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As filed with the Securities and Exchange Commission on November 5, 2014

Registration No. 333-199559

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

AMENDMENT NO. 1

TO

FORM S-4

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

TTM TECHNOLOGIES, INC.

(Exact Name of Registrant as Specified in its Charter)

1665 Scenic Avenue, Suite 250

Costa Mesa, CA 92626

(714) 327-3000

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

Thomas T. Edman

President and Chief Executive Officer

TTM Technologies, Inc.

1665 Scenic Avenue, Suite 250

Costa Mesa, CA 92626

(714) 327-3000

(Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent for Service)

Copies to:

Approximate date of commencement of proposed sale of the securities to the public: As soon as practicable on or after the effective date of this registration statement after all other conditions to the merger described herein have been satisfied or waived.

If the securities being registered on this Form are to be offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

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If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer)  ¨

Exchange Act Rule 14d-1(d) (Cross-Border Third-Party Tender Offer)  ¨

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to Section 8(a), may determine.

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The information contained in this proxy statement/prospectus is subject to completion and may be amended. A registration statement relating to these securities has been filed with the United States Securities and Exchange Commission. TTM Technologies, Inc. may not sell these securities nor may offers to buy be accepted prior to the time the registration statement becomes effective. This proxy statement/prospectus is not an offer to sell these securities and TTM Technologies, Inc. is not soliciting an offer to buy these securities, nor shall there be any sale of these securities, in any jurisdiction in which such offer, solicitation, or sale is not permitted or would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

PRELIMINARY—SUBJECT TO COMPLETION, DATED NOVEMBER 5 , 2014

LETTER TO STOCKHOLDERS OF VIASYSTEMS GROUP, INC.

November [—], 2014

Dear Viasystems Stockholder:

You are cordially invited to attend a special meeting of the stockholders of Viasystems Group, Inc., a Delaware corporation (“Viasystems”), which is being held at 7:30 a.m. (Central Time) on December 16, 2014 at the Sheraton Clayton Plaza Hotel, located at 7730 Bonhomme Avenue, St. Louis, Missouri 63105 (the “Viasystems Special Meeting”).

Viasystems, TTM Technologies, Inc., a Delaware corporation (“TTM”), and Vector Acquisition Corp., a Delaware corporation and a wholly owned subsidiary of TTM (“Merger Sub”), have entered into an Agreement and Plan of Merger, dated as of September 21, 2014 (the “Merger Agreement”), pursuant to which, among other things, Merger Sub will be merged with and into Viasystems, and Viasystems will continue as the surviving corporation and a wholly owned subsidiary of TTM (the “Merger”).

If the Merger is consummated, each share of common stock, $0.01 par value per share, of Viasystems (“Viasystems common stock”) then outstanding will be cancelled and automatically converted into the right to receive (1) $11.33 in cash and (2) 0.706 of a share of the common stock, $0.001 par value per share, of TTM (“TTM common stock”). No fractional shares will be issued in the Merger. Immediately following consummation of the Merger, former Viasystems stockholders will own approximately 15.9% of the total amount of outstanding shares of TTM common stock. You should obtain current stock price quotations for TTM common stock and Viasystems common stock before deciding how to vote with respect to the adoption of the Merger Agreement. TTM common stock is listed for trading on the Nasdaq Global Select Market under the symbol “TTMI,” and Viasystems common stock is listed for trading on the Nasdaq Global Market under the symbol “VIAS.”

At the Viasystems Special Meeting, Viasystems stockholders will be asked to adopt the Merger Agreement and approve other related proposals. The accompanying document is a proxy statement of Viasystems and a prospectus of TTM and provides you with information about Viasystems, TTM, the Merger, documents related to the Merger, the Viasystems Special Meeting, and other related matters. Viasystems and TTM encourage you to carefully read the proxy statement/prospectus in its entirety, including the annexes and the documents incorporated by reference therein.

You may also obtain more information about Viasystems and TTM from the documents that Viasystems and TTM have filed with the Securities and Exchange Commission.

For a discussion of risk factors you should consider in evaluating the Merger Agreement you are being asked to adopt, see “Risk Factors” beginning on page 27 of the accompanying proxy statement/prospectus.

Your vote is very important. Whether or not you plan to attend the Viasystems Special Meeting, please vote as soon as possible by following the instructions in this proxy statement/prospectus to make sure that your shares are represented at the Viasystems Special Meeting. Your failure to vote your shares at the Viasystems Special Meeting will have the same effect as a vote against the proposal to adopt the Merger Agreement. The board of directors of Viasystems unanimously recommends that you vote “FOR” the adoption of the Merger Agreement and “FOR” the other proposals described in this proxy statement/prospectus.

We appreciate your continued support and interest in Viasystems.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED THE MERGER OR OTHER TRANSACTIONS DESCRIBED IN THE ACCOMPANYING PROXY STATEMENT/PROSPECTUS OR THE SECURITIES TO BE ISSUED PURSUANT TO THE MERGER UNDER THE ACCOMPANYING PROXY STATEMENT/PROSPECTUS NOR HAVE THEY DETERMINED IF THE ACCOMPANYING PROXY STATEMENT/PROSPECTUS IS ACCURATE OR ADEQUATE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

The accompanying proxy statement/prospectus is dated November [—], 2014 and is first being mailed to Viasystems stockholders on or about November 10, 2014.

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VIASYSTEMS GROUP, INC.

101 South Hanley Road

St. Louis, Missouri 63105

Notice of Special Meeting of Stockholders

to be Held on December 16, 2014

To the Stockholders of Viasystems Group, Inc.:

A special meeting of stockholders of Viasystems Group, Inc., a Delaware corporation (“Viasystems”), will be held at 7:30 a.m. (Central Time) on December 16, 2014 at the Sheraton Clayton Plaza Hotel, located at 7730 Bonhomme Avenue, St. Louis, Missouri 63105 (the “Viasystems Special Meeting”). At the Viasystems Special Meeting, stockholders will be asked to consider and take the following actions:

The above matters are more fully described in the accompanying proxy statement of Viasystems and prospectus of TTM, which provides you with information about Viasystems, TTM, the Merger, documents related to the Merger, the Viasystems Special Meeting, and other related matters. The accompanying proxy statement/prospectus also includes, as Annex A, a copy of the Merger Agreement. The record date for the Viasystems Special Meeting is November 6, 2014. Only stockholders of record at the close of business on that date are entitled to notice of, and may vote at, the Viasystems Special Meeting or any adjournment thereof. Viasystems and TTM encourage you to carefully read the accompanying proxy statement/prospectus in its entirety, including the annexes and the documents incorporated by reference therein.

