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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1280600	Acceleron Pharma Inc	XLRN	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1214938	F Kevin Mclaughlin	128 Sidney Street Cambridge MA 02139	Svp, Cfo And Treasurer	No	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
Common Stock	Acquisiton	2020-12-09	548	$41.20	11,764	No	4	M	Direct
Common Stock	Acquisiton	2020-12-09	400	$27.97	12,164	No	4	M	Direct
Common Stock	Acquisiton	2020-12-09	1,051	$30.17	13,215	No	4	M	Direct
Common Stock	Acquisiton	2020-12-09	1,873	$40.61	15,088	No	4	M	Direct
Common Stock	Disposition	2020-12-09	3,872	$125.03	11,216	No	4	S	Direct
Common Stock	Acquisiton	2020-12-10	100	$41.20	11,316	No	4	M	Direct
Common Stock	Acquisiton	2020-12-10	200	$27.97	11,516	No	4	M	Direct
Common Stock	Acquisiton	2020-12-10	100	$30.17	11,616	No	4	M	Direct
Common Stock	Acquisiton	2020-12-10	100	$40.61	11,716	No	4	M	Direct
Common Stock	Disposition	2020-12-10	500	$125.12	11,216	No	4	S	Direct
Common Stock	Acquisiton	2020-12-11	3,100	$41.20	14,316	No	4	M	Direct
Common Stock	Disposition	2020-12-11	3,100	$125.00	11,216	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-09	548	$0.00	548	$41.20
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-09	400	$0.00	400	$27.97
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-09	1,051	$0.00	1,051	$30.17
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-09	1,873	$0.00	1,873	$40.61
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-10	100	$0.00	100	$41.20
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-10	200	$0.00	200	$27.97
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-10	100	$0.00	100	$30.17
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-10	100	$0.00	100	$40.61
Common Stock	Option to Purchase Common Stock	Disposition	2020-12-11	3,100	$0.00	3,100	$41.20

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,452	2025-01-08	No	4	M	Direct
7,900	2026-03-03	No	4	M	Direct
30,249	2027-03-02	No	4	M	Direct
28,952	2028-03-01	No	4	M	Direct
10,352	2025-01-08	No	4	M	Direct
7,700	2026-03-03	No	4	M	Direct
30,149	2027-03-02	No	4	M	Direct
28,852	2028-03-01	No	4	M	Direct
7,252	2025-01-08	No	4	M	Direct

Footnotes

The reported transactions 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 $125.00 to $125.27 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 shares of common stock underlying this stock option award vested in equal quarterly installments over the four years after the grant.
The shares of common stock underlying this stock option award vested in equal quarterly installments over the four years after January 1, 2016.
The shares of common stock underlying this stock option award vest in equal quarterly installments over the four years after January 1, 2017.
The shares of common stock underlying this stock option award vest in equal quarterly installments over the four years after January 1, 2018.