# Top 50 Cybersecurity Startups Founded in 2021 by Funding (2026)

> The 50 best-funded cybersecurity startups founded in 2021, ranked by total funding raised: $3.3B combined.

Source: https://millionrounds.com/top-lists/cybersecurity-startups-founded-2021 (Millionrounds; every figure on the page links to its filing or article)

- 1 [**Chainguard** Chainguard is a cybersecurity company founded in 2021, focused on software supply chain security.](https://millionrounds.com/company/chainguard) Chainguard is a cybersecurity company founded in 2021, focused on software supply chain security. *Founded* 2021 Kirkland, United States **$776M** last round Oct 2025
- 2 [**Quantinuum** Quantinuum accelerates quantum computing and the development of applications across chemistry, cybersecurity, finance, and optimization.](https://millionrounds.com/company/quantinuum) Quantinuum accelerates quantum computing and the development of applications across chemistry, cybersecurity, finance, and optimization. *Founded* 2021 Broomfield, United States **$700M** last round Sept 2026
- 3 [**Fidium** Fidium was developed to defy consumer expectations of network and internet service providers.](https://millionrounds.com/company/fidium) Fidium was developed to defy consumer expectations of network and internet service providers. *Founded* 2021 Mattoon, United States **$665M** last round Mar 2026
- 4 [**Enigma** We are an open platform with blockchain-based technology and simple tools for artists and creators to grow alongside fans, investors and the entertainment indus](https://millionrounds.com/company/enigma) We are an open platform with blockchain-based technology and simple tools for artists and creators to grow alongside fans, investors and the entertainment indus *Founded* 2021 Saint Petersburg, United States **$166M** last round Jul 2026
- 5 [**Defense Unicorns** Defense Unicorns is a veteran-owned defense technology company founded in 2021, with roots tracing back to late 2020.](https://millionrounds.com/company/defense-unicorns) Defense Unicorns is a veteran-owned defense technology company founded in 2021, with roots tracing back to late 2020. *Founded* 2021 Colorado Springs, United States **$136M** last round Jan 2026
- 6 [**Talon Cyber Security** Talon Cyber Security provides cybersecurity solutions for the distributed workforce.](https://millionrounds.com/company/talon-cyber-security) Talon Cyber Security provides cybersecurity solutions for the distributed workforce. *Founded* 2021 Tel Aviv **$100M** last round Aug 2022
- 7 [**Endor Labs** Endor Labs is a cybersecurity company focused on Agentic Application Security and Software Supply Chain Security.](https://millionrounds.com/company/endor-labs) Endor Labs is a cybersecurity company focused on Agentic Application Security and Software Supply Chain Security. *Founded* 2021 Palo Alto, United States **$93M** last round Apr 2025
- 8 [**Reach Security** Reach Security is an AI-native cybersecurity company founded in 2021, focused on helping organizations identify and address hidden risks that traditional securi](https://millionrounds.com/company/reach-security) Reach Security is an AI-native cybersecurity company founded in 2021, focused on helping organizations identify and address hidden risks that traditional securi *Founded* 2021 San Francisco, United States **$60M** last round Oct 2026
- 9 [**Ox Security** Ox Security is the first end-to-end security solution to prevent attacks across your software.](https://millionrounds.com/company/ox-security) Ox Security is the first end-to-end security solution to prevent attacks across your software. *Founded* 2021 Tel Aviv, United States **$60M** last round May 2025
- 10 [**Dazz** Dazz delivers unified security remediation across code, clouds, infrastructure, and applications for security and development teams.](https://millionrounds.com/company/dazz) Dazz delivers unified security remediation across code, clouds, infrastructure, and applications for security and development teams. *Founded* 2021 Palo Alto, United States **$50M** last round Jul 2024
- 11 [**SecureKey** SecureKey Electronic appliances manufacturing company.](https://millionrounds.com/company/securekey) SecureKey Electronic appliances manufacturing company. *Founded* 2021 Canada **$47M** last round Oct 2016
- 12 [**Apono** Apono helps companies become secure and compliant while maintaining their productivity and agility.](https://millionrounds.com/company/apono) Apono helps companies become secure and compliant while maintaining their productivity and agility. *Founded* 2021 New York, United States **$34M** last round Nov 2025