The approval of the proposal to adopt the Merger Agreement requires the affirmative vote of the holders of a majority of the outstanding shares of Viasystems common stock entitled to vote at the Viasystems Special Meeting. The advisory approval of the compensation that will or may be paid by Viasystems to its named executive officers in connection with the Merger requires the affirmative vote of the holders of a majority of the shares of Viasystems common stock present, in person or by proxy, and entitled to vote at the Viasystems Special Meeting, although such vote will not be binding on Viasystems. The proposal to approve any proposal made by the Chairman of the Viasystems Board to adjourn the Viasystems Special Meeting requires the affirmative vote of the holders of a majority of the shares of Viasystems common stock present, in person or by proxy, and entitled to vote at the Viasystems Special Meeting. The Viasystems Board unanimously recommends that you vote “FOR” each of these proposals.

By Order of the Board of Directors,

          [—]

Daniel J. Weber

Secretary

November [—], 2014

St. Louis, Missouri

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REFERENCES TO ADDITIONAL INFORMATION

This proxy statement/prospectus incorporates by reference important business and financial information about each of TTM Technologies, Inc. (“TTM”) and Viasystems Group, Inc. (“Viasystems”) from documents that each company has filed or will file with the Securities and Exchange Commission (“SEC”) but that are not being included in or delivered with this proxy statement/prospectus. This information is available to you without charge upon your written or oral request. You may read and copy the documents incorporated by reference in this proxy statement/prospectus and other information about each of TTM and Viasystems that is filed with the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, DC 20549. You can also obtain such documents free of charge through the SEC’s website, www.sec.gov, or by requesting them in writing or by telephone from the appropriate company at the following addresses and telephone numbers:

If you would like to request any documents, please do so by December 9, 2014 in order to receive them before the Viasystems Special Meeting.

For additional information on documents incorporated by reference in this proxy statement/prospectus, see “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus. Please note that information contained on the websites of TTM or Viasystems is not incorporated by reference in, nor considered to be part of, this proxy statement/prospectus.

ABOUT THIS PROXY STATEMENT/PROSPECTUS

TTM has supplied all information contained in or incorporated by reference into this proxy statement/prospectus relating to TTM. Viasystems has supplied all information contained in or incorporated by reference into this proxy statement/prospectus relating to Viasystems. TTM and Viasystems have both contributed to information relating to the Merger to which this proxy statement/prospectus relates.

You should rely only on the information contained in or incorporated by reference into this proxy statement/prospectus. No one has been authorized to provide you with information that is different from that contained in or incorporated by reference into this proxy statement/prospectus. This proxy statement/prospectus is dated November [—], 2014, and is based on information as of such date or such other date as may be noted. You should not assume that the information contained in this proxy statement/prospectus is accurate as of any other date. You should not assume that the information contained in any document incorporated or deemed to be incorporated by reference herein is accurate as of any date other than the date of such document. Any statement contained in a document incorporated or deemed to be incorporated by reference into this proxy statement/prospectus will be deemed to be modified or superseded to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference into this proxy statement/prospectus modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this proxy statement/prospectus. Neither the mailing of this proxy statement/prospectus to the stockholders of Viasystems nor the taking of any actions contemplated hereby by TTM or Viasystems at any time will create any implication to the contrary.

This proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction in which or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction.

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QUESTIONS AND ANSWERS

The board of directors (the “Viasystems Board”) of Viasystems Group, Inc. (“Viasystems”) is soliciting proxies from its stockholders to vote at a special meeting of Viasystems stockholders, to be held at 7:30 a.m. (Central Time) on December 16, 2014 at the Sheraton Clayton Plaza Hotel, located at 7730 Bonhomme Avenue, St. Louis, Missouri 63105 (the “Viasystems Special Meeting”), and any adjournment or postponement of the Viasystems Special Meeting.

The questions and answers below highlight selected information from this proxy statement/prospectus and are intended to briefly address some commonly asked questions about, among other things, (1) the Agreement and Plan of Merger, dated September 21, 2014 (the “Merger Agreement”), by and among Viasystems, TTM Technologies, Inc., a Delaware corporation (“TTM”), and Vector Acquisition Corp., a Delaware corporation and a wholly owned subsidiary of TTM (“Merger Sub”), (2) the proposed merger of Merger Sub with and into Viasystems (the “Merger”), pursuant to which the separate corporate existence of Merger Sub will cease and Viasystems will survive the Merger as a wholly owned subsidiary of TTM (following the Merger, Viasystems is referred to herein as the “surviving corporation”), and (3) the Viasystems Special Meeting, where the Viasystems stockholders will be asked to consider and vote on several proposals relating to the adoption of the Merger Agreement and related transactions.

The following questions and answers do not contain all of the information that is important to you. You should carefully read this proxy statement/prospectus in its entirety, including the annexes and the documents incorporated by reference therein, to fully understand the matters to be acted upon and the voting procedures for the Viasystems Special Meeting. You may obtain the information incorporated by reference into this proxy statement/prospectus without charge by following the instructions under “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

In order to consummate the Merger, Viasystems stockholders must vote to adopt the Merger Agreement. Adoption of the Merger Agreement requires the approval of the holders of a majority of the outstanding shares of Viasystems common stock entitled to vote on such matter.

This proxy statement/prospectus is being delivered to you as both as a proxy statement of Viasystems and a prospectus of TTM. It is a proxy statement because the Viasystems Board is soliciting proxies from its stockholders to vote on the adoption of the Merger Agreement at the Viasystems Special Meeting as well as the other matters set forth in the notice of the Viasystems Special Meeting and described in this proxy statement/prospectus, and your proxy will be used at the Viasystems Special Meeting or at any adjournment or postponement thereof. It is a prospectus because TTM will issue TTM common stock to Viasystems stockholders in connection with the Merger. On or about November 10, 2014, Viasystems began to deliver printed versions of these materials to its stockholders of record at the close of business on November 6, 2014.

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The Viasystems Board unanimously recommends that the Viasystems stockholders vote “FOR” each of these proposals. For a discussion of the reasons for this recommendation, see “The Merger—Recommendation of the Viasystems Board of Directors and Viasystems’ Reasons for the Merger” beginning on page 85 of this proxy statement/prospectus.

You will not own any shares in the surviving corporation after the consummation of the Merger. See “The Merger Agreement” beginning on page 124 of this proxy statement/prospectus.

The implied value of the stock portion of the Merger Consideration will fluctuate as the market price of TTM common stock fluctuates. You should obtain current stock price quotations for TTM common stock and Viasystems common stock before deciding how to vote with respect to the adoption of the Merger Agreement. TTM common stock is listed for trading on the Nasdaq Global Select Market (“NASDAQ”) under the symbol “TTMI” and Viasystems common stock is listed for trading on the Nasdaq Global Market under the symbol “VIAS.”

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See “The Merger—Recommendation of the Viasystems Board of Directors and Viasystems’ Reasons for the Merger” beginning on page 85 of this proxy statement/prospectus.

