MNKD 2018 Proxy Statement

MANNKIND CORPORATION 30930 Russell Ranch Road, Suite 301 Westlake Village, California 91362 (818) 661-5000 NOTICE OF ANNUAL MEETING OF STOCKHOLDERS To Be Held On Wednesday, May 16, 2018 Dear Stockholder: You are cordially invited to attend the Annual Meeting of Stockholders of MannKind Corporation, a Delaware corporation (“MannKind”). The meeting will be held on Wednesday, May 16, 2018 at 10:00 a.m. U.S. Pacific Time at the office of MannKind at 30930 Russell Ranch Road, Suite 301, Westlake Village, California 91362 for the following purposes: 1. To elect the seven nominees named herein as directors to serve for the ensuing year and until their successors are elected; 2. To approve the MannKind Corporation 2018 Equity Incentive Plan; 3. To approve an amendment to the MannKind Corporation 2004 Employee Stock Purchase Plan to, among other things, increase the number of shares authorized for issuance under the 2004 Employee Stock Purchase Plan by 3,000,000 shares; 4. 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; 5. 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, 2018; and 6. To transact such other business as may properly come before the meeting or any adjournment or postponement thereof. These items of business are more fully described in the proxy statement accompanying this notice. The record date for the Annual Meeting is March 19, 2018. Only stockholders of record on that date may vote at the meeting or any adjournment thereof. Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Stockholders of MannKind Corporation to be Held on May 16, 2018 at 10:00 a.m. U.S. Pacific time at the office of MannKind Corporation located at 30930 Russell Ranch Road, Suite 301, Westlake Village, California 91362. The proxy statement and annual report to stockholders are available at www.mannkindcorp.com. By Order of the Board of Directors David Thomson Corporate Vice President, General Counsel and Secretary Westlake Village, California March 29, 2018