Mike F. Chang - 16 Mar 2026 Form 4 Insider Report for ALPHA & OMEGA SEMICONDUCTOR Ltd (AOSL)

Role: Director, 10%+ Owner
Signature: /s/ Yanbing Hong, attorney-in-fact for Mike F. Chang
Issuer symbol: AOSL
Transactions as of: 16 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 18 Mar 2026, 16:01:06 UTC
Previous filing: 10 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Chang Mike F	Director, 10%+ Owner	475 OAKMEAD PARKWAY, SUNNYVALE	/s/ Yanbing Hong, attorney-in-fact for Mike F. Chang	18 Mar 2026	0001511393

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AOSL	Common Shares	Award		+22,500	+0.51%	$0.000000^*	4,392,074	16 Mar 2026	Direct	F1, F2, F3, F4
transaction	AOSL	Common Shares	Tax liability		-17,984	-0.41%	$21.43^*	4,374,090	16 Mar 2026	Direct	F2, F3, F4, F5
transaction	AOSL	Common Shares	Tax liability		-9,829	-0.22%	$21.43^*	4,364,261	16 Mar 2026	Direct	F2, F3, F4, F6
transaction	AOSL	Common Shares	Award		+22,500	+0.52%	$0.000000^*	4,386,761	16 Mar 2026	Direct	F2, F3, F4, F7

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The Restricted Share Unit (RSU) shall vest in equal annual installments over four (4) years from March 16, 2026, provided that the Reporting Person remains in the Issuer's service through each such vesting date.
F2	Includes 45,000 unvested shares subject to the Market-Based Performance Share Unit (MSU) granted on July 1, 2018 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.
F3	Includes 35,625 unvested shares subject to the Performance Share Unit (PSU) granted on March 15, 2024 and March 17, 2025 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.
F4	Includes an aggregate of 67,500 shares subject to Restricted Share Unit awards (RSU) granted on March 15, 2023, March 15, 2024, March 17, 2025, and March 16, 2026 which will be issued as such units vest in accordance with their terms, and excludes 22,500 unvested common shares subject to the PSU granted on March 16, 2026, which may become vested upon achievement of certain corporate performance goals in the future.
F5	Shares withheld to satisfy the Issuer's tax withholding obligation upon vesting of Restricted Share Units (RSU) granted on March 15, 2022, March 15, 2023, March 15, 2024, and March 17, 2025.
F6	Shares withheld to satisfy the Issuer's tax withholding obligation upon the vesting of Performance Share Units (PSU) granted on March 15, 2022, March 15, 2024, and March 17, 2025.
F7	Represents PSU granted on March 17, 2025 upon the achievement of specified performance goals as certified previously by the Compensation Committee on March 5, 2026 and the issuance of shares thereunder is subject to vesting in four equal annual installment commencing on March 17, 2026 provided that the Reporting Person remains in the issuer's service through each such vesting date.