Proofpoint, a cybersecurity firm backed by Thoma Bravo, is in talks to acquire Varonis Systems, according to people familiar with the matter, as reported by Bloomberg and the Wall Street Journal. The potential deal is described as one of the largest “take-private” transactions in the technology sector since an earlier selloff in software stocks.

Varonis has an estimated market value of about $5 billion, and its shares rise on news that acquisition discussions are underway, the Wall Street Journal reports. Bloomberg similarly characterizes the possible transaction as a major take-private and notes that the information comes from people familiar with the talks. Channel NewsAsia does not provide additional detail in the supplied excerpt beyond referencing the discussions.

Across outlets, the emphasis is on the scale of a potential acquisition and the fact that negotiations are ongoing rather than finalized, with the only widely cited immediate market reaction being Varonis share strength following reports of the talks.