- 13 [**RADICL Defense** We secure small and medium sized businesses from nation state level cyberthreats.](https://millionrounds.com/company/radicl-defense) We secure small and medium sized businesses from nation state level cyberthreats. *Founded* 2021 United States **$31M** last round Feb 2026
- 14 [**Push Security** Push Security is a cybersecurity company focused on browser-based identity threat detection and response (ITDR).](https://millionrounds.com/company/push-security) Push Security is a cybersecurity company focused on browser-based identity threat detection and response (ITDR). *Founded* 2021 Peabody, United States **$30M** last round Apr 2025
- 15 [**Hypori** Hypori is an enterprise software company based in Reston, Virginia, with a technology hub in Austin, Texas.](https://millionrounds.com/company/hypori) Hypori is an enterprise software company based in Reston, Virginia, with a technology hub in Austin, Texas. *Founded* 2021 Reston, United States **$26M** last round Jan 2025
- 16 [**Truffle Security** Truffle Security is an open source cybersecurity company that offers solutions for finding and remediating leaked software credentials.](https://millionrounds.com/company/truffle-security) Truffle Security is an open source cybersecurity company that offers solutions for finding and remediating leaked software credentials. *Founded* 2021 San Francisco, United States **$25M** last round Nov 2025
- 17 [**Aembit** Aembit is a cybersecurity company founded in 2021 and headquartered in Silver Spring, Maryland.](https://millionrounds.com/company/aembit) Aembit is a cybersecurity company founded in 2021 and headquartered in Silver Spring, Maryland. *Founded* 2021 Silver Spring, United States **$25M** last round Jul 2024
- 18 [**Valence Security** Valence Security is a cybersecurity company founded in 2021 and based in Tel Aviv, Israel, with additional operations in South San Francisco and New York.](https://millionrounds.com/company/valence-security) Valence Security is a cybersecurity company founded in 2021 and based in Tel Aviv, Israel, with additional operations in South San Francisco and New York. *Founded* 2021 New York, United States **$25M** last round Oct 2022
- 19 [**Niobium** Niobium is a private computer hardware and semiconductors company located in Dayton, Ohio, founded in 2021.](https://millionrounds.com/company/niobium) Niobium is a private computer hardware and semiconductors company located in Dayton, Ohio, founded in 2021. *Founded* 2021 Dayton, United States **$23M** last round Dec 2025
- 20 [**Conveyor** Conveyor is a software company based in San Francisco, founded in 2021.](https://millionrounds.com/company/conveyor) Conveyor is a software company based in San Francisco, founded in 2021. *Founded* 2021 San Francisco, United States **$20M** last round Jun 2025
- 21 [**watchTowr** watchTowr is a global cybersecurity technology company founded in 2021 and headquartered in Singapore, with additional offices in New York and London.](https://millionrounds.com/company/watchtowr) watchTowr is a global cybersecurity technology company founded in 2021 and headquartered in Singapore, with additional offices in New York and London. *Founded* 2021 Singapore, United Kingdom **$19M** last round Oct 2024
- 22 [**Sitehop** Sitehop develops cutting-edge networking and cyber-security solutions.](https://millionrounds.com/company/sitehop) Sitehop develops cutting-edge networking and cyber-security solutions. *Founded* 2021 Sheffield, United Kingdom **$18M** last round Oct 2025
- 23 [**Trustmi** Trustmi is a SaaS behavioral AI platform focused on eliminating B2B payment fraud and costly errors.](https://millionrounds.com/company/trustmi) Trustmi is a SaaS behavioral AI platform focused on eliminating B2B payment fraud and costly errors. *Founded* 2021 New York, United States **$17M** last round Jul 2023
- 24 [**dope.security** dope.security is an American enterprise cybersecurity company founded in 2021 and headquartered in Mountain View, California, with operations in Cork, Ireland.](https://millionrounds.com/company/dope-security) dope.security is an American enterprise cybersecurity company founded in 2021 and headquartered in Mountain View, California, with operations in Cork, Ireland. *Founded* 2021 Mountain View, United States **$16M** last round Mar 2023
- 25 [**Radiant Security** Radiant Security is an autonomous MDR that automates security operations using machine learning and AI.](https://millionrounds.com/company/radiant-security) Radiant Security is an autonomous MDR that automates security operations using machine learning and AI. *Founded* 2021 San Francisco, United States **$15M** last round Nov 2023
