Insider Mike F. Chang buys 33,727 ALPHA & OMEGA (AOSL) shares at $19

Rhea-AI Filing Summary

ALPHA & OMEGA SEMICONDUCTOR Ltd director and 10% owner Mike F. Chang made an open-market purchase of 33,727 common shares at $19.00 per share. This buy on March 9, 2026 increased his direct holdings to 4,369,574 common shares.

His reported position includes 41,670 unvested shares from performance share units granted on March 15, 2022 and March 15, 2024, 45,000 unvested shares from MSUs, and 86,875 shares underlying restricted share unit awards that will be issued as they vest. It excludes 22,500 unvested common shares tied to a performance share unit grant from March 17, 2025 that vest only if certain corporate performance goals are achieved.

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 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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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	03/09/2026		P		33,727	A	$19(1)	4,369,574(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. The price reported in Column 4 is the exact price at which all shares were purchased.

2. Includes 41,670 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 45,000 unvested shares subject to the MSU which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.

4. Includes an aggregate of 86,875 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.

Remarks:

	/s/ Yanbing Hong, attorney-in-fact for Mike F. Chang	03/10/2026
	** 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).
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FAQ

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

Mike F. Chang reported an open-market purchase of 33,727 common shares at $19.00 per share. The transaction occurred on March 9, 2026 and increased his directly held stake to 4,369,574 common shares, according to the Form 4 filing details.

What is Mike F. Chang’s total reported share ownership in AOSL after this Form 4?

After the purchase, Mike F. Chang directly holds 4,369,574 common shares. This figure includes multiple unvested awards, such as performance share units, MSUs, and restricted share units that are scheduled to vest over time as service and performance conditions are satisfied.

At what price did the AOSL insider buy shares in this Form 4 transaction?

The insider purchased the 33,727 common shares at an exact price of $19.00 per share. A footnote clarifies that this was the precise price for all shares in the trade, indicating it was a straightforward open-market purchase at a single execution price.

How many unvested performance-related AOSL shares are included in Mike F. Chang’s holdings?

His holdings include 41,670 unvested shares from performance share units granted in March 2022 and March 2024, plus 45,000 unvested MSU shares. These awards are subject to service-based vesting conditions that must be met before the shares fully vest to him.

What restricted share units (RSUs) are reported for AOSL’s Mike F. Chang in this filing?

The filing notes 86,875 shares subject to restricted share unit awards granted across several grant dates from March 2022 through March 2025. These shares will be issued as the RSUs vest under their terms, adding to his position over time as conditions are met.

Are any AOSL performance share units excluded from Mike F. Chang’s current share total?

Yes. The report excludes 22,500 unvested common shares linked to a performance share unit grant from March 17, 2025. Those shares may only become vested if specified corporate performance goals are achieved in the future, so they are not counted yet.