Adam M. Veness - 09 Nov 2021 Form 4 Insider Report for ACCELERON PHARMA INC

Role: SVP, General Counsel and Sec.
Signature: /s/ Adam M. Veness
Issuer symbol: N/A
Transactions as of: 09 Nov 2021
Net transactions value: +$132,165
Form type: 4
Filing time: 12 Nov 2021, 15:15:31 UTC
Previous filing: 22 Sep 2021
Next filing: 22 Nov 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	XLRN	Common Stock	Options Exercise	$132,165	+4,500	+24%	$29.37	23,423	09 Nov 2021	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	XLRN	Option to Purchase Common Stock	Options Exercise	$0	-4,500	-100%	$0.000000^*	0	09 Nov 2021	Common Stock	4,500	$29.37	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The shares of common stock underlying this stock option award vested as to 25% of the shares on July 14, 2015 and the remaining shares vested in equal quarterly installments over the following three years thereafter.