10 Best Penetration Testing Companies in the US (2026)

NetSPI, the Minneapolis firm founded in 2001 and backed by KKR, completed its merger with crowdsourced-testing platform Synack in October 2026, creating a combined company with more than $200 million in revenue, 350+ in-house pentesters and 1,500+ vetted Synack Red Team researchers. NetSPI offers more than 50 types of pentest — web, API, mobile and thick-client apps, internal, external and wireless networks, cloud, AI/ML and red teaming — through a pentest-as-a-service platform. NetSPI doesn’t publish prices, while Synack lists standard pentests from $10,283 plus a required platform fee; Synack’s FedRAMP Moderate authorization doesn’t extend to NetSPI products. Best for: enterprises, banks and government contractors that want in-house experts and a large researcher community from one provider.

Coalfire, the Chicago-based cybersecurity firm owned by funds advised by Apax Partners since 2020, calls itself the leading provider of FedRAMP compliance assessments and penetration testing in the US. In August 2025 it launched DivisionHex, an offensive and defensive security division whose testing covers red teaming, social engineering, applications and networks, physical security, hardware, mobile and AI/LLM systems. Pricing is by quote. Best for: SaaS and cloud companies that need pentests tied to FedRAMP, PCI or other compliance programs.

TrustedSec, the Fairlawn, Ohio consultancy founded by David Kennedy, offers penetration testing, red and purple teaming, social engineering, cloud and IoT/hardware testing, LLM assessments and Active Directory and Microsoft 365 security reviews, along with PCI, HIPAA and CMMC assessments. In 2025 Trimarc Security, Sean Metcalf’s Active Directory specialist, began operating under the TrustedSec banner, and in October 2026 TrustedSec joined OpenAI’s Daybreak Defense Network. Engagements are consultant-led and priced by quote. Best for: companies that want hands-on red and purple teaming and deep Microsoft identity expertise.

Cobalt, the Boston-based pentest-as-a-service company founded in 2013, matches customers with Cobalt Core, a community of more than 500 vetted pentesters, to test web apps, APIs, mobile apps, networks, cloud and AI/LLM systems, with reports mapped to PCI DSS, HIPAA, SOC 2, ISO 27001 and NIST. It sells testing in credits, each worth eight hours of testing, but doesn’t publish the price of a credit. In July 2026 it launched Cobalt Autonomous Pentest, which delivers findings within 24 hours. Best for: SaaS and app teams that need recurring pentests for compliance.

Praetorian, the Austin, Texas firm led by founder and CEO Nathan Sportsman, pairs consultant-led testing of web, mobile, API, network, cloud, CI/CD, hardware, IoT, automotive and AI/LLM systems, plus red, purple and assumed-breach exercises, with Praetorian Guard, a managed service that combines attack surface management, vulnerability management, breach and attack simulation and continuous pentesting. In June 2026 it added Hannibal, which runs long-running autonomous offensive operations inside Guard. Pricing is by quote. Best for: large enterprises and hardware or IoT product companies that want continuous, managed offensive testing.

Horizon3.ai, the San Francisco company behind NodeZero, sells autonomous pentesting software that runs without humans in the loop against internal and external networks, AWS and Azure cloud, Kubernetes and, since July 2026, web apps and APIs. It publishes prices per asset — $15 per asset per test on Flex, or $50 to $85 per asset a year with unlimited tests — though every device or service NodeZero discovers counts as an asset, and PCI DSS pentests are a separate service run by OSCP-certified staff. It raised $250 million at a valuation above $2 billion in August 2026 and passed $100 million in annual recurring revenue in October 2026. Best for: IT teams and MSPs that want to test their networks often at a predictable price.

HackerOne, the San Francisco company best known for bug bounty programs, sells two kinds of pentests: H1 Agentic Pentest, in which AI agents and human pentesters test web apps and APIs, and the human-led H1 Pentest for networks, mobile, cloud, desktop apps, AI/LLM systems and PCI segmentation, with reports for SOC 2, ISO 27001 and other frameworks. It launched agentic pentest-as-a-service in January 2026 and joined Anthropic’s Project Glasswing in July 2026. Pricing is by quote. In 2022 an employee was fired for improperly accessing customer vulnerability reports to claim bounties. Best for: companies that already run a HackerOne bug bounty or vulnerability disclosure program.

Black Hills Information Security, the Sturgis, South Dakota firm owned by its founder John Strand, tests applications, networks and cloud environments, offers manual web application and API testing, AI security assessments and blockchain security reviews, and runs ANTISOC, a continuous pentesting service in which operators emulate newly disclosed attacks and report findings in real time, with quarterly debriefs. Pricing is by quote. Best for: small and midsize companies that want an owner-led firm offering both one-time and continuous testing.

Raxis, founded in 2011 by Mark Puckett and based in Atlanta with a fully remote US team, covers one of the widest ranges of tests here: networks, Active Directory, cloud, wireless, IoT, operational technology, web, API, mobile, Salesforce and AI/LLM systems, plus phishing, physical on-site testing and red and purple teaming. It sells point-in-time tests as Raxis Strike and continuous pentest-as-a-service as Raxis Attack, added AI-augmented tools to its pentests in September 2025, and prices by quote. Best for: companies that need physical, OT or Salesforce testing alongside standard pentests.