Sec Form 4 Filing - Ma-Weaver Jacob @ ARCA biopharma, Inc. - 2022-06-15

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Ma-Weaver Jacob 2. Issuer Name and Ticker or Trading Symbol ARCA biopharma, Inc. [ ABIO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) See Footnote 1 (Last) (First) (Middle) 2261 MARKET STREET, #4307 3. Date of Earliest Transaction (MM/DD/YY) 06/15/2022 (Street) SAN FRANCISCO, CA94114 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock( 1 ) 2,580,452 I By the Funicular Fund( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (right to buy)( 1 ) $ 2.27 06/15/2022 A 12,000 ( 3 ) 06/15/2032 Common Stock 12,000( 4 ) $ 0 12,000 D Put Option( 1 ) $ 2.5 12/16/2022 12/16/2022 Common Stock 1,450,000 1,450,000 I By the Funicular Fund( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Ma-Weaver Jacob 2261 MARKET STREET #4307 SAN FRANCISCO, CA94114 X X See Footnote 1 Signatures /s/ Jacob Ma-Weaver 06/21/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4 is filed by Jacob Ma-Weaver (the "Reporting Person"). The Reporting Person, the Funicular Fund (the "Fund") and Cable Car Capital LLC ("Cable Car") may be deemed to be a member of a Section 13(d) group that may be deemed to collectively beneficially own more than 10% of the Issuer's outstanding shares of Common Stock (the "Shares"). Each of the Reporting Person, the Fund and Cable Car disclaim beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein. ( 2 )Represents securities directly owned by the Fund. Cable Car, as the general partner of the Fund, may be deemed to beneficially own the securities directly owned by the Fund. Mr. Ma-Weaver, as the Managing Member of Cable Car, may be deemed to beneficially own the securities directly owned by the Fund. ( 3 )Grant to the Reporting Person of a stock option under the 2020 Equity Incentive Plan (the Plan), vesting in 36 equal monthly installments from the date of grant, provided that the Reporting Person's continuous service to the Issuer has not been terminated as defined in or as determined under the Plan prior to such time. In the event of a change in control of the Issuer, 50% of the unvested options shall become fully and immediately vested upon the closing date of such change in control, provided, however, that on the earlier of (i) the one-year anniversary of the closing date or (ii) involuntary termination, any options that remain unvested on such earlier date shall become fully and immediately vested. ( 4 )Pursuant to the terms of the Plan, the stock option may not be transferred. Upon vesting, the Reporting Person intends on exercising the option and assigning the underlying shares to the Fund.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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