Exhibit 99.1

NEWS COPY

FOR IMMEDIATE RELEASE

VIASYSTEMS ANNOUNCES FOURTH QUARTER 2014 RESULTS

ST. LOUIS, February 12, 2015 – Viasystems Group, Inc. (NASDAQ:VIAS), a leading provider of complex multi-layer printed circuit boards and electro-mechanical solutions, today announced results for the fourth quarter ended December 31, 2014.

Highlights

“The settlement of our business interruption insurance claim certainly helped our reported profit for the period,” noted David M. Sindelar, chief executive officer of Viasystems, “but even without that favorable impact, we had a solid quarter, growing net sales both sequentially and year-over-year.”

Use of Non-GAAP Financial Measures

In addition to the condensed consolidated financial statements presented in accordance with U.S. GAAP, management uses certain non-GAAP financial measures, including “Adjusted EBITDA” and “Adjusted EPS”.

Adjusted EBITDA is not a recognized financial measure under U.S. GAAP, and does not purport to be an alternative to operating income or an indicator of operating performance. Adjusted EBITDA is presented to enhance an understanding of operating results and is not intended to represent cash flows or results of operations. The Board of Directors, lenders and management use Adjusted EBITDA primarily as an additional measure of operating performance for matters including executive compensation and competitor comparisons. The use of this non-GAAP measure provides an indication of the company’s ability to service debt, and management considers it an appropriate measure to use because of the company’s leveraged position.

Adjusted EBITDA has certain material limitations, primarily due to the exclusion of certain amounts that are material to the company’s consolidated results of operations, such as interest expense, income tax expense, and depreciation and amortization. In addition, Adjusted EBITDA may differ from the Adjusted EBITDA calculations reported by other companies in the industry, limiting its usefulness as a comparative measure.

The company uses Adjusted EBITDA to provide meaningful supplemental information regarding operating performance and profitability by excluding from Adjusted EBITDA certain items that the company believes are not indicative of its ongoing operating results or will not impact future operating cash flows, which include restructuring and impairment charges, loss on early extinguishment of debt, stock compensation, costs associated with acquisitions and equity registrations, and other, net.

Adjusted EPS is not a recognized financial measure under U.S. GAAP, does not purport to be an indicator of the company’s financial performance, and might not be consistent with measures used by other companies. The company’s management believes this supplemental measure is useful in understanding underlying trends of the business and analyzing the effects of certain events that are infrequent or unusual for the company.

Adjusted EPS has certain material limitations, primarily due to the exclusion of certain amounts from earnings that are material to the company’s consolidated results of operations, such as costs associated with acquisitions and equity registrations, restructuring and impairment charges, certain interest and other expenses, and certain adjustments to net income to arrive at net income available to common stockholders. As a result, Adjusted EPS differs materially from the earnings per share calculations reported by other companies in the industry, limiting its usefulness as a comparative measure.

Forward Looking Statements

Certain statements in this communication constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are made on the basis of the current beliefs, expectations and assumptions of the management of Viasystems regarding future events and are subject to significant risks and uncertainty. Statements regarding our expected performance in the future are forward-looking statements. Investors are cautioned not to place undue reliance on any such forward-looking statements, which speak only as of the date they are made. Viasystems undertakes no obligation to update or revise these statements, whether as a result of new information, future events or otherwise, except to the extent required by law. Actual results may differ materially from those expressed or implied. Such differences may result from a variety of factors, including but not limited to: legal or regulatory proceedings; the ability of Viasystems to successfully complete the proposed merger with TTM and the timing of the proposed merger; any actions taken by the company, including but not limited to, restructuring or strategic initiatives (including capital investments or asset acquisitions or dispositions); or developments beyond the company’s control, including but not limited to, changes in domestic or global economic conditions, competitive conditions and consumer preferences, adverse weather conditions or natural disasters, health concerns, international, political or military developments and technological developments. Additional factors that may cause results to differ materially from those described in the forward-looking statements are set forth under the headings “Item 1A. Risk Factors,” in the Annual Report on Form 10-K filed by Viasystems with the SEC on February 14, 2014, “Part II Item 1A: Risk Factors” in each Quarterly Report on Form 10-Q filed by Viasystems with the SEC on May 8, 2014, August 7, 2014 and November 10, 2014, and in Viasystems’ other filings made from time to time with the SEC and available at the SEC’s website, www.sec.gov.

About Viasystems

Viasystems Group, Inc. is a technology leader and a worldwide provider of complex multi-layer printed circuit boards (PCBs) and electro-mechanical solutions (E-M Solutions). Its PCBs serve as the “electronic backbone” of almost all electronic equipment, and its E-M Solutions products and services include integration of PCBs and other components into finished or semi-finished electronic equipment, for which it also provides custom and standard metal enclosures, cabinets, racks and sub-racks, backplanes and busbars. Viasystems’ approximately 14,850 employees around the world serve over 1,000 customers in the automotive, industrial & instrumentation, computer and datacommunications, telecommunications, and military and aerospace end markets. For additional information about Viasystems, please visit the company’s website at www.viasystems.com.

Contacts

Kelly Wetzler

SVP Corporate Development

314-746-2217

kelly.wetzler@viasystems.com

Erica Mannion

Investor Relations

Sapphire Investor Relations, LLC

415-471-2703

emannion@sapphireir.com

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VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(dollars in thousands, except per share amounts)

(Unaudited)

This information is intended to be reviewed in conjunction with the company’s filings with the Securities and Exchange Commission.

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VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(dollars in thousands)

This information is intended to be reviewed in conjunctions with the company’s filings with the Securities and Exchange Commission.

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VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollars in thousands)

(Unaudited)

This information is intended to be reviewed in conjunction with the company’s filings with the Securities and Exchange Commission.

5

VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

SUPPLEMENTAL INFORMATION

NET SALES AND BALANCE SHEET STATISTICS

(dollars in millions)

(Unaudited)

6

VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

SUPPLEMENTAL INFORMATION

RECONCILIATION OF OPERATING INCOME

TO ADJUSTED EBITDA

(dollars in millions)

(Unaudited)

7

VIASYSTEMS GROUP, INC. AND SUBSIDIARIES

SUPPLEMENTAL INFORMATION

RECONCILIATION OF DILUTED EARNINGS PER SHARE

TO ADJUSTED EARNINGS PER SHARE

(dollars in thousands, except per share amounts)

(Unaudited)

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