3. Two big mergers were announced this week. First, AppRiver acquired Total Defense, a leading provider of consumer subscription-based endpoint security tools. Terms weren’t disclosed. Also, the investment firm Thoma Bravo is taking Imperva private for $2.1B, which is a third premium over its current stock value. Bravo also owns Barracuda Networks and has minority investments in McAfee and Sailpoint, among other tech companies. Imperva’s annual revenues are more than $300M and they recently acquired Prevoty earlier this summer.