Tokyo — Nissan's investigation into alleged misconduct by chairman Carlos Ghosn was expanding to include Renault-Nissan finances, sources told Reuters in a further sign that Nissan may seek to loosen its French parent's hold on their global car-making alliance. According to three informed sources, Nissan told Renault's board on Monday it had evidence of potential wrongdoing at Renault-Nissan, the Dutch venture overseeing alliance operations under Renault's ultimate control. The private communication from Nissan CEO Hiroto Saikawa came as the Japanese carmaker, 43.4% owned by Renault, announced that an investigation had uncovered misconduct involving Ghosn including underreporting of his compensation and personal use of company assets. Renault and Nissan both declined to comment.

Saikawa, once Ghosn's protégé, also disclosed plans to strip Ghosn of his chairmanship, after the 64-year-old industry veteran was arrested in Tokyo along with fellow director Greg Kelly. Neither of th...

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