FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Chang Stephen Chunping
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)
President
(Last)          (First)          (Middle)

475 OAKMEAD PKWY
3. Date of Earliest Transaction (MM/DD/YYYY)

3/15/2022
(Street)

SUNNYVALE, CA 94085
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 3/15/2022  A  25000 (1)A$0 297434 (2)D  
Common Share 3/15/2022  F  4368 (3)D$48.65 293066 (2)D  
Common Share 3/15/2022  F  3748 (4)D$48.65 289318 (2)D  
Common Share 3/15/2022  A  3750 (5)A$0 293068 (2)D  
Common Share 3/15/2022  A  17500 (6)A$0 310568 (2)(7)D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) The RSU shall vest in equal annual installments over four (4) years from March 15, 2022, provided that the Reporting Person remains in the Issuer's service through each such vesting date.
(2) Includes an aggregate of 46,375 shares subject to Restricted Share Unit awards (RSU) granted on March 15, 2019, March 16, 2020, March 15, 2021, and March 15, 2022 which will be issued as such units vest in accordance with their terms, and excludes 25,000 unvested common shares subject to the PSU granted on March 15, 2022, which may become vested upon achievement of certain corporate performance goals in the future.
(3) Shares withheld to satisfy the Issuer's tax withholding obligation upon the vesting of RSU granted on March 15, 2018, March 15, 2019, March 16, 2020, and March 15, 2021.
(4) Shares withheld to satisfy the Issuer's tax withholding obligation upon the vesting of Performance Share Units (PSU) granted on March 15, 2018, March 16, 2020, and March 15, 2021.
(5) Represents the issuance of common shares upon vesting of one-fourth (1/4) of PSU granted on March 15, 2018. The achievement of specified performance goals for such PSU was certified previously by the Compensation Committee on February 27, 2019, and the issuance common shares thereunder are subject to additional service-based vesting conditions in four equal annual installment commencing in March 2019.
(6) Represents the vesting of PSU granted on March 15, 2021 upon the achievement of specified performance goals as certified previously by the Compensation Committee on February 24, 2022 and the issuance of shares thereunder is subject to vesting in four equal annual installment commencing in March 2022 provided that the Reporting Person remains in the issuer's service through each such vesting date.
(7) Includes 13,125 unvested shares subject to the PSU granted on March 15, 2021 which are subject to vesting upon satisfaction of service-based vesting conditions by the Reporting Person.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Chang Stephen Chunping
475 OAKMEAD PKWY
SUNNYVALE, CA 94085


President

Signatures
/s/ Yanbing Hong, attorney-in-fact for Stephen Chang3/17/2022
**Signature of Reporting PersonDate


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 control number.
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