Michael L. Pfeiffer - 11 Nov 2025 Form 4 Insider Report for ALPHA & OMEGA SEMICONDUCTOR Ltd (AOSL)

Reporting relationship: Director
Issuer ticker: AOSL
Reported as of: 11 Nov 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 12 Nov 2025, 16:02:30 UTC
Prior SEC filing: 08 Nov 2024
Source filing: View source filing
Reporting owner signature: /s/ Yanbing Hong, attorney-in-fact for Michael L. Pfeiffer

Key filing fact

Michael L. Pfeiffer filed Form 4 for ALPHA & OMEGA SEMICONDUCTOR Ltd (AOSL) on 12 Nov 2025.

Key facts

This page summarizes Michael L. Pfeiffer's Form 4 filing for ALPHA & OMEGA SEMICONDUCTOR Ltd (AOSL).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 12 Nov 2025, 16:02.

Change

Previous filing in this sequence was filed on 08 Nov 2024.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001598738 Primary reporting owner

Pfeiffer Michael L

Relationship: Director
Address: C/O ALPHA & OMEGA SEMICONDUCTOR LIMITED, 475 OAKMEAD PARKWAY, SUNNYVALE
Signature: /s/ Yanbing Hong, attorney-in-fact for Michael L. Pfeiffer
Signature date: 12 Nov 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AOSL transaction

Common Shares

Award

Transaction value: $0
Shares: +5,681
Change %: +8.7%
Price: $0.000000
Shares after: 71,294
Date: 11 Nov 2025
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Represents the Issuer's common shares subject to restricted share units (RSUs) award granted to the Reporting Person for services on the Board of Directors of the Issuer under the Issuer's 2018 Omnibus Incentive Plan. The RSUs will vest in four (4) successive equal quarterly installments upon the Reporting Person's completion of each quarter of Board service following the grant date.