POWER INTEGRATIONS INC

Rule 10b5-1 Trading Plans

During the three months ended June 30, 2026, none of our directors or executive officers (as defined in Rule 16a-1(f) under the Exchange Act)adopted orterminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any “non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K.

Amendment and Restatement of 2016 Incentive Award Plan

We amended and restated the Power Integrations, Inc. 2016 Incentive Award Plan (the “A&R 2016 Incentive Award Plan”), effective as of June 3, 2026, upon the approval by our stockholders at our 2026 Annual Meeting of Stockholders.

The A&R 2016 Incentive Award Plan was amended and restated to increase the number of shares of our common stock available for issuance thereunder by 2,000,000, for a total of 9,000,000 shares.

The material terms of the A&R 2016 Incentive Award Plan are described in “Proposal 4 - Approval of Amended and Restated 2016 Incentive Award Plan” in our definitive proxy statement on Schedule 14A filed with the United States Securities and Exchange Commission on April 21, 2026, which description is incorporated herein by reference.

The foregoing description of the A&R 2016 Incentive Award Plan is qualified in its entirety by reference to the text of the A&R 2016 Incentive Award Plan, which is filed as Exhibit 10.1 to this Quarterly Report on Form 10-Q and incorporated herein by reference.