Top 21 Vulnerability Testing startups

Updated: Nov 07, 2025
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These startups develop software for penetration testing, identifying system weaknesses, assessing security risks and managing vulnerabilities.
1
Tenable.io
Country: USA | Funding: $565.4M
Tenable helps organizations to understand and reduce their cybersecurity risk across the full range of modern computing assets.
2
NetSPI
Country: USA | Funding: $500M
NetSPI is a cybersecurity company that offers enterprise security testing and attack surface management services.
3
Rapid7
Country: USA | Funding: $350.5M
Rapid7 is a cybersecurity company that helps organizations detect and respond to security threats effectively.
4
Pentera
Country: USA | Funding: $249.5M
Pentera is the market leader in Automated Security Validation
5
Bugcrowd
Country: USA | Funding: $230.7M
Bugcrowd harnesses the power of a global community of security researchers to surface critical software vulnerabilities.
6
Horizon3
Country: USA | Funding: $178.5M
Horizon3.ai develops NodeZero which provides an autonomous penetration testing solution that helps customers find and fix attack vectors.
7
HackerOne
Country: USA | Funding: $159.4M
HackerOne is a powered security platform that connects businesses with penetration testers and cybersecurity researchers.
8
Horizon3.ai
Country: USA | Funding: $151.5M
Horizon3.ai offers an autonomous penetration testing platform that helps organizations proactively find and fix security vulnerabilities.
9
Filigran
Country: France | Funding: €102M
Filigran is a cybersecurity company that develops an open-source threat intelligence management platform.
10
Synack
Country: USA | Funding: $107.6M
Synack is a crowdsourced security platform that utilizes augmented intelligence to discover and secure vulnerable applications.
11
Vicarius
Country: USA | Funding: $59.2M
Vicarius develops an autonomous vulnerability remediation platform to protect organizations from the next major supply-chain attack.
12
Detectify
Country: Sweden | Funding: $42M
Detectify sets the standard for External Attack Surface Management (EASM), providing 99.7% accurate vulnerability assessments.
13
Cobalt.io
Country: USA | Funding: $37M
Cobalt is a PTaaS platform that transforms traditional pentesting into a data-driven vulnerability management engine.
14
Qualys
Country: USA | Funding: $34M
Qualys is the pioneer and leading provider of information security and compliance cloud solutions.
15
Intigriti
Country: Belgium | Funding: €25.3M
Intigriti enables clients to launch managed security testing at scale and accurately assess risk to prioritize remediation.
16
Edgescan
Country: Ireland | Funding: $13.6M
One platform. Five full-featued Solutions | Hybrid solution providing automated vulnerability intelligence with validation done by humans.
17
OnSecurity
Country: UK | Funding: £5.5M
Onsecurity is an offensive security company that offers pentesting, vulnerability scanning and threat intelligence, all on one platform.
18
BreachLock
Country: USA | Funding: $3.1M
Pen Testing as A Service (PTaaS) | World's first full stack PTaaS powered by Certified Hackers and AI
19
Intruder.io
Country: UK | Funding: £915K
Intruder is a cloud-based vulnerability scanner that finds cyber security weaknesses in your external infrastructure.
20
Pentest People
Country: UK
Pentest People are a boutique security consultancy focussing on bringing the benefits of Pentesting as a Service (PTaaS) to all its clients.
Fernando Lopez
Editor: Fernando Lopez
Fernando Lopez is a senior editor for SaaStartups. He joined the company after having previously spent over three years at ReadWriteWeb. Prior to his work as a reporter, Fernando worked in I.T. across a number of industries, including banking, retail and software. Fernando graduated from the University of Buenos Aires (Computer Science). He is more-than-averagely interested in photography and can often be found with a camera slung over his shoulder. He wrote a book about pitching startups to investors. You can contact Fernando at fernandolopez(at)saastartups(dot)com