Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal


           Year.



Amendment to Bylaws

On June 28, 2021, the Board of Directors of ARCA biopharma, Inc. (the "Company") approved an amendment (the "By-Law Amendment") to Article II, Section 7 of the Company's amended and restated by-laws (the "By-Laws") to reduce the number of shares present at a meeting of stockholders necessary to constitute a quorum to conduct business from a majority of issued and outstanding shares to one-third (1/3) of issued and outstanding shares.

The foregoing description of the By-Law Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the By-Laws. A complete copy of the By-Laws, including the language added by the By-Law Amendment, appearing in Section 7 of Article II, is attached hereto as Exhibit 3.1.

Item 9.01. Financial Statements and Exhibits.



(d) Exhibits.




Exhibit Number          Description

3.1                       Amended and Restated Bylaws of the Registrant, as
                        amended  .
104                     Cover Page Interactive Data File. The cover page XBRL tags
                        are embedded within the inline XBRL document (contained in
                        Exhibit 101).

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