 Private equity investment firm Thoma Bravo Advantage NYSE: TBA inked an agreement to acquire cybersecurity and compliance company Proofpoint, Inc NASDAQ: PFPT in an all-cash transaction valuing Proofpoint at 12.3 billion. Proofpoint stockholders will receive 176 per share, signifying a 34 premium on Proofpoints Apr. 23, 2021 closing price. 