 Shares of Proofpoint Inc. rocketed 32.0 in premarket trading, putting them on track to open well above its record closing price, after the cybersecurity and compliance company announced an agreement to be acquired by private equity firm Thoma Bravo in a cash deal that values the company at 12.3 billion. Under terms of the deal, Proofpoint shareholders will receive 176.00 in cash for each Proofpoint shares they own, which is 33.6 above Fridays closing price of 131.78. 