said T.H. Tan, the company's chief executive, plans to retire sometime late in 2006, leaving the post he has held since 1999.
The company, a maker of thin-film disks for hard drives, said it has started a search for a successor. Komag will consider both internal and external candidates.
Prior to his appointment as CEO, Tan served as Komag's senior vice president of worldwide operations. He joined the company in 1989.
Shares of Komag were dropping 42 cents, or 0.9%, to $47.50 in after-hours trading.