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.

10acquisitions
6funding rounds
$150mpaid in the 1 acquisition with a disclosed price
$323.2mraised in the 6 rounds with a disclosed size
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Showing 1 to 16 of 16

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
September 2025Varonis acquired SlashNextProvides email security using predictive AI against spearphishing and social engineering$150mReportvia SecurityWeek
September 2025Halon acquired ElevenGerman provider of email threat intelligence for mailbox providers and ISPsUndisclosedReportvia SecurityWeek
August 2025ImageSource acquired Zorse CyberEmail, web and file threat detection and prevention technologyUndisclosedReportvia SecurityWeek
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
June 2025Kiteworks acquired ZivverDutch email security firm providing secure email capabilitiesUndisclosedReportvia SecurityWeek
June 2025Bregal Milestone acquired TitanHQProvides email and web security, security awareness and email archivingUndisclosedReportvia SecurityWeek
June 2025Bitdefender acquired Mesh SecurityIrish provider of email security solutions and technologyUndisclosedReportvia SecurityWeek
May 2025Vipre Security acquired Forensic and Compliance SystemsProvides email archiving for compliance, eDiscovery and business continuityUndisclosedReportvia SecurityWeek
May 2025Proofpoint acquired Hornetsecurity Ltd.Hornetsecurity provides Microsoft 365 security, backup, and compliance services for managed service providers.UndisclosedReportvia SecurityWeek
April 2025Hornetsecurity Ltd. acquired AltospamFrench company providing email security solutionsUndisclosedReportvia SecurityWeek
February 2025Data443 acquired Breezemail.aiMachine learning tools that guard email privacy in Office and GmailUndisclosedReportvia SecurityWeek

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.