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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
1413306	S Linda Grais	C/O Interwest Partners 2710 Sand Hill Road Second Floor Menlo Park CA 94025		Yes	No	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	2010-03-29	23,600	$7.98	679,098	No	4	S	Indirect	By Partnership
Common Stock	Disposition	2010-03-29	187,209	$7.30	491,889	No	4	S	Indirect	by Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Partnership
No	4	S	Indirect	by Partnership

Footnotes

The shares were sold at prices between $7.90 and $8.21 per share, resulting in an average price of $7.98 per share. Upon request, the reporting person will provide to the SEC, the issuer or securtiy holder of the issuer, full information regarding the number of shares sold at each price.
The shares were sold at prices between $6.90 and $7.89 per share, resulting in an average price of $7.30 per share. Upon request, the Reporting Person will provide to the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each price.
These shares are owned directly by InterWest Partners IX, LP. Ms. Grais, one of ARCA's directors, is a venture member of InterWest Management Partners IX, LLC, the general partner of InterWest Partners IX, LP. Ms. Grais has shared voting and dispositive powers over the shares held by InterWest Partners IX, LP, and disclaims beneficial ownership of such shares except to the extent of her pro rata partnership interest therein.