Investor's Business Daily - The largest U.S. mobile carrier was among the companies that had the email addresses of customers exposed in a massive online data breach last week. In what could be one of the biggest online attacks, a hacker penetrated online marketer Epsilon, a unit of Alliance Data Systems , which controls email databases for 50 companies. Verizon Communications' wireless unit, the largest U.S. mobile carrier and a joint venture of Verizon and Vodafone (NASDAQ:VOD - News), said only email addresses were exposed. Verizon dipped 0.1%. Alliance rose 0.5%.
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