ONTO INNOVATION INC

Rule 10b5-1 Plan Elections

During the fiscal quarter ended March 30, 2024, the following officers, as defined in Rule 16a-1(f) under the Exchange Act, as amended, adopted a “Rule 10b5-1 trading arrangement” as defined in Regulation S-K Item 408, as follows:

On March 7, 2024, Mark R. Slicer, the Company’s Chief Financial Officer, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 1,038 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 March 7, 2025, or earlier if all transactions under the trading arrangement are completed.

On March 11, 2024, Srinivas Vedula, the Company’s Senior Vice President of Customer Success, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of (i) up to 2,467 shares of our common stock and

(ii)up to 100% of the shares of our common stock issued upon the settlement of 596 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 March 6, 2025, or earlier if all transactions under the trading arrangement are completed.