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.

34acquisitions
$19.3bnpaid in the 5 acquisitions with a disclosed price
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Showing 1 to 34 of 34

DateDealAmountSource
January 2026CyberMaxx acquired Corvid CyberdefenseProvides email security servicesUndisclosedReportvia SecurityWeek
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
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
December 2024Fortinet acquired Perception PointGuards messages, teamwork tools, browsers and online file storesUndisclosedReportvia SecurityWeek
April 2024KnowBe4 acquired Egress Software Technologies LtdEgress provides cloud email security that uses adaptive controls to stop phishing and data loss.UndisclosedReportvia SecurityWeek
March 2024Hornetsecurity Ltd. acquired VadeFrench company specialising in email securityUndisclosedReportvia SecurityWeek
February 2024Notion acquired SkiffEncrypted email and productivity startupUndisclosedReportvia SecurityWeek
October 2023Proofpoint acquired TessianUndisclosedReportvia SecurityWeek
May 2023Data443 acquired CyrenFirm guarding online communications, spotting dangers and sorting web addressesUndisclosedReportvia SecurityWeek
May 2023Cisco acquired ArmorbloxEmail security firm using predictive and generative artificial intelligence technologyUndisclosedReportvia SecurityWeek
April 2022Proton acquired SimpleLoginOpen source anonymous email service that hides users' real addressesUndisclosedReportvia SecurityWeek
April 2022KKR acquired Barracuda NetworksBarracuda Networks provides cybersecurity solutions for email, networks, applications, and data.UndisclosedReportvia SecurityWeek
February 2022Cloudflare acquired Area 1Email security company providing email protection technology$162mReportvia SecurityWeek
January 2022Kiteworks acquired totemoScrambles email, moves files safely and keeps mobile conversations privateUndisclosedReportvia SecurityWeek
December 2021Permira acquired MimecastMimecast provides email security and human risk management services for organisations.$5.8bnReportvia SecurityWeek
November 2021Open Text Corporation acquired ZixEmail security company$860mReportvia SecurityWeek
August 2021Check Point acquired AvananProvides cloud email security solutionsUndisclosedReportvia SecurityWeek
June 2021Egress Software Technologies Ltd acquired AquilaiUK firm providing email security solutions with anti-phishing technologyUndisclosedReportvia SecurityWeek
May 2021HelpSystems acquired AgariEmail security companyUndisclosedReportvia SecurityWeek
April 2021Thoma Bravo acquired ProofpointProofpoint provides cybersecurity solutions to protect people, data, and AI across email, cloud, and collaboration tools.$12.3bnReportvia SecurityWeek
April 2021Cofense acquired CyberfishEmploys machine learning to stop fake messages and dodgy sitesUndisclosedReportvia SecurityWeek
March 2021Hornetsecurity Ltd. acquired ZerospamGuards email for smaller companies using cloud based toolsUndisclosedReportvia SecurityWeek
March 2021Datto acquired BitDamProvides threat detection and protection for email and collaboration toolsUndisclosedReportvia SecurityWeek
February 2021Westcoast acquired Beyond EncryptionProvides email and communication security productsUndisclosedReportvia SecurityWeek
July 2020Arrow Business Communications acquired AltinetKeeps messages and hosted systems safe for organisationsUndisclosedReportvia Cybersecurity Ventures
February 2020SafeSwiss Secure Communication acquired Secure Swiss DataBuilds encrypted messaging, storage and sharing tools for everyday usersUndisclosedReportvia Cybersecurity Ventures

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.