July 2 (Reuters) - Alpha and Omega Semiconductor Limited ( AOSL )

has agreed to pay $4.25 million to settle with the U.S.

Department of Commerce for shipping items to China's Huawei

Technologies in violation of export regulations, according to a

department order posted on Wednesday.

AOS engaged in prohibited conduct by forwarding 1,650 power

controllers, smart power stages and related accessories to

Huawei without authorization in 2019, the year Huawei was added

to a restricted U.S. trade list, the order said.

Though the items were foreign designed and produced, the

order said, they were subject to export control regulations

because AOS exported them from the United States. Suppliers to

companies on the restricted trade list, known as the Entity

List, are required to obtain licenses.

U.S. authorities have been investigating AOS' transactions

since 2019, the company said in an SEC filing earlier this year.

In January 2024 the Justice Department closed its investigation

without charges, the filing said, but a civil investigation by

the Commerce Department was ongoing.

On April 16, 2025, AOS said it received a letter from

Commerce alleging violations of export control regulations, and

the company met to discuss a possible resolution.

AOS, which is headquartered in Sunnyvale, California,

operates in both the United States and Asia. It has a wafer

fabrication facility in Hillsboro, Oregon.

In 2020, the United States added to Huawei's Entity listing

to expand its authority to stop shipments of foreign-produced

items to Huawei.

AOS did not immediately respond to a request for comment.