144 0001389039 XXXXXXXX LIVE 0000833640 POWER INTEGRATIONS, INC. 000-23441 5245 Hellyer Avenue San Jose CA 95138 (408) 414-9200 DOUGLAS BAILEY Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

8549 555384.93 56864621 11/11/2024 NASDAQ Common 02/06/2020 Restricted stock vesting under a registered plan Issuer N 3202 02/06/2020 Compensation Common 02/07/2023 Performance Stock Units Issuer N 1471 02/07/2023 Compensation Common 02/13/2020 Restricted stock vesting under a registered plan Issuer N 1832 02/13/2020 Compensation Common 01/26/2020 Restricted stock vesting under a registered plan Issuer N 2044 01/26/2020 Compensation Y Sales that were executed on November 11, 2024 are being reported on this Form 144 filed on November 12, 2024 given the EDGAR system was not accepting filings on November 11, 2024 in observance of the federal holiday. 11/11/2024 /s/ Douglas Bailey