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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1280600	Acceleron Pharma Inc	XLRN	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1255927	Jr M Edwin Kania	C/O Flagship Ventures, 1 Memorial Drive Cambridge MA 02142		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	2014-05-05	202,879	$42.86	1,000,841	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-05-05	12,263	$42.86	60,496	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,867	Direct

Footnotes

Represents shares held by Applied Genomic Technology Capital Fund, L.P. ("AGTC Fund"). NewcoGen Group, Inc. ("NewcoGen Inc.") is the general partner of AGTC Partners, L.P., which is the general partner of AGTC Fund. NewcoGen Inc. is a wholly-owned subsidiary of Flagship Ventures Management, Inc. Noubar B. Afeyan, Ph.D. and Mr. Kania are the directors of Flagship Ventures Management, Inc. and, as such, have shared voting and dispositive power over all shares held by AGTC Fund. Each of Mr. Kania and Dr. Afeyan disclaim beneficial ownership over the shares held by AGTC Fund except to the extent of his pecuniary interest therein.
Represents shares held by AGTC Advisors Fund, L.P. ("AGTC Advisors"). NewcoGen Inc. is the general partner of AGTC Partners, L.P., which is the general partner of AGTC Advisors. NewcoGen Inc. is a wholly-owned subsidiary of Flagship Ventures Management, Inc. Noubar B. Afeyan, Ph.D. and Mr. Kania are the directors of Flagship Ventures Management, Inc. and, as such, have shared voting and dispositive power over all shares held by AGTC Advisors. Each of Mr. Kania and Dr. Afeyan disclaim beneficial ownership over the shares held by AGTC Advisors except to the extent of his pecuniary interest therein.