Company: AOSL
Filing Date: 2025-09-18
Form Type: DEF 14A
Source: 0001387467-25-000054
Chunk: 2

Company: ALPHA & OMEGA SEMICONDUCTOR Ltd
Filing Date: 2025-09-18
Form: DEF 14A
Chunk 2
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 at the Annual Meeting regardless of whether you attend the Annual Meeting.

By order of the Board of Directors,

Mike F. Chang

Chairman of the Board of Directors

Dated September 18, 2025

<div align='center'>Important Notice Regarding the Availability of Proxy Materials

For the Annual Meeting to be Held on November 12, 2025Taiwan Local Time

(November 11, 2025 U.S. Pacific Standard Time)

The Proxy Statement, Proxy Card and Annual Report on Form 10-K for fiscal year 2025 are available at:</div>

#### http://www.investorvote.com/AOSL

#### Alpha and Omega Semiconductor Limited
<div align='center'>Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda</div>

### PROXY STATEMENT
<div align='center'>FOR THE 2025 ANNUAL GENERAL MEETING OF SHAREHOLDERS

TO BE HELD AT 8:00 A.M. ON NOVEMBER 12, 2025 TAIWAN LOCAL TIME

(AT 4:00 P.M. ON NOVEMBER 11, 2025 U.S. PACIFIC STANDARD TIME)</div>

| TABLE OF CONTENTS                                                                             |     |       |
|                                                                                               |     |  Page |
| Information Regarding the Annual General Meeting                                              |     |     1 |
| Questions and Answers Relating to the Annual General Meeting                                  |     |     2 |
| Proposal No. 1: Election of Directors                                                         |     |     7 |
| Board of Directors and Committees of the Board                                                |     |    11 |
| Compensation of Non-Employee Directors                                                        |     |    21 |
| Executive Compensation Committee Interlocks and Insider Participation                         |     |    23 |
| Proposal No. 2:  Advisory Vote on the Compensation of the Named Executive Officers            |     |    24 |
| Proposal No. 3:  Approval of the Amendment and Restatement of 2018 Omnibus Incentive Plan     |     |    25 |
| Executive Compensation                                                                        |     |    38 |
| Equity Compensation Plan Information                                                          |     |    63 |
| Security Ownership of Certain Beneficial Owners and Management                                |     |    64 |
| Related Party Transactions                                                                    |     |    66 |
| Report of the Audit Committee                                                                 |     |    68 |
| Proposal No. 4:  Ratification of Appointment of Independent Registered