TTM TECHNOLOGIES, INC.
200 East Sandpointe, Suite 400
Santa Ana, CA 92707
Supplement to
Proxy Statement for
Annual Meeting of Stockholders
to be held on May 12, 2021
This supplement,
dated April 12, 2021, supplements the definitive proxy statement of TTM Technologies, Inc. (the Company) for its 2021 Annual Meeting of Stockholders to be held on May 12, 2021 (Proxy Statement), which was filed with
the Securities and Exchange Commission on March 16, 2021. The purpose of this supplement is solely to revise the disclosure under the heading Security Ownership of Certain Beneficial Owners and Management on page 20 of the Proxy
Statement to report certain Section 16(a) reports that were not timely filed. Accordingly, such disclosure is amended by adding the following to the end of that disclosure:
Delinquent Section 16(a) Reports
Under U.S. securities laws, directors, certain officers and persons holding more than 10% of our common stock must report their initial
ownership of our common stock and any changes in their ownership to the SEC. The SEC has designated specific due dates for these reports and we must identify in this Proxy Statement those persons who did not file these reports when due. Based solely
on our review of copies of the reports filed with the SEC and the written representations of our directors and executive officers, we believe that all reporting requirements for fiscal year 2020 were complied with by each person who at any time
during the 2020 fiscal year was a director or an executive officer or held more than 10% of our common stock, except for the following: Messrs. Alder, Klatell, Mayer and Geveden, Mses. England and Lenard, and Dr. Zakheim, each filed a Form 4
seven days late on May 15, 2020, and Mr. Franklin filed a Form 4 11 days late on May 19, 2020. In each case, the reporting person failed to timely file an award of restricted stock units. The late filings were due to an administrative
oversight by the Company as a result of personnel issues stemming from COVID-19.
Except as specifically revised
by the information contained herein, this supplement does not modify, amend or otherwise affect any of the other information set forth in the Proxy Statement. This supplement should be read with the Proxy Statement, and, from and after the date of
this supplement, any references to the Proxy Statement will be deemed to include the Proxy Statement as supplemented hereby. The Proxy Statement and our Annual Report on Form 10-K for 2020 are available to
stockholders on our website at www.ttm.com/stockholdersmeeting.