Exhibit 99.1

Teradyne Reports Third Quarter 2014 Results

NORTH READING, Mass. – October 22, 2014 – Teradyne, Inc. (NYSE: TER) reported revenue of $478 million for the third quarter of 2014 of which $380 million was in Semiconductor Test, $55 million in Wireless Test and $43 million in System Test. On a non-GAAP basis, Teradyne’s net income in the third quarter was $95.8 million, or $0.44 per diluted share, which excluded acquired intangible asset amortization and discrete income tax adjustments. GAAP net income for the third quarter was $82.9 million or $0.38 per diluted share.

Orders in the third quarter of 2014 were $273 million of which $203 million were in Semiconductor Test, $42 million in Wireless Test, and $28 million in System Test.

“The continued strong build out of electronics test capacity, combined with our market share gains, has driven our semiconductor test orders and revenue up over 30% year to date when compared with the same period in 2013,” said CEO and President Mark Jagiela. “As we enter the seasonally slower fourth quarter period, we’re encouraged by share gains at LitePoint in cellular and NFC test, broad adoption of new flash, System-on-Chip and production board test products, and improving results in analog test. At the mid-point of our Q4 guidance, we’ll end the full year with double digit growth in both revenue and earnings for the company.”

Guidance for the fourth quarter of 2014 is revenue of $305 million to $330 million, with diluted non-GAAP net income of $0.08 to $0.14 per share and diluted GAAP net loss of ($0.16) to ($0.11) per share. Non-GAAP guidance includes stock based compensation but excludes acquired intangible asset amortization, estimated fourth quarter pension actuarial loss due to updated mortality tables and the related tax impact on non-GAAP adjustments.

Webcast

A conference call to discuss the third quarter 2014 results, along with management’s business outlook, will follow at 10 a.m. EDT, Thursday, October 23. The call will be broadcast simultaneously over the Internet. Interested investors should access the webcast at www.teradyne.com and click on “Investors” at least five minutes before the call begins. Presentation materials will be available at www.teradyne.com at 10 a.m. EDT.

A replay will be available approximately two hours after the completion of the call. The replay number in the U.S. & Canada is 855-859-2056. The replay number outside the U.S. & Canada is 404-537-3406. The pass code for both numbers is 5850439. A replay will also be available on the Teradyne website at www.teradyne.com. Click on “Investors” for a link to the replay.

Non-GAAP Results

In addition to disclosing results that are determined in accordance with GAAP, Teradyne also discloses non-GAAP results of operations that exclude certain income items and charges. These results are provided as a complement to results provided in accordance with GAAP. Non-GAAP income from operations and non-GAAP net income exclude acquired intangible asset amortization, retired CEO equity charge, non-cash convertible debt interest, discrete income tax adjustments, pension and post retirement actuarial gains and losses, restructuring and other, and a gain from the sale of an equity investment, and, prior to January 1, 2014, included income taxes on a cash basis [cash taxes reflects the usage of prior year favorable tax attributes (e.g. NOLs and credits) against current year tax liability]. GAAP requires that these items be included in determining income from operations and net income. Non-GAAP income from operations, non-GAAP net income, non-GAAP income from operations and non-GAAP net income as a percentage of revenue, and non-GAAP net income per share are non-GAAP measures presented to provide meaningful supplemental information regarding Teradyne’s baseline performance before gains, losses or other charges that may not be indicative of Teradyne’s current core business or future outlook. These non-GAAP measures are used to make operational decisions, to determine employee compensation, to forecast future operational results, and for comparison with Teradyne’s business plan, historical operating results and the operating results of Teradyne’s competitors. Non-GAAP gross margin excludes pension and post retirement actuarial gains and losses. GAAP requires that this item be included in determining gross margin. Non-GAAP gross margin dollar amount and percentage are non-GAAP measures that management believes provide useful supplemental information for management and the investor. Management uses non-GAAP gross margin as a performance measure for Teradyne’s current core business and future outlook and for comparison with Teradyne’s business plan, historical gross margin results and the gross margin results of Teradyne’s competitors. Non-GAAP diluted shares include the impact of Teradyne’s call option on its shares. Management believes each of these non-GAAP measures provides useful supplemental information for investors, allowing greater transparency to the information used by management in its operational decision making and in the review of Teradyne’s financial and operational performance, as well as facilitating meaningful comparisons of Teradyne’s results in the current period compared with those in prior and future periods. A reconciliation of each available GAAP to non-GAAP financial measure discussed in this press release is contained in the attached exhibits and on the Teradyne website at www.teradyne.com by clicking on “Investors” and then selecting the “GAAP to Non-GAAP Reconciliation” link. The non-GAAP financial measures discussed in this press release may not be comparable to similarly titled measures used by other companies. The presentation of non-GAAP measures is not meant to be considered in isolation, as a substitute for, or superior to, financial measures or information provided in accordance with GAAP.

About Teradyne

Teradyne (NYSE:TER) is a leading supplier of Automatic Test Equipment used to test semiconductors, wireless products, data storage and complex electronic systems which serve consumer, communications, industrial and government customers. In 2013, Teradyne had revenue of $1.43 billion and currently employs approximately 3,900 people worldwide. For more information, visit www.teradyne.com. Teradyne (R) is a registered trademark of Teradyne, Inc. in the U.S. and other countries.

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Safe Harbor Statement

This release contains forward-looking statements regarding future business prospects, Teradyne’s results of operations, market conditions and the payment of a quarterly dividend. Such statements are based on the current assumptions and expectations of Teradyne’s management and are neither promises nor guarantees of future performance or future payment of dividends. You can identify these forward-looking statements based on the context of the statements and by the fact that they use words such as “will,” “anticipate,” “expect,” “project,” “intend,” “plan,” “believe,” “target” and other words and terms of similar meaning in connection with any discussion of future operating or financial performance. There can be no assurance that management’s estimates of Teradyne’s future results or other forward looking statements will be achieved or that dividends will be declared in the future. Important factors that could cause actual results or dividend payments to differ materially from those presently expected include: conditions affecting the markets in which Teradyne operates; decreased or delayed product demand; increased research and development spending; deterioration of Teradyne’s financial condition, the business judgment of the board of directors that a declaration of a dividend is not in the company’s best interests and other events, factors and risks disclosed in filings with the SEC, including, but not limited to, the “Risk Factors” section of Teradyne’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013 and Quarterly Report on Form 10-Q for the period ended June 29, 2014. The forward-looking statements provided by Teradyne in this press release represent management’s views as of the date of this release. Teradyne anticipates that subsequent events and developments may cause management’s views to change. However, while Teradyne may elect to update these forward-looking statements at some point in the future, Teradyne specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Teradyne’s views as of any date subsequent to the date of this release.

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TERADYNE, INC. REPORT FOR THIRD FISCAL QUARTER OF 2014

CONDENSED CONSOLIDATED OPERATING STATEMENTS

(In thousands, except per share amounts)

CONDENSED CONSOLIDATED BALANCE SHEETS (In thousands)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (In thousands)

GAAP to Non-GAAP Earnings Reconciliation

(In millions, except per share amounts)

GAAP to Non-GAAP Reconciliation of Fourth Quarter 2014 guidance: