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June 20 (Bloomberg) -- Sega Sammy Holdings Inc., publisher of the “Sonic” video-game series, dropped the most in almost three months in Tokyo trading after the company said hackers stole data on almost 1.3 million customers at its European unit.

The stock fell as much as 5.4 percent to 1,475 yen, the biggest drop since March 23, before the decline pared to 1.5 percent at the midday trading break. Personal data, excluding credit card information, on 1.3 million customers at a European unit were accessed, Sega Sammy said in a statement yesterday.

Sega Sammy joins Sony Corp., Lockheed Martin Corp. and Citigroup Inc. among companies that have been hit by hackers in the past three months amid a wave of cyber attacks. The intrusion at Sony, which resulted in the theft of data from more than 100 million accounts, has made investors sensitive to cyber security news, according to Masayuki Ohtani, an analyst at Securities Japan Inc. in Tokyo.

“The Sega Sammy incident revives memories of what happened at Sony,” Ohtani said. "Still, the stock reaction to this probably won’t last beyond today."

To contact the reporter on this story: Kazuyo Sawa in Tokyo at

To contact the editor responsible for this story: Young-Sam Cho at

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