As more fully described in this proxy statement/prospectus and in the Merger Agreement, the completion of the Merger depends on a number of conditions being satisfied or, where legally permissible, waived. These conditions include, among others, the adoption of the Merger Agreement by the holders of a majority of the outstanding shares of Viasystems common stock entitled to vote on such matter, the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, the receipt of certain foreign antitrust approvals under applicable antitrust and competition laws of the People’s Republic of China (“China”), Germany, and Estonia, the receipt of approval from the Committee on Foreign Investment in the United States, the effectiveness of the registration statement (of which this proxy statement/prospectus is a part) relating to the issuance of the shares of TTM common stock to be issued in the Merger, and the absence of any law or regulation that prohibits the completion of the Merger. Each party’s obligation to consummate the Merger is also subject to the material accuracy of the representations and warranties of the other party in the Merger Agreement, compliance in all material respects with covenants of the other party in the Merger Agreement, and the absence of a material adverse effect (as defined in the Merger Agreement) on the other party. The Merger Agreement does not include a financing condition.

For more information regarding the amount and timing of any income, gain, or loss with respect to the Merger, see “Material U.S. Federal Income Tax Consequences” beginning on page 164 of this proxy statement/prospectus.

Because individual circumstances may differ, all Viasystems stockholders should contact their own tax advisors to determine the particular tax consequences to them of the exchange of Viasystems common stock pursuant to the Merger, including the application and effect of any state, local, foreign, or other tax laws.

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As of November 6, 2014, the record date for determining stockholders of Viasystems entitled to vote at the Viasystems Special Meeting, there were [—] shares of Viasystems common stock outstanding and entitled to vote at the Viasystems Special Meeting, held by approximately [—] holders of record.

Proposal 2 requires the affirmative vote of the holders of a majority of the shares present, in person or by proxy, and entitled to vote at the Viasystems Special Meeting.

Proposal 3 requires the affirmative vote of the holders of a majority of the shares present, in person or by proxy, and entitled to vote at the Viasystems Special Meeting.

In connection with the execution of the Merger Agreement, certain Viasystems stockholders entered into voting agreements with TTM, pursuant to which they agreed to vote, and granted TTM an irrevocable proxy to vote, their shares of Viasystems common stock in favor of the adoption of the Merger Agreement. As of November 6, 2014, the record date for determining Viasystems stockholders entitled to vote at the Viasystems Special Meeting, these stockholders collectively beneficially owned approximately 67% of the outstanding shares of Viasystems common stock. If the Merger Agreement is terminated in accordance with its terms, these voting agreements will also terminate. See “The Voting Agreements” beginning on page 154 of this proxy statement/prospectus.

Approval of the proposals relating to the advisory vote on certain compensation arrangements and possible adjournment of the Viasystems Special Meeting requires the affirmative vote of the holders of a majority of the shares present, in person or by proxy, and entitled to vote at the Viasystems Special Meeting (assuming a quorum of stockholders is represented in person or by proxy). As a result, if you do not vote your shares of Viasystems common stock, this will have no effect on these proposals. However, abstentions will have the same effect as a vote against these proposals.

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Please note that use of cameras, recording devices and other electronic devices will not be permitted at the Viasystems Special Meeting.

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Regardless of whether you intend to attend the Viasystems Special Meeting, you are encouraged to vote your shares of Viasystems common stock as promptly as possible. Voting your shares will not impact your ability to attend the Viasystems Special Meeting.

Voting by Mail. By signing the proxy card and returning it in the enclosed prepaid and addressed envelope, you are authorizing the individuals named on the proxy card to vote your shares at the Viasystems Special Meeting in the manner you indicate. You are encouraged to sign and return the proxy card even if you plan to attend the Viasystems Special Meeting so that your shares will be voted if you are ultimately unable to attend the Viasystems Special Meeting.

Voting by Telephone or over the Internet. To vote by telephone or over the Internet, please follow the instructions included on your proxy card. If you vote by telephone or over the Internet, you do not need to complete and mail a proxy card.

Voting in Person at the Meeting. If your shares are registered directly in your name, you are considered the stockholder of record and you have the right to vote in person at the Viasystems Special Meeting. If you attend the Viasystems Special Meeting and plan to vote in person, you will be provided with a ballot at the Viasystems Special Meeting.

Voting Instructions for Viasystems Retirement Savings Plan Participants. If you are a participant in Viasystems’ Retirement Savings Plan (the “401(k) Plan”) and a portion of your 401(k) Plan account is invested in shares of Viasystems common stock, your proxy represents all shares you own through the 401(k) Plan. Your proxy will serve as voting instructions for the trustee of the 401(k) Plan who will vote your shares on your behalf. If you own shares through the 401(k) Plan and you do not instruct the 401(k) Plan trustee on how to vote your shares, the investment committee for the 401(k) Plan will vote those shares in its sole discretion. We encourage you to provide instructions to the trustee regarding the voting of your shares. Instructions provided by telephone or the Internet must be received by 11:59 p.m., Eastern Time, on December 15, 2014.

If you are a Viasystems stockholder of record, you may revoke your proxy at any time before it is voted at the Viasystems Special Meeting. To revoke your proxy, you must:

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If you are the beneficial owner of shares held in “street name” by a brokerage firm, bank, or other nominee, you should follow the instructions of your bank, broker, or other nominee regarding the revocation of proxies.

If the Viasystems Special Meeting is postponed or adjourned, it will not affect the ability of stockholders of record on the record date to exercise their voting rights or to revoke any previously granted proxy using the methods described above.

D.F. King & Co., Inc.

48 Wall Street

New York, NY 10005

Stockholders may call toll-free: (866) 521-4487

Banks and Brokers may call collect: (212) 269-5550

Email: info@dfking.com

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RISK FACTORS

In addition to the other information included in and incorporated by reference into this proxy statement/prospectus, you should carefully read and consider the following risk factors in evaluating the proposals to be voted on at the Viasystems Special Meeting and in determining whether to vote for adoption of the Merger Agreement. If the Merger Agreement is adopted by Viasystems stockholders and all of the other conditions to the Merger are satisfied or waived, and the Merger is consummated, holders of Viasystems common stock will become holders of TTM common stock and will be subject to the risks and uncertainties of holders thereof. Please also refer to the additional risk factors of each of TTM and Viasystems identified in the periodic reports and other documents incorporated by reference into this proxy statement/prospectus because these risk factors may affect the operations and financial results of the combined company. See “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

Risks Related to the Merger

Because the market price of TTM common stock will fluctuate, Viasystems stockholders cannot be certain of the value of the Merger Consideration that they will be entitled to receive in the Merger.

