144 0001182413 XXXXXXXX LIVE 0000833640 POWER INTEGRATIONS, INC. 000-23441 5245 Hellyer Avenue San Jose CA 95138-1002 (408) 414-9200 CLIFFORD J WALKER Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

14700 1130692.17 55719984 05/26/2026 NASDAQ Common 01/29/2025 Restricted stock vesting under a registered plan Issuer N 614 01/29/2025 Cash Common 01/30/2025 Restricted stock vesting under a registered plan Issuer N 1485 01/30/2025 Cash Common 01/31/2025 Shares Purchased through Employee Stock Purchase Plan Issuer N 225 01/31/2025 Cash Common 02/05/2025 Restricted stock vesting under a registered plan Issuer N 640 02/05/2025 Cash Common 02/07/2025 Restricted stock vesting under a registered plan Issuer N 933 02/07/2025 Cash Common 02/09/2025 Restricted stock vesting under a registered plan Issuer N 1460 02/09/2025 Cash Common 04/01/2025 Restricted stock vesting under a registered plan Issuer N 1912 04/01/2025 Cash Common 07/31/2025 Shares Purchased through Employee Stock Purchase Plan Issuer N 207 07/31/2025 Cash Common 01/25/2026 Restricted stock vesting under a registered plan Issuer N 276 01/25/2026 Cash Common 01/26/2026 Restricted stock vesting under a registered plan Issuer N 1058 01/26/2026 Cash Common 01/27/2026 Restricted stock vesting under a registered plan Issuer N 651 01/27/2026 Cash Common 01/29/2026 Restricted stock vesting under a registered plan Issuer N 477 01/29/2026 Cash Common 01/30/2026 Restricted stock vesting under a registered plan Issuer N 630 01/31/2026 Cash Common 01/31/2026 Shares Purchased through Employee Stock Purchase Plan Issuer N 1390 01/31/2026 Cash Common 02/02/2026 Restricted stock vesting under a registered plan Issuer N 781 02/02/2026 Cash Common 02/06/2026 Restricted stock vesting under a registered plan Issuer N 1951 02/06/2026 Cash Common 02/09/2026 Restricted stock vesting under a registered plan Issuer N 10 02/09/2026 Cash N CLIFFORD J WALKER

5245 Hellyer Avenue San Jose CA 95138-1002

Common 05/13/2026 20339 1467053.11 CLIFFORD J WALKER

5245 Hellyer Avenue San Jose CA 95138-1002

Common 05/12/2026 9361 667036.78 05/26/2026 /s/ Clifford Walker