ABIO / ARCA biopharma, Inc. - تصريحات هيئة الأوراق المالية والبورصات، التقرير السنوي، بيان الوكيل

أركا بيوفارما، وشركة
US ˙ NasdaqCM ˙ US00211Y5069
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الإحصائيات الأساسية
LEI 529900TG7O4ESUDMGI54
CIK 907654
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 ARCA biopharma, Inc.
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.
August 11, 2025 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, 2025 ☐ TRANSITION REPORT PU

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, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES ACT OF 1934 For the transition period from to Commission file number: 000-22873 Oruka Therapeutics,

August 11, 2025 424B3

Oruka Therapeutics, Inc. 8,719,000 Shares of Common Stock Offered by the Selling Stockholders

Filed Pursuant to Rule 424(b)(3) Registration No. 333-283212 Prospectus Supplement No. 2 (to prospectus dated March 11, 2025) Oruka Therapeutics, Inc. 8,719,000 Shares of Common Stock Offered by the Selling Stockholders This prospectus supplement no. 2 is being filed to update and supplement information contained in the prospectus dated March 6, 2025 (the “Prospectus”), which forms a part of our r

July 1, 2025 EX-10.1

Offer Letter, dated July 1, 2025, between Oruka Therapeutics, Inc. and Laura Sandler.

Exhibit 10.1 July 1, 2025 Laura Sandler c/o Oruka Therapeutics, Inc. 855 Oak Grove Avenue, Suite 100 Menlo Park, CA 94025 Re: Amended and Restated Employment Letter Agreement Dear Laura: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am pleased to offer you the position of Chief Operating Officer (the “Role”) pursuant to this letter agreement (the “Agreement”). Your employment with the C

July 1, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): July 1, 2025 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

June 3, 2025 8-K

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): June 2, 2025 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in its Charter) Delaware 000-22873 36-3855489 (State or other jurisdiction of incorporation) (Commission F

May 14, 2025 424B3

Oruka Therapeutics, Inc. 8,719,000 Shares of Common Stock Offered by the Selling Stockholders

Filed Pursuant to Rule 424(b)(3) Registration No. 333-283212 Prospectus Supplement No. 1 (to prospectus dated March 11, 2025) Oruka Therapeutics, Inc. 8,719,000 Shares of Common Stock Offered by the Selling Stockholders This prospectus supplement no. 1 is being filed to update and supplement information contained in the prospectus dated March 6, 2025 (the “Prospectus”), which forms a part of our r

May 14, 2025 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, 2025 ☐ TRANSITION REPORT P

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, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES ACT OF 1934 For the transition period from to Commission file number: 000-22873 Oruka Therapeutics

May 14, 2025 EX-4.5

Paruka Warrant, dated December 31, 2024

Exhibit 4.5 ORUKA THERAPEUTICS, INC. WARRANT TO PURCHASE COMMON STOCK Number of Warrant Shares: 596,930 (subject to adjustment) Warrant No. ORKA-001 Original Issue Date: December 31, 2024 THIS WARRANT TO PURCHASE COMMON STOCK (the “Warrant”) certifies that, for value received, Paruka Holding LLC or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise an

April 18, 2025 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. )

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 14a-6(e)(2)) ☒ Defin

April 18, 2025 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. )

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 14a-6(e)(2)) ☐ Defin

March 6, 2025 EX-97.1

Incentive Compensation Clawback Policy

Exhibit 97.1 INCENTIVE COMPENSATION CLAWBACK POLICY August 29, 2024 I. Recoupment of Incentive-Based Compensation It is the policy of Oruka Therapeutics, Inc. (the “Company”) that, in the event the Company is required to prepare an accounting restatement of the Company’s financial statements due to material non-compliance with any financial reporting requirement under the federal securities laws (

March 6, 2025 EX-10.19

Form of Indemnification Agreement

Exhibit 10.19 INDEMNIFICATION AGREEMENT This Indemnification Agreement (this “Agreement”) is entered into as of by and between Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), and (the “Indemnitee”) and shall be deemed effective upon the earliest date that the Indemnitee is duly elected or appointed as a director or officer of the Company. RECITALS WHEREAS, the Board of Directors

March 6, 2025 S-8

As filed with the Securities and Exchange Commission on March 6, 2025

As filed with the Securities and Exchange Commission on March 6, 2025 Registration No.

March 6, 2025 EX-10.32

Cell Line License Agreement by and between WuXi Biologics Ireland Limited and Oruka Therapeutics, Inc., dated March 4, 2024

Exhibit 10.32 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. CELL LINE LICENSE AGREEMENT This Cell Line License Agreement (“Agreement”), effective as of March 4, 2024 (“EFFECTIVE DATE”), is entered and made by and between

March 6, 2025 EX-4.1

Description of Securities.

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED DESCRIPTION OF CAPITAL STOCK General The following description summarizes the material terms of the capital stock of Oruka Therapeutics, Inc. (“we,” “us,” “our” or the “Company”), as well as other material terms of certain provisions of the Delaware General Co

March 6, 2025 EX-19.1

Insider Trading Policy

Exhibit 19.1 INSIDER TRADING POLICY August 29, 2024 I. INTRODUCTION Federal and state laws prohibit buying, selling or making other transfers of securities by persons who have material information that is not generally known or available to the public. These laws also prohibit persons with such material nonpublic information (“MNPI”) from disclosing this information to others who trade. Trading wh

March 6, 2025 EX-10.29

IL-17 License Agreement by and between Paragon Therapeutics, Inc. and Oruka Therapeutics, Inc., dated February 4, 2025.

Exhibit 10.29 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. IL-17 LICENSE AGREEMENT This License Agreement (“Agreement”) is entered into and effective as of February 4, 2025 (the “Effective Date”), by and between Paragon

March 6, 2025 EX-FILING FEES

Filing Fee Table.

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) Oruka Therapeutics, Inc. (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 Offering Price Fee Rate Amount of Registration Fee Equity Common stock, $0.001

March 6, 2025 EX-21.1

List of Subsidiaries of Oruka Therapeutics, Inc (incorporated by reference to Exhibit 21.1 to the Registrant’s Annual Report on Form 10-K filed with the SEC on March 6, 2025).

Exhibit 21.1 Subsidiaries of Oruka Therapeutics, Inc. Name of Subsidiary State or Jurisdiction in Which Incorporated or Organized Oruka Therapeutics Operating Company, LLC Delaware Oruka Therapeutics Australia Pty Ltd. Australia

March 6, 2025 EX-10.33

Amendment No. 1 to the Cell Line License Agreement by and between WuXi Biologics Ireland Limited and Oruka Therapeutics, Inc., dated November 20, 2024

Exhibit 10.33 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. AMENDMENT NO. 1 TO THE CELL LICENSE AGREEMENT THIS AMENDMENT NO. 1 TO THE CELL LINE LICENSE AGREEMENT (“Amendment”), effective as of November 20, 2024 (the “Ame

March 6, 2025 EX-10.18

Amended and Restated Employment Letter Agreement by and between Oruka Therapeutics, Inc. and Joana Goncalves, dated October 1, 2024

Exhibit 10.18 October 1, 2024 Joana Goncalves c/o Oruka Therapeutics, Inc. 855 Oak Grove Avenue, Suite 100 Menlo Park, CA 94025 Re: Amended and Restated Employment Letter Agreement Dear Jo: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am pleased to offer you a continuing position as Chief Medical Officer (the “Role”) pursuant to this letter agreement (the “Agreement”). Your Role commen

March 6, 2025 EX-10.31

IL-23 License Agreement by and between Paragon Therapeutics, Inc. and Oruka Therapeutics, Inc., dated December 17, 2024

Exhibit 10.31 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. IL-23 LICENSE AGREEMENT This License Agreement (“Agreement”) is entered into and effective as of December 17, 2024 (the “Effective Date”), by and between Parago

March 6, 2025 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, 2024 ☐ TRANSITION REPORT PURSUA

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, 2024 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 000-22873 Oruka Therapeut

March 6, 2025 EX-10.17

Amended and Restated Employment Letter Agreement by and between Oruka Therapeutics, Inc. and Paul Quinlan, dated October 1, 2024

Exhibit 10.17 October 1, 2024 Paul Quinlan c/o Oruka Therapeutics, Inc. 855 Oak Grove Avenue, Suite 100 Menlo Park, CA 94025 Re: Amended and Restated Employment Letter Agreement Dear Paul: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am pleased to offer you a continuing position as General Counsel (the “Role”) pursuant to this letter agreement (the “Agreement”). Your Role commenced on

March 6, 2025 POS AM

As filed with the Securities and Exchange Commission on March 6, 2025

As filed with the Securities and Exchange Commission on March 6, 2025 Registration No.

March 6, 2025 EX-4.3

Form of Pre-Funded Warrant, dated August 29, 2024.

Exhibit 4.3 THE OFFER AND SALE OF THESE SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR ANY APPLICABLE STATE SECURITIES LAWS. THE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF (I) IN THE ABSENCE OF (A) AN EFFECTIVE REGISTRATION STA

March 6, 2025 EX-10.20

Non-Employee Directors Compensation Program

Exhibit 10.20 Oruka Therapeutics, Inc. Non-Employee Directors Compensation Program Each of our non-employee directors receives compensation pursuant to the non-employee director cash and equity compensation program adopted by our Board. This program provides for the following annual cash retainers: Annual Cash Retainer $ 40,000 Annual Board Chair Retainer $ 30,000 Audit Committee Retainers: Chair

February 5, 2025 8-K

Entry into a Material Definitive Agreement

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 4, 2025 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commissi

December 19, 2024 8-K

Entry into a Material Definitive Agreement

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, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commiss

November 22, 2024 CORRESP

November 22, 2024

November 22, 2024 VIA EDGAR AND EMAIL United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

November 21, 2024 SC 13D/A

ORKA / Oruka Therapeutics, Inc. / Fairmount Funds Management LLC - AMENDMENT NO. 2 TO SCHEDULE 13D Activist Investment

SC 13D/A 1 ea0222167-13da2fairoruka.htm AMENDMENT NO. 2 TO SCHEDULE 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2) ORUKA THERAPEUTICS, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 687604108 (CUSIP Number) Ms. Erin O’Connor Fairmount Funds Management LLC 200 B

November 18, 2024 8-K

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): November 14, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in its Charter) Delaware 000-22873 36-3855489 (State or other jurisdiction of incorporation) (Commiss

November 14, 2024 EX-99.1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 99.1 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the Board of Directors and Stockholders of Oruka Therapeutics, Inc. Opinion on the Financial Statement — Balance Sheet We have audited the accompanying balance sheet of Oruka Therapeutics, Inc. (the “Company”) as of February 6, 2024, including the related notes (collectively referred to as the “financial statement”). In our op

November 14, 2024 EX-99.2

Form of Grant Notice for Nonqualified Stock Option and Standard Terms and Conditions for Stock Options (Directors)

Exhibit 99.2 Director FORM ORUKA THERAPEUTICS, INC. 2024 stock INCENTIVE PLAN GRANT NOTICE FOR Nonqualified STOCK OPTIONS FOR GOOD AND VALUABLE CONSIDERATION, Oruka Therapeutics, Inc. (the “Company”), hereby grants to Participant named below a Nonqualified Stock Option (the “Option”) to purchase any part or all of the number of shares of Common Stock that are covered by this Option at the Exercise

November 14, 2024 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): November 14, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in its Charter) Delaware 000-22873 36-3855489 (State or other jurisdiction of incorporation) (Commiss

November 14, 2024 S-8

As filed with the Securities and Exchange Commission on November 14, 2024

As filed with the Securities and Exchange Commission on November 14, 2024 Registration No.

