Symantec Corp. (Nasdaq: SYMC)  is preparing to acquire Blue Coat Systems Inc. for about $4.65 billion in cash, a deal that will add to its cyberdefense technology and fill a high-turnover chief executive officer position.

There has been a steady stream of cybersecurity deals in the middle market. Cryptosoft bought DeviceAuthority Inc.; FireEye Inc. (Nasdaq: FEYE) purchased iSight Partners; and MGT Capital Investments Inc. (NYSE MKT: MGT) is acquiring technology and assets from Demonsaw LLC.

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