ONTO INNOVATION INC.

Rule 10b5-1 Plan Elections

During the fiscal quarter ended March 31, 2026, the following officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as those terms are defined in Item 408 of Regulation S-K), as follows:

On February 24, 2026, Yoon Ah E. Oh, the Company’s Senior Vice President, General Counsel and Corporate Secretary, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 10,278 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 24, 2027, or earlier if all transactions under the trading arrangement are completed.

On February 25, 2026, Ido Dolev, the Company’s Executive Vice President, Product Solutions Group, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 100.0% of the shares of our common stock issued upon the settlement of 7,187 outstanding RSUs, less the number of shares traded to cover tax withholding obligations in connection with the vesting and settlement of such RSUs. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 24, 2027, or earlier if all transactions under the trading arrangement are completed.

On March 9, 2026, Michael P. Plisinski, the Company’s Chief Executive Officer, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 65,937 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until January 31, 2027, or earlier if all transactions under the trading arrangement are completed.