UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No. )
Filed by the Registrant ý | ||
Filed by a Party other than the Registrant o | ||
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| o | Preliminary Proxy Statement | |
| o | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) | |
| o | Definitive Proxy Statement | |
| ý | Definitive Additional Materials | |
| o | Soliciting Material under §240.14a-12 | |
| ACCELERON PHARMA INC. | |||||
(Name of Registrant as Specified In Its Charter) | |||||
(Name of Person(s) Filing Proxy Statement, if other than the Registrant) | |||||
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