November 14, 2024 S-1

As filed with the Securities and Exchange Commission on November 14, 2024

As filed with the Securities and Exchange Commission on November 14, 2024 Registration No.

November 14, 2024 SC 13G/A

ORKA / Oruka Therapeutics, Inc. / Avidity Partners Management LP Passive Investment

SC 13G/A 1 d1153039313g-a.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Oruka Therapeutics, Inc.1 (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 687604108 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the a

November 14, 2024 SC 13G/A

ORKA / Oruka Therapeutics, Inc. / Venrock Healthcare Capital Partners III, L.P. - SC 13G/A Passive Investment

SC 13G/A 1 tm2428137d13sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Oruka Therapeutics, Inc. (Name of Issuer) Common stock, $0.001 par value per share (Title of Class of Securities) 687604108 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statem

November 14, 2024 EX-99.3

Form of Grant Notice for Stock Option and Standard Terms and Conditions for Stock Options (Employees)

Exhibit 99.3 EMPLOYEE FORM ORUKA THERAPEUTICS, INC. 2024 stock INCENTIVE PLAN GRANT NOTICE FOR STOCK OPTIONS FOR GOOD AND VALUABLE CONSIDERATION, Oruka Therapeutics, Inc. (the “Company”), hereby grants to Participant named below an option (the “Option”) to purchase any part or all of the number of shares of Common Stock that are covered by this Option at the Exercise Price per share, each specifie

November 14, 2024 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables FORM S-1 (Form Type) Oruka Therapeutics, Inc.

November 14, 2024 SC 13G/A

ORKA / Oruka Therapeutics, Inc. / Allostery Investments LP Passive Investment

SC 13G/A 1 oruka13ga1-11142024.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Oruka Therapeutics, Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 687604108 (CUSIP Number) September 30, 2024 (Date of Event which Requires Filing of this Statement) Chec

November 14, 2024 EX-FILING FEES

Filing Fee Table.

Exhibit 107.1 Calculation of Filing Fee Tables Form S-8 (Form Type) Oruka Therapeutics, Inc. (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 Offering Price Fee Rate Amount of Registration Fee Equity Common stock, $0.001

November 13, 2024 EX-10.4

Form of Registration Rights Agreement, dated as of August 29, 2024.

Exhibit 10.4 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this “Agreement”) is made and entered into as of August 29, 2024, among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), ARCA biopharma, Inc. (“Parent”), a Delaware corporation, and each of the several purchasers signatory hereto (each such purchaser, a “Purchaser” and, collectively, the “Purchasers”).

November 13, 2024 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, 2024 ☐ TRANSITION REPO

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, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES ACT OF 1934 For the transition period from to Commission file number: 000-22873 Oruka Therapeu

October 22, 2024 SC 13D/A

ORKA / Oruka Therapeutics, Inc. / Adage Capital Management, L.P. Activist Investment

SC 13D/A 1 p24-3033sc13da.htm SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Oruka Therapeutics, Inc. (formerly known as ARCA biopharma, Inc.) (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 687604108 (CUSIP Number) Robert Atchinson Adage Capital Partners GP, L.L.C. 200

October 18, 2024 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 Rul

October 7, 2024 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

October 4, 2024 EX-10.2

Amended and Restated Employment Letter Agreement by and between the Company and Arjun Agarwal, dated as of October 3, 2024 (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed with the SEC on October 4, 2024, File No. 241354944).

Exhibit 10.2 October 3, 2024 Arjun Agarwal c/o Oruka Therapeutics, Inc. 855 Oak Grove Avenue, Suite 100 Menlo Park, CA 94025 Re: Amended and Restated Employment Letter Agreement Dear Arjun: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am pleased to offer you a continuing position as Senior Vice President, Finance (the “Role”) pursuant to this letter agreement (the “Agreement”). Your Ro

October 4, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): October 3, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commissio

October 4, 2024 EX-10.1

Amended and Restated Employment Offer Letter by and between Oruka Therapeutics, Inc. and Lawrence Klein, dated as of October 3, 2024 (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed with the SEC on October 4, 2024, File No. 241354944).

Exhibit 10.1 October 3, 2024 Lawrence Klein c/o Oruka Therapeutics, Inc. 855 Oak Grove Avenue, Suite 100 Menlo Park, CA 94025 Re: Amended and Restated Employment Letter Agreement Dear Lawrence: On behalf of the Board of Directors (the “Board”) of Oruka Therapeutics, Inc. (the “Company”), I am pleased to offer you a continuing position as Chief Executive Officer of the Company (“CEO”) and as a memb

September 13, 2024 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, 2024 Oruka 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): September 11, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in its Charter) Delaware 000-22873 36-3855489 (State or other jurisdiction of incorporation) (Commis

September 13, 2024 EX-3.1

Certificate of Designation of Preferences, Rights and Limitations of Series A Non-Voting Convertible Preferred Stock.

Exhibit 3.1 Oruka Therapeutics, Inc. CERTIFICATE OF DESIGNATION OF PREFERENCES, RIGHTS AND LIMITATIONS OF SERIES A NON-VOTING CONVERTIBLE PREFERRED STOCK Pursuant to Section 151 of the General Corporation Law of the State of Delaware THE UNDERSIGNED DOES HEREBY CERTIFY, on behalf of Oruka Therapeutics, Inc., a Delaware corporation (the “Corporation”), that the following resolution was duly adopted

September 13, 2024 SC 13D/A

ABIO / ARCA biopharma, Inc. / Fairmount Funds Management LLC - AMENDMENT NO. 1 TO SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1) ORUKA THERAPEUTICS, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 687604108 (CUSIP Number) Ms. Erin O’Connor Fairmount Funds Management LLC 200 Barr Harbor Drive, Suite 400 West Conshohocken, PA 19428 (267) 262-5300 (

September 13, 2024 EX-99.1

Oruka Therapeutics Announces $200 Million Private Placement

Exhibit 99.1 Oruka Therapeutics Announces $200 Million Private Placement MENLO PARK, Calif., September 12, 2024 (GLOBE NEWSWIRE) - Oruka Therapeutics, Inc. (“Oruka” or the “Company”) (Nasdaq: ORKA), a biotechnology company developing novel biologics designed to set a new standard for the treatment of chronic skin diseases, including plaque psoriasis, today announced that it has entered into a secu

September 13, 2024 EX-10.2

Form of Registration Rights Agreement, dated as of September 13, 2024 (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed with the SEC on September 13, 2024).

Exhibit 10.2 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of September 13, 2024, is entered into by and among Oruka Therapeutics Inc., a Delaware corporation (the “Company”), and the several investors signatory hereto (individually as an “Investor” and collectively together with their respective permitted assigns, the “Investors”). Capitalized terms

September 13, 2024 EX-4.1

Form of Pre-Funded Warrant, dated September 13, 2024.

Exhibit 4.1 FORM OF PRE-FUNDED WARRANT TO PURCHASE COMMON STOCK Number of Shares: [●] (subject to adjustment) Warrant No. [●] Original Issue Date: September 13, 2024 Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [●] or its registered assigns (the “Holder”),

September 13, 2024 EX-99.2

Oruka Therapeutics Announces Accelerated Clinical Timelines and Upcoming Presentation at EADV Supporting ORKA-001’s Profile as a Potentially Best-in-Class Half-Life Extended Antibody Targeting IL-23p19 ORKA-001, a novel half-life extended IL-23p19 mo

Exhibit 99.2 Oruka Therapeutics Announces Accelerated Clinical Timelines and Upcoming Presentation at EADV Supporting ORKA-001’s Profile as a Potentially Best-in-Class Half-Life Extended Antibody Targeting IL-23p19 ORKA-001, a novel half-life extended IL-23p19 monoclonal antibody (mAb), first-in-human dosing now expected first quarter 2025 ORKA-002, a novel half-life extended IL-17A/F mAb, first-i

September 13, 2024 EX-10.1

Securities Purchase Agreement, dated September 11, 2024, by and between Oruka Therapeutics, Inc. and each purchaser identified on Annex A thereto (incorporated by reference to Exhibit 10.1 the Registrant’s Current Report on Form 8-K filed with the SEC on September 13, 2024).

Exhibit 10.1 Certain identified information marked with [***] has been excluded from this exhibit because it is not material and is of the type that the registrant treats as private and confidential. SECURITIES PURCHASE AGREEMENT This SECURITIES PURCHASE AGREEMENT (this “Agreement”) is dated as of September 11, 2024, by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), an

September 6, 2024 SC 13D

ABIO / ARCA biopharma, Inc. / Fairmount Funds Management LLC - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. ) ORUKA THERAPEUTICS, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 687604108 (CUSIP Number) Ms. Erin O’Connor Fairmount Funds Management LLC 200 Barr Harbor Drive, Suite 400 West Conshohocken, PA 19428 (267) 262-5300 (N

September 6, 2024 EX-99.4

Form of Registration Rights Agreement, by and among the Company, Pre-Merger Oruka and certain purchasers.

