Item 8.01 Other Events.

On June 11, 2021, Acceleron Pharma Inc. and Bristol-Myers Squibb Company issued a press release titled "Bristol Myers Squibb and Acceleron Present First Results from Phase 2 BEYOND Study of Reblozyl® (luspatercept-aamt) in Adults with Non-Transfusion Dependent (NTD) Beta Thalassemia." 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 June 11, 2021
104                     Cover Page Interactive Data File (embedded within the Inline XBRL document)

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