UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 10, 2017

MannKind Corporation

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (818) 661-5000

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. of Form 8-K):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 1.01 Entry into a Material Definitive Agreement.

On October 10, 2017, we entered into securities purchase agreements (the “Purchase Agreements”) with certain institutional investors and other investors (the “Purchasers”). Pursuant to the terms of the Purchase Agreements, we agreed to sell to the Purchasers in a registered offering an aggregate of 10,166,600 shares of our common stock at a purchase price of $6.00 per share. The net proceeds to us from the offering are expected to be approximately $57.7 million, after deducting placement agent fees and estimated offering expenses payable by us. The offering is expected to close on or about October 13, 2017, subject to customary closing conditions.

Pursuant to a letter agreement dated October 10, 2017 (the “Engagement Letter”), we engaged H.C. Wainwright & Co., LLC (“Wainwright”) to act as our exclusive placement agent in connection with the issuance and sale of the shares. We agreed to pay Wainwright 5.0% of the aggregate gross proceeds in the offering, except for the proceeds received from the sale of 166,600 shares issued to a foundation. We also agreed to reimburse Wainwright for its expenses in connection with the offering on a non-accountable basis in an amount equal to $150,000.

The Purchase Agreements contain customary representations, warranties and agreements by us, customary conditions to closing, indemnification obligations of us, including for liabilities under the Securities Act of 1933, as amended, termination provisions, and other obligations and rights of the parties. The representations, warranties and covenants contained in the Purchase Agreements were made only for purposes of such agreements and as of specific dates, were solely for the benefit of the parties to such agreement, and may be subject to limitations agreed upon by the contracting parties.

The offering of shares of common stock was made pursuant to our effective registration statement on Form S-3 (File No. 333-210792), previously filed with and declared effective by the Securities and Exchange Commission, and a prospectus supplement thereunder. A copy of the opinion of Cooley LLP relating to the legality of the issuance and sale of the securities in the offering is attached to this report as Exhibit 5.1.

The foregoing descriptions of the Purchase Agreements and Engagement Letter are not complete and are qualified in their entireties by reference to the full text of the form of Purchase Agreement and the Engagement Letter, copies of which are attached to this report as Exhibit 99.1 and 99.2, respectively.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

EXHIBIT INDEX

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.