Company: AOSL
Filing Date: 2025-08-28
Form Type: S-8
Source: 0001628280-25-041298
Chunk: 0

Company: ALPHA & OMEGA SEMICONDUCTOR Ltd
Filing Date: 2025-08-28
Form: S-8
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on August 28, 2025</div>

#### Registration No. 333-

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>________________________________</div>

#### FORM S-8

### REGISTRATION STATEMENT

#### Under

#### The Securities Act of 1933
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### ALPHA AND OMEGA SEMICONDUCTOR LIMITED
<div align='center'>(Exact name of registrant as specified in its charter)

________________________________</div>

| Bermuda                         |     | 77-0553536         |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -IRSEmployer       
 Identification No. |

#### Clarendon House

#### 2 Church Street

#### Hamilton HM 11

#### Bermuda
<div align='center'>(Address of principal registered offices) (Zip Code)

________________________________

Alpha and Omega Semiconductor Limited 2018 Omnibus Incentive Plan

(Full title of the Plans)

________________________________</div>

#### Stephen C. Chang

#### Chief Executive Officer

#### c/o Alpha and Omega Semiconductor Incorporated

#### 475 Oakmead Parkway

#### Sunnyvale, California 94085
<div align='center'>(Name and address of agent for service)

(408) 830-9742

(Telephone number, including area code, of agent for service)

________________________________</div>

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer |     | xo |     | Accelerated filer         |     | o |
| Non-accelerated filer   |     | o  |     | Smaller reporting company |     | o |
|                         |     |    |     | Emerging Growth Company   |     | o |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act o

<div align='center