Former Yahoo Chief Executive Marissa Mayer and the current and former CEOs of Equifax Inc (EFX.N) will testify before a U.S. Senate panel on Nov. 8 on two massive data breaches, the committee said Wednesday. Verizon Communications Inc (VZ.N), the largest U.S. wireless operator, acquired most of Yahoo Inc's assets in June. Yahoo disclosed in October that a 2013 data breach affected all 3 billion of its accounts, compared with an estimate of more than 1 billion disclosed in December.

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