EX-99.4 3 ea021374201ex99-4oruka.htm FORM OF REGISTRATION RIGHTS AGREEMENT, BY AND AMONG THE COMPANY, PRE-MERGER ORUKA AND CERTAIN PURCHASERS Exhibit 99.4 Final Form REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this “Agreement”) is made and entered into as of August 29, 2024, among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), ARCA biopharma, Inc. (“Parent”

September 6, 2024 EX-99.1

Joint Filing Agreement (incorporated by reference to Exhibit 99.1 of the Reporting Persons’ Schedule 13D filed with the SEC on September 6, 2024).

EX-99.1 2 ea021374201ex99-1oruka.htm JOINT FILING AGREEMENT Exhibit 99.1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including any and all amendments thereto) with respect to the Common Stock, $0.001 par value per share, of Oruka The

September 5, 2024 EX-3.1

Certificate of Amendment to Amended and Restated Certificate of Incorporation of the Company, effective August 29, 2024.

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ARCA BIOPHARMA, INC. ARCA biopharma, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the provisions of the General Corporation Law of the State of Delaware (the “General Corporation Law”), does hereby certify: 1. The current name of the Corporation is ARCA biopharm

September 5, 2024 EX-99.5

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.5 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION Defined terms included below shall have the same meaning as terms defined and included in the Company’s definitive proxy statement/prospectus filed with the U.S. Securities and Exchange Commission (the “SEC”) on July 22, 2024. On April 3, 2024, Oruka entered into a Merger Agreement with ARCA and the Merger Subs, pursuant to

September 5, 2024 EX-16.1

Letter from KPMG LLP, dated September 5, 2024 (incorporated by reference to Exhibit 16.1 to the Registrant’s Current Report on Form 8-K filed with the SEC on September 5, 2024).

Exhibit 16.1 September 5, 2024 Securities and Exchange Commission Washington, D.C. 20549 Ladies and Gentlemen: We were previously principal accountants for ARCA biopharma, Inc. and, under the date of February 1, 2024, we reported on the financial statements of ARCA biopharma, Inc. as of and for the years ended December 31, 2023 and 2022. On August 30, 2024, we were dismissed. We have read ARCA bio

September 5, 2024 EX-14.1

Code of Business Conduct and Ethics

Exhibit 14.1 Code of Business Conduct and Ethics (August 29, 2024) I. INTRODUCTION This Code of Business Conduct and Ethics (this “Code”) provides a general statement of the expectations of Oruka Therapeutics, Inc. (the “Company”) regarding the ethical standards to which each director, officer and employee should adhere while acting on behalf of the Company. You are expected to read and become fam

September 5, 2024 EX-10.10

Oruka Therapeutics, Inc. 2024 Stock Incentive Plan (incorporated by reference to Exhibit 10.10 of the Registrant’s Current Report on Form 8-K, filed with the Commission on September 5, 2024).

Exhibit 10.10 ORUKA THERAPEUTICS, INC. 2024 STOCK INCENTIVE PLAN 1. Purpose The purpose of this Oruka Therapeutics, Inc. 2024 Stock Incentive Plan (the “Plan”) is to promote and closely align the interests of employees, officers, non-employee directors and other individual service providers of Oruka Therapeutics, Inc. and its stockholders by providing stock-based compensation and other performance

September 5, 2024 EX-3.6

Amended and Restated Bylaws of the Company.

Exhibit 3.6 AMENDED AND RESTATED BYLAWS OF ORUKA THERAPEUTICS, INC. (a Delaware corporation) Article I CORPORATE OFFICES Section 1.1 Registered Office. The registered office of Oruka Therapeutics, Inc., a Delaware corporation (the “Corporation”), shall be fixed in the Certificate of Incorporation of the Corporation (as the same may be amended and/or restated from time to time, the “Certificate of

September 5, 2024 EX-3.8

Certificate of Elimination of Series A Convertible Preferred Stock, effective August 29, 2024.

Exhibit 3.8 CERTIFICATE OF ELIMINATION OF SERIES A CONVERTIBLE PREFERRED STOCK OF ARCA BIOPHARMA, INC. (Pursuant to Section 151(g) of the General Corporation Law of the State of Delaware) ARCA biopharma, Inc., a Delaware corporation (the “Company”), certifies as follows: 1. The Amended and Restated Certificate of Incorporation (the “Charter”) of the Company, including as amended pursuant to that c

September 5, 2024 EX-3.5

Second Amended and Restated Certificate of Incorporation of the Company, filed September 3, 2024.

Exhibit 3.5 SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ORUKA THERAPEUTICS, INC. Pursuant to Section 245 of the General Corporation Law of the State of Delaware (the “DGCL”), Oruka Therapeutics, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the provisions of the DGCL, hereby submits the following for the purpose of amending and restating its

September 5, 2024 EX-3.9

Certificate of Designation of Preferences, Rights and Limitations of Series B Non-Voting Convertible Preferred Stock.

Exhibit 3.9 Arca biopharma, Inc. CERTIFICATE OF DESIGNATION OF PREFERENCES, RIGHTS AND LIMITATIONS OF SERIES B NON-VOTING CONVERTIBLE PREFERRED STOCK Pursuant to Section 151 of the General Corporation Law of the State of Delaware THE UNDERSIGNED DOES HEREBY CERTIFY, on behalf of ARCA biopharma, Inc., a Delaware corporation (the “Corporation”), that the following resolution was duly adopted by the

September 5, 2024 EX-99.2

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 99.2 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the Board of Directors and Stockholders of Oruka Therapeutics, Inc. Opinion on the Financial Statement — Balance Sheet We have audited the accompanying balance sheet of Oruka Therapeutics, Inc. (the “Company”) as of February 6, 2024, including the related notes (collectively referred to as the “financial statement”). In our op

September 5, 2024 EX-99.3

Oruka Therapeutics, Inc. Unaudited Interim Condensed Consolidated Financial Statements INDEX TO UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Exhibit 99.3 Oruka Therapeutics, Inc. Unaudited Interim Condensed Consolidated Financial Statements INDEX TO UNAUDITED INTERIM CONDENSED CONSOLIDATED FINANCIAL STATEMENTS Unaudited Interim Condensed Consolidated Financial Statements: Condensed Consolidated Balance Sheets 1 Condensed Consolidated Statements of Operations and Comprehensive Loss 2 Condensed Consolidated Statements of Convertible Pref

September 5, 2024 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

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 29, 2024 Oruka Therapeutics, Inc. (Exact name of Registrant as Specified in its Charter) Delaware 000-22873 36-3855489 (State or other jurisdiction of incorporation) (Commissio

September 5, 2024 EX-10.16

Form of Employee Warrant Agreement

Exhibit 10.16 Employee Warrant Agreement Employee Warrant Purchaser: Purchase Date: Aggregate Purchase Price: $ Number of Employee Warrant Shares: Exercise Price Per Employee Warrant Share: $ FORM OF EMPLOYEE WARRANT AGREEMENT THIS EMPLOYEE WARRANT AGREEMENT (the “Agreement”), dated as of the purchase date set forth above (the “Purchase Date”), is made by and between Oruka Therapeutics, Inc., a De

September 5, 2024 EX-10.25

Consulting Agreement, effective as of August 30, 2024, by and between Oruka Therapeutics, Inc. and Jeff Dekker (incorporated by reference to Exhibit 10.25 to the Registrant’s Current Report on Form 8-K filed with the SEC on September 5, 2024).

Exhibit 10.25 Certain identified information marked with [***] has been excluded from this exhibit because it is not material and is of the type that the registrant treats as private and confidential. Consulting Agreement This Consulting Agreement (the “Agreement”) is effective as August 30, 2024 (the “Effective Date”), by and between Oruka Therapeutics, Inc., a Delaware corporation, with a princi

September 5, 2024 EX-99.1

Oruka Therapeutics Announces Closing of Merger with ARCA biopharma and Previously Announced Private Placement of $275 Million Oruka is advancing a pipeline of potentially best-in-class biologics that aim to offer greater freedom from disease to peopl

Exhibit 99.1 Oruka Therapeutics Announces Closing of Merger with ARCA biopharma and Previously Announced Private Placement of $275 Million Oruka is advancing a pipeline of potentially best-in-class biologics that aim to offer greater freedom from disease to people with plaque psoriasis and other associated conditions Company on track to advance co-lead programs, ORKA-001 and ORKA-002, into the cli

September 5, 2024 EX-3.2

Certificate of Amendment to Amended and Restated Certificate of Incorporation of the Company, effective August 29, 2024.

Exhibit 3.2 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ARCA BIOPHARMA, INC. ARCA biopharma, Inc., a corporation organized and existing under the laws of the State of Delaware (the “Corporation”), certifies that: 1. The name of the Corporation is ARCA biopharma, Inc. The Corporation’s original Certificate of Incorporation was filed with the Secretary of Sta

September 5, 2024 EX-99.4

ORUKA’S MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Exhibit 99.4 ORUKA’S MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS On August 29, 2024, First Merger Sub merged with and into Oruka, with Oruka continuing as a wholly owned subsidiary of ARCA and the surviving corporation of the merger (the “First Merger”), and Oruka merged with and into Second Merger Sub, with Second Merger Sub being the surviving entity of

September 5, 2024 EX-21.1

List of Subsidiaries of Oruka Therapeutics, Inc.

Exhibit 21.1 SUBSIDIARIES OF ORUKA THERAPEUTICS, INC. Legal Name Jurisdiction of Organization Oruka Therapeutics Operating Company, LLC Delaware Oruka Therapeutics Australia Pty Ltd Australia

September 5, 2024 EX-10.13

Second Amendment to Amended and Restated Oruka Therapeutics, Inc. 2024 Equity Incentive Plan, effective as of May 7, 2024.

Exhibit 10.13 SECOND AMENDMENT TO THE ORUKA THERAPEUTICS, INC. AMENDED AND RESTATED 2024 EQUITY INCENTIVE PLAN WHEREAS, Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), maintains the Oruka Therapeutics, Inc. Amended and Restated 2024 Equity Incentive Plan (the “Plan”); and WHEREAS, pursuant to Section 10(d) of the Plan, the Board may amend the Plan at any time. NOW, THEREFORE, pur

September 5, 2024 EX-10.11

Oruka Therapeutics, Inc. 2024 Employee Stock Purchase Plan (incorporated by reference to Exhibit 10.11 of the Registrant’s Current Report on Form 8-K, filed with the Commission on September 5, 2024).

