Teradyne Announces Underwriters Exercise Option to Purchase Additional $15 Million of 4.50% Convertible Senior Notes

Teradyne, Inc. (NYSE: TER) today announced that the underwriters have exercised their option to purchase an additional $15 million aggregate principal amount of 4.50% convertible senior notes due 2014.

Goldman, Sachs & Co. and Merrill Lynch & Co. are acting as joint book-running managers for the offering.

The offering of the notes was made pursuant to a registration statement filed by Teradyne with the Securities and Exchange Commission and is available for review on the SEC's website at www.sec.gov. This press release is neither an offer to sell nor a solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The offering of the notes will be made only by means of a prospectus supplement and related prospectus. Copies of the prospectus supplement and related prospectus for the offering, when available, can be obtained from the joint book-running managers at the following addresses or telephone numbers:

Goldman, Sachs & Co., Attn: Prospectus Department, 85 Broad Street, New York, New York 10004, via fax at 212-902-9316 or via e-mail at prospectus-ny@ny.email.gs.com

Merrill Lynch & Co., 4 World Financial Center, New York, New York 10080

About Teradyne

Teradyne (NYSE:TER) is a leading supplier of Automatic Test Equipment used to test complex electronics used in the consumer electronics, automotive, computing, telecommunications, and aerospace and defense industries.

Safe Harbor Statement

Statements in this release that are not historical in nature are forward-looking statements. Such statements are based on the current assumptions and expectations of Teradyne’s management and are neither promises nor guarantees of future performance. 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 our future results or other forward-looking statements will be achieved. Important factors that could cause actual results to differ materially from those presently expected include: conditions affecting the markets in which Teradyne operates including uncertainties related to the global economy in general, including a continued or further deterioration of the semiconductor equipment market; continued volatility and further deterioration in the financial markets, including uncertainties and disruptions in credit markets and the availability of credit; decreased product demand; delays in new product introductions; lack of customer acceptance of new products; the ability to realize synergies and cost savings from the integration of Eagle Test Systems with Teradyne’s existing operations; difficulties by management in successfully implementing the cost reduction plans; unanticipated delays in or costs and expenses relating to the implementation of the cost reduction plans; the impairment of long-lived assets; and other events, factors and risks previously and from time to time disclosed in filings with the SEC, including, but not limited to, the "Risk Factors” section in the prospectus supplement and related prospectus.