Thoma Bravo-owned cybersecurity company Proofpoint plans to buy data security firm Varonis Systems in an all-cash deal valued at about $6.3B (Jaspreet Singh/Reuters)

Jaspreet Singh / Reuters:
Thoma Bravo-owned cybersecurity company Proofpoint plans to buy data security firm Varonis Systems in an all-cash deal valued at about $6.3B  —  Thoma Bravo-owned cybersecurity company Proofpoint will buy data security firm Varonis Systems (VRNS.O) in all-cash deal valued at about $6.3 billion, the companies said on Thursday.