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 12, 2016 (October 11, 2016)

Tessera Technologies, Inc.

(Exact name of Registrant as specified in its charter)

3025 Orchard Parkway

San Jose, California 95134

(Address of Principal Executive Offices)

(408) 321-6000

(Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below):

As previously disclosed in the Current Report on Form 8-K filed on September 20, 2016 by Tessera Technologies, Inc. (“Tessera”), on September 19, 2016, Tessera entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among Tessera, DTS, Inc., a Delaware corporation, and the other parties thereto.

Also as previously disclosed in the Current Report on Form 8-K filed on September 20, 2016 by Tessera, in connection with the Merger Agreement, Tessera entered into a commitment letter (the “Commitment Letter”) dated as of September 19, 2016, with Royal Bank of Canada (“RBC”), pursuant to which, among other things, RBC committed to provide a $600,000,000 senior secured term loan facility (the “Facility”). On October 11, 2016, Tessera amended and restated the Commitment Letter (the “Amended and Restated Commitment Letter”) with RBC, Bank of Montreal (“BMO”) and BMO Capital Markets Corp. (“BMOCM”), which replaced and superseded the Commitment Letter and the commitments contemplated thereby in their entirety. Pursuant to the Amended and Restated Commitment Letter, RBC and BMO, committed to provide, in the aggregate, 100% of the Facility, subject to satisfaction of customary closing conditions. Under the terms of the Amended and Restated Commitment Letter, RBC and BMOCM will act as joint lead arrangers and joint bookrunning managers. The actual documentation governing the Facility has not been finalized, and accordingly, the actual terms may differ from the description of such terms in the Amended and Restated Commitment Letter.

The foregoing description of the Amended and Restated Commitment Letter does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Amended and Restated Commitment Letter, a copy of which is being filed as Exhibit 10.1 hereto and is incorporated herein by reference.

(d) Exhibits.

Forward Looking Statements

This Current Report on Form 8-K contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements are based on Tessera’s current expectations, estimates and projections about its business and industry, management’s beliefs and certain assumptions made by Tessera and DTS, all of which are subject to change. In addition, forward-looking statements also consist of statements involving trend analyses and statements including such words as “will,” “may,” “anticipate,” “believe,” “could,” “would,” “might,” “potentially,” “estimate,” “continue,” “plan,” “expect,” “intend,” and similar expressions or the negative of these terms or other comparable terminology that convey uncertainty of future events or outcomes are intended to identify forward-looking statements. All forward-looking statements address matters that involve risks and uncertainties, many of which are beyond our control, and are not guarantees of future results. Accordingly, there are or will be important factors that could cause actual results to differ materially from those indicated in such statements and, therefore, you should not place undue reliance on any such statements and caution must be exercised in relying on forward-looking statements. We believe that these factors include, but are not limited to, the following: 1) uncertainty as to whether Tessera will be able to enter into or consummate the proposed transaction; 2) failure to realize the anticipated benefits of the proposed transaction, including as a result of delay in completing the transaction or integrating the businesses of Tessera and DTS; 3) uncertainty as to the long-term value of DTS; 4) unpredictability and severity of natural disasters; 5) the resolution of intellectual property claims; 6) pricing trends, including Tessera’s and DTS’s ability to achieve economies of

scale; 7) Tessera’s ability to implement its business strategy; 8) retention of key executives; 9) intense competition from a number of sources; 10) future regulations and policies affecting Tessera’s and DTS’s businesses; 11) general economic and market conditions; 12) the integration of businesses Tessera may acquire or new business ventures Tessera may start; 13) the evolving legal, regulatory and tax regimes under which we operate; 14) the expected amount and timing of cost savings and operating synergies; 15) failure to receive the approval of the stockholders of DTS; 16) recent and proposed changes to U.S. patent laws, rules, and regulations; 17) continued involvement in material legal proceedings; 18) issues with Tessera’s ability to integrate acquired technologies and 19) other developments in the markets Tessera and DTS operate, as well as management’s response to any of the aforementioned factors.

The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included herein and elsewhere, including the Risk Factors included in our most recent reports on Form 10-K and Form 10-Q and other documents of Tessera and DTS on file with the Securities and Exchange Commission (the “SEC”). Our SEC filings are available publicly on the SEC’s website at www.sec.gov. Any forward-looking statements made or incorporated by reference in this material are qualified in their entirety by these cautionary statements, and there can be no assurance that the actual results or developments anticipated by us will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, us or our business or operations. Except to the extent required by applicable law, we undertake no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

Additional Information and Where to Find It

In connection with the proposed transaction, DTS has filed a preliminary proxy statement with the SEC on October 4, 2016. Additionally, DTS will file other relevant materials with the SEC in connection with the proposed acquisition of DTS by Tessera pursuant to the terms of an Agreement and Plan of Merger by and among Tessera, DTS and the other parties thereto. The materials filed or to be filed by DTS with the SEC may be obtained free of charge at the SEC’s web site at www.sec.gov. Investors and security holders of DTS are urged to read the preliminary proxy statement and the other relevant materials when they become available before making any voting or investment decision with respect to the proposed transaction because they contain or will contain important information about the transaction and the parties to the transaction.

DTS, Tessera and their respective directors, executive officers and other members of their management and employees, under SEC rules, may be deemed to be participants in the solicitation of proxies of DTS stockholders in connection with the proposed transaction. Investors and security holders may obtain more detailed information regarding the names, affiliations and interests of certain of DTS’s executive officers and directors in the solicitation by reading the proxy statement in connection with the transaction. Investors and security holders may obtain more detailed information regarding the names, affiliations and interests of certain of Tessera’s executive officers and directors in the solicitation by reading Tessera’s proxy statement for its 2016 annual meeting of stockholders. Information concerning the interests of DTS’s participants in the solicitation, which may, in some cases, be different than those of DTS’s stockholders generally, is set forth in the proxy statement relating to the transaction.

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: October 12, 2016

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