API security vendors in the United States
21 of the 28 API security vendors we list are based in the United States. 4 are public, 3 are owned by another company and 14 are private. The oldest, F5, was founded in 1996. By revenue from annual reports, the largest company here is F5 ($3.1bn in FY2025).
Companies focused on API security in the United States
4 companies| Company | Based in | Founded | Size | Ownership | Revenue |
|---|---|---|---|---|---|
 Cequence Security Cequence Security protects applications, APIs, and AI agents from attacks and abuse. | Santa Clara, United States | 2014 | Private | ||
 Data Theorem Data Theorem provides application security for mobile, API, cloud, and AI-driven applications. | Palo Alto, United States | 2013 | Private | ||
 Salt Security Salt Security provides a platform to discover and secure AI agents, MCP servers, and APIs. | Palo Alto, United States | 2018 | Private | ||
 Wallarm Wallarm provides an AI security and API security platform for enterprises running AI on AWS. | Austin, United States | Private |
Also active in API security
17 companies| Company | Based in | Founded | Size | Ownership | Revenue |
|---|---|---|---|---|---|
 F5 F5 provides application delivery and security solutions for hybrid multicloud environments. | Seattle, United States | 1996 | Public, FFIV | $3.1bn (FY2025) | |
 Cloudflare Cloudflare provides a global network for security, performance, and full-stack development. | San Francisco, United States | 2009 | 2,440 staff | Public, NET | $2.2bn (FY2025) |
 Fastly Fastly provides an edge cloud platform that helps businesses deliver, secure, and deploy applications and AI workloads. | San Francisco, United States | 2011 | Public, FSLY | $624.0m (FY2025) | |
 A10 Networks A10 Networks provides secure, high-performance networking solutions for applications and AI workloads. | San Jose, United States | 2004 | Public, ATEN | $290.6m (FY2025) | |
 Google World-renowned cybersecurity firm now part of Google Cloud, delivering threat intelligence-led penetration testing and red teaming informed by front-line incident response experience. | Mountain View, United States | 2004 | 500+ staff | Private | |
 Appdome Appdome provides a no-code platform for building security and anti-fraud defenses into mobile apps. | Redwood City, United States | Private | |||
 Arcjet Arcjet provides runtime security for AI agents, enforcing policies at the action boundary. | San Francisco, United States | 2023 | Private | ||
 Black Duck Black Duck provides application security testing tools for software development. | Burlington, Massachusetts, United States | 2002 | Owned by Clearlake Capital and Francisco Partners | ||
 Checkmarx Checkmarx provides application security testing software that scans code for vulnerabilities. | Tel Aviv, United States | 2006 | Owned by Hellman & Friedman | ||
 Darwinium Darwinium provides edge-based intent intelligence to prevent digital fraud and abuse across customer journeys. | San Francisco, United States | Private | |||
 Harness Harness provides an AI-native software delivery platform for DevOps, testing, security, and cost optimization. | San Francisco, United States | 2017 | Private | ||
 Imperva Imperva is a cybersecurity company that provides application security and data security. | San Mateo, United States | 2002 | Owned by Thales | ||
 Mend.io Mend.io provides application security and AI security software for code and AI systems. | Burlington, United States | 2011 | Private | ||
 Nowsecure NowSecure provides mobile app security and AI governance. | Chicago, United States | 2009 | Private | ||
 Akto Akto provides a platform to secure AI agents, MCPs, and LLMs for enterprises. | San Francisco, United States | Private | |||
 Contrast Security Contrast Security provides runtime application security that detects and blocks attacks from inside running applications. | Pleasanton, United States | Private | |||
 Invicti Invicti provides web application and API security testing software for enterprises. | Austin, United States | 2005 | Private |
More API security vendors
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