Alpha & Omega (NASDAQ: AOSL) CEO sells 5,594 shares under 10b5-1 plan

Rhea-AI Filing Summary

ALPHA & OMEGA SEMICONDUCTOR Ltd Chief Executive Officer Stephen Chunping Chang sold 5,594 common shares on April 14, 2026 in an open-market transaction at $31.90 per share. The sale was made under a pre‑arranged Rule 10b5-1 trading plan adopted on September 8, 2025.

Following the sale, he directly holds 650,785 common shares, which include 22,500 unvested Market-Based Performance Share Units, 79,375 unvested Performance Share Units, and 161,250 shares tied to Restricted Share Unit awards. This figure excludes 67,500 unvested common shares under a later PSU grant that depend on future corporate performance goals.

Insider Trade Summary 10b5-1

Net Seller: 5,594 shares ($178,449)

Net Sell 1 txn

Insider Chang Stephen Chunping

Role Chief Executive Officer

Sold 5,594 shs ($178K)

Type	Security	Shares	Price	Value
Sale	Common Share	5,594	$31.90	$178K

Holdings After Transaction: Common Share — 650,785 shares (Direct)

Footnotes (1)

1. The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 8, 2025. The price reported in Column 4 is the exact price at which all shares were sold. Includes 22,500 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. Includes 79,375 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. Includes an aggregate of 161,250 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 67,500 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.

Key Figures

Shares sold: 5,594 shares Sale price: $31.90 per share Shares held after transaction: 650,785 shares +4 more

7 metrics

Shares sold 5,594 shares Open-market sale on April 14, 2026

Sale price $31.90 per share Exact price for all shares sold

Shares held after transaction 650,785 shares Direct ownership following April 14, 2026 sale

Unvested MSU shares 22,500 shares Market-Based Performance Share Units granted July 1, 2018

Unvested PSU shares (2024 & 2025 grants) 79,375 shares Performance Share Units granted March 15, 2024 and March 17, 2025

RSU awards 161,250 shares Restricted Share Units granted 2023–2026, issuable upon vesting

Excluded PSU shares 67,500 shares PSU granted March 16, 2026; vesting tied to corporate performance

Key Terms

Rule 10b5-1 trading plan, Market-Based Performance Share Unit (MSU), Performance Share Unit (PSU, Restricted Share Unit awards (RSU), +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The sales were effected pursuant to a Rule 10b5-1 trading plan adopted..."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Market-Based Performance Share Unit (MSU) financial

"Includes 22,500 unvested shares subject to the Market-Based Performance Share Unit (MSU)..."

Performance Share Unit (PSU financial

"Includes 79,375 unvested shares subject to the Performance Share Unit (PSU) granted..."

Restricted Share Unit awards (RSU) financial

"Includes an aggregate of 161,250 shares subject to Restricted Share Unit awards (RSU)..."

unvested common shares financial

"excludes 67,500 unvested common shares subject to the PSU granted on March 16, 2026..."

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

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 Stephen Chunping

(Last) (First) (Middle)

475 OAKMEAD PKWY

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/14/2026

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)

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 Share	04/14/2026		S		5,594(1)	D	$31.9(2)	650,785(3)(4)(5)	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 sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 8, 2025.

2. The price reported in Column 4 is the exact price at which all shares were sold.

3. Includes 22,500 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.

4. Includes 79,375 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.

5. Includes an aggregate of 161,250 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 67,500 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.

Remarks:

	/s/ Yanbing Hong, attorney-in-fact for Stephen Chang	04/16/2026
	** 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 transaction did AOSL CEO Stephen Chunping Chang report?

Stephen Chunping Chang reported selling 5,594 Alpha & Omega Semiconductor common shares at $31.90 per share in an open-market transaction. The trade occurred on April 14, 2026 and was executed under a pre-arranged Rule 10b5-1 trading plan adopted in September 2025.

How many AOSL shares does the CEO hold after this Form 4 sale?

After the transaction, the CEO directly holds 650,785 common shares of Alpha & Omega Semiconductor. This total includes multiple unvested equity awards such as Market-Based Performance Share Units, Performance Share Units, and Restricted Share Units that will vest over time subject to service conditions.

Was the AOSL CEO’s share sale part of a Rule 10b5-1 plan?

Yes. The sale was carried out under a Rule 10b5-1 trading plan adopted by Stephen Chunping Chang on September 8, 2025. Such plans pre-schedule trades, allowing insiders to systematically sell shares over time under predetermined conditions.

What unvested Market-Based Performance Share Units does the AOSL CEO hold?

The CEO’s holdings include 22,500 unvested Market-Based Performance Share Units granted on July 1, 2018. These MSUs are subject to service-based vesting conditions, meaning they will only convert into shares if Chang continues to meet specified employment tenure requirements.

What Performance Share Units are included in the AOSL CEO’s current holdings?

His position includes 79,375 unvested shares tied to Performance Share Units granted on March 15, 2024 and March 17, 2025. These PSUs vest based on service-related conditions and represent additional potential share ownership as vesting milestones are satisfied.

How many Restricted Share Units are in the AOSL CEO’s equity awards?

The CEO’s equity package includes 161,250 shares subject to Restricted Share Unit awards granted between March 2023 and March 2026. These RSUs will be issued as the underlying units vest according to their terms, adding to his share ownership over time.

Which AOSL Performance Share Units are excluded from the CEO’s current share total?

The total of 650,785 shares excludes 67,500 unvested common shares linked to a Performance Share Unit grant dated March 16, 2026. Those units may vest only if specified corporate performance goals are achieved in future periods.