cybersecdirectory

Email security acquisitions and funding

34 acquisitions of email security vendors since 2020 and 36 funding rounds since 2022 on record. The most active buyers are Hornetsecurity Ltd. (3), Kiteworks (2) and Proofpoint (2). See the email security vendors in the directory.

6funding rounds
$323.2mraised in the 6 rounds with a disclosed size
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Showing 1 to 6 of 6

DateDealAmountSource
November 2025Guardio raised a Series B roundGuardio provides online protection for individuals and businesses, securing accounts and devices.Investor ION Crossover Partners$80mReportvia Security, Funded
October 2025Sublime Security raised a Series C roundInvestor Georgian$150mReportvia Security, Funded
September 2025AegisAI raised a seed roundAegisAI provides agentic email security for Microsoft 365 and Google Workspace.Investors Accel and Foundation Capital$13mReportvia Security, Funded
July 2025StrongestLayer raised a seed roundStrongestLayer provides AI email security for Microsoft 365 and Google Workspace.Investor Sorenson Capital$5.2mReportvia Security, Funded
July 2025Virtru raised a Series D roundVirtru provides encryption and access control for email, files, and SaaS applications.Investor ICONIQ Capital$50mReportvia Security, Funded
June 2025Trustifi raised a Series A roundInvestor Camber Partners$25mReportvia Security, Funded

Acquisitions come from SecurityWeek's monthly M&A round-ups from 2021 onwards, from Cybersecurity Ventures' quarterly M&A reports for 2020, and a few from Wikipedia lists. Funding rounds from 2022 onwards come from Return on Security's weekly Security, Funded newsletter. These are dated to the month. A few deals added from the news are dated to the day. Smaller deals may be missing. Each Report link goes to the announcement or story the source cites, and the via link to the round-up or newsletter issue. Amounts are in US dollars. The category is what the bought or funded company sells.