Exhibit 10.11 ORUKA THERAPEUTICS, INC. 2024 EMPLOYEE STOCK PURCHASE PLAN 1. Purpose The purpose of this Oruka Therapeutics, Inc. 2024 Employee Stock Purchase Plan (the “Plan”) is to provide employees of the Company and its Designated Subsidiaries with an opportunity to purchase Common Stock through accumulated Contributions. The Company’s intention is to have the Plan qualify as an “employee stock

September 5, 2024 EX-3.4

Certificate of Amendment to Amended and Restated Certificate of Incorporation of the Company, effective September 3, 2024.

Exhibit 3.4 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ARCA BIOPHARMA, INC. ARCA biopharma, Inc., a corporation organized and existing under the laws of the State of Delaware (the “Corporation”), certifies that: 1. The name of the Corporation is ARCA biopharma, Inc. The Corporation’s original Certificate of Incorporation was filed with the Secretary of Sta

September 5, 2024 EX-3.3

Certificate of Amendment to Amended and Restated Certificate of Incorporation of the Company, effective August 29, 2024.

Exhibit 3.3 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ARCA BIOPHARMA, INC. ARCA biopharma, Inc., a corporation organized and existing under the laws of the State of Delaware (the “Corporation”), certifies that: 1. The name of the Corporation is ARCA biopharma, Inc. The Corporation’s original Certificate of Incorporation was filed with the Secretary of Sta

August 27, 2024 EX-99.1

ARCA biopharma Provides Update Regarding Special Dividend Amount in Connection with the Proposed Merger with Oruka Therapeutics

Exhibit 99.1 ARCA biopharma Provides Update Regarding Special Dividend Amount in Connection with the Proposed Merger with Oruka Therapeutics Westminster, CO, August 26, 2024 – ARCA biopharma, Inc. (NASDAQ: ABIO) (“ARCA”) today announced an update to the previously announced final amount of the special cash dividend (the “Special Dividend”), which will now equal $1.613 per share of ARCA’s common st

August 27, 2024 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 26, 2024 ARCA biopharma, I

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 26, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 27, 2024 425

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 26, 2024 ARCA biopharma, I

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 26, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 27, 2024 EX-99.1

ARCA biopharma Provides Update Regarding Special Dividend Amount in Connection with the Proposed Merger with Oruka Therapeutics

Exhibit 99.1 ARCA biopharma Provides Update Regarding Special Dividend Amount in Connection with the Proposed Merger with Oruka Therapeutics Westminster, CO, August 26, 2024 – ARCA biopharma, Inc. (NASDAQ: ABIO) (“ARCA”) today announced an update to the previously announced final amount of the special cash dividend (the “Special Dividend”), which will now equal $1.613 per share of ARCA’s common st

August 23, 2024 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

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 22, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 23, 2024 EX-99.1

ARCA biopharma Announces 1-for-12 Reverse Stock Split in Connection with the Proposed Merger with Oruka Therapeutics

Exhibit 99.1 ARCA biopharma Announces 1-for-12 Reverse Stock Split in Connection with the Proposed Merger with Oruka Therapeutics Westminster, CO, August 23, 2024 – ARCA biopharma, Inc. (NASDAQ: ABIO) (“ARCA”) today announced that its Board of Directors (the “Board”) has approved a reverse stock split of ARCA’s common stock at a ratio of 1-for-12. ARCA’s common stock is expected to begin trading o

August 16, 2024 EX-99.1

ARCA biopharma Declares Special Dividend in Connection with the Proposed Merger with Oruka Therapeutics Special dividend estimated to be $1.59 per share Payment of special dividend conditioned upon ARCA stockholder approval of the Proposed Merger wit

Exhibit 99.1 ARCA biopharma Declares Special Dividend in Connection with the Proposed Merger with Oruka Therapeutics Special dividend estimated to be $1.59 per share Payment of special dividend conditioned upon ARCA stockholder approval of the Proposed Merger with Oruka Westminster, CO, August 16, 2024 – ARCA biopharma, Inc. (NASDAQ: ABIO) (“ARCA”) today announced that its Board of Directors has d

August 16, 2024 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 16, 2024 ARCA biopharma, I

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 16, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 16, 2024 EX-99.1

ARCA biopharma Declares Special Dividend in Connection with the Proposed Merger with Oruka Therapeutics Special dividend estimated to be $1.59 per share Payment of special dividend conditioned upon ARCA stockholder approval of the Proposed Merger wit

Exhibit 99.1 ARCA biopharma Declares Special Dividend in Connection with the Proposed Merger with Oruka Therapeutics Special dividend estimated to be $1.59 per share Payment of special dividend conditioned upon ARCA stockholder approval of the Proposed Merger with Oruka Westminster, CO, August 16, 2024 – ARCA biopharma, Inc. (NASDAQ: ABIO) (“ARCA”) today announced that its Board of Directors has d

August 16, 2024 425

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 16, 2024 ARCA biopharma, I

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 16, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 15, 2024 EX-10.1

Asset Purchase Agreement, dated August 14, 2024, by and between ARCA biopharma, Inc. and Genvara Biopharma, Inc.

Exhibit 10.1 ASSET PURCHASE AGREEMENT This Asset Purchase Agreement (“Agreement”) is made as of August 14, 2024 (“Effective Date”), by and between Genvara Biopharma, Inc., a Colorado corporation (the “Buyer”) and ARCA biopharma, Inc., a Delaware corporation (the “Seller”) (each a “Party,” and together the “Parties”). WHEREAS, Seller is a party to that certain Agreement and Plan of Merger and Reorg

August 15, 2024 EX-10.1

Asset Purchase Agreement, dated August 14, 2024, by and between ARCA biopharma, Inc. and Genvara Biopharma, Inc.

Exhibit 10.1 ASSET PURCHASE AGREEMENT This Asset Purchase Agreement (“Agreement”) is made as of August 14, 2024 (“Effective Date”), by and between Genvara Biopharma, Inc., a Colorado corporation (the “Buyer”) and ARCA biopharma, Inc., a Delaware corporation (the “Seller”) (each a “Party,” and together the “Parties”). WHEREAS, Seller is a party to that certain Agreement and Plan of Merger and Reorg

August 15, 2024 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

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 14, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 15, 2024 425

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

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 14, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 9, 2024 425

© 2 0 2 4 O R U K A T H E R A P E U T I C S Corporate Overview August 2024 Filed by ARCA biopharma, Inc. Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a - 12 of the Securities Exchange Act of 1

Filed by ARCA biopharma, Inc. Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934, as amended Subject Company: ARCA biopharma, Inc. (Commission File No. 333-279387) © 2 0 2 4 O R U K A T H E R A P E U T I C S Corporate Overview August 2024 Filed by ARCA biopharma, Inc. Pursuant to Rule 425 under the Secu

August 1, 2024 425

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

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 01, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 1, 2024 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (E

August 1, 2024 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 01, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 1, 2024 EX-99.1

ARCA biopharma Announces Second Quarter 2024 Financial Results and Provides Corporate Update

Exhibit 99.1 ARCA biopharma Announces Second Quarter 2024 Financial Results and Provides Corporate Update - Westminster, CO, August 1, 2024 – ARCA biopharma, Inc. (Nasdaq: ABIO), (the “Company”) a biopharmaceutical company applying a precision medicine approach to developing genetically targeted therapies for cardiovascular diseases, today reported second quarter 2024 financial results and provide

August 1, 2024 424B3

ARCA biopharma, Inc.

Filed Pursuant to Rule 424(b)(3) Registration No. 333-279387 Prospectus Supplement No. 1 (To Proxy Statement/Prospectus dated July 22, 2024) ARCA biopharma, Inc. This prospectus supplement updates, amends and supplements the proxy statement/prospectus dated July 22, 2024 (the “Proxy Statement/Prospectus”), relating to the proposed merger of ARCA biopharma, Inc., a Delaware corporation (“ARCA”), an

July 23, 2024 CORRESP

ARCA biopharma, Inc. 10170 Church Ranch Way, Suite 100 Westminster, CO 80021 July 23, 2024

ARCA biopharma, Inc. 10170 Church Ranch Way, Suite 100 Westminster, CO 80021 July 23, 2024 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Life Sciences 100 F. Street, N.E. Washington, D.C. 20549 Attention: Ibolya Ignat, Daniel Gordon, Tamika Shepard and Joshua Gorsky Re: ARCA biopharma, Inc. Registration Statement on Form S-4 File No. 333- 2793

July 22, 2024 CORRESP

austin beijing boston BOULDER brussels hong kong london los angeles new york palo alto SALT LAKE CITY san diego san francisco seattle shanghai washington, dc wilmington, de

Wilson Sonsini Goodrich & Rosati Professional Corporation 1881 9th Street Boulder, Colorado 80302-5148 o: 303.

July 22, 2024 S-4/A

As filed with the Securities and Exchange Commission on July 22, 2024

As filed with the Securities and Exchange Commission on July 22, 2024 No. 333-279387 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 3 to FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 –––––––––––––––––––––––––– ARCA BIOPHARMA, INC. (Exact name of registrant as specified in its charter) Delaware 2835 36-3855489 (State or other jurisdiction of

July 9, 2024 S-4/A

As filed with the Securities and Exchange Commission on July 9, 2024

As filed with the Securities and Exchange Commission on July 9, 2024 No. 333-279387 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 2 to FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 –––––––––––––––––––––––––– ARCA BIOPHARMA, INC. (Exact name of registrant as specified in its charter) Delaware 2835 36-3855489 (State or other jurisdiction of

July 9, 2024 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 3, 2024 ARCA biopharma, Inc.

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 3, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File

July 9, 2024 CORRESP

austin beijing boston BOULDER brussels hong kong london los angeles new york palo alto SALT LAKE CITY san diego san francisco seattle shanghai washington, dc wilmington, de

Wilson Sonsini Goodrich & Rosati Professional Corporation 1881 9th Street Suite 110 Boulder, CO 80302 o: 303.

July 9, 2024 EX-10.1

Form of Amendment to Oruka Subscription Agreement (incorporated by reference to Exhibit 10.1 to ARCA biopharma, Inc’s Form 8-K filed on July 9, 2024).

