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Filing Details

Accession Number:: 0001209191-14-043422
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2014-06-24 22:05:15
Reporting Period:: 2014-06-20

Filing Date:: 2014-06-24
Accepted Time:: 2014-06-24 21:05:15
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
1291804	Jean George	C/O Advanced Technology Venture 500 Boylston Street, Suite 1380 Boston MA 02116		Yes	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2014-06-20	1,457	$35.02	1,937,574	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2014-06-23	13,618	$35.27	1,923,956	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2014-06-24	10,402	$35.03	1,913,554	No	4	S	Indirect	See footnotes

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

Footnotes

Series of transactions pursuant to Rule 10b5-1 Plans on behalf of each entity each of which was entered into on February 28, 2014 and amended on May 22, 2014.
Represents 1,365 shares, 55 shares, 26 shares, 8 shares and 3 shares that were held directly by Advanced Technology Ventures VII, L.P. ("ATV VII"), Advanced Technology Ventures VII (B), L.P. ("ATV VII B"), Advanced Technology Ventures VII (C), L.P. ("ATV VII C"), ATV Entrepreneurs VII, L.P. ("ATV VII E") and ATV Alliance 2003, L.P. ("ATV 2003"), respectively.
Represents weighted average sales price. The shares were sold at prices ranging from $35.00 to $35.07. The Reporting Person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price.
ATV Associates VII, L.L.C. ("ATV A VII") is the general partner of ATV VII, ATV VII B, ATV VII C and ATV VII E and exercises voting and dispositive authority over the shares held by ATV VII, ATV VII B, ATV VII C and ATV VII E. Jean George is a managing director of ATV A VII and exercises voting and dispositive decisions of ATV A VII collectively with each of four other managing directors. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein.
ATV Alliance Associates, L.L.C. ("ATV Alliance LLC") is the general partner of ATV 2003 and exercises voting and dispositive authority over the shares held by ATV 2003. Voting and dispositive decisions of ATV Alliance LLC are made by Ms. George. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein.
Represents 1,815,175 shares, 72,839 shares, 35,011 shares, 10,814 shares and 3,735 shares that are held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein.
Represents 12,759 shares, 512 shares, 246 shares, 76 shares and 25 shares that were held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively.
Represents weighted average sales price. The shares were sold at prices ranging from $35.00 to $35.90. The Reporting Person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price.
Represents 1,802,416 shares, 72,327 shares, 34,765 shares, 10,738 shares and 3,710 shares that are held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein.
Represents 9,746 shares, 391 shares, 188 shares, 58 shares and 19 shares that were held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively.
Represents weighted average sales price. The shares were sold at prices ranging from $35.00 to $35.25. The Reporting Person will provide upon request, to the SEC, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price.
Represents 1,792,670 shares, 71,936 shares, 34,577 shares, 10,680 shares and 3,691 shares that are held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively. Ms. George disclaims beneficial ownership of these securities and this report shall not be deemed an admission that she is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of her pecuniary interest therein.