https://www.reuters.com/article/us-proofpoint-m-a-thoma-bravo/thoma-bravo-to-take-cybersecurity-firm-proofpoint-private-in-12-3-billion-deal-idUSKBN2CD1H5 >(Reuters) -Private equity firm Thoma Bravo said on Monday it would buy Proofpoint Inc in an all-cash deal that valued the cybersecurity firm at about $12.3 billion, at a time when remote working due to the pandemic has fueled a surge in demand for network security.