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Your Vote Counts! MANNKIND CORPORATION 2022 Annual Meeting Vote by May 9, 2022 11:59 PM ET 1 CASPER STREET DANBURY, CT 06810 D74548-P67803 You invested in MANNKIND CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 10, 2022. Get informed before you vote View the Annual Report and Notice and Proxy Statement online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 26, 2022. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit, (2) call 1-800-579-1639 or (3) send an email to If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit Control # Vote Virtually at the Meeting* May 10, 2022 10:00 AM EDT Smartphone users Point your camera here and vote without entering a control number Virtually at: *Please check the meeting materials for any special requirements for meeting attendance. V1.1






Vote at THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Recommends Voting Items 1. Election of Directors Nominees: For 01) James S. Shannon, M.D., MRCP (UK) 02) Michael E. Castagna, Pharm.D. 03) Ronald J. Consiglio 04) Michael A. Friedman, M.D. 05) Jennifer Grancio 06) Anthony Hooper 07) Sabrina Kay 08) Kent Kresa 09) Christine Mundkur 2. To approve, on an advisory basis, the compensation of the named executive officers of MannKind, as disclosed in MannKind’s proxy statement for the Annual Meeting; and For 3. To ratify the selection by the Audit Committee of the Board of Directors of Deloitte & Touche LLP as the independent registered public accounting firm of MannKind for its fiscal year ending December 31, 2022. For NOTE: To transact such other business as may properly come before the meeting or any adjournment or postponement thereof. Prefer to receive an email instead? While voting on, be sure to click “Sign up for E-delivery”. D74549-P67803