Merck, known as MSD outside the United States and Canada, today announced that its pending acquisition of Acceleron Pharma Inc. has been cleared by the competition authorities in Germany and Austria.

As previously announced on October 12, 2021, Merck commenced, through a subsidiary, a cash tender offer to purchase all outstanding shares of common stock of Acceleron, for $180 in cash, without interest and less any required tax withholding. The receipt of antitrust clearance from the competition authorities in Germany and Austria satisfies one of the conditions necessary for the consummation of the tender offer. Consummation of the tender offer remains subject to other conditions described in the tender offer statement on Schedule TO filed with the U.S. Securities and Exchange Commission (the “SEC”) on October 12, 2021, including the termination or expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (“HSR”) and the tender of shares representing at least a majority of the total number of Acceleron’s outstanding shares. As previously announced on October 29, 2021, the tender offer will expire at 5:00 p.m., Eastern Time, on November 18, 2021, unless further extended in accordance with the merger agreement and the applicable rules and regulations of the SEC. The acquisition is expected to close in the fourth quarter of 2021.

The Depositary for the tender offer is Computershare Trust Company, N.A., c/o Voluntary Corporate Actions, P.O. Box 43011, Providence, RI 02940-3011. The Information Agent for the tender offer is Innisfree M&A Incorporated, 501 Madison Avenue, 20th floor, New York, NY 10022. The tender offer materials may be obtained at no charge by directing a request by mail to Innisfree M&A Incorporated or by calling toll free at (877) 800-5195, and may also be obtained at no charge at the website maintained by the SEC at www.sec.gov.

About Merck

For over 130 years, Merck, known as MSD outside of the United States and Canada, has been inventing for life, bringing forward medicines and vaccines for many of the world’s most challenging diseases in pursuit of our mission to save and improve lives. We demonstrate our commitment to patients and population health by increasing access to health care through far-reaching policies, programs and partnerships. Today, Merck continues to be at the forefront of research to prevent and treat diseases that threaten people and animals – including cancer, infectious diseases such as HIV and Ebola, and emerging animal diseases – as we aspire to be the premier research-intensive biopharmaceutical company in the world. For more information, visit www.merck.com and connect with us on Twitter, Facebook, Instagram, YouTube and LinkedIn.

Important Information About the Tender Offer

This press release is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer to sell any shares of the common stock of Acceleron Pharma Inc. (“Acceleron”) or any other securities, nor is it a substitute for the tender offer materials described herein. A tender offer statement on Schedule TO, including an offer to purchase, a letter of transmittal and related documents, has been filed by Merck Sharp & Dohme Corp. (“Merck”) and Astros Merger Sub, Inc., a wholly owned subsidiary of Merck, with the Securities and Exchange Commission (the “SEC”), and a solicitation/recommendation statement on Schedule 14D-9 has been filed by Acceleron with the SEC.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ CAREFULLY BOTH THE TENDER OFFER MATERIALS (INCLUDING AN OFFER TO PURCHASE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER TENDER OFFER DOCUMENTS) AND THE SOLICITATION/RECOMMENDATION STATEMENT ON SCHEDULE 14D-9 REGARDING THE OFFER, AS THEY MAY BE AMENDED FROM TIME TO TIME, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION THAT INVESTORS AND SECURITY HOLDERS SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING TENDERING THEIR SECURITIES.

Investors and security holders may obtain a free copy of the Offer to Purchase, the related Letter of Transmittal, certain other tender offer documents and the Solicitation/Recommendation Statement and other documents filed with the SEC at the website maintained by the SEC at www.sec.gov or by directing such requests to Innisfree M&A Incorporated, the Information Agent for the offer, by calling toll free at (877) 800-5195. In addition, Merck and Acceleron file annual, quarterly and current reports and other information with the SEC, which are available to the public from commercial document-retrieval services and at the SEC’s website at www.sec.gov. Copies of the documents filed with the SEC by Merck may be obtained at no charge on Merck’s internet website at www.merck.com or by contacting Merck at 2000 Galloping Hill Road, Kenilworth, N.J. 07033 or (908) 423-1000. Copies of the documents filed with the SEC by Acceleron may be obtained at no charge on Acceleron’s internet website at www.acceleronpharma.com or by contacting Acceleron at 128 Sidney Street, Cambridge, MA 02139 or (617) 649-9200.