Upon the consummation of the Merger, each outstanding share of Viasystems common stock will be converted into the right to receive the Merger Consideration, which consists of (1) $11.33 in cash, without interest and (2) 0.706 of a share of TTM common stock. The 0.706 exchange ratio is fixed and will not be adjusted for changes in the market price of either Viasystems common stock or TTM common stock. The market value of the TTM common stock that Viasystems stockholders will be entitled to receive in the Merger could vary significantly from the market value of TTM common stock on the date of the announcement of the execution of the Merger Agreement, the date that this proxy statement/prospectus was mailed to Viasystems stockholders, or the date of the Viasystems Special Meeting. For example, the closing sale price of TTM common stock on September 19, 2014, the last trading day prior to the public announcement of the Merger Agreement, was $7.27 per share and, therefore, if the Merger had been consummated on that date, the value of the Merger Consideration, including the $11.33 in cash consideration, would have been $16.46. On November 4, 2014, the latest practicable date prior to the date of this proxy statement/prospectus, the closing sale price of TTM common stock was $6.94 per share and, therefore, if the Merger had been consummated on that date, the value of the Merger Consideration, including the $11.33 in cash consideration, would have been $16.23. Moreover, the market value of TTM common stock will likely fluctuate after the consummation of the Merger. See “Comparative Per Share Data” and “Comparative Market Value of Common Stock” beginning on pages 56 and 57, respectively, of this proxy statement/prospectus.

The Merger Agreement does not provide for any termination right by TTM, Viasystems, or Merger Sub based solely on changes in the price or trading volume of TTM common stock or Viasystems common stock. Fluctuations in the market price of TTM common stock could result from changes in the business, operations, or prospects of Viasystems or TTM prior to the consummation of the Merger or the combined company following the completion of the Merger, regulatory considerations, general market and economic conditions, and other factors both within and beyond the control of Viasystems or TTM.

The issuance of TTM common stock in connection with the Merger could decrease the market price of TTM common stock.

Upon the consummation of the Merger, TTM expects to issue approximately 15.3 million shares of TTM common stock, or approximately 19% of the number of shares of TTM common stock outstanding as of September 19, 2014, the last trading day prior to the public announcement of the Merger Agreement, to Viasystems stockholders in the Merger. Immediately following the consummation of the Merger, former Viasystems stockholders will own approximately 15.9% of the total amount of outstanding shares of TTM common stock. The issuance of TTM common stock in the Merger may result in fluctuations in the market price of TTM common stock, including a stock price decline.

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The shares of TTM common stock to be received by Viasystems stockholders as a result of the Merger will have different rights from the shares of Viasystems common stock.

Upon consummation of the Merger, Viasystems stockholders will become TTM stockholders, and their rights as stockholders will be governed by the TTM Charter and the TTM Bylaws. Certain of the rights associated with TTM common stock are different from, and may be viewed as less favorable than, the rights associated with Viasystems common stock. See “Comparison of Rights of Holders of TTM Common Stock and Viasystems Common Stock” beginning on page 170 of this proxy statement/prospectus for a discussion of the different rights associated with TTM common stock.

TTM, Viasystems, and Merger Sub may be unable to satisfy the conditions to the Merger and the Merger may not be consummated.

Consummation of the Merger is subject to various closing conditions, including, among other things, (1) the adoption of the Merger Agreement by Viasystems stockholders, (2) the expiration or termination of the applicable waiting period under the HSR Act and receipt of certain other required antitrust approvals under applicable antitrust and competition laws of China, Germany and Estonia, (3) the absence of any legal restraints or prohibitions on the consummation of the Merger, and (4) receipt of the CFIUS Approval. The obligation of each party to consummate the Merger is also conditioned upon the other party’s representations and warranties being true and correct (subject to certain materiality exceptions), the other party having performed in all material respects its obligations under the Merger Agreement, and the other party not having suffered a material adverse effect (as defined in the Merger Agreement).

These and other conditions to the consummation of the Merger may fail to be satisfied. In addition, satisfying the conditions to the Merger may take longer, and could cost more, than Viasystems and TTM expect. For a more complete summary of the conditions that must be satisfied or waived prior to consummation of the Merger, see the section entitled “The Merger Agreement—Conditions to the Merger” beginning on page 127 of this proxy statement/prospectus. The satisfaction of all of the required conditions could delay the completion of the Merger for a significant period of time or prevent it from occurring. Any delay in completing the Merger could cause TTM not to realize some or all of the benefits that TTM expects to achieve if the Merger is successfully consummated within its expected timeframe. Further, there can be no assurance that the conditions to the Merger will be satisfied or waived or that the Merger will be consummated. See “—Failure to consummate the Merger could negatively impact the stock price and the future business and financial results of TTM and Viasystems.”

Viasystems must obtain approval of its stockholders to consummate the Merger, which, if delayed or not obtained, may jeopardize or delay the consummation of the Merger.

The Merger is conditioned on the adoption of the Merger Agreement by the affirmative vote of the holders of a majority of the outstanding shares of Viasystems common stock entitled to vote thereon. If the Viasystems stockholders do not adopt the Merger Agreement, then Viasystems and TTM cannot consummate the Merger. However, if the Merger Agreement is terminated by either Viasystems or TTM because the Viasystems stockholders have not adopted the Merger Agreement at the Viasystems Special Meeting, including any adjournment or postponement thereof, then in certain circumstances Viasystems may be required to pay up to a maximum of $4 million of all documented out-of-pocket costs and expenses incurred by TTM and Merger Sub in connection with the Merger Agreement, the Merger, and the other transactions and agreements in connection therewith.

Regulatory approvals that are required to consummate the Merger may not be received, may take longer than expected, or may impose conditions that are not presently anticipated.

Under the provisions of the HSR Act, the Merger may not be consummated until notification and report forms have been filed with the Antitrust Division of the DOJ and the FTC and the expiration of a 30 calendar day

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waiting period (unless the waiting period is set to expire on a weekend or federal holiday, in which case the waiting period is automatically extended until 11:59 p.m. of the next business day), or the early termination of

that waiting period, following the parties’ filing of their respective notification and report forms. If the Antitrust Division of the DOJ or the FTC issues a Request for Additional Information and Documentary Material prior to the expiration of the waiting period, the parties must observe a second 30 calendar day waiting period (unless the waiting period is set to expire on a weekend or federal holiday, in which case the waiting period is automatically extended until 11:59 p.m. of the next business day), which would begin to run only after both parties have substantially complied with the request for information, unless the waiting period is terminated earlier. On October 3, 2014, Viasystems and TTM filed their respective notification and report forms under the HSR Act with the Antitrust Division of the DOJ and the FTC. On October 31, 2014, TTM voluntarily withdrew its HSR Act notification and report forms. TTM refiled the required notifications with the Antitrust Division of the DOJ and the FTC on November 4, 2014.

In addition, private parties who may be adversely affected by the Merger and individual states may bring legal actions under the antitrust laws in certain circumstances. Although the parties believe the consummation of the Merger will not likely be prevented by antitrust law, there can be no assurance that a challenge to the Merger on antitrust grounds will not be made or, if a challenge is made, what the result will be. Under the Merger Agreement, Viasystems and TTM have agreed to use their reasonable best efforts to obtain all regulatory clearances necessary to consummate the Merger as promptly as reasonably practicable. In addition, in order to consummate the Merger, TTM and Viasystems may be required to comply with conditions, terms, obligations, or restrictions imposed by regulatory entities and such conditions, terms, obligations, or restrictions may have the effect of delaying completion of the Merger, imposing additional material costs on or materially limiting the revenues of TTM after the completion of the Merger, or otherwise reducing the anticipated benefits to TTM of the Merger. In addition, such conditions, terms, obligations, or restrictions may result in the delay or abandonment of the Merger.

