UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date:May 20,
ARCA Biopharma (NASDAQ:ABIO)
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Arca Biopharma, Inc. News

ARCA biopharma Announces First Quarter 2024 Financial Results and Provides Corporate Update
Thursday 25 April 2024 (2 weeks ago) • GlobeNewswire Inc.
Kuehn Law Encourages KTRA, ABIO, SWAV, and NS Investors to Contact Law Firm
Friday 5 April 2024 (1 month ago) • PR Newswire (US)
ARCA biopharma and Oruka Therapeutics Announce Merger Agreement
Wednesday 3 April 2024 (1 month ago) • GlobeNewswire Inc.
Form SC 13G/A - Statement of acquisition of beneficial ownership by individuals: [Amend]
Wednesday 7 February 2024 (3 months ago) • Edgar (US Regulatory)
Form 8-K - Current report
Tuesday 6 February 2024 (3 months ago) • Edgar (US Regulatory)
Form 8-K - Current report
Thursday 1 February 2024 (3 months ago) • Edgar (US Regulatory)
ARCA biopharma Announces 2023 Financial Results
Thursday 1 February 2024 (3 months ago) • GlobeNewswire Inc.
Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]
Thursday 1 February 2024 (3 months ago) • Edgar (US Regulatory)
Form 4 - Statement of changes in beneficial ownership of securities
Wednesday 31 January 2024 (3 months ago) • Edgar (US Regulatory)
Form 4 - Statement of changes in beneficial ownership of securities
Wednesday 31 January 2024 (3 months ago) • Edgar (US Regulatory)
Form 4 - Statement of changes in beneficial ownership of securities
Wednesday 31 January 2024 (3 months ago) • Edgar (US Regulatory)
Form 4 - Statement of changes in beneficial ownership of securities
Wednesday 31 January 2024 (3 months ago) • Edgar (US Regulatory)

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