SECURITIES AND EXCHANGE COMMISSION
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Definitive Proxy Statement
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MERRIMACK PHARMACEUTICALS, INC.
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+ Online Go to www.envisionreports.com/MACK or scan the QR code login details are located in the shaded bar below. Stockholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the Merrimack Pharmaceuticals, Inc. Stockholder Meeting to be Held on June 6, 2023. Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual stockholders meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2023 Proxy Statement and the 2022 Annual Report on Form 10-K to stockholders are available at: www.envisionreports.com/MACK Easy Online Access View your proxy materials and vote. Step 1: Go to www.envisionreports.com/MACK. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 24, 2023 to facilitate timely delivery. 2NOT + 03SXSB
Stockholder Meeting Notice The 2023 Annual Meeting of Stockholders of Merrimack Pharmaceuticals, Inc. will be held on Tuesday, June 6, 2023 at 10:00 a.m. Eastern Time, virtually via the internet at www.meetnow.global/MLJULM9. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. Proposals to be voted on at the meeting are listed below along with the Board of Directors recommendations. The Board of Directors recommend a vote FOR all the nominees listed and FOR Proposals 2 and 3: 1. Election of Directors: 01Gary L. Crocker 02Eric D. Andersen 03Noah G. Levy 04Ulrik B. Nielsen 05Ana Radeljevic 2. To ratify the selection of Marcum LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2023. 3. To approve the First Amendment to Section 382 Rights Agreement extending the term of the Section 382 Rights Agreement through December 2, 2025. PLEASE NOTE YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Heres how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. Internet Go to www.envisionreports.com/MACK. Click Cast Your Vote or Request Materials. Phone Call us free of charge at 1-866-641-4276. Email Send an email to firstname.lastname@example.org with Proxy Materials Merrimack Pharmaceuticals, Inc. in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, all requests for a paper copy of proxy materials must be received by May 24, 2023.