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Filing Details

Accession Number:: 0001209191-14-074229
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2014-12-10 17:05:18
Reporting Period:: 2014-12-08

Filing Date:: 2014-12-10
Accepted Time:: 2014-12-10 17:05:18
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	2014-12-08	83,143	$45.33	1,819,920	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2014-12-08	5,486	$46.02	1,814,434	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2014-12-09	8,778	$40.11	1,310,650	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

Represents 77,891 shares, 3,126 shares, 1,502 shares, 464 shares and 160 shares that were held directly, and sold, 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 price. The shares were sold at prices ranging from $45.00 to $45.58. 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 1,704,950 shares, 68,416 shares, 32,886 shares, 10,157 shares and 3,511 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively.
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 5,139 shares, 206 shares, 99 shares, 31 shares and 11 shares that were held directly, and sold, by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively.
Represents weighted average price. The shares were sold at prices ranging from $46.00 to $46.25. 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 1,699,811 shares, 68,210 shares, 32,787 shares, 10,126 shares and 3,500 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively.
Represents 4,994 shares, 2,812 shares and 972 shares that were held directly, and sold, by ATV A VII, ATV VII E and ATV 2003, respectively. The 4,994 shares sold by ATV A VII were previously reported as indirectly held through the reporting person's interests in ATV VII, ATV VII B and ATV VII C. Such shares were received by ATV A VII on December 8, 2014 by virtue of pro-rata in-kind distributions of common stock of the Issuer by ATV VII, ATV VII B and ATV VII C without consideration to their respective limited partners and ATV A VII, their general partner.
Represents weighted average price. The shares were sold at prices ranging from $40.00 to $40.51. 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 1,227,853 shares, 49,271 shares, 23,684 shares, 7,314 shares and 2,528 shares held directly by ATV VII, ATV VII B, ATV VII C, ATV VII E and ATV 2003, respectively. The shares held directly by ATV VII, ATV VII B and ATV VII C reflect the pro-rata in-kind distributions described in footnote (9) to this Form 4.