- 26 [**Saibo Kunlun** Saibo Kunlun is a cyber security service provider that focuses on software, system security, and cloud security.](https://millionrounds.com/company/saibo-kunlun) Saibo Kunlun is a cyber security service provider that focuses on software, system security, and cloud security. *Founded* 2021 Beijing **$14M** last round Jul 2023
- 27 [**Baobab** Baobab Risk Solutions (BRS) is a prominent European provider of digital risk protection, based in Berlin, Germany.](https://millionrounds.com/company/baobab) Baobab Risk Solutions (BRS) is a prominent European provider of digital risk protection, based in Berlin, Germany. *Founded* 2021 Berlin, Germany **$14M** last round Jun 2025
- 28 [**Dattak** Dattak is a Paris-based insurtech company founded in 2021 that specializes in technology risk management.](https://millionrounds.com/company/dattak) Dattak is a Paris-based insurtech company founded in 2021 that specializes in technology risk management. *Founded* 2021 Paris, France **$12M** last round Aug 2023
- 29 [**Impart Security** Impart Security is a complete API security platform designed to enable security and development teams to protect their APIs.](https://millionrounds.com/company/impart-security) Impart Security is a complete API security platform designed to enable security and development teams to protect their APIs. *Founded* 2021 San Francisco, United States **$12M** last round Jun 2025
- 30 [**WISeSAT.SPACE** WISeSat.Space is a satellite-technology company specializing in secure space-based IoT connectivity and trusted communications.](https://millionrounds.com/company/wisesat-space) WISeSat.Space is a satellite-technology company specializing in secure space-based IoT connectivity and trusted communications. *Founded* 2021 Meyrin, Switzerland **$10M** last round Jun 2025
- 31 [**MirrorTab** MirrorTab is a cybersecurity company based in San Francisco, founded in 2021.](https://millionrounds.com/company/mirrortab) MirrorTab is a cybersecurity company based in San Francisco, founded in 2021. *Founded* 2021 San Francisco, United States **$8.5M** last round Feb 2025
- 32 [**Saporo** Saporo is a Swiss cybersecurity company founded in 2021 and based in Lausanne.](https://millionrounds.com/company/saporo) Saporo is a Swiss cybersecurity company founded in 2021 and based in Lausanne. *Founded* 2021 Lausanne, Switzerland **$8.1M** last round Nov 2025
- 33 [**Tromzo** Tromzo is a developer-first Application Security Posture Management (ASPM) platform that enhances the remediation of security risks from code to cloud.](https://millionrounds.com/company/tromzo) Tromzo is a developer-first Application Security Posture Management (ASPM) platform that enhances the remediation of security risks from code to cloud. *Founded* 2021 Mountain View, United States **$8.0M** last round Aug 2023
- 34 [**Darwinium** Darwinium is an AI-powered digital security and fraud prevention company based in San Francisco, with additional offices in Sydney and London.](https://millionrounds.com/company/darwinium) Darwinium is an AI-powered digital security and fraud prevention company based in San Francisco, with additional offices in Sydney and London. *Founded* 2021 San Francisco, United States **$7.0M** last round Feb 2026
- 35 [**Ecole 2600** Ecole 2600 is a French cybersecurity school located in Montigny-le-Bretonneux, dedicated to training experts in digital system protection.](https://millionrounds.com/company/ecole-2600) Ecole 2600 is a French cybersecurity school located in Montigny-le-Bretonneux, dedicated to training experts in digital system protection. *Founded* 2021 Montigny-le-Bretonneux, France **$6.5M** last round Apr 2023
- 36 [**CYB3R OPERATIONS** CYB3R Operations is a London-based cybersecurity startup founded in 2021.](https://millionrounds.com/company/cyb3r-operations) CYB3R Operations is a London-based cybersecurity startup founded in 2021. *Founded* 2021 London, United Kingdom **$6.0M** last round Jan 2026
- 37 [**Crosswire** Crosswire is a New York-based company specializing in enterprise security and identity management.](https://millionrounds.com/company/crosswire) Crosswire is a New York-based company specializing in enterprise security and identity management. *Founded* 2021 New York, United States **$6.0M** last round Dec 2021
- 38 [**Phin Security** Phin provides social engineering simulation across all communication channels and delivers training to employees.](https://millionrounds.com/company/phin-security) Phin provides social engineering simulation across all communication channels and delivers training to employees. *Founded* 2021 United States **$6.0M** last round Apr 2026
