Exhibit 99.1

Teradyne Reports Fourth Quarter and Fiscal Year 2015 Results

NORTH READING, Mass. – January 27, 2016 – Teradyne, Inc. (NYSE: TER) reported revenue of $318 million for the fourth quarter of 2015 of which $205 million was in Semiconductor Test, $59 million in System Test, $32 million in Wireless Test and $22 million in Industrial Automation. On a non-GAAP basis, Teradyne’s net income in the fourth quarter was $26.1 million, or $0.13 per diluted share, which excluded acquired intangible asset amortization, pension actuarial losses, restructuring and other charges, and discrete income tax adjustments. GAAP net loss for the fourth quarter was ($0.6) million or ($0.00) per diluted share.

Orders in the fourth quarter of 2015 were $522 million of which $408 million was in Semiconductor Test, $66 million in System Test, $30 million in Wireless Test and $18 million in Industrial Automation.

For the fiscal year, Teradyne reported revenue of $1,640 million of which $1,202 million was in Semiconductor Test, $211 million in System Test, $185 million in Wireless Test and $42 million in Industrial Automation. On a non-GAAP basis, Teradyne’s net income for 2015 was $271.2 million, or $1.27 per diluted share, which excluded acquired intangible asset amortization, pension actuarial losses, and discrete income tax adjustments. GAAP net income for the year was $206.5 million or $0.97 per diluted share. Cash provided by operating activities for 2015 was $413 million and purchases of property, plant and equipment were $90 million.

“We closed 2015 with exceptionally strong Semiconductor Test demand as orders for our flagship UltraFLEX product line were pulled into the fourth quarter to meet 2016 production ramps for new mobile products,” said CEO and President Mark Jagiela. “At Universal Robots, we set quarterly and annual revenue records as customers serving a broad swath of industrial markets continue to embrace collaborative robots.”

“For the year, revenues again topped $1.6 billion despite the cyclical softness of the Semiconductor Test market in 2015. In addition, we generated $323 million in free cash flow, returned $350 million to shareholders through share repurchases and dividends, and added a new growth dimension to Teradyne in the fast expanding collaborative robot (cobot) market with the acquisition of Universal Robots. We enter 2016 well positioned to grow share in our core test businesses, broaden the range of applications for cobots, and continue our balanced capital allocation strategy,” continued Mr. Jagiela.

Teradyne’s Board of Directors also declared a quarterly cash dividend of $0.06 per share, payable on March 21, 2016 to shareholders of record as of the close of business on February 26, 2016.

Guidance for the first quarter of 2016 is revenue of $410 million to $440 million, with non-GAAP net income of $0.23 to $0.29 per diluted share and GAAP net income of $0.15 to $0.21 per diluted share. Non-GAAP guidance excludes acquired intangible asset amortization.

Webcast

A conference call to discuss the fourth quarter and 2015 results, along with management’s business outlook, will occur at 10 a.m. ET, Thursday, January 28, 2016. 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/investors at 10 a.m. ET. A replay of the call will also be available on the Teradyne website.

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, pension actuarial losses, fair value inventory step-up related to Universal Robots, goodwill impairment, retired CEO equity charge, non-cash convertible debt interest, discrete income tax adjustments, restructuring and other, and a gain from the sale of an equity investment. 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 fair value inventory step-up related to Universal Robots and pension actuarial losses. GAAP requires that these items 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. Prior to September 29, 2014, non-GAAP diluted shares included the impact of Teradyne’s call option and warrant 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

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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 automation equipment for test and industrial applications. Teradyne Automatic Test Equipment (ATE) is used to test semiconductors, wireless products, data storage and complex electronic systems, which serve consumer, communications, industrial and government customers. Our Industrial Automation products include Collaborative Robots used by global manufacturing and light industrial customers to improve quality and increase manufacturing efficiency. In 2015, Teradyne had revenue of $1.64 billion and currently employs approximately 4,100 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.

Safe Harbor Statement

This release contains forward-looking statements regarding future business prospects, Teradyne’s results of operations, market conditions, the payment of a quarterly dividend, the repurchase of Teradyne common stock pursuant to a share repurchase program and a senior secured credit facility. Such statements are based on the current assumptions and expectations of Teradyne’s management and are neither promises nor guarantees of future performance, future events, future payment of dividends, future repurchases of common stock or future availability of, or borrowing under, a credit facility. There can be no assurance that management’s estimates of Teradyne’s future results or other forward-looking statements will be achieved. Additionally, the current dividend and share repurchase programs may be modified, suspended or discontinued at any time. Important factors that could cause actual results, dividend payments, repurchases of common stock or borrowings under the credit facility to differ materially from those presently expected include: conditions affecting the markets in which Teradyne operates; decreased or delayed product demand; market acceptance of new products; the ability to grow Universal Robots’ business; 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, the repurchase of common stock or debt under the credit facility 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, 2014 and the Quarterly Report on Form 10-Q for the period ended October 4, 2015. 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 FOURTH FISCAL QUARTER OF 2015

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)