Legal proceedings in connection with the Merger, the outcomes of which are uncertain, could delay or prevent the completion of the Merger.

Since the public announcement of the Merger Agreement on September 22, 2014, Viasystems, the members of the Viasystems Board, TTM, and Merger Sub have been named as defendants in two putative class action complaints challenging the Merger. The Lawsuits generally allege, among other things, that the Merger fails to properly value Viasystems, that the individual defendants breached their fiduciary duties in approving the Merger Agreement and that those breaches were aided and abetted by TTM, Merger Sub, and Viasystems. The Lawsuits seek, among other things, injunctive relief to enjoin the defendants from completing the Merger on the agreed-upon terms, rescinding, to the extent already implemented, the Merger Agreement or any of the terms therein, costs and disbursements, and attorneys’ and experts’ fees and costs, as well as other equitable relief as the court deems proper.

One of the conditions to the Merger is that no temporary restraining order, preliminary or permanent injunction, or other order (as defined in the Merger Agreement) issued by any court of competent jurisdiction or other legal restraint or prohibition preventing the consummation of the Merger shall be in effect; nor shall there be any statute, rule, regulation, or order enacted, entered, or enforced that prevents or prohibits the consummation of the Merger. Consequently, if the plaintiffs secure injunctive or other relief prohibiting, delaying, or otherwise adversely affecting the defendants’ ability to consummate the Merger, then such injunctive or other relief may prevent the Merger from becoming effective within the expected time frame or at all. If consummation of the Merger is prevented or delayed, it could result in substantial costs to TTM and Viasystems. In addition, TTM and Viasystems could incur significant costs in connection with the Lawsuits, including costs associated with the indemnification of Viasystems’ directors and officers.

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The announcement and pendency of the Merger could have an adverse effect on Viasystems’ stock price, business, financial condition, results of operations, or business prospects.

The announcement and pendency of the Merger could disrupt Viasystems’ business in the following ways, among others:

Any of these matters could adversely affect the stock price, business, financial condition, results of operations, or business prospects of Viasystems.

Failure to consummate the Merger could negatively impact the stock price and the future business and financial results of TTM and Viasystems.

If the Merger is not consummated for any reason, including as a result of Viasystems stockholders failing to adopt the Merger Agreement, the ongoing businesses of TTM and Viasystems may be adversely affected and, without realizing any of the benefits of having consummated the Merger, TTM and Viasystems would be subject to a number of risks, including the following:

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In addition to the above risks, Viasystems may be required, under certain circumstances, to pay to TTM a termination fee of $12.8 million, which may materially adversely affect Viasystems’ financial results. TTM may also be required, under certain circumstances, to pay to Viasystems a reverse breakup fee of $40.0 million, which may materially adversely affect TTM’s financial results. Further, TTM and Viasystems could be subject to litigation related to any failure to consummate the Merger or related to any enforcement proceeding commenced against TTM or Viasystems to perform their respective obligations under the Merger Agreement. If the Merger is not consummated, these risks may materialize and may adversely affect TTM’s and Viasystems’ businesses, financial condition, financial results, and stock prices.

TTM’s and Viasystems’ business relationships may be subject to disruption due to uncertainty associated with the Merger.

Parties with which TTM or Viasystems do business may experience uncertainty associated with the proposed Merger, including with respect to current or future business relationships with TTM, Viasystems, or the combined company. TTM’s and Viasystems’ business relationships may be subject to disruption, as customers, distributors, suppliers, vendors, and others may attempt to negotiate changes in existing business relationships or consider entering into business relationships with parties other than TTM, Viasystems, or the combined company. These disruptions could have an adverse effect on the businesses, financial condition, or results of operations of the combined company, including an adverse effect on TTM’s ability to realize the anticipated benefits of the Merger. The risk and adverse effect of such disruptions could be exacerbated by a delay in consummating the Merger or termination of the Merger Agreement.

Any delay in consummating the Merger may substantially reduce the benefits that TTM expects to obtain from the Merger.

Satisfying the conditions to, and consummation of, the Merger may take longer than, and could cost more than, TTM and Viasystems expect. TTM and Viasystems cannot predict whether or when the conditions to the Merger will be satisfied, and satisfying the conditions to the Merger could delay the effective time of the Merger for a significant period of time or prevent it from occurring. Any delay in consummating the Merger or any additional conditions imposed in order to consummate the Merger may materially adversely affect the synergies and other benefits that TTM expects to achieve if the Merger and the integration of the companies’ respective businesses are completed within the expected timeframe. In addition, each of TTM and Viasystems may terminate the Merger Agreement if the Merger is not consummated by the Outside Date, which is June 21, 2015. However, the Outside Date may be extended at the election of either party to September 21, 2015 if the only unsatisfied conditions to the Merger are those regarding receipt of required antitrust clearances or the CFIUS Approval and the absence of legal restraints attributable to any antitrust or competition laws or Exon-Florio.

TTM may be unable to realize anticipated cost synergies or may incur additional costs.

TTM has identified at least $25 million in pre-tax cost synergies, which are expected to be realized within the first year following consummation of the Merger. TTM expects that these will result from combining the sales and general and administrative functions of the two companies. To realize these synergies, TTM expects to incur costs of approximately $18 million in 2015, of which approximately $1 million will consist of capital expenditures. While TTM’s management believes that these cost synergies are achievable, TTM may be unable to realize all of these cost synergies within the time frame expected or at all. In addition, TTM may incur additional and/or unexpected costs in order to realize these cost synergies.

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The integration of Viasystems may present significant challenges to TTM, and although TTM expects the Merger with Viasystems will result in cost savings, synergies, and other benefits to TTM, TTM may not realize those benefits because of difficulties related to integration, the realization of synergies, and other challenges.

TTM and Viasystems have operated and, until consummation of the Merger, will continue to operate, independently, and there can be no assurances that their businesses can be integrated successfully. It is possible that the integration process could result in the loss of key TTM or Viasystems employees, the loss of customers, the disruption of either company’s or both companies’ ongoing businesses or other unexpected integration issues, higher than expected integration costs and an overall post-completion integration process that takes longer than originally anticipated. Specifically, the following issues and potential risks, among others, must be addressed in integrating the operations of Viasystems and TTM in order to realize the anticipated benefits of the Merger so the combined company performs as expected:

If TTM cannot successfully integrate Viasystems, TTM may experience material negative consequences to its business, financial condition, or results of operations. Successful integration of Viasystems will depend on TTM’s ability to manage these operations, to realize opportunities for revenue growth and, to some degree, to eliminate redundant and excess costs. Because of difficulties in combining the two companies, TTM may not be able to achieve the benefits that it hopes to achieve as a result of the Merger.

