Advanced Micro Devices on Wednesday announced a new $6 billion stock buyback plan, joining a string of chipmakers that are looking to reduce their float as the AI trade that has powered their shares shows some signs of slowing.

Shares of semiconductor manufacturer AMD were up Wednesday after a big stock buyback authorization. Here's what that means.

AMD said on Wednesday that its board of directors approved $6 billion in share buybacks. The stock climbed 8%. The authorization is in addition to $4 billion in existing approved share repurchases, the company said.