Equity grant and tax withholding updated by Alpha & Omega (AOSL) director

Rhea-AI Filing Summary

ALPHA & OMEGA SEMICONDUCTOR Ltd director Mike F. Chang filed an amended insider report covering restricted share unit activity. On March 16, 2026, 14,419 Common Shares were disposed of to cover tax withholding on RSU vesting, and 22,500 Common Shares were acquired as a grant. After these changes, Chang directly held 4,390,326 Common Shares. The amendment corrects the number of shares previously reported as withheld for taxes and does not reflect any open-market buying or selling.

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

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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^*

Chang Mike F

(Last) (First) (Middle)

475 OAKMEAD PARKWAY

(Street)

SUNNYVALE CALIFORNIA 94085

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
03/18/2026

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	03/16/2026		F		14,419(1)	D	$21.43	4,355,155	D
Common Shares	03/16/2026		A		22,500	A	$0	4,390,326	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. This amended Form 4 is being filed to correct inadvertent errors in one transaction reported in the original Form 4 relating to the number of shares withheld to satisfy the Issuer's tax withholding obligations upon vesting of certain Restricted Share Units (RSUs).

Remarks:

	/s/ Yanbing Hong, attorney-in-fact for Mike F. Chang	03/25/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Mike F. Chang report at ALPHA & OMEGA SEMICONDUCTOR (AOSL)?

Mike F. Chang reported two non-market transactions: a grant of 22,500 Common Shares and a tax-related disposition of 14,419 Common Shares on March 16, 2026. These reflect equity compensation and tax withholding, not open-market trading.

Why was this Form 4/A for ALPHA & OMEGA SEMICONDUCTOR (AOSL) amended?

The Form 4/A was amended to correct errors in the number of shares withheld for taxes on vested RSUs. The footnote states it fixes the previously misreported count related to satisfying the issuer’s tax withholding obligations upon RSU vesting.

Did Mike F. Chang buy or sell AOSL shares on the open market?

No open-market trades were reported. The disposition of 14,419 shares was for tax withholding, and the acquisition of 22,500 shares was a grant. Both are compensation-related entries, not discretionary market purchases or sales.

How many AOSL shares does Mike F. Chang hold after these transactions?

Following the reported transactions, Mike F. Chang directly held 4,390,326 Common Shares. This figure reflects his position after the RSU grant of 22,500 shares and the 14,419-share tax-withholding disposition recorded on March 16, 2026.

What does the tax-withholding transaction mean for AOSL shareholders?

The tax-withholding transaction represents 14,419 shares delivered to satisfy tax obligations on RSU vesting. It is a routine administrative step associated with equity compensation and does not indicate any strategic decision to buy or sell AOSL shares in the market.

What type of acquisition was reported in the AOSL Form 4/A filing?

The acquisition was a grant or award of 22,500 Common Shares at a reported price of $0.0000 per share, indicating an equity compensation award. This increased Mike F. Chang’s direct holdings as part of his compensation package.