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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
907654	Arca Biopharma Inc.	ABIO	In Vitro & In Vivo Diagnostic Substances (2835)	363855489

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1290482	A Thomas Keuer	11080 Circlepoint Road Suite 140 Westminster CO 80020	Chief Operating Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2018-02-28	410	$0.72	13,635	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Footnotes

Represents shares of common stock sold pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person with respect to the vesting of previously reported Restricted Stock Units ("RSUs") granted to the Reporting Person under the Issuer's 2013 Amended and Restated Equity Incentive Plan (the "Plan").
The price represents the weighted average purchase price for multiple transactions reported on this line. The prices of the transactions ranged from$0.7111 to $0.723. Upon request of the SEC staff, ARCA biopharma, Inc. (the "Company") or a security holder of the Company, the reporting personwill provide full information regarding the number of shares purchased at each separate price.
Includes remaining 1,207 previously reported shares issued as RSUs under the Plan that vest on 4/2/18, provided that the Reporting Person's continuous service to the Issuer has not been terminated as defined under the Plan; and 12,428 previously reported shares of common stock owned.