Exhibit 10.1 July 3, 2024 Oruka Therapeutics, Inc. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 Attention: Lawrence Klein Email: [***] RE: Subscription Agreement – Purchase Price To Whom It May Concern: Reference is made to that certain Subscription Agreement, dated April 3, 2024 (the “Subscription Agreement”), by and among Oruka Therapeutics, Inc. (the “Company”) each of the purc

July 9, 2024 EX-10.1

Form of Amendment

Exhibit 10.1 July 3, 2024 Oruka Therapeutics, Inc. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 Attention: Lawrence Klein Email: [***] RE: Subscription Agreement – Purchase Price To Whom It May Concern: Reference is made to that certain Subscription Agreement, dated April 3, 2024 (the “Subscription Agreement”), by and among Oruka Therapeutics, Inc. (the “Company”) each of the purc

July 9, 2024 EX-10.2

Form of A&R Subscription Agreement

Exhibit 10.2 AMENDED AND RESTATED SUBSCRIPTION AGREEMENT This Amended and Restated Subscription Agreement (this “Agreement”) is made and entered into as of July 3, 2024 (the “Effective Date”) by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), each of the purchasers listed on the signature pages hereto, severally and not jointly (each a “Purchaser” and together, the “Pur

July 9, 2024 425

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 3, 2024 ARCA biopharma, Inc.

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 3, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File

July 9, 2024 EX-10.2

Form of Amended & Restated Oruka Subscription Agreement (incorporated by reference to Exhibit 10.2 to ARCA biopharma, Inc’s Form 8-K filed on July 9, 2024).

Exhibit 10.2 AMENDED AND RESTATED SUBSCRIPTION AGREEMENT This Amended and Restated Subscription Agreement (this “Agreement”) is made and entered into as of July 3, 2024 (the “Effective Date”) by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), each of the purchasers listed on the signature pages hereto, severally and not jointly (each a “Purchaser” and together, the “Pur

June 18, 2024 S-4/A

As filed with the Securities and Exchange Commission on June 18, 2024

As filed with the Securities and Exchange Commission on June 18, 2024 No. 333-279387 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 to FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ARCA BIOPHARMA, INC. (Exact name of registrant as specified in its charter) Delaware 2835 36-3855489 (State or other jurisdiction of incorporation or organizat

June 18, 2024 CORRESP

austin beijing boston BOULDER brussels hong kong london los angeles new york palo alto SALT LAKE CITY san diego san francisco seattle shanghai washington, dc wilmington, de

Wilson Sonsini Goodrich & Rosati Professional Corporation 650 Page Mill Road Palo Alto, California 94304-1050 o: 650.

June 18, 2024 EX-10.51

Amended and Restated Antibody Discovery and Option Agreement (IL-23), dated March 28, 2024, by and among Paragon Therapeutics, Inc., Paruka Holding LLC and Oruka Therapeutics, Inc.

Exhibit 10.51 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. AMENDED AND RESTATED ANTIBODY DISCOVERY AND OPTION AGREEMENT This Amended and Restated Antibody Discovery and Option Agreement (“Agreement”) is entered into and effective as

June 18, 2024 EX-10.50

Amended and Restated Antibody Discovery and Option Agreement (IL-17), dated March 28, 2024, by and among Paragon Therapeutics, Inc., Paruka Holding LLC and Oruka Therapeutics, Inc.

Exhibit 10.50 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED. AMENDED AND RESTATED ANTIBODY DISCOVERY AND OPTION AGREEMENT This Amended and Restated Antibody Discovery and Option Agreement (“Agreement”) is entered into and effective as

June 6, 2024 425

©2024 Oruka Therapeutics 1 Company Overview June 2024 ©2024 Oruka Therapeutics Filed by Arca biopharma, Inc. Pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a - 12 of the Securities Exchange Act

©2024 Oruka Therapeutics 1 Company Overview June 2024 ©2024 Oruka Therapeutics Filed by Arca biopharma, Inc.

May 14, 2024 EX-99.9

Consent of Peter Harwin to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.9 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any a

May 14, 2024 EX-10.43

Amended and Restated Director Offer Letter, dated March 22, 2024, between Oruka Therapeutics, Inc. and Samarth Kulkarni

Exhibit 10.43 ORUKA THERAPEUTICS, INC. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 March 22, 2024 Via Email Samarth Kulkarni, Ph.D. Re: Appointment to Oruka Therapeutics, Inc. Board of Directors Dear Dr. Kulkarni, I am pleased to present this formal offer to join the Board of Directors (the “Board”) of Oruka Therapeutics, Inc. (the “Company”). This offer is contingent upon (i) yo

May 14, 2024 EX-4.3

Investor Rights Agreement, dated March 6, 2024, by and among Oruka Therapeutics, Inc. and certain parties thereto.

Exhibit 4.3 INVESTORS’ RIGHTS AGREEMENT THIS INVESTORS’ RIGHTS AGREEMENT (this “Agreement”), is made as of March 6, 2024, by and among Oruka Therapeutics, Inc. a Delaware corporation (the “Company”), each of the investors listed on Schedule A hereto, each of which is referred to in this Agreement as an “Investor”, and each of the securityholders listed on Schedule B hereto, each of whom is referre

May 14, 2024 EX-10.41

Form of Restricted Stock Notice and Restricted Stock Purchase Agreement of Oruka Therapeutics, Inc.

Exhibit 10.41 ORUKA THERAPEUTICS, INC. RESTRICTED STOCK NOTICE Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), hereby grants to Purchaser (as defined below) the number of Shares (as defined below) of the Company’s common stock, par value $0.0001 per share (the “Common Stock”) set forth below, upon the terms and subject to the conditions set forth in the Restricted Stock Purchase

May 14, 2024 EX-99.6

Consent of Lawrence Klein to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.6 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any a

May 14, 2024 EX-99.7

Consent of Kristine Ball to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.7 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any a

May 14, 2024 EX-99.10

Consent of Samarth Kulkarni to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.10 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any

May 14, 2024 EX-10.44

Director Offer Letter, dated April 24, 2024, between Oruka Therapeutics, Inc. and Kristine Ball

Exhibit 10.44 ORUKA THERAPEUTICS, INC. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 April 24th, 2024 Kristine Ball Re: Appointment to Oruka Therapeutics, Inc. Board of Directors Dear Ms. Ball, I am pleased to present this formal offer to join the Board of Directors (the “Board”) of Oruka Therapeutics, Inc. (the “Company”) as a member and chair of our Audit Committee. This offer is

May 14, 2024 EX-10.45

Form of Indemnification Agreement between Oruka Therapeutics, Inc. and its directors and officers

Exhibit 10.45 INDEMNIFICATION AGREEMENT THIS INDEMNIFICATION AGREEMENT (the “Agreement”) is made and entered into as of [●], 2024 between Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), and [●] (“Indemnitee”). WITNESSETH THAT: WHEREAS, highly competent persons have become more reluctant to serve companies as directors or officers, or in other capacities unless they are provided w

May 14, 2024 EX-3.6

Bylaws of Oruka Therapeutics, Inc, as currently in effect.

Exhibit 3.6 ORUKA THERAPEUTICS, INC. BYLAWS Adopted February 6, 2024 Article I STOCKHOLDERS Section 1. Annual Meeting. An annual meeting of the stockholders, for the election of directors to succeed those whose terms expire and for the transaction of such other business as may properly come before the meeting, shall be held at such place, on such date, and at such time as the Board of Directors sh

May 14, 2024 EX-3.5

Amended and Restated Certificate of Incorporation of Oruka Therapeutics, Inc.

Exhibit 3.5 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ORUKA THERAPEUTICS, INC. Oruka Therapeutics, Inc., a corporation organized and existing under and by virtue of the provisions of the General Corporation Law of the State of Delaware (the “DGCL”), DOES HEREBY CERTIFY: 1. That the name of this corporation is Oruka Therapeutics, Inc. (the “Corporation”). The original Certificate of Inco

May 14, 2024 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) ARCA BIOPHARMA, INC.

May 14, 2024 EX-99.8

Consent of Carl Dambkowski to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.8 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any a

May 14, 2024 EX-99.11

Consent of Cameron Turtle to serve as a director of ARCA biopharma, Inc., to be renamed Oruka Therapeutics, Inc.

Exhibit 99.11 Consent to be Named as a Director ARCA biopharma, Inc. is filing a Registration Statement on Form S-4 (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any

May 14, 2024 EX-21.1

List of Subsidiaries of ARCA biopharma, Inc.

Exhibit 21.1 SUBSIDIARIES OF ARCA BIOPHARMA, INC. Legal Name State of Organization Atlas Merger Sub Corp. Delaware Atlas Merger Sub II, LLC Delaware

May 14, 2024 EX-10.47

Employment Offer Letter, dated March 11, 2024, by and between Oruka Therapeutics, Inc. and Arjun Agarwal

Exhibit 10.47 March 11, 2024 Arjun Agarwal Email – Re: Offer of Employment Dear Arjun: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am very pleased to offer you a position as Senior Vice President, Finance (the “Role”) pursuant to this letter agreement (the “Agreement”), provided you accept such offer as indicated by your signature below. Your employment with the Company in the Role wi

May 14, 2024 EX-10.49

Employment Offer Letter, dated April 12, 2024, by and between Oruka Therapeutics, Inc. and Paul Quinlan

Exhibit 10.49 ORUKA THERAPEUTICS, INC. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 April 12, 2024 Paul Quinlan Email – Re: Offer of Employment Dear Paul: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am very pleased to offer you a position as General Counsel of the Company (the “Role”) pursuant to this letter agreement (the “Agreement”), provided you accept such offer

May 14, 2024 S-4

As filed with the Securities and Exchange Commission on May 13, 2024

As filed with the Securities and Exchange Commission on May 13, 2024 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ARCA BIOPHARMA, INC. (Exact name of registrant as specified in its charter) Delaware 2835 36-3855489 (State or other jurisdiction of incorporation or organization) (Primary Standard Ind

May 14, 2024 EX-99.5

Consent of Lucid Capital Markets, LLC.