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The Merger may be consummated on different terms from those contained in the Merger Agreement.

Prior to the consummation of the Merger, the parties may, by their mutual agreement, amend or alter the terms of the Merger Agreement, including with respect to, among other things, the Merger Consideration to be received by Viasystems stockholders, assets to be acquired, or any covenants or agreements with respect to the parties’ respective operations during the pendency thereof, except that following adoption of the Merger Agreement by the Viasystems stockholders, no amendment may be made without further stockholder approval which, by law or in accordance with the rules of the Nasdaq Global Market, requires further approval by such stockholders. Any such amendments or alterations may have negative consequences to Viasystems stockholders including, among other things, reducing the cash available for TTM’s or Viasystems’ operations or to meet respective obligations or restricting or limiting assets or operations of either of TTM or Viasystems. Under certain circumstances, Viasystems stockholders may be permitted or required to adopt any such amendments, which could delay the consummation of the Merger and subject Viasystems and TTM to additional expense.

TTM will incur significant transaction and Merger-related costs in connection with the Merger.

TTM expects to incur a number of non-recurring costs associated with combining the operations of the two companies. Most of these non-recurring costs will be comprised of transaction and regulatory costs related to the Merger, including fees paid to financial and legal advisors related to the Merger and related financing arrangements, and employment-related costs. In addition, pursuant to change-in-control provisions in Viasystems’ employment agreements with certain executives, such executives may be entitled to receive change-in-control related payments upon a termination of employment. See “The Merger—Payments to Viasystems Executive Officers Contingent Upon the Merger” beginning on page 110 of this proxy statement/prospectus.

TTM will also incur transaction fees and costs related to formulating and implementing integration plans, including facilities and systems consolidation costs and employment-related costs. TTM continues to assess the magnitude of these costs, and additional unanticipated costs may be incurred in the Merger and the integration of the two companies’ businesses. Although TTM expects that the elimination of duplicative costs, as well as the realization of other efficiencies related to the integration of the businesses, should allow TTM to offset incremental Merger and integration-related costs over time, this net benefit may not be achieved in the near term, or at all. See the risk factor entitled “—The integration of Viasystems may present significant challenges to TTM, and although TTM expects the Merger with Viasystems will result in cost savings, synergies, and other benefits to TTM, TTM may not realize those benefits because of difficulties related to integration, the realization of synergies, and other challenges.”

TTM will incur substantial additional indebtedness in connection with the Merger.

In connection with the Merger, TTM has received commitments for financing arrangements consisting of a senior secured asset-based revolving facility (the “ABL Facility”) in an aggregate amount of $150 million, and a senior secured term loan B facility (the “Term B Facility” and, together with the ABL Facility, the “Credit Facilities”) in an aggregate amount of $1,115 million. While TTM has obtained a commitment for such financing, it is continuing to evaluate and explore various capital structure options for the ultimate financing structure to be implemented. Any such final documentation will be entered into in connection with the consummation of the Merger. TTM intends to use the aggregate proceeds of the Term B Facility to pay the cash portion of the Merger Consideration to consummate the Merger, to refinance certain existing indebtedness of Viasystems, to refinance certain existing indebtedness of TTM, and to pay the fees and expenses incurred in connection with the Merger. TTM does not presently expect to draw on the ABL Facility. This additional indebtedness of TTM may limit the combined company’s operating flexibility following the Merger and may otherwise strain the combined company’s liquidity and financial condition.

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As a result of the Merger, TTM’s goodwill, indefinite-lived intangible assets, and other intangible assets in its consolidated balance sheet will increase. If its goodwill, indefinite-lived intangible assets, or other intangible assets become impaired in the future, TTM would be required to record a material, non-cash charge to earnings, which would also reduce its stockholders’ equity.

Under GAAP, goodwill and indefinite-lived intangible assets are reviewed for impairment on an annual basis (or more frequently if events or circumstances indicate that their carrying value may not be recoverable) and other intangible assets if events or circumstances indicate that their carrying value may not be recoverable. If TTM’s goodwill, indefinite-lived intangible assets, or other intangible assets are determined to be impaired in the future, TTM will be required to record a material, non-cash charge to earnings during the period in which the impairment is determined.

The Merger Agreement contains provisions that limit Viasystems’ ability to pursue alternatives to the Merger, which could discourage a potential acquirer of Viasystems from making an alternative transaction proposal or could result in a competing proposal being at a lower price than it might otherwise be and, in certain circumstances, could require Viasystems to pay TTM a significant termination fee.

The Merger Agreement contains “no shop” provisions that, subject to limited exceptions, require that Viasystems may not (1) solicit, initiate, cause, knowingly facilitate, or encourage the submission of any inquiries, proposals or offers or any other efforts or attempts that constitute or may reasonably be expected to lead to any acquisition proposal, or engage in any discussions or negotiations with respect thereto or otherwise cooperate with or assist or participate in, or knowingly facilitate or encourage, any such inquiries, proposals, discussions or negotiations, or resolve to or publicly propose to take any of the foregoing actions, (2) approve or recommend, or resolve to or publicly propose to approve or recommend, any acquisition proposal or enter into any Merger Agreement, agreement-in-principle, letter of intent, share purchase agreement, asset purchase agreement, share exchange agreement, option agreement, or other similar agreement relating to an acquisition proposal or enter into any letter of intent, agreement or agreement-in-principle requiring Viasystems to abandon, terminate or fail to consummate the Merger or (3) (a) withdraw, modify, or qualify in a manner adverse to TTM or Merger Sub the recommendation of the Viasystems Board or the approval or declaration of advisability by the Viasystems Board of the Merger Agreement and the transactions contemplated thereby (including the Merger) or (b) approve or recommend, or resolve to or publicly propose to approve or recommend, any acquisition proposal.

The Merger Agreement also provides that Viasystems will be required to pay a termination fee of $12.8 million to TTM upon termination of the Merger Agreement under certain circumstances. These provisions might discourage a potential competing acquirer that might have an interest in acquiring all or a significant part of Viasystems from considering or proposing an acquisition even if it were prepared to pay consideration with a higher per share market price than that proposed in the Merger, or might result in a potential competing acquirer proposing to pay a lower per share price to acquire Viasystems than it might otherwise have proposed to pay.

The opinion delivered by Stifel will not reflect changes in circumstances between the date of such opinion and the completion of the Merger.

The Viasystems Board has not obtained an updated opinion as of the date of this proxy statement/prospectus from Stifel, its financial advisor. Changes in the operations and prospects of Viasystems or TTM, general market and economic conditions and other factors that may be beyond their control, and on which the opinions were based, may alter the value of Viasystems or TTM or the prices of Viasystems common stock or TTM common stock by the time the Merger is consummated. The opinion does not speak as of the time the Merger will be consummated or as of any date other than the date of such opinion. Because Viasystems does not anticipate asking Stifel to update its opinion, the opinion only addresses the fairness, from a financial point of view, of the Merger Consideration to the holders of the Merger Shares as of the date of such opinion. Stifel’s opinion is included as Annex C to this proxy statement/prospectus. For a description of the opinion, please refer to “The Merger—Opinion of Financial Advisor to Viasystems” beginning on page 91 of this proxy statement/prospectus.

