TOKYO, May 25 (Reuters) - Shareholders of Japan's Seven & i Holdings Co Ltd on Thursday voted down all four of the board candidates nominated by ValueAct Capital, dismissing the U.S. investment firm's attempt to shake up the retail giant's board.

ValueAct, long critical of the 7-Eleven convenience store operator's conglomerate structure, called for President Ryuichi Isaka to be among those replaced with its candidates. Isaka and other candidates backed by the company were all elected at its annual shareholders meeting. (Reporting by Makiko Yamazaki and Mayu Sakoda; Editing by David Dolan)