Yahoo Inc. co-founder Jerry Yang is stepping down as chief executive, ending a rocky reign marked by his refusal to sell the Internet company to Microsoft Corp. for $47.5 billion — more than triple Yahoo's current market value.

The change in command announced Nov. 17 won't be completed until Yahoo finds his replacement. The Sunnyvale, California-based company said it is interviewing candidates inside and outside Yahoo in a search led by its chairman, Roy Bostock.

Yang, who started Yahoo with Stanford University classmate David Filo in 1994, will revert to "Chief Yahoo," a titular role he filled before replacing former movie studio boss Terry Semel as CEO in June 2007. He will also remain on Yahoo's board of directors.