INSTRUCTION FORM
With Respect to the Offer to Purchase
All Outstanding Shares of Common Stock
of
ACCELERON PHARMA INC.
at
$180.00 Per Share, Net in Cash
Pursuant to the Offer to Purchase dated October 12, 2021
by
Astros Merger Sub, Inc.,
a wholly owned subsidiary of
MERCK SHARP & DOHME CORP.
The undersigned acknowledge(s) receipt of your letter and the enclosed Offer to Purchase, dated October 12, 2021, and the related Letter of Transmittal, in connection with the offer by Astros Merger Sub, Inc., a Delaware corporation (“Purchaser”) and wholly owned subsidiary of Merck Sharp & Dohme Corp., a New Jersey corporation (“Parent”), to purchase all of the outstanding shares of common stock, par value $0.001 per share (the “Shares”) of Acceleron Pharma Inc., a Delaware corporation (“Acceleron”), at a purchase price of $180.00 per Share, net to the seller in cash, without interest and less any applicable tax withholding, upon the terms and subject to the conditions of the Offer to Purchase, dated October 12, 2021 (as it may be amended, supplemented or otherwise modified from time to time, the “Offer to Purchase”) and the related Letter of Transmittal (as it may be amended, supplemented or otherwise modified from time to time, the “Offer to Purchase,” which, together with the Offer to Purchase, as they may be amended, supplemented or otherwise modified from time to time, collectively constitute the “Offer”).
The undersigned hereby instruct(s) you to tender to Purchaser the number of Shares indicated below (or, if no number is indicated, all Shares) which are held by you for the account of the undersigned, upon the terms and subject to the conditions set forth in the Offer. The undersigned understands and acknowledges that all questions as to validity, form and eligibility of the surrender of any certificate representing Shares submitted on the undersigned’s behalf will be determined by Purchaser and such determination shall be final and binding, subject to any judgment of any court of competent jurisdiction.
The method of delivery of this document is at the election and risk of the tendering stockholder. If delivery is by mail, then registered mail with return receipt requested, properly insured, is recommended. In all cases, sufficient time should be allowed to ensure timely delivery.
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NUMBER OF SHARES TO BE TENDERED: | | | | SIGN HERE |
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| | Shares* | | |
| | | | (Signature(s)) |
| | | | Please Type or Print Name(s) |
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| | | | Address(es) |
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| | | | Area Code and Telephone Number |
| | | | Tax Identification Number or Social Security Number |
* | Unless otherwise indicated, it will be assumed that all Shares held by us for your account are to be tendered. |