Proofpoint Agrees to Buy Varonis for $6.3 Billion in Bet on AI Data Security

Proofpoint, the Sunnyvale, California, cybersecurity company owned by private equity firm Thoma Bravo, agreed on Thursday, Oct. 15, 2026, to buy data security company Varonis Systems in an all-cash deal valued at about $6.3 billion. Varonis shareholders will receive $49.75 per share, and the companies expect to close in the first half of 2027, after which Varonis will leave the Nasdaq.

Proofpoint-Varonis Deal at a Glance: Size, Dates and Terms

• Size: about $6.3 billion, all cash.
• Price: $49.75 per Varonis share. That is a 52% premium to Varonis’ $32.71 close on June 22, 2026, the last full trading day before the first reports of a possible sale, and a 17% premium to its $42.35 close on Sept. 1, before further reports of sale talks.
• Valuation: about 8.4 times Varonis’ trailing 12-month revenue and about 53 times trailing free cash flow, as of June 30, 2026, according to the companies.
• Signed: Oct. 15, 2026, with the Varonis board’s unanimous approval.
• Expected close: first half of 2027.
• Conditions: approval by a majority of Varonis shareholders, expiration of the U.S. Hart-Scott-Rodino antitrust waiting period, and certain foreign regulatory clearances. The deal is not subject to a financing condition.
• Financing: committed equity from Thoma Bravo plus secured debt commitments. Ontario Teachers’ Pension Plan also agreed to invest in Proofpoint in connection with the deal.

What the Two Companies Do

Varonis, based in Miami, sells software that maps where a company’s sensitive files and data live, who can reach them and how they are being used, and it offers round-the-clock managed detection and response. It now markets itself as a company that “secures AI and the data that powers it.”

Proofpoint is best known for email security and describes itself as a leader in “human and agent cybersecurity,” protecting how people, data and AI agents connect across email, cloud and collaboration tools. Proofpoint says it serves more than 80 of the Fortune 100 and over 14,000 large enterprises. Thoma Bravo took Proofpoint private in 2021 for about $12.3 billion.

Context: AI Agents Are Reshaping Cybersecurity

The deal is a bet that AI will make data security more important, not less. As companies connect AI assistants and autonomous “agents” to internal systems, those tools can reach sensitive records and take actions. Security buyers increasingly want one platform that knows what data exists, who and what can access it, and how it moves.

That theme runs through this fall’s tech news, from our coverage of Nvidia’s open agent safety platform to rising concern about AI incidents. It also lands in a nervous market: tech stocks just posted their worst week since June on worries about AI spending and debt.

Impact: What It Means for Customers, Shareholders and the Market

The combined company will serve more than 16,000 enterprises, according to the announcement, and plans to offer a single platform to find and protect sensitive data, control what people and AI can access, and stop data loss. Proofpoint said it intends to move quickly on integration after closing. Until then, the two companies will operate separately.

For Varonis shareholders, the deal locks in a cash price. Shares closed at $47.34 on Oct. 15 before the announcement, so the offer was only about 4.8% above that last close, according to an analysis by The Inference; most of the 52% headline premium built up after sale reports in June and September. Varonis shares rose about 2.7% in after-hours trading, Investing.com reported. TD Cowen had raised its price target on the stock to $56 two days before the signing, and the stock’s 52-week high is $63.80, both above the offer.

Varonis will report third-quarter results after the market closes on Nov. 3 but will not hold an earnings call because of the pending deal.

Advisors

Goldman Sachs is Varonis’ exclusive financial advisor, with Paul Hastings as legal counsel. BofA Securities, Morgan Stanley, J.P. Morgan, UBS and Mizuho are advising Proofpoint, with Kirkland & Ellis as legal counsel.

Reactions

“Our mission is to secure AI and the data that powers it. By joining forces with Proofpoint, we can achieve this mission faster than ever,” Varonis co-founder, chief executive and chairman Yaki Faitelson said. He said a committee of independent directors reached out to “a range of potential strategic and financial buyers” before agreeing to the sale.

“AI agents are increasingly accessing sensitive information and taking action across systems,” Proofpoint chief executive Sumit Dhawan said in the announcement, calling the deal “a defining step in Proofpoint’s evolution into a cybersecurity platform built for the future of AI.” Dhawan told CNBC’s “Squawk on the Street” on Oct. 16 that “opportunities like this don’t come every day.”

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Featured photo: Raysonho @ Open Grid Scheduler / Scalable Grid Engine / Wikimedia Commons, CC0. Cropped and resized.

Sources

• Proofpoint: Proofpoint to Acquire Varonis in a $6.3 Billion Transaction (Oct. 15, 2026)
• Varonis Form 8-K merger agreement summary (via StockTitan)
• CNBC: Proofpoint CEO on acquiring Varonis for $6.3B
• Investing.com: Varonis stock climbs on $6.3 billion Proofpoint deal
• The Inference: Thoma Bravo pays $6.3 billion for Varonis