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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
1586745	L John Knopf	128 Sidney Street Cambridge MA 02199	Ceo And President	Yes	Yes	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	2015-03-09	17,499	$40.15	30,085	No	4	S	Direct
Common Stock	Disposition	2015-03-09	2,501	$40.93	27,584	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

The reported sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.85 to $40.83, inclusive. The reporting person undertakes to provide Acceleron Pharma Inc., any security holder of Acceleron Pharma Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.89 to $40.97, inclusive. The reporting person undertakes to provide Acceleron Pharma Inc., any security holder of Acceleron Pharma Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (3) to this Form 4.