Exhibit 99.5 Consent of Lucid Capital Markets, LLC May 13, 2024 Board of Directors ARCA biopharma, Inc. 10170 Church Ranch Way, Suite 100 Westminster, CO 80021 Re: Registration Statement on Form S-4 of ARCA biopharma, Inc. Members of the Board: We hereby consent to the inclusion of our opinion letter, dated April 2, 2024, to the Board of Directors of ARCA biopharma, Inc. (“ARCA”) as Annex B to, an

May 14, 2024 EX-10.46

Amended and Restated Employment Offer Letter, dated February 14, 2024, by and between Oruka Therapeutics, Inc. and Lawrence Klein

Exhibit 10.46 ORUKA THERAPEUTICS, INC. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 February 14, 2024 Lawrence Klein Email – Re: Amended and Restated Oruka Therapeutics CEO Offer Letter Agreement Dear Lawrence: On behalf of the Board of Directors of Oruka Therapeutics, Inc. (the “Company”), I am very pleased to offer you a position as Chief Executive Officer of the Company (“CEO”)

May 14, 2024 EX-10.40

Amended and Restated Oruka Therapeutics, Inc. 2024 Equity Incentive Plan, as amended by the First Amendment dated May 7, 2024

Exhibit 10.40 ORUKA THERAPEUTICS, INC. AMENDED and RESTATED 2024 Equity INCENTIVE PLAN 1. Purpose. The purpose of this Amended and Restated 2024 Equity Incentive Plan (as amended and restated, the “Plan”) of Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), is to advance the interests of the Company’s stockholders by enhancing the Company’s ability to attract, retain and motivate p

May 14, 2024 EX-10.42

Form of Stock Option Agreement under Oruka Therapeutics, Inc. 2024 Equity Incentive Plan

Exhibit 10.42 ORUKA Therapeutics, Inc. AMENDED AND RESTATED 2024 EQUITY INCENTIVE PLAN Stock Option Agreement [Incentive stock option // non-statutory stock option] 1. Grant of Option. (a) This Stock Option Agreement (this “Agreement”) evidences the grant by Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), on (the “Grant Date”) to (the “Participant”) of an option (this “Option”) t

May 14, 2024 EX-10.48

Employment Offer Letter, dated March 15, 2024, by and between Oruka Therapeutics, Inc. and Joana Goncalves

Exhibit 10.48 ORUKA THERAPEUTICS, INC. 221 Crescent Street, Building 23, Suite 105 Waltham, MA 02453 March 15, 2024 Joana Goncalves Email – Re: Offer of Employment Dear Joanna: On behalf of Oruka Therapeutics, Inc. (the “Company”), I am very pleased to offer you a position as Chief Medical Officer of the Company (the “Role”) pursuant to this letter agreement (the “Agreement”), provided you accept

April 29, 2024 SC 13G

ABIO / ARCA biopharma, Inc. / Venrock Healthcare Capital Partners III, L.P. - SC 13G Passive Investment

SC 13G 1 tm2412836d2sc13g.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ARCA biopharma, Inc. (Name of Issuer) Common stock, $0.001 par value per share (Title of Class of Securities) 00211Y506 (CUSIP Number) April 17, 2024 (Date of Event Which Requires Filing of this Statement) Check the ap

April 25, 2024 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2024 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (

April 25, 2024 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

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 25, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

April 25, 2024 EX-99.1

ARCA biopharma Announces First Quarter 2024 Financial Results and Provides Corporate Update

Exhibit 99.1 ARCA biopharma Announces First Quarter 2024 Financial Results and Provides Corporate Update - • ARCA biopharma and Oruka Therapeutics announce Merger Agreement • ARCA biopharma appoints Thomas Keuer as President Westminster, CO, April 25, 2024 – ARCA biopharma, Inc. (Nasdaq: ABIO), (the “Company”) a biopharmaceutical company applying a precision medicine approach to developing genetic

April 25, 2024 425

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

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 25, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

April 23, 2024 EX-10.1

Second Amendment to Retention Bonus Letter, dated April 22, 2024, by and between ARCA biopharma, Inc. and Thomas A. Keuer (incorporated by reference to Exhibit 10.1 of ARCA biopharma, Inc.’s Form 8-K filed on April 23, 2024).

Exhibit 10.1 ARCA BIOPHARMA, INC. SECOND AMENDMENT TO RETENTION BONUS LETTER This second amendment (this “Amendment”) is entered into effective as of April 22, 2024 by and between Thomas A. Keuer (“Executive”) and ARCA biopharma, Inc. (the “Company,” and together with Executive, the “Parties”). WHEREAS, the Parties entered into a retention bonus letter agreement dated December 8, 2022 and an amend

April 23, 2024 EX-10.2

Second Amendment to Retention Bonus Letter, dated April 22, 2024, by and between ARCA biopharma, Inc. and C. Jeffrey Dekker (incorporated by reference to Exhibit 10.2 of ARCA biopharma, Inc.’s Form 8-K filed on April 23, 2024).

Exhibit 10.2 ARCA BIOPHARMA, INC. SECOND AMENDMENT TO RETENTION BONUS LETTER This second amendment (this “Amendment”) is entered into effective as of April 22, 2024 by and between C. Jeffrey Dekker (“Executive”) and ARCA biopharma, Inc. (the “Company,” and together with Executive, the “Parties”). WHEREAS, the Parties entered into a retention bonus letter agreement dated December 8, 2022 and an ame

April 23, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 23, 2024 (April 20, 2024) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation

April 15, 2024 SC 13G

ABIO / ARCA biopharma, Inc. / Allostery Investments LP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ARCA biopharma, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 00211Y506 (CUSIP Number) April 3, 2024 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule p

April 9, 2024 SC 13G

ABIO / ARCA biopharma, Inc. / Avidity Partners Management LP Passive Investment

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

April 5, 2024 SC 13D

ABIO / ARCA biopharma, Inc. / Adage Capital Management, L.P. - ARCA BIOPHARMA, INC. Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* ARCA biopharma, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 00211Y506 (CUSIP Number) Robert Atchinson Adage Capital Partners GP, L.L.C. 200 Clarendon Street, 52nd Floor Boston, MA 02116 (617) 867-2800 (Name, Address an

April 5, 2024 SC 13G/A

ABIO / ARCA biopharma, Inc. / Western Standard LLC - SC 13G/A Passive Investment

SC 13G/A 1 d804055dsc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* ARCA biopharma, Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class Securities) 00211Y506 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the

April 5, 2024 EX-99

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)

EX-99 2 p24-1381exhibit99.htm JOINT FILING AGREEMENT EXHIBIT 99.1 JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing add

April 4, 2024 EX-10.1

Separation Agreement and Release, by and between ARCA and Michael Bristow, dated as of April 3, 2024 (incorporated by reference to Exhibit 10.1 of ARCA biopharma, Inc.’s Form 8-K filed on April 4, 2024).

Exhibit 10.1 SEPARATION AGREEMENT AND RELEASE This Separation Agreement and Release (“Agreement”) is made by and between Michael Bristow (“Executive”) and ARCA biopharma, Inc. (formerly known as ARCA Discovery, Inc.) (the “Company”) (collectively referred to as the “Parties” or individually referred to as a “Party”). RECITALS WHEREAS, Executive was employed at-will by the Company; WHEREAS, Executi

April 4, 2024 EX-10.2

Consulting Agreement, by and between ARCA and Michael Bristow, dated as of April 3, 2024 (incorporated by reference to Exhibit 10.2 of ARCA biopharma, Inc.’s Form 8-K filed on April 4, 2024).

Exhibit 10.2 Certain identified information marked with [***] has been excluded from this exhibit because it is not material and is of the type that the registrant treats as private and confidential. ARCA BIOPHARMA, INC. CONSULTING AGREEMENT This Consulting Agreement (this “Agreement”) is made and entered into as of April 3, 2024 (the “Effective Date”) by and between ARCA biopharma, Inc. (the “Com

April 4, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 4, 2024 (April 02, 2024) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation)

April 3, 2024 EX-2.1

Agreement and Plan of Merger and Reorganization, dated as of April 3, 2024, by and among ARCA biopharma, Inc., Atlas Merger Sub Corp., Atlas Merger Sub II, LLC and Oruka Therapeutics, Inc.

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER AND REORGANIZATION among: ARCA BIOPHARMA, INC.; ATLAS MERGER SUB CORP.; ATLAS MERGER SUB II, LLC; and ORUKA THERAPEUTICS, INC. Dated as of April 3, 2024 Table of Contents Section 1. Definitions and Interpretative Provisions 3 1.1 Definitions 3 1.2 Other Definitional and Interpretative Provisions 17 Section 2. Description of Transaction 18 2.1 The Merger 18

April 3, 2024 425

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 3, 2024 ARCA biopharma, Inc

425 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 3, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission

April 3, 2024 EX-99.3

ARCA biopharma, Inc. and Oruka Therapeutics, Inc. Merger Agreement Announcement Webcast Call Transcript Wednesday, April 3, 2024 8:30 a.m. ET

EX-99.3 Exhibit 99.3 ARCA biopharma, Inc. and Oruka Therapeutics, Inc. Merger Agreement Announcement Webcast Call Transcript Wednesday, April 3, 2024 8:30 a.m. ET Operator Good morning, Ladies and Gentlemen. Thank you for standing by. Welcome to the ARCA Biopharma – Oruka Therapeutics Transaction Conference Call. I would also like to remind you that this call is being recorded for replay. I will n

April 3, 2024 EX-10.1

Form of Oruka Support Agreement (incorporated by reference to Exhibit 10.1 to ARCA biopharma, Inc’s Form 8-K filed on April 3, 2024).

Exhibit 10.1 SUPPORT AGREEMENT This Support Agreement (this “Agreement”) is made and entered into as of April 3, 2024, by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), ARCA biopharma, Inc., a Delaware corporation (“Parent”), and the undersigned stockholder (the “Stockholder”) of the Company. Capitalized terms used herein but not otherwise defined shall have the respec

April 3, 2024 EX-10.3

Form of ACRA Support Agreement (incorporated by reference to Exhibit 10.3 to ARCA biopharma, Inc’s Form 8-K filed on April 3, 2024).

Exhibit 10.3 SUPPORT AGREEMENT This Support Agreement (this “Agreement”) is made and entered into as of April 3, 2024, by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), ARCA biopharma, Inc., a Delaware corporation (“Parent”), and the undersigned stockholder (the “Stockholder”) of the Parent. Capitalized terms used herein but not otherwise defined shall have the respect

April 3, 2024 EX-10.2

Form of Oruka Subscription Agreement (incorporated by reference to Exhibit 10.2 to ARCA biopharma, Inc’s Form 8-K filed on April 3, 2024).

