TERADYNE INC

10b 5-1 Trading Plans

Our officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (“Section 16 Officers”) and directors from time to time enter into contracts, instructions or written plans for the purchase or sale of our securities that are intended to satisfy the conditions specified in Rule 10b5-1(c) under the Exchange Act for an affirmative defense against liability for trading in securities on the basis of material nonpublic information. We refer to these contracts, instructions, and written plans as “Rule 10b5-1 trading plans” and each one as a “Rule 10b5-1 trading plan.” During our fiscal quarter ended September 29, 2024, the following Section 16 Officers or directors adopted, modified or terminated Rule 10b5-1 trading plans:

Ryan Driscoll, Vice President, General Counsel, and Secretary

Ryan Driscoll, our Vice President, General Counsel, and Secretary, entered into a new Rule 10b5-1 trading plan on August 8, 2024. The Rule 10b5-1 trading plan provides that Mr. Driscoll, acting through a broker, may sell up to an aggregate of 365 shares plus (1) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 327 restricted stock units on January 27, 2025, (2) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 234 restricted stock units on January 28, 2025, (3) fifty percent of the total number of shares after shares are withheld to pay income taxes received upon the vesting of 221 restricted stock units on January 29, 2025, and (4) fifty percent of the total number of shares received after shares are withheld to pay income taxes upon the vesting of 630 restricted stock units on February 1, 2025. Subject to price limits, the first trade under Mr. Driscoll’s Rule 10b5-1 trading plan is scheduled for January 27, 2025. Mr. Driscoll’s plan is scheduled toterminate on August 1, 2025, subject to earlier termination upon the sale of all shares subject to the plan, upon termination by Mr. Driscoll or the broker, or as otherwise provided in the plan.