An anonymous reader writes "HP and ArcSight have signed a definitive agreement for HP to acquire ArcSight, a security and compliance management company, for $43.50 per share, or an enterprise value of $1.5 billion. The acquisition will be conducted by means of a cash tender offer for all of ArcSight's outstanding shares of common stock. The closing of the acquisition, which is subject to customary closing conditions, is expected to occur by the end of the calendar year."
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