- 39 [**Moxso** Moxso is an AI-driven cybersecurity training company based in Copenhagen, Denmark, founded in 2021.](https://millionrounds.com/company/moxso) Moxso is an AI-driven cybersecurity training company based in Copenhagen, Denmark, founded in 2021. *Founded* 2021 Kobenhavn, Denmark **$5.5M** last round Aug 2025
- 40 [**Fleak** Fleak is a software development company based in San Jose, California, founded in 2024.](https://millionrounds.com/company/fleak) Fleak is a software development company based in San Jose, California, founded in 2024. *Founded* 2021 San Jose, United States **$5.0M** last round Oct 2024
- 41 [**RiPSIM Technologies** RiPSIM Technologies is a U.S.-based software company specializing in eSIM-as-a-service and comprehensive eSIM lifecycle management.](https://millionrounds.com/company/ripsim-technologies) RiPSIM Technologies is a U.S.-based software company specializing in eSIM-as-a-service and comprehensive eSIM lifecycle management. *Founded* 2021 Ashburn, United States **$5.0M** last round Oct 2025
- 42 [**Patchstack** Patchstack is an Estonian cybersecurity startup focused on open-source security intelligence, particularly within the WordPress ecosystem.](https://millionrounds.com/company/patchstack) Patchstack is an Estonian cybersecurity startup focused on open-source security intelligence, particularly within the WordPress ecosystem. *Founded* 2021 Paernu, United Kingdom **$5.0M** last round Sept 2024
- 43 [**Xygeni** Xygeni is a platform focused on Application Security Posture Management (ASPM) and Software Supply Chain Security, designed to secure the entire software develo](https://millionrounds.com/company/xygeni) Xygeni is a platform focused on Application Security Posture Management (ASPM) and Software Supply Chain Security, designed to secure the entire software develo *Founded* 2021 Majadahonda, Spain **$4.4M** last round Jun 2023
- 44 [**Handwave** Handwave is a Latvian deeptech fintech startup based in Riga, founded in 2021 or 2022.](https://millionrounds.com/company/handwave) Handwave is a Latvian deeptech fintech startup based in Riga, founded in 2021 or 2022. *Founded* 2021 Latvia **$4.2M** last round Aug 2025
- 45 [**Verosint** Real-time Account Fraud Detection & Prevention Platform](https://millionrounds.com/company/verosint) Real-time Account Fraud Detection & Prevention Platform *Founded* 2021 Austin, United States **$4.0M** last round Oct 2023
- 46 [**Xentra** Xentra is a UK-based digital security company that specializes in subscription-led cyber security, compliance, and managed IT security services.](https://millionrounds.com/company/xentra) Xentra is a UK-based digital security company that specializes in subscription-led cyber security, compliance, and managed IT security services. *Founded* 2021 Leeds, United Kingdom **$3.6M** last round Jul 2026
- 47 [**Aceiss** The risk of unauthorized access is a real and growing threat for everyone.](https://millionrounds.com/company/aceiss) The risk of unauthorized access is a real and growing threat for everyone. *Founded* 2021 New Canaan, United States **$3.3M** last round Aug 2022
- 48 [**PingSafe** PingSafe is a cloud security platform that provides protection against vulnerabilities that traditional security solutions may miss.](https://millionrounds.com/company/pingsafe) PingSafe is a cloud security platform that provides protection against vulnerabilities that traditional security solutions may miss. *Founded* 2021 San Francisco, United States **$3.3M** last round Jul 2023
- 49 [**Enveedo** Enveedo is a Cyber Risk Management Platform founded in 2021 and based in Miami, Florida.](https://millionrounds.com/company/enveedo) Enveedo is a Cyber Risk Management Platform founded in 2021 and based in Miami, Florida. *Founded* 2021 Miami, United States **$3.1M** last round Mar 2024
- 50 [**Common Fate** Common Fate is an identity security and cloud access management company focused on protecting sensitive digital assets.](https://millionrounds.com/company/common-fate) Common Fate is an identity security and cloud access management company focused on protecting sensitive digital assets. *Founded* 2021 Perth, Australia **$3.1M** last round Dec 2022

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies founded in 2021 whose funding rounds we classed in this sector, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

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