Exhibit 10.2 SUBSCRIPTION AGREEMENT This Subscription Agreement (this “Agreement”) is made and entered into as of April 3, 2024 (the “Effective Date”) by and among Oruka Therapeutics, Inc., a Delaware corporation (the “Company”), and each of the purchasers listed on the signature pages hereto, severally and not jointly (each a “Purchaser” and together the “Purchasers”). Certain terms used and not

April 3, 2024 EX-99.2

This presentation is strictly confidential and being made to you solely as a prospective investor in the proposed offering (the “Offering”) of common stock, par value $0.001 per share, or, in lieu thereof, pre-funded warrants (together, the “Securiti

Company Overview April 2024 ©2024 Oruka Therapeutics Exhibit 99.2 This presentation is strictly confidential and being made to you solely as a prospective investor in the proposed offering (the “Offering”) of common stock, par value $0.001 per share, or, in lieu thereof, pre-funded warrants (together, the “Securities”) of Oruka Therapeutics, Inc (the “we,” “us,” “our” or the “Company”) in connecti

April 3, 2024 EX-3.1

Form of Certificate of Designation of Preferences, Rights and Limitations of Series B Non-Voting Convertible Preferred Stock (incorporated by reference to Exhibit 3.1 of ARCA biopharma, Inc.’s Form 8-K filed on April 3, 2024).

Exhibit 3.1 ARCA BIOPHARMA, INC. CERTIFICATE OF DESIGNATION OF PREFERENCES, RIGHTS AND LIMITATIONS OF SERIES B NON-VOTING CONVERTIBLE PREFERRED STOCK Pursuant to Section 151 of the General Corporation Law of the State of Delaware THE UNDERSIGNED DOES HEREBY CERTIFY, on behalf of ARCA biopharma, Inc., a Delaware corporation (the “Corporation”), that the following resolution was duly adopted by the

April 3, 2024 EX-99.1

ARCA biopharma and Oruka Therapeutics Announce Merger Agreement Merger to create a company focused on advancing Oruka’s portfolio of novel biologics that aim to redefine the standard of care for patients with chronic skin diseases Oruka, the third co

EX-99.1 Exhibit 99.1 ARCA biopharma and Oruka Therapeutics Announce Merger Agreement Merger to create a company focused on advancing Oruka’s portfolio of novel biologics that aim to redefine the standard of care for patients with chronic skin diseases Oruka, the third company founded based on assets generated by Paragon Therapeutics, expects to advance ORKA-001 and ORKA-002, potentially best-in-cl

April 3, 2024 EX-10.4

Form of Lock-Up Agreement (incorporated by reference to Exhibit 10.4 to ARCA biopharma, Inc’s Form 8-K filed on April 3, 2024).

Exhibit 10.4 LOCK-UP AGREEMENT April 3, 2024 ARCA biopharma, Inc. 10170 Church Ranch Way, Suite 100 Westminster, CO Ladies and Gentlemen: The undersigned signatory of this lock-up agreement (this “Lock-Up Agreement”) understands that ARCA biopharma, Inc., a Delaware corporation (“Parent”), has entered into an Agreement and Plan of Merger and Reorganization, dated as of April 3, 2024 (as the same m

April 3, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement

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 3, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File

March 22, 2024 8-K

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): March 22, 2024 (March 19, 2024) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation

March 22, 2024 EX-10.1

First Amendment to Office Lease Agreement, dated March 19, 2024, by and between ARCA biopharma, Inc. and Lotus Church Ranch, LLC (incorporated by reference to Exhibit 10.1 of ARCA biopharma, Inc.’s Form 8-K filed on March 22, 2024).

Exhibit 10.1 FIRST AMENDMENT TO OFFICE LEASE AGREEMENT THIS FIRST AMENDMENT TO OFFICE LEASE AGREEMENT (this “Agreement”), made as of this day the 19th of March, 2024, between Lotus Church Ranch, LLC (“Landlord”) and ARCA Biopharma, Inc., (“Tenant”). W I T N E S S E T H: WHEREAS, Landlord entered into a certain Office Lease Agreement with Tenant dated as of August 7, 2020 for space commonly known a

February 7, 2024 SC 13G/A

ABIO / ARCA biopharma, Inc. / BML Investment Partners, L.P. Passive Investment

SC 13G/A 1 arca13g020724.htm SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G* (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 (AMENDMENT NO. 2 )* ARCA Biopharma, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number)

February 6, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): February 02, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission

February 1, 2024 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, 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: 000-22873 ARCA BIOPHARMA

February 1, 2024 EX-99.1

ARCA biopharma Announces 2023 Financial Results

Exhibit 99.1 ARCA biopharma Announces 2023 Financial Results - • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, February 1, 2024 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targeted therapie

February 1, 2024 EX-19

Insider Trading Policy.

Exhibit 19 ARCA BIOPHARMA, INC. INSIDER TRADING POLICY (Adopted on November 29, 2023) A. POLICY OVERVIEW ARCA biopharma, Inc. (together with any subsidiaries, collectively the “Company”) has adopted this Insider Trading Policy (the “Policy”) to help you comply with the federal and state securities laws and regulations that govern trading in securities and to help the Company minimize its own legal

February 1, 2024 EX-97

Compensation Recovery Policy

Exhibit 97 ARCA BIOPHARMA, INC. COMPENSATION RECOVERY POLICY As adopted on November 29, 2023 ARCA biopharma, Inc. (the “Company”) is committed to strong corporate governance. As part of this commitment, the Company’s Board of Directors (the “Board”) has adopted this clawback policy called the Compensation Recovery Policy (the “Policy”). The Policy is intended to further the Company’s pay-for-perfo

February 1, 2024 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 01, 2024 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission

January 31, 2024 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): January 31, 2024 (January 30, 2024) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpora

December 19, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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 (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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

December 19, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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 (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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

December 5, 2023 8-K

Financial Statements and Exhibits, Shareholder Director Nominations

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 5, 2023 (December 04, 2023) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpor

December 4, 2023 EX-10.1

Amendment to Retention Bonus Letter, dated December 4, 2023, by and among ARCA biopharma, Inc. and Thomas A. Keuer (incorporated by reference to Exhibit 10.1 of ARCA biopharma, Inc.’s Form 8-K filed on December 4, 2023).

Exhibit 10.1 ARCA BIOPHARMA, INC. AMENDMENT TO RETENTION BONUS LETTER This amendment (the “Amendment”) is entered into effective as of December 4, 2023 by and between Thomas A. Keuer (“Executive”) and ARCA biopharma, Inc. (the “Company,” and together with Executive, the “Parties”). WHEREAS, the Parties entered into a retention bonus letter agreement dated December 8, 2022 (the “Retention Agreement

December 4, 2023 EX-10.2

Amendment to Retention Bonus Letter, dated December 4, 2023, by and among ARCA biopharma, Inc. and C. Jeffrey Dekker (incorporated by reference to Exhibit 10.2 of ARCA biopharma, Inc.’s Form 8-K filed on December 4, 2023).

Exhibit 10.2 ARCA BIOPHARMA, INC. AMENDMENT TO RETENTION BONUS LETTER This amendment (the “Amendment”) is entered into effective as of December 4, 2023 by and between C. Jeffrey Dekker (“Executive”) and ARCA biopharma, Inc. (the “Company,” and together with Executive, the “Parties”). WHEREAS, the Parties entered into a retention bonus letter agreement dated December 8, 2022 (the “Retention Agreeme

December 4, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): December 4, 2023 (November 29, 2023) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpor

October 18, 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): October 18, 2023 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

October 18, 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, IN

October 18, 2023 EX-99.1

ARCA biopharma Announces Third Quarter 2023 Financial Results

Exhibit 99.1 ARCA biopharma Announces Third Quarter 2023 Financial Results - • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, October 18, 2023 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically tar

September 11, 2023 SC 13G

ABIO / ARCA biopharma Inc / Western Standard LLC - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* ARCA biopharma, Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class Securities) 00211Y506 (CUSIP Number) August 30, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the r

July 21, 2023 EX-99.1

ARCA biopharma Announces Second Quarter 2023 Financial Results

Exhibit 99.1 ARCA biopharma Announces Second Quarter 2023 Financial Results - • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, July 21, 2023 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targe

July 21, 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2023 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (E

July 21, 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

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 21, 2023 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File

April 24, 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2023 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (

April 24, 2023 EX-99

ARCA biopharma Announces First Quarter 2023 Financial Results

Exhibit 99.1 ARCA biopharma Announces First Quarter 2023 Financial Results - • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, April 24, 2023 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targe

April 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

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, 2023 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

February 24, 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: 000-22873 ARCA BIOPHARMA

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

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 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission

February 24, 2023 EX-99

ARCA biopharma Announces 2022 Financial Results and Provides Corporate Update

Exhibit 99.1 ARCA biopharma Announces 2022 Financial Results and Provides Corporate Update - • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, February 24, 2023 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developin

February 13, 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

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 13, 2023 (February 10, 2023) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpo

February 8, 2023 SC 13G/A

ABIO / Arca Biopharma Inc / BML Investment Partners, L.P. - NONE Passive Investment

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 01)* ARCA Biopharma, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Calendar Year 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate t

December 19, 2022 EX-99.1

JaMES FLYNN joins arca biopharma board of directors

Exhibit 99.1 JaMES FLYNN joins arca biopharma board of directors Westminster, CO, December 19, 2022 – ARCA biopharma, Inc. (Nasdaq: ABIO) today announced that James Flynn has joined its Board of Directors. “We are pleased to welcome James Flynn to our Board,” said Robert E. Conway, Chairman of ARCA’s Board of Directors. “We appreciate his participation and input on the Company’s Board of Directors

December 19, 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

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 19, 2022 (December 15, 2022) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpo

December 9, 2022 EX-10.1

Memorandum Regarding Cash Retention Bonus between ARCA biopharma, Inc. and Thomas A, Keuer dated December 8, 2022 (incorporated by reference to Exhibit 10.1 of ARCA biopharma, Inc.’s Form 8-K filed on December 9, 2022).

Exhibit 10.1 MEMORANDUM To: Thomas A. Keuer From: Michael Bristow Date: December 8, 2022 Re: Retention bonus In recognition of your continued service with ARCA biopharma, Inc. (the ?Company?), we are pleased to offer you the opportunity to receive a cash retention bonus in the amount of $100,000, less applicable withholdings and deductions required by law (the ?Retention Bonus?). This Retention Bo

December 9, 2022 EX-10.2

Memorandum Regarding Cash Retention Bonus between ARCA biopharma, Inc. and C. Jeffrey Dekker dated December 8, 2022 (incorporated by reference to Exhibit 10.2 of ARCA biopharma, Inc.’s Form 8-K filed on December 9, 2022).

