Yahoo! Inc Chairman Fred Amoroso is resigning effective immediately, the struggling internet company announced on 25 April.
Amoroso will be replaced in the chairman role by director Maynard Webb Jr on an interim basis until the company's annual shareholder meeting on June 25.
Amoroso, a former IBM Corp executive, will remain on the board of directors until the meeting, Yahoo said.
In a statement on 25 April, Amoroso said he had informed the Yahoo! board when he became chairman in May 2012 that he intended to serve only one year "in order to help Yahoo! during a critical time of transformation".
Following the completion of Amoroso's term at the annual meeting, the Yahoo! board will consist of 10 members, the company said.