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): June 24, 2013

MITEK SYSTEMS, INC.

(Exact Name of Registrant as Specified in its Charter)

8911 Balboa Ave., Suite B, San Diego, California 92123

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (858) 309-1700

N/A

(Former name, or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 8.01.    Other Events.

On June 24, 2013, Mitek Systems, Inc. (the “Company”) issued a press release announcing the launch of an underwritten public offering of its common stock. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 9.01.    Financial Statements and Exhibits.

Forward-Looking Statements

Certain statements in this Current Report on Form 8-K may constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements relate to a variety of matters, including, without limitation, the Company’s expectations regarding the sale of shares of its common stock in the proposed public offering and other statements that are not purely statements of historical fact. These forward-looking statements are made on the basis of the current beliefs, expectations and assumptions of the management of the Company and are subject to significant risks and uncertainty. Investors are cautioned not to place undue reliance on any such forward-looking statements. All such forward-looking statements speak only as of the date they are made, and the Company undertakes no obligation to update or revise these statements, whether as a result of new information, future events or otherwise.

Factors that could cause actual results to differ materially from the forward-looking statements contained herein include, but are not limited to: risks and uncertainties related to market conditions and the satisfaction of customary closing conditions related to the proposed public offering. There can be no assurance that Mitek will be able to complete the proposed public offering on the anticipated terms, or at all. For a further discussion of risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to the business of Mitek in general, see the risk disclosures in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2012 and its subsequent quarterly reports on Form 10-Q and current reports on Form 8-K, which you may obtain for free on the SEC’s website at http://www.sec.gov.

SIGNATURES

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

Date: June 24, 2013