Exhibit 10.2 MEMORANDUM To: Jeff Dekker From: Michael Bristow Date: December 8, 2022 Re: Retention bonus In recognition of your continued service with ARCA biopharma, Inc. (the ?Company?), we are pleased to offer you the opportunity to receive a cash retention bonus in the amount of $100,000 less applicable withholdings and deductions required by law (the ?Retention Bonus?). This Retention Bonus w

December 9, 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

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 9, 2022 (December 08, 2022) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpor

November 3, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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 (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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

November 3, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEF 14A 1 abio-def14a20221215.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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

October 28, 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): October 28, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

October 28, 2022 EX-99.1

ARCA biopharma Announces Third Quarter 2022 Financial Results

Exhibit 99.1 ARCA biopharma Announces Third Quarter 2022 Financial Results ? Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, October 28, 2022 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targe

October 28, 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2022 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, IN

October 20, 2022 8-K

Financial Statements and Exhibits, Shareholder Director Nominations

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 20, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

August 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): August 2, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

August 2, 2022 EX-99.1

ARCA biopharma Announces Second Quarter 2022 Financial Results

Exhibit 99.1 ARCA biopharma Announces Second Quarter 2022 Financial Results • Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, August 2, 2022 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically target

August 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2022 OR ☐ TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (E

July 8, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Funicular Funds, LP - AMENDMENT NO. 6 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 6)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

June 21, 2022 EX-99.1

Jacob ma-weaver joins arca biopharma board of DIRECTORS

Exhibit 99.1 Jacob ma-weaver joins arca biopharma board of DIRECTORS Westminster, CO, June 21, 2022 ? ARCA biopharma, Inc. (Nasdaq: ABIO) today announced that Jacob Ma-Weaver has joined its Board of Directors. ?We are pleased to welcome Jacob Ma-Weaver, the managing member of ARCA?s largest shareholder, to our Board,? said Robert E. Conway, Chairman of ARCA?s Board of Directors. ?We appreciate his

June 21, 2022 EX-10.1

Cooperation Agreement, dated as of June 15, 2022, by and among ARCA biopharma, Inc., Cable Car Capital LLC, the Funicular Fund LP, Funicular Funds, LP and Jacob Ma-Weaver

Exhibit 10.1 ATTORNEY WORK PRODUCT PRIVILEGED AND CONFIDENTIAL ARCA biopharma, Inc. 10170 Church Ranch Way, Suite 100 Westminster, Colorado 80021 June 14, 2022 Cable Car Capital LLC 2261 Market Street #4307 San Francisco, California 94114 Attn: Jacob Ma-Weaver Ladies and Gentlemen: This letter (this ?Agreement?) constitutes the agreement between (a) ARCA biopharma, Inc. (?Company?) and (b) Cable C

June 21, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Funicular Fund, LP - AMENDMENT NO. 5 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 5)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

June 21, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): June 21, 2022 (June 15, 2022) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation)

May 27, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Ma-Weaver Jacob - AMENDMENT NO. 4 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 4)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

May 11, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Funicular Fund, LP - AMENDMENT NO. 3 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 3)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

May 5, 2022 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): May 5, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File N

May 5, 2022 EX-99.1

ARCA biopharma Retains Ladenburg Thalmann to Support Strategic Options Review

Exhibit 99.1 ARCA biopharma Retains Ladenburg Thalmann to Support Strategic Options Review Westminster, CO, May 5, 2022 – ARCA biopharma, Inc. (Nasdaq: ABIO), today announced that it has retained Ladenburg Thalmann & Co. Inc. to act as its financial advisor. In April 2022, the Board of Directors established a Special Committee to explore and evaluate strategic options for maximizing stockholder va

May 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): May 2, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission File N

May 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2022 OR ? TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, INC. (

May 2, 2022 EX-99.1

ARCA biopharma Announces First Quarter 2022 Financial Results

Exhibit 99.1 ARCA biopharma Announces First Quarter 2022 Financial Results ? Company is currently engaged in a strategic review process, evaluating additional development of its assets, collaborations and other strategic options Westminster, CO, May 2, 2022 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targeted t

April 18, 2022 EX-99.1

ARCA biopharma Establishes Special Committee of the Board of Directors

Exhibit 99.1 ARCA biopharma Establishes Special Committee of the Board of Directors Westminster, CO, April 18, 2022 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targeted therapies for cardiovascular diseases, today announced that its Board of Directors has established a Special Committee to evaluate strategic op

April 18, 2022 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): April 18, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

April 14, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Funicular Fund, LP - AMENDMENT NO. 2 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 2)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

April 4, 2022 SC 13D/A

ABIO / Arca Biopharma Inc / Funicular Fund, LP - AMENDMENT NO. 1 TO THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. 1)1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car

March 31, 2022 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): March 31, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

March 31, 2022 EX-99.1

ARCA biopharma Reports Topline Results for ASPEN-COVID-19 Phase 2b Clinical Trial

Exhibit 99.1 ARCA biopharma Reports Topline Results for ASPEN-COVID-19 Phase 2b Clinical Trial ? For the entire cohort of COVID-19 hospitalized patients, the pooled lower and higher rNAPc2 dose groups demonstrated a reduction compared to baseline in D-dimer levels of 16.8% versus 11.2% for standard of care heparin which was not statistically significant and consequently did not achieve the study p

March 28, 2022 SC 13D

ABIO / Arca Biopharma Inc / Funicular Fund, LP - THE SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO ? 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO ? 240.13d-2(a) (Amendment No. )1 ARCA biopharma, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) Jacob Ma-Weaver Cable Car C

March 18, 2022 424B5

Common Stock

As Filed Pursuant to Rule 424(b)(5) Registration No. 333-254585 PROSPECTUS SUPPLEMENT (To Prospectus Dated March 30, 2021) $11,204,000 Common Stock On April 6, 2021, we entered into an amendment, or the Amendment No. 1, to our Capital on Demand? Sales Agreement, dated July 22, 2020 with JonesTrading Institutional Services LLC, or JonesTrading, or the Original Agreement and, together with the Amend

March 14, 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: 000-22873 ARCA BIOPHARMA

March 14, 2022 EX-99.1

ARCA biopharma Announces 2021 Financial Results and Provides Corporate Update

Exhibit 99.1 ARCA biopharma Announces 2021 Financial Results and Provides Corporate Update - ? Topline data from Phase 2b ASPEN-COVID-19 clinical trial evaluating rNAPc2 as a potential treatment for COVID?19 anticipated in the last week of March 2022 Westminster, CO, March 14, 2022 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developi

March 14, 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 14, 2022 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission Fil

January 27, 2022 SC 13G

ABIO / Arca Biopharma Inc / BML Investment Partners, L.P. - NONE Passive Investment

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. n/a )* ARCA Biopharma, INC. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 00211Y506 (CUSIP Number) January 24, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate t

December 16, 2021 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): December 16, 2021 (December 14, 2021) ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorpo

December 2, 2021 EX-99.1

ARCA biopharma Announces Completion of Enrollment in Phase 2b ASPEN-COVID-19 Clinical Trial Evaluating rNAPc2 as a Potential Treatment for Patients Hospitalized with COVID-19

Exhibit 99.1 ARCA biopharma Announces Completion of Enrollment in Phase 2b ASPEN-COVID-19 Clinical Trial Evaluating rNAPc2 as a Potential Treatment for Patients Hospitalized with COVID-19 ? Topline readout of clinical trial results anticipated in first quarter of 2022 Westminster, CO, December 2, 2021 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine

December 2, 2021 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): December 2, 2021 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

November 2, 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): November 2, 2021 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

November 2, 2021 EX-99.1

ARCA biopharma Announces Third Quarter 2021 Financial Results and Provides Corporate Update

Exhibit 99.1 ARCA biopharma Announces Third Quarter 2021 Financial Results and Provides Corporate Update - ? On-going Phase 2b clinical trial (ASPEN-COVID-19) evaluating rNAPc2 as a potential treatment for COVID?19 ? DSMC interim analysis of safety and efficacy data from ASPEN-COVID-19 completed with recommendation to continue trial to completion with no modifications ? Topline data anticipated in

November 2, 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 UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2021 OR ? TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 000-22873 ARCA BIOPHARMA, IN

October 28, 2021 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): October 28, 2021 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission F

October 28, 2021 EX-99.1

ASPEN-COVID-19 Data and Safety Monitoring Committee Recommends Continuing Phase 2b Clinical Trial to Completion Based on Interim Analysis of Efficacy and Safety Data

EX-99.1 2 abio-ex9916.htm EX-99.1 Exhibit 99.1 ASPEN-COVID-19 Data and Safety Monitoring Committee Recommends Continuing Phase 2b Clinical Trial to Completion Based on Interim Analysis of Efficacy and Safety Data • Enrollment completion anticipated by year end 2021 • Topline data anticipated in first quarter of 2022 Westminster, CO, October 28, 2021 – ARCA biopharma, Inc. (Nasdaq: ABIO), a biophar

September 16, 2021 EX-99.1

ARCA biopharma Announces Enrollment of First International Patient in Phase 2b Clinical Trial Evaluating rNAPc2 as a Potential Treatment for COVID-19

Exhibit 99.1 ARCA biopharma Announces Enrollment of First International Patient in Phase 2b Clinical Trial Evaluating rNAPc2 as a Potential Treatment for COVID-19 - ? First international patient enrolled in Brazil ? Trial approximately 75% enrolled ? rNAPc2 development focused on unmet need for treatments in hospitalized COVID-19 patients ? Topline trial data anticipated in the fourth quarter of 2

September 16, 2021 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): September 16, 2021 ARCA biopharma, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 000-22873 36-3855489 (State or Other Jurisdiction of Incorporation) (Commission

August 9, 2021 EX-99.1

ARCA biopharma Announces Submission of PCT Patent Application for the Treatment of Coronavirus Infection and Associated Coagulopathy with rNAPc2

Exhibit 99.1 ARCA biopharma Announces Submission of PCT Patent Application for the Treatment of Coronavirus Infection and Associated Coagulopathy with rNAPc2 Westminster, CO, August 9, 2021 ? ARCA biopharma, Inc. (Nasdaq: ABIO), a biopharmaceutical company applying a precision medicine approach to developing genetically targeted therapies for cardiovascular diseases, today announced that it has su

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