[Form 4] ALPHA & OMEGA SEMICONDUCTOR Ltd Insider Trading Activity

Rhea-AI Filing Summary

Alpha & Omega Semiconductor (AOSL) disclosed a Form 4 by CFO and Corporate Secretary Yifan Liang. On 10/17/2025, Liang reported a Code G transaction, a gift of 300 common shares at $0. After the transaction, Liang beneficially owned 280,536 shares directly.

Holdings include 45,000 unvested MSUs granted 7/1/2018 (service-based vesting), 16,512 unvested PSUs from 3/15/2022 and 3/15/2024 (service-based), and 50,000 RSUs granted on 3/15/2022, 3/15/2023, 3/15/2024, and 3/17/2025 that will be issued as they vest. It excludes 22,500 unvested PSUs granted 3/17/2025, which may vest upon achievement of corporate performance goals. ESPP activity reflects 875 shares acquired on 5/14/2025.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Liang Yifan

(Last) (First) (Middle)

475 OAKMEAD PARKWAY

(Street)

SUNNYVALE CA 94085

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ALPHA & OMEGA SEMICONDUCTOR Ltd [ AOSL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CFO and Corp Secretary

3. Date of Earliest Transaction (Month/Day/Year)
10/17/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	10/17/2025		G		300	D	$0	280,536(1)(2)(3)(4)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. Includes 16,512 unvested shares subject to the Performance Share Unit (PSU) granted on March 15, 2022 and March 15, 2024 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.

3. Includes an aggregate of 50,000 shares subject to Restricted Share Unit awards (RSU) granted on March 15, 2022, March 15, 2023, March 15, 2024, and March 17, 2025 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 17, 2025, which may become vested upon achievement of certain corporate performance goals in the future.

4. Reflects 875 shares acquired under the Issuer's Employee Stock Purchase Plan on May 14, 2025.

Remarks:

	/s/ Yanbing Hong, attorney-in-fact for Yifan Liang	10/20/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did AOSL report on Form 4?

A gift of 300 common shares (Transaction Code G) by CFO and Corporate Secretary Yifan Liang on 10/17/2025 at $0.

How many AOSL shares did the insider own after the transaction?

Liang beneficially owned 280,536 shares directly following the reported transaction.

What does Transaction Code G indicate on Form 4?

Code G indicates a gift of securities.

Which equity awards are included in the reported beneficial ownership for AOSL?

Includes 45,000 unvested MSUs (granted 7/1/2018), 16,512 unvested PSUs (granted 3/15/2022 and 3/15/2024), and 50,000 RSUs (granted 3/15/2022, 3/15/2023, 3/15/2024, 3/17/2025).

Which awards are excluded from the insider’s current beneficial ownership?

Excludes 22,500 unvested PSUs granted on 3/17/2025 that may vest upon achievement of corporate performance goals.

Was there recent ESPP activity for the insider at AOSL?

Yes. The filing reflects 875 shares acquired under the ESPP on 5/14/2025.

Who filed the Form 4 for AOSL and in what capacity?

It was filed for Yifan Liang, AOSL’s CFO and Corporate Secretary, as a single reporting person.