Thoma Bravo LLC, the private equity firm specializing in recapitalizations, buy-outs, growth equity, acquires Imperva Inc., which engages in the development, market, sale, and support of cyber security solutions for $2.1 billion. Thoma Bravo LLC is adding Imperva to its cybersecurity portfolio in all-cash deal. Thoma Bravo has already invested in other cyber security firms such as DigiCert Inc, Bomgar Corp and LogRhythm Inc. In July, Reuters reported that the private equity firm would buy a majority stake in cybersecurity firm Centrify. By this deal Thoma Bravo LLC is pouring money into the cybersecurity industry, driven by heightened concerns of cyber attacks. Kirkland & Ellis acted as legal advisor to the bidder, while Qatalyst Partners, where the financial advisor and Fenwick & West, legal advisors of the target