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
36funding rounds
$19.3bnpaid in the 5 acquisitions with a disclosed price
$1.2bnraised in the 28 rounds with a disclosed size
Browse other categories

Showing 1 to 50 of 70

DateDealAmountSource
3 Sept 2026Guardio raised fundingGuardio provides online protection for individuals and businesses, securing accounts and devices.Investors Assaf Rappaport, ION Crossover Partners, Union Tech Ventures, Vintage Investment Partners, Cerca Partners and 1 more$40mReport
September 2026xorlab raised a Series A roundInvestor Spicehaus Partners$5.8mReportvia Security, Funded
July 2026StrongestLayer raised a seed roundStrongestLayer provides AI email security for Microsoft 365 and Google Workspace.Investor Inovia Capital$4.1mReportvia Security, Funded
July 2026AegisAI raised a Series A roundAegisAI provides agentic email security for Microsoft 365 and Google Workspace.Investor Battery Ventures$36mReportvia Security, Funded
May 2026Ocean raised a Series A roundInvestor Lightspeed Venture Partners$20mReportvia Security, Funded
February 2026CypherShield raised a pre-seed roundInvestor LvlUp VenturesUndisclosedReport
January 2026CyberMaxx acquired Corvid CyberdefenseProvides email security servicesUndisclosedReportvia SecurityWeek
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
December 2024Sublime Security raised a Series B roundInvestor IVP$60mReportvia Security, Funded
December 2024Fortinet acquired Perception PointGuards messages, teamwork tools, browsers and online file storesUndisclosedReportvia SecurityWeek
October 2024Halon Security raised private equity fundingInvestor Intera PartnersUndisclosedReportvia Security, Funded
August 2024Abnormal Security raised a Series D roundInvestor Wellington Management$250mReportvia Security, Funded
April 2024Sublime Security raised a Series A roundInvestor Index Ventures$20mReportvia Security, Funded
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
November 2023Keystrike raised a pre-seed roundInvestors Grófin Business Development, Investco and Arcus Investment$1mReportvia Security, Funded
October 2023Proofpoint acquired TessianUndisclosedReportvia SecurityWeek
September 2023Rocket.Chat raised a Series A roundInvestors Valor Capital Group, Alexia Ventures and Endeavor Catalyst$10mReportvia Security, Funded
June 2023Mesh raised a seed roundInvestor Elkstone Capital Partners$1.7mReportvia Security, Funded
May 2023SpiderOak raised fundingInvestors Accenture Ventures, RTX Ventures and Stellar VenturesUndisclosedReportvia Security, Funded
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 2023Circle Security raised a seed roundUndisclosedReportvia Security, Funded
February 2023Sublime Security raised a seed roundInvestor Decibel Partners$9.8mReportvia Security, Funded
February 2023SmartLockr raised a Series A roundInvestor Round2 Capital PartnersUndisclosedReportvia Security, Funded
January 2023SpiderOak raised a Series C roundInvestor Madison Dearborn Partners$16.4mReportvia Security, Funded
November 2022Telios raised a seed round$45kReport
October 2022PreVeil raised a Series C roundPreVeil provides end-to-end encrypted email and file sharing for defence and regulated industries.Investor PSG$20mReport
September 2022Armorblox raised fundingInvestor S VenturesUndisclosedReportvia Security, Funded
September 2022Hornetsecurity Ltd. raised private equity fundingHornetsecurity provides Microsoft 365 security, backup, and compliance services for managed service providers.Investor TA AssociatesUndisclosedReportvia Security, Funded
August 2022Paubox raised a Series B roundPaubox provides HIPAA compliant email and security services for healthcare organisations.Investor Arthur Ventures$10mReportvia Security, Funded
June 2022Vade Secure raised fundingInvestors Tikehau Ace Capital, Bpifrance and Auriga Partners$30mReport
May 2022Material Security raised a Series C roundInvestor Andreessen Horowitz$100mReport
May 2022Abnormal Security raised a Series C roundInvestor Insight Partners$210mReport

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.