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Your Vote Counts! MANNKIND CORPORATION 2024 Annual Meeting Vote by May 14, 2024 11:59 PM ET Company Logo 1 CASPER STREET DANBURY, CT 06810 V45604-P05211 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 15, 2024. 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 May 1, 2024. 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. Vote Virtually at the Meeting* May 15, 2024 10:00 AM EDT Virtually at: For complete information and to vote, visit Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* May 15, 2024 10:00 AM EDT Virtually at: *Please check the meeting materials for any special requirements for meeting attendance. 

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 Voting Items Recommends 1.To elect the nine nominees named herein as directors to serve for the ensuing year and until their successors are elected; Nominees: 01)James S. Shannon, M.D., MRCP (UK)06) Anthony Hooper02) Michael E. Castagna, Pharm.D.07) Sabrina Kay, Ed.D.03) Ronald J. Consiglio08) Kent Kresa04) Michael A. Friedman, M.D.09) Christine Mundkur05) Jennifer Grancio For 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; 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, 2024; and For 4. 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 “Delivery Settings”. V45605-P05211