Item 2.02 Results of Operations and Financial Condition.

On May 11, 2020, Acceleron Pharma Inc. issued a press release announcing its financial results for the fiscal quarter ended March 31, 2020. 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 May 11, 2020
104       Cover Page Interactive Data File (embedded within the Inline XBRL document)



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