Proofpoint, owned by private equity firm Thoma Bravo, agreed on Thursday to buy data security company Varonis. The $49.75 cash price is a 52 percent premium to Varonis’s closing price of $32.71 on June 22, the last full trading day before sale rumors first appeared. It is also a 17 percent premium to the September 1 close of $42.35. The companies said the transaction values Varonis equity at about $5.71 billion and places the deal at roughly 8.4 times trailing twelve-month revenue and 53 times free cash flow.
Varonis finds sensitive data across cloud, SaaS, and on-premises systems, maps who can reach it, and watches how people and agents use it. The company has added controls for how employees and AI agents interact with AI tools. Proofpoint built its business around protecting people, mainly by stopping phishing and other attacks that arrive through email and collaboration tools. Earlier in 2026 Proofpoint acquired Acuvity to add monitoring of AI tool use and agent behavior.
Both companies describe the combination as a way to protect data that AI systems can now reach and act on. Proofpoint CEO Sumit Dhawan said the data AI can access determines both its value and its risk. Varonis CEO Yaki Faitelson said the company’s mission is to secure AI and the data that powers it, and that joining Proofpoint lets them do that faster. The companies said the combined organization will serve more than 16,000 enterprises.
Nothing changes until the deal closes
Proofpoint and Varonis will continue to operate as separate companies until the transaction closes. Products, contracts, support, and account teams stay in place. After close, the companies said they intend to simplify account management and integrate the complementary technologies. No product decisions have been announced. Customers who already use both products keep their existing relationships for now.
Thoma Bravo is providing committed equity financing and has secured debt financing commitments. Ontario Teachers’ Pension Plan has also agreed to invest in Proofpoint in connection with the deal. Varonis’s board approved the agreement unanimously. Closing still requires Varonis shareholder approval and regulatory clearances. One company FAQ listed an expected close in the first quarter of 2027; the joint announcement and most coverage said the first half of 2027.
What the two products actually do
- Varonis classifies data and reduces exposure across storage and SaaS systems, then detects misuse through behavior monitoring. It has extended that work to AI agents.
- Proofpoint watches email and collaboration channels for phishing and other attacks, and tracks insider risk. Its Acuvity acquisition added visibility into AI tool interactions and agent actions.
- The stated plan is to connect data posture, access governance, behavioral signals, and AI controls so a security team can see both what data exists and how people or agents use it.
Varonis has competed in the data security posture management market and has built integrations into Microsoft Purview. Proofpoint has long been a standard control for large enterprises that need to monitor what employees send and receive. The combination is meant to sit next to those existing controls rather than replace them immediately.
Earlier coverage on shashi.co looked at Varonis’s approach to automatic remediation against Microsoft Purview and at Proofpoint’s Acuvity acquisition for AI agent monitoring. Those pieces described the separate product directions that this deal now places under one owner.
Sources
- Proofpoint. “Proofpoint Signs Definitive Agreement to Acquire Varonis.” Press release and FAQ, 15 Oct. 2026, www.proofpoint.com/us/proofpoint-signs-definitive-agreement-to-acquire-varonis.
- Reuters. “Thoma Bravo's Proofpoint to buy Varonis Systems in $6.3 billion all-cash deal.” 15 Oct. 2026, www.reuters.com/legal/transactional/proofpoint-buy-varonis-systems-63-billion-all-cash-deal-2026-10-15/.
- SecurityWeek. “Proofpoint Inks $6.3 Billion All-Cash Deal to Acquire Varonis.” 16 Oct. 2026, www.securityweek.com/proofpoint-inks-6-3-billion-all-cash-deal-to-acquire-varonis/.
