Yasuo Hamanaka, a former chief copper trader at Sumitomo Corp., was sentenced to eight years in prison March 26 for fraud and forgery that eventually cost the trading giant some $2.6 billion — the largest trading loss ever.

The Tokyo District Court found Hamanaka, 50, guilty of defrauding Sumitomo’s Hong Kong subsidiary out of $770 million and forging the signatures of his former bosses to conceal his off-the-book trading.

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