Cybersecurity company Proofpoint, owned by private equity firm Thoma Bravo, will acquire Israeli data security firm Varonis Systems in an all-cash deal valued at approximately $6.3 billion, the companies announced. Under the agreement, Varonis shareholders will receive $49.75 in cash per share. The offer values Varonis' equity at $5.71 billion. The company's stock rose about 2.7% in after-hours trading on Wall Street. The transaction is expected to be completed in the first half of 2027.