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The plunge came on a so-called triple-witching day when stock options, stock index options and stock index futures all expire. The phenomenon, which occurs four times a year, can lead to heightened volatility in share prices. The regulators said that the alleged manipulation and unfair trading were the result of speculative derivatives positions constructed in advance. The purported actions resulted in illegal profits of 44.9 billion won ($40 million), they said. The decline came on a day that South Korea was in the international spotlight as a two-day Group of 20 summit meeting began in Seoul, the country's capital. Coincidentally, Josef Ackermann, Deutsche Bank's chairman and CEO, was in Seoul to participate in a business forum held in conjunction with the summit.
[Associated
Press;
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