TERADYNE, INC

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 December 31, 2025, the following Section 16 Officers or directors adopted, modified or terminated Rule 10b5-1 trading plans:

Reagan Mills, President of Product Test

Reagan Mills, the President of our Product Test Division, entered into a new Rule 10b5-1 trading plan on November 11, 2025. The Rule 10b5-1 trading plan provides that Mr. Mills, acting through a broker, may sell up to an aggregate of 1,517 shares. Subject to price limits, the first trade under Mr. Mills' Rule 10b5-1 trading plan is scheduled for February 25, 2026. Mr. Mills' plan is scheduled toterminate on April 6, 2026, subject to earlier termination upon the sale of all shares subject to the plan, upon termination by Mr. Mills or the broker, or as otherwise provided in the plan.