company”) is a summary. This summary does not purport to be complete and is qualified in its entirety by reference to the Irish Companies Act 2014 (as amended) (the “Companies Act”), and the complete text of the Company’s constitution, which is compris

February 26, 2020 EX-99.1

Horizon Therapeutics plc Reports Fourth-Quarter and Full-Year 2019 Financial Results; Announces Full-Year 2020 Guidance — Record Fourth-Quarter 2019 Net Sales of $363.5 Million Driven by 14 Percent Growth in the Orphan and Rheumatology Segment; Fourt

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Reports Fourth-Quarter and Full-Year 2019 Financial Results; Announces Full-Year 2020 Guidance — Record Fourth-Quarter 2019 Net Sales of $363.5 Million Driven by 14 Percent Growth in the Orphan and Rheumatology Segment; Fourth-Quarter 2019 GAAP Net Income of $592.8 Million; Adjusted EBITDA of $139.9 Million — — Record Full-Year 2019 Net Sales of $1.30

February 26, 2020 10-K

Annual Report - 10-K

octb inte s UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35238 HOR

February 26, 2020 EX-21.1

Subsidiaries of Horizon Therapeutics Public Limited Company.

Exhibit 21.1 Subsidiaries of Horizon Therapeutics Public Limited Company: NAME: JURISDICTION OF INCORPORATION: Andromeda Biotech Limited Israel Horizon Medicines LLC Delaware Horizon Ophthalmology, Inc Delaware Horizon Orphan Holdings LLC Delaware Horizon Orphan LLC Delaware Horizon Pharma Aon Limited Ireland Horizon Pharma Dó Limited Ireland Horizon Pharma Israel Holding Corp. Ltd Israel Horizon

February 26, 2020 EX-10.79

Amendment No. 2 to API Supply Agreement, effective as of January 17, 2018, by and between Cambrex Profarmaco Milano and Horizon Therapeutics Ireland DAC (incorporated by reference to Exhibit 10.79 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 26, 2020).

EX-10.79 Exhibit 10.79 Amendment No. 2 to Commercial Supply Agreement BETWEEN CAMBREX PROFARMACO MILANO, and HORIZON PHARMA IRELAND LIMITED Background: This Amendment No. 2 (“Amendment No. 2”) is made by and between Cambrex Profarmaco Milano Srl, Via E. Curiel, 34, 20067 Paullo (MI), Italy (“Cambrex”) and Horizon Pharma Ireland Limited with its registered office at Connaught House, 1st Floor, 1 Bu

February 26, 2020 EX-10.70

License Agreement, effective as of June 15, 2011, by and among F. Hoffmann-La Roche Ltd, Hoffman-La Roche Inc. and Horizon Therapeutics Ireland DAC (as successor in interest to River Vision Development Corp), as amended through Amendment No. 9 to the License Agreement, effective as of October 21, 2016 (incorporated by reference to Exhibit 10.70 to Horizon Therapeutics Public Limited Company’s Annual Report on Form 10-K, filed on February 26, 2020).

EX-10.70 Exhibit 10.70 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE HORIZON THERAPEUTICS PLC HAS DETERMINED THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM TO HORIZON THERAPEUTICS PLC IF PUBLICLY DISCLOSED. EXECUTION VERSION License Agreement by and among F. Hoffmann-La Roche Ltd, a Swiss corporation; Hoffma

February 26, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of i

February 26, 2020 EX-10.45

Separation Agreement, dated January 23, 2020, by and between Horizon Therapeutics USA, Inc. and Shao-Lee Lin, M.D., Ph.D.

EX-10.45 Exhibit 10.45 January 23, 2020 Shao Lee Lin, MD PhD 1111 Evergreen Dr. Lake Forest, IL 60045 Dear Shao-Lee: Pursuant to Section 4.1.3 of the Executive Employment Agreement, effective January 8, 2018, by and between Horizon Therapeutics Inc. (formerly known as Horizon Pharma, Inc.), Horizon Therapeutics USA, Inc. (formerly known as Horizon Pharma USA, Inc.) (collectively referred to as “Ho

February 12, 2020 SC 13G/A

HZNP / Horizon Pharma plc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4)* Name of issuer: Horizon Therapeutics Plc Title of Class of Securities: Common Stock CUSIP Number: G46188101 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

January 24, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 23, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

January 21, 2020 EX-99.1

FDA Approves TEPEZZATM (teprotumumab-trbw) for the Treatment of Thyroid Eye Disease (TED) — First and only FDA-approved medicine for TED, a serious, progressive, vision-threatening rare disease — — Clinical improvements were seen as early as six week

EX-99.1 Exhibit 99.1 FDA Approves TEPEZZATM (teprotumumab-trbw) for the Treatment of Thyroid Eye Disease (TED) — First and only FDA-approved medicine for TED, a serious, progressive, vision-threatening rare disease — — Clinical improvements were seen as early as six weeks, with continued improvement across the 24-week treatment period — — Approval comes ahead of the Prescription Drug User Fee Act

January 21, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 21, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

January 13, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 13, 2020 Horizon Therapeutics Public Limited Company (Exact name of registrant as specified in its charter) Ireland 001-35238 Not Applicable (State or other jurisdiction of in

January 13, 2020 EX-99.1

Horizon Therapeutics plc Increases Peak U.S. Annual Net Sales Expectations for Key Growth Drivers; Provides Update on Several Pipeline Programs — Increases KRYSTEXXA® (pegloticase injection) Peak U.S. Annual Net Sales Expectations to More Than $1 Bil

EX-99.1 Exhibit 99.1 Horizon Therapeutics plc Increases Peak U.S. Annual Net Sales Expectations for Key Growth Drivers; Provides Update on Several Pipeline Programs — Increases KRYSTEXXA® (pegloticase injection) Peak U.S. Annual Net Sales Expectations to More Than $1 Billion — — Increases Teprotumumab Peak U.S. Annual Net Sales Expectations to More Than $1 Billion — — Announces 79 Percent of Patie

January 13, 2020 EX-99.2

Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to expected financial performance and operating results in 2019 and future periods, including potential growth in net

EX-99.2 J.P. Morgan 38th Annual Healthcare Conference 2020 Chairman, President and Chief Executive Officer Timothy Walbert Exhibit 99.2 Forward-Looking Statements This presentation contains forward-looking statements, including, but not limited to, statements related to expected financial performance and operating results in 2019 and future periods, including potential growth in net sales of certa

January 10, 2020 SC 13G/A

HZNP / Horizon Pharma plc / SCOPIA CAPITAL MANAGEMENT LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

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