Item 8.01 Other Events.

On April 5, 2021, Acceleron Pharma Inc. issued a press release titled "Acceleron Announces Clinical Trial Updates, Preclinical Presentations on Sotatercept in Pulmonary Arterial Hypertension (PAH) at the American Thoracic Society (ATS) 2021 International Conference." A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.



(d)  Exhibits.

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

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