The company involved in an attack by oleg zezev from kazahkstan, in which zezev accessed computer data and copied personal information for purposes of blackmail was

Bloomberg , Inc.

Explanation:

Oleg zezev is Kazakhstani who accessed Bloomberg L.P.’s Manhattan computer system and accessed computer data and copied personal information for purposes of extorting money from Bloomberg in 1999. He was arrested on August 10, 2000 in London, England and prosecuted on February 27, 2003.

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