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POWER INTEGRATIONS INC

For the period ended Sep 30, 2026. Filed Nov 5, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2026 · Filed Nov 5, 2026

POWI$44.29+10.0%Stored close · as of Nov 9, 2026

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Item 5. Other Information

Rule 10b5-1 Trading Plans

During the three months ended September 30, 2026, Wendy A. Arienzo, amember of our Board of Directors, adopted a trading arrangement, as that term is defined in Item 408(a) of Regulation S-K, that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended. The trading arrangement was adopted on August 12, 2026 and provides for the potential sale of up to 16,391 shares of our common stock and is scheduled to expire on August 12, 2027, subject to earlier termination in accordance with its terms.

During the three months ended September 30, 2026, no other director or executive officer (as defined in Rule 16a-1(f) under the Exchange Act)adopted orterminated a "rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K.

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