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Filing Details

Accession Number:: 0001209191-19-039550
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2019-06-28 19:25:47
Reporting Period:: 2019-06-26

Accepted Time:: 2019-06-28 19:25:47
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	Acquisiton	2019-06-26	20,000	$24.11	23,750	No	4	M	Direct
Common Stock	Acquisiton	2019-06-26	10,000	$27.97	33,750	No	4	M	Direct
Common Stock	Acquisiton	2019-06-26	7,500	$30.17	41,250	No	4	M	Direct
Common Stock	Disposition	2019-06-26	25,688	$39.16	15,562	No	4	S	Direct
Common Stock	Disposition	2019-06-26	11,812	$0.00	3,750	No	4	J	Direct
Common Stock	Acquisiton	2019-06-26	11,812	$0.00	11,812	No	4	J	Indirect	See Footnote
Common Stock	Disposition	2019-06-28	11,812	$41.17	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	J	Direct
No	4	J	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Purchase Common Stock	Disposition	2019-06-26	20,000	$0.00	20,000	$24.11
Common Stock	Option to Purchase Common Stock	Disposition	2019-06-26	10,000	$0.00	10,000	$27.97
Common Stock	Option to Purchase Common Stock	Disposition	2019-06-26	7,500	$0.00	7,500	$30.17

Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2023-12-05	No	4	M	Direct
2026-03-03	No	4	M	Direct
2027-03-02	No	4	M	Direct

Footnotes

These shares were sold to cover the exercise price of the three options reported herein.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.00 to $39.51, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (2) and (5) to this Form 4.
The Reporting Person held the options and underlying shares for the benefit of ATV Capital Management, Inc. ("ACM") pursuant to ACM's policy with respect to equity compensation in respect of director service. Pursuant to the policy, the Reporting Person assigned these shares to ACM for no additional consideration.
These securities are directly owned by ACM. The Reporting Person is a director of ACM. The Reporting Person 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.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from 40.93 to 41.37, inclusive.
The shares of common stock underlying this stock option award vested in equal quarterly installments over the first three years after the grant.
The shares of common stock underlying this stock option award vested in full on the one year anniversary of the grant date.