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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	Director	Officer	Large Shareholder	Other
1629794	New Enterprise Associates 15, L.p.	1954 Greenspring Drive Suite 600 Timonium MD 21093	No	No	Yes	No
1640031	Nea Partners 15, L.p.	1954 Greenspring Drive Suite 600 Timonium MD 21093	No	No	Yes	No
1640033	Nea 15 Gp, Llc	1954 Greenspring Drive Suite 600 Timonium MD 21093	No	No	Yes	No
1644965	Growth Equity Opportunities Iv, Llc	1954 Greenspring Drive, Suite 600 Timonium MD 21093	No	No	Yes	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	2018-02-26	1,460,209	$0.50	0	No	4	S	Direct

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

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.475 to$0.625, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities andExchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth inthis footnote (1) to this Form 4.
The shares are directly held by Growth Equity Opportunities Fund IV, LLC ("GEO IV") and indirectly held by New Enterprise Associates 15, L.P. ("NEA 15"), the sole member of GEO IV, NEA Partners 15, L.P. ("NEA Partners 15"), the sole general partner of NEA 15, NEA 15 GP, LLC ("NEA 15 GP"), the sole general partner of NEA Partners 15, and the individual managers of NEA 15 GP (NEA 15, NEA Partners 15, NEA 15 GP and the individual managers of NEA 15 GP, together, the "Indirect Reporting Persons").The individual managers of NEA 15 GP are Peter J. Barris, Forest Baskett, Anthony A. Florence, Jr., Josh Makower, David M. Mott, Jon Sakoda, Scott D. Sandell, Peter W. Sonsini and Ravi Viswanathan. The Indirect Reporting Persons disclaim beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the shares of the Issuer held by GEO IV in which the Indirect Reporting Persons have no pecuniary interest.