FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Rovaldi Christopher

2. Date of Event Requiring Statement (MM/DD/YYYY)
4/28/2017 

3. Issuer Name and Ticker or Trading Symbol

ACCELERON PHARMA INC [XLRN]

(Last)        (First)        (Middle)

128 SIDNEY STREET

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
SVP, Program Mgmt and Ops /

(Street)

CAMBRIDGE, MA 02139       

(City)              (State)              (Zip)
5. If Amendment, Date Original Filed (MM/DD/YYYY)

 

6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person


Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4) 		2. Amount of Securities Beneficially Owned
(Instr. 4) 		3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5) 		4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock   40967   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4) 		2. Date Exercisable and Expiration Date
(MM/DD/YYYY) 		3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4) 		4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5) 		6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Stock     (1) 3/2/2027   Common Stock   25500   $30.17   D    
Option to Purchase Common Stock     (1) 3/3/2026   Common Stock   15000   $27.97   D    
Option to Purchase Common Stock     (1) 1/8/2025   Common Stock   41000   $41.20   D    
Option to Purchase Common Stock     (1) 12/5/2023   Common Stock   23000   $24.11   D    

Explanation of Responses:
(1)  The options of registrant's common stock vest in equal quarterly installments over the first four years after the grant.

Remarks:
Exhibit List: Exhibit 24 - Power of Attorney

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Rovaldi Christopher
128 SIDNEY STREET
CAMBRIDGE, MA 02139

SVP, Program Mgmt and Ops

Signatures
/s/ John D. Quisel, as attorney-in-fact for Christopher Rovaldi 5/8/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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