"It appears that AMD is the victim of an insider trading scheme," AMD said Thursday. Longoria resigned from the company on Oct. 22, 2010, and AMD has been cooperating with the investigation, the company said.

Shimoon, who worked for Apple partner Flextronics, allegedly "provided highly confidential sales forecast information and new product features for Apple's forthcoming 'iPhone' cellular telephone," the FBI said. He earned $22,000 in consulting fees.

Karunatilaka allegedly provided TSMC sales and shipping information.

The investigation is ongoing, the FBI said.

The IDG News Service