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Viasystems executive officers and directors have financial interests in the Merger that may be different from, or in addition to, the interests of Viasystems stockholders.

Executive officers of Viasystems negotiated the terms of the Merger Agreement with their counterparts at TTM, and the Viasystems Board unanimously determined that the transactions contemplated by the Merger Agreement, including the Merger, are advisable and fair to, and in the best interests of, Viasystems and its stockholders, approved the Merger Agreement and declared advisable the Merger and unanimously recommended that Viasystems stockholders adopt the Merger Agreement. In considering these facts and the other information contained in this proxy statement/prospectus, you should be aware that Viasystems’ executive officers and directors have financial interests in the Merger that may be different from, or in addition to, the interests of Viasystems stockholders. For a detailed discussion of the special interests that Viasystems’ directors and executive officers may have in the Merger, see “The Merger—Interests of Certain Persons in the Merger” beginning on page 105 of this proxy statement/prospectus.

Risks Related to the Combined Company Following the Merger

The market price of TTM common stock and TTM’s results of operations may be affected by factors different from those affecting the market price of Viasystems common stock and Viasystems’ results of operations.

Viasystems stockholders will be entitled to receive the Merger Consideration, which is partially comprised of TTM common stock and will thus become TTM stockholders upon the consummation of the Merger. TTM’s business is different from that of Viasystems, and TTM’s results of operations, as well as the market price of TTM common stock, may be affected by factors different from those affecting Viasystems’ results of operations and the market price of Viasystems common stock. The market price of TTM common stock may fluctuate significantly following the Merger, including as a result of factors over which TTM has no control. As a result, receiving TTM common stock as part of the Merger Consideration could result in the former Viasystems stockholders losing the value of the investment they had made in Viasystems common stock.

Failure to achieve expected benefits of the Merger and to integrate Viasystems’ operations with TTM’s could adversely affect TTM following the completion of the Merger and the market price of TTM common stock.

Although TTM expects to realize strategic, operational, and financial benefits as a result of the Merger, TTM cannot be certain whether, and to what extent, such benefits will be achieved in the future. In particular, the success of the Merger will depend on achieving efficiencies and cost savings, and no assurances can be given that TTM will be able to do so. For example, costs associated with Viasystems’ legal proceedings and other loss contingencies may be greater than expected. In addition, in order to obtain the benefits of the Merger, TTM must integrate Viasystems’ operations. Such integration may be complex and the failure to do so quickly and effectively may negatively affect earnings.

In addition, the market price of TTM common stock may decline as a result of the Merger if the integration of TTM and Viasystems is unsuccessful, takes longer than expected, or fails to achieve financial benefits to the extent anticipated by financial analysts or investors, or the effect of the Merger on TTM’s financial results is otherwise not consistent with the expectations of financial analysts or investors.

The pro forma financial statements included in this proxy statement/prospectus may not be an indication of the combined company’s financial condition or results of operations following the Merger.

The pro forma financial statements contained in this proxy statement/prospectus are based on various adjustments, assumptions, and preliminary estimates and may not be an indication of the combined company’s financial condition or results of operations following the Merger for several reasons. See “Unaudited Pro Forma Condensed Combined Financial Information” beginning on page 47 of this proxy statement/prospectus. The actual financial condition and results of operations of the combined company following the Merger may not be consistent with, or evident from, these pro forma financial statements. In addition, the assumptions used in

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preparing the pro forma financial information may not prove to be accurate, and other factors may affect the combined company’s financial condition or results of operations following the Merger. Any potential decline in the combined company’s financial condition or results of operations may cause significant variations in the stock price of TTM following the Merger.

Viasystems stockholders will have a reduced ownership and voting interest in TTM after the Merger and, as a result, will be able to exert less influence over management.

Following the Merger, each Viasystems stockholder will become a stockholder of TTM with a percentage ownership of TTM after the Merger that is smaller than the stockholder’s percentage ownership of Viasystems. It is expected that the former stockholders of Viasystems as a group will own approximately 15.9% of the outstanding shares of TTM common stock immediately after consummation of the Merger. Because of this, Viasystems stockholders will have substantially less influence on the management and policies of TTM after the Merger than they now have with respect to the management and policies of Viasystems.

TTM may be unable to hire and retain sufficient qualified personnel, and the loss of any of TTM’s key executive officers could adversely affect TTM.

TTM believes that its future success will depend in large part on its ability to attract and retain highly skilled, knowledgeable, sophisticated, and qualified managerial and professional personnel, including, following the Merger, key employees of Viasystems. Key employees of TTM or Viasystems may depart for a variety of reasons, including because of issues relating to the difficulty of integration or accelerated retirement as a result of amounts received in connection with the Merger. If key employees of TTM or Viasystems depart, the integration of the companies may be more difficult and the combined company’s business following the Merger may be harmed. Furthermore, TTM may have to incur significant costs in identifying, hiring and retaining replacements for departing employees and may lose significant expertise and talent relating to the businesses of TTM or Viasystems, and TTM’s ability to realize the anticipated benefits of the Merger may be adversely affected. In addition, there could be disruptions to or distractions for the workforce and management associated with integrating employees into TTM. Accordingly, no assurance can be given that TTM will be able to attract or retain key employees of TTM and Viasystems to the same extent that those companies have been able to attract or retain their own employees in the past.

The combined company may require additional capital in the future, which may not be available to it on satisfactory terms, if at all.

The combined company will require liquidity to fund its operations and make interest and principal payments on its debt. To the extent that the funds generated by the combined company’s ongoing operations are insufficient to cover its liquidity requirements, it may need to raise additional funds through financings. If the combined company cannot obtain adequate capital or sources of credit on favorable terms, or at all, its business, operating results and financial condition could be adversely affected. Any future equity or debt financing may not be available on terms that are favorable to the combined company, if at all.

Other Risk Factors of TTM and Viasystems

TTM’s and Viasystems’ businesses are and will be subject to the risks described above. In addition, TTM and Viasystems are, and will continue to be, subject to the risks described in TTM’s Annual Report on Form 10-K for the fiscal year ended December 30, 2013, and Viasystems’ Annual Report on Form 10-K for the fiscal year ended December 31, 2013, and as updated by their respective subsequent Quarterly Reports on Form 10-Q and any amendments thereto, and their respective Current Reports on Form 8-K, all of which are incorporated by reference into this proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

A number of the statements made or incorporated by reference in this proxy statement/prospectus are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act, Section 27A of the Securities Act of 1933 (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements are all statements made or incorporated by reference into this proxy statement/prospectus, other than statements of historical fact. In some cases, forward-looking statements can be identified by terminology such as “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “plans,” “projects,” “will,” “would,” and similar expressions or expressions of the negative of these terms. These statements include statements regarding the intent, belief, or current expectations of each of TTM and Viasystems and their respective subsidiaries, directors, and officers with respect to, among other things, future events, including the Merger, the respective financial results and financial trends expected to impact each of TTM and Viasystems prior to consummation of the Merger or if the Merger is not consummated, and future events expected to impact TTM thereafter, assuming the Merger is consummated.

