Item 2.02 Results of Operations and Financial Condition.

On August 5, 2021, Acceleron Pharma Inc. issued a press release announcing its financial results for the fiscal quarter ended June 30, 2021. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information contained in this Item, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed "filed" for any purpose, and shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, regardless of any general incorporation language in any such filing.

Item 9.01 Financial Statements and Exhibits.



  (d)  Exhibits.

 Exhibit Number                                         Description of Exhibit
99.1                      Press Release of Acceleron Pharma Inc. dated August 5, 2021
104                     Cover Page Interactive Data File (embedded within the Inline XBRL document)


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