Proofpoint has agreed to acquire Varonis Systems in an all-cash transaction valued at about 6.3 billion dollars, the companies announced on October 15, 2026. The definitive agreement brings together Proofpoint, a specialist in protecting people and AI agents against cyber threats, with Varonis, a Miami-based firm focused on data and AI security. Proofpoint is a portfolio company of private equity firm Thoma Bravo.
Under the terms, Varonis shareholders will receive 49.75 dollars per share in cash. That is a 52 percent premium to its 32.71 dollar close on June 22, before initial sale rumors, and a 17 percent premium to its 42.35 dollar close on September 1. The price values Varonis at roughly 53 times last-twelve-months free cash flow and 8.4 times revenue.
The logic of the deal is access. Varonis built its business on finding sensitive data in file servers and cloud storage, classifying it, mapping who can open it, and tracking how employees and systems use it. Its newer tools extend that work to AI, looking for exposed data and tightening permissions. Proofpoint started in email security and now protects communications and data across email, cloud services, and collaboration tools.
Put together, the companies argue, a security team could connect a suspicious message or identity with the sensitive information actually at risk. That matters as AI agents begin reading files and taking action across business systems. Knowing what an agent can reach, whether it needs that access, and what it does with the data is becoming as important as blocking the phishing email that starts an attack.
The combined company will serve more than 16,000 enterprises and millions of organizations worldwide, which the firms say will make it one of the largest pure-play cybersecurity companies and the largest organization focused on data and AI security. Proofpoint says more than 80 of the Fortune 100 already use its products. After closing, it plans to integrate the two product sets, align sales efforts, and move quickly to deliver a combined platform, although the announcement did not lay out a detailed rollout schedule.
The transaction is expected to close in the first half of 2027, subject to Varonis shareholder approval and regulatory approvals. Varonis's board approved the deal unanimously. Thoma Bravo has committed equity funding and secured debt commitments, and Ontario Teachers' Pension Plan will also invest in Proofpoint. Until closing, the two companies will operate independently. Once the deal completes, Varonis will become private and its shares will leave the Nasdaq exchange.
The acquisition caps months of speculation. Reports in June said Varonis was weighing a sale after interest from private equity firms, and Reuters reported in September that Proofpoint was in talks to buy it. It is also the largest deal since Thoma Bravo took Proofpoint private in 2021 for about 12.3 billion dollars, a run that included German Microsoft 365 security provider Hornetsecurity. Varonis will report third-quarter results on November 3, but will not hold an earnings call.
For enterprise IT leaders, the question now is integration. A single platform that spans email, identity, permissions, and data could simplify buying and investigations, but customers will want clear product roadmaps and pricing before the close. For now, the deal signals where security spending is heading: toward controlling the data that AI systems can see.