Yamaichi Securities Co., one of the Big Four brokerages, has so far found no illegal transactions with the “sokaiya” corporate extortionist at the center of a growing financial scandal, the firm’s chairman said July 1.

Tsugio Yukihira, speaking at a news conference as the newly appointed chairman of the Japan Securities Dealers Association, said in-house investigations have not revealed any wrongdoing. Yukihira’s comments were effectively a denial of media reports that sokaiya Ryuichi Koike received paybacks through illegal discretionary accounts from three major brokerages, including Yamaichi.

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