Mizuho Securities - Massive Sale Order of J-COM Share Incident

Massive Sale Order of J-COM Share Incident

On 8 December 2005, Mizuho Securities erroneously placed an order to sell 610,000 shares of J-COM Co., Ltd. for one yen each, instead of a commissioned order to sell one share of J-COM Co., Ltd. for 610,000 yen at Tokyo Stock Exchange. J-COM Co., Ltd. (J-COM Holdings Co., Ltd. since December 2009) is a Japanese staffing service company, which was listed on the Mothers (Market of the high-growth and emerging stocks) section of Tokyo Stock Exchange on the day. As a result of this incident, Mizuho Securities accrued a loss of approximately 40.7 billion yen.

Mizuho Securities brought a case for its damages of approximately 41.6 billion yen against the Tokyo Stock Exchange (TSE) insisting that Mizuho Securities could not cancel the order due to a fault in the TSE's computer system, and that TSE negligently failed to suspend the exchange despite the recognition of such an unusual order.

On 4 December 2009, the Tokyo District Court made a judgment ordering TSE to pay Mizuho Securities approximately 10.7 billion yen, holding that: (i) TSE was grossly negligent in leaving its defective system which did not either duly process Mizuho Securities' cancellation or suspend the deal, and (ii) TSE was 70% at fault and Mizuho Securities was 30% at fault under Japanese comparative negligence rules.

Mizuho Securities appealed the case to the Tokyo High Court.

Read more about this topic:  Mizuho Securities

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