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Filing Details

Accession Number:: 0001209191-14-029095
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2014-04-24 17:24:01
Reporting Period:: 2014-04-22

Filing Date:: 2014-04-24
Accepted Time:: 2014-04-24 17:24:01
SEC Url:: Form 4 Filing

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

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2014-04-22	114,746	$35.89	2,031,974	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-04-22	6,936	$35.89	122,823	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-04-23	22,349	$33.81	2,009,625	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-04-23	1,351	$33.81	121,472	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-04-24	805,905	$31.45	1,203,720	No	4	S	Indirect	See Footnote
Common Stock	Disposition	2014-04-24	48,713	$31.45	72,759	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
No	4	S	Indirect	See Footnote
No	4	S	Indirect	See Footnote
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

The price reported in Column 4 is a weighted average price. These shares were disposed of by Applied Genomic Technology Capital Fund, L.P. ("AGTC Fund") and AGTC Advisors Fund, L.P. ("AGTC Advisors") in multiple transactions on the Transaction Date at prices ranging from $35.00 to $36.86, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, and/or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (4), and (5) to this Form 4. All of the sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by AGTC Fund and AGTC Advisors on December 16, 2013.
Represents shares held by 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 Venture 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. NewcoGen Group, Inc. ("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 Venture 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..
The price reported in Column 4 is a weighted average price. These shares were disposed of by AGTC Fund and AGTC Advisors in multiple transactions on the Transaction Date at prices ranging from $33.15 to $35.26, inclusive.
The price reported in Column 4 is a weighted average price. These shares were disposed of by AGTC Fund and AGTC Advisors in multiple transactions on the Transaction Date at prices ranging from $30.50 to $33.52, inclusive.