Forward-looking statements are based upon certain underlying assumptions, including any assumptions mentioned with the specific statements, as of the date such statements were made. Such assumptions are in turn based upon internal estimates and analyses of market conditions and trends, management plans and strategies, economic conditions and other factors. While TTM and Viasystems believe these expectations, assumptions, estimates, and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown risks and uncertainties, many of which are beyond the control of TTM and Viasystems. By their nature, forward-looking statements and the assumptions underlying them are necessarily subject to risks and uncertainties inherent in projecting future conditions and results. Actual results may differ materially from the current expectations of TTM and Viasystems depending on a number of factors affecting their businesses and risks associated with the successful execution of the Merger and the integration and performance of their businesses following the Merger. These factors include, but are not limited to, those set forth under “Risk Factors” beginning on page 27 of this proxy statement/prospectus, and those set forth under “Forward-Looking Statements,” “Risk Factors” or any similar heading in the documents incorporated by reference herein, and the following factors:

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TTM and Viasystems caution you not to place undue reliance on the forward-looking statements, which speak only as of the date of this proxy statement/prospectus in the case of forward-looking statements contained in this proxy statement/prospectus, or the dates of the documents incorporated by reference in this proxy statement/prospectus in the case of forward-looking statements made in those incorporated documents. Except as may be required by law, neither TTM nor Viasystems has any obligation to update or alter these forward-looking statements, whether as a result of new information, future events, or otherwise.

TTM and Viasystems expressly qualify in their entirety all forward-looking statements attributable to TTM or Viasystems or any person acting on either of their respective behalf by the cautionary statements contained or referred to in this section.

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INFORMATION ABOUT TTM

TTM is a leading global provider of time-critical and technologically complex printed circuit board (PCB) products and backplane assemblies (PCBs populated with electronic components), which serve as the foundation of sophisticated electronic products. TTM is the largest PCB manufacturer in North America and one of the largest PCB manufacturers in the world. In 2013, TTM generated approximately $1.4 billion in net sales and ended the year with 16,290 employees worldwide. TTM operates a total of 13 specialized facilities in the United States and China.

TTM focuses on providing time-to-market and advanced technology products and offers a one-stop manufacturing solution to its customers from engineering support to prototype development through final volume production. This one-stop solution allows TTM to align technology development with the diversified needs of its customers, many of whom are based in high growth markets, and to enable them to reduce the time required to develop new products and bring them to market. TTM serves a diversified customer base consisting of over 1,000 customers in various markets throughout the world, including manufacturers of networking/communications infrastructure products, touch screen tablets and smartphones. TTM also serves aerospace and defense, high-end computing, and industrial/medical industries. TTM’s customers include both OEMs and EMS providers.

TTM common stock is listed on NASDAQ under the symbol “TTMI.” TTM was originally incorporated in Washington in 1978 and reincorporated in Delaware in 2005.

Additional information about TTM is included in the documents incorporated by reference into this proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

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INFORMATION ABOUT VIASYSTEMS

Viasystems is a technology leader and worldwide provider of complex multi-layer rigid, flexible and rigid-flex PCBs and E-M Solutions. In 2013, Viasystems generated approximately $1.2 billion in net sales and ended the year with 15,057 employees worldwide. PCBs serve as the “electronic backbone” of almost all electronic equipment, and Viasystems’ E-M Solutions products and services integrate PCBs and other components into finished or semi-finished electronic equipment, for which Viasystems also provides custom and standard metal enclosures, metal cabinets, metal racks and sub-racks, backplanes, and busbars. The products Viasystems manufactures include, or can be found in, a wide variety of commercial products, including automotive engine controls, hybrid converters, automotive electronics for navigation, safety and entertainment, telecommunications switching equipment, data networking equipment, computer storage equipment, semiconductor test equipment, wind and solar energy applications, off-shore drilling equipment, communications applications, flight control systems and complex industrial, medical and other technical instruments. Viasystems’ broad offering of E-M Solutions products and services includes component fabrication, component integration, and final system assembly and testing. These services can be bundled with Viasystems’ PCBs to provide an integrated solution to customers. Viasystems is a supplier to more than 1,000 OEMs and contract electronic manufacturers in numerous end markets.

Viasystems common stock is listed on the Nasdaq Global Market under the symbol “VIAS” and began trading on February 17, 2010. Viasystems was incorporated in Delaware in 1996 under the name Circo Craft Holding Company. Circo Craft Holding Company had no operations prior to its first acquisition in October 1996, when it changed its name to Circo Technologies, Inc. In January 1997, Circo Technologies, Inc. changed its name to Viasystems Group, Inc.

Additional information about Viasystems is included in the documents incorporated by reference into this proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

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SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF TTM

The following table presents selected historical consolidated financial data for TTM as of and for the fiscal years ended December 30, 2013, December 31, 2012, December 31, 2011, December 31, 2010, and December 31, 2009 and as of June 30, 2014 and for the six months ended June 30, 2014 and July 1, 2013. The statement of operations data for each of the three years ended December 30, 2013, December 31, 2012 and December 31, 2011 and the balance sheet data as of December 30, 2013 and December 31, 2012 have been obtained from TTM’s audited consolidated financial statements contained in its Annual Report on Form 10-K for the fiscal year ended December 30, 2013, which are incorporated by reference into this proxy statement/prospectus. The statement of operations data for the years ended December 31, 2010 and 2009 and the balance sheet data as of December 31, 2011, 2010 and 2009 have been obtained from TTM’s audited consolidated financial statements for such years, which have not been incorporated into this document by reference. The statement of operations data for the six months ended June 30, 2014 and July 1, 2013 and the balance sheet data as of June 30, 2014 have been obtained from TTM’s unaudited consolidated financial statements included in its Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, which is incorporated by reference into this proxy statement/prospectus. In the opinion of TTM’s management, the unaudited interim financial data include all adjustments, consisting of only normal non-recurring adjustments, considered necessary for a fair statement of this information.

The information should be read in conjunction with TTM’s consolidated financial statements and the related notes thereto and the information under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in TTM’s Annual Report on Form 10-K for the fiscal year ended December 30, 2013, and the unaudited interim condensed consolidated financial statements and the related notes thereto and the information under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in TTM’s Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2014, which are both incorporated by reference in this proxy statement/prospectus. For additional information on documents incorporated by reference in this proxy statement/prospectus, see “Where You Can Find More Information” beginning on page 182 of this proxy statement/prospectus.

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Consolidated Statements of Operations Data