Penetration testing companies are not interchangeable. A pentest bought to satisfy a SOC 2 auditor, a PCI DSS assessor or a bank’s vendor questionnaire needs different evidence than a deep application test before a product launch, and the quality of the tester matters far more than the brand on the report. This list covers firms that sell hands-on penetration testing services across networks, applications, cloud and physical security. It leaves out pure scanning tools and bug bounty platforms that do not deliver tester led engagements.
To build the list, we reviewed each firm’s own website for a real pentest service page, the scope of testing it offers, and verifiable credentials such as CREST accreditation, PCI QSA status, FedRAMP 3PAO recognition or tester certifications like OSCP. We also checked headquarters, founding dates and leadership where the firm publishes them and left out claims we could not confirm. Rankings reflect that review, not payment.
Top Penetration Testing Companies In 2026
| Company | Best For | Headquarters | Core Services |
|---|---|---|---|
| NetSPI | Enterprises that want continuous PTaaS coverage | Minneapolis, Minnesota, USA | PTaaS, application, cloud, network, mainframe and AI/ML testing, red team |
| Pen Test Partners | Regulated UK and US organizations, IoT and transport | Buckingham, UK (US office in New York) | Infrastructure, application, IoT, OT and maritime testing, red teaming |
| TrustedSec | Teams that want deeply technical testing and program building | Fairlawn, Ohio, USA | Penetration testing, application security testing, red team, incident response |
| Packetlabs | Mid-market and enterprise buyers who want manual, in-house testing | Toronto, Ontario, Canada | Manual penetration testing, adversary simulation, application and cloud testing |
| A-LIGN | Companies bundling pentests with SOC 2, PCI or FedRAMP audits | Tampa, Florida, USA | Penetration testing, PCI DSS, SOC 2, ISO 27001, FedRAMP, CMMC |
| Schellman | Cloud providers and federal suppliers needing assessor grade testing | Tampa, Florida, USA | Penetration testing, FedRAMP, SOC, PCI, ISO and AI governance assessments |
| Bishop Fox | Large tech companies that need continuous offensive testing | United States | Continuous testing, penetration testing, red team, application security |
| VerSprite | Product teams that want threat modeled pentests | Atlanta, Georgia, USA | Threat modeling, penetration testing, managed security services |
| Software Secured | SaaS startups preparing for SOC 2 and enterprise deals | Canada | Manual web, API and cloud pentesting, PTaaS, compliance mapping |
| Triaxiom Security | Small and mid-sized firms needing CREST accredited testing | Charlotte, North Carolina, USA | Penetration testing, security audits, PCI compliance assessments |
1. NetSPI
NetSPI was founded in 2001 and is headquartered in Minneapolis, Minnesota, with additional offices in Portland, Kansas City, Toronto, London and India. The company describes itself as the pioneer of Penetration Testing as a Service, or PTaaS, and reports more than 350 security experts.
NetSPI fits large organizations that test continuously rather than once a year. Its testing catalog covers applications, cloud, networks, hardware, AI and ML systems and mainframes, alongside attack surface management, detective controls testing, social engineering and red team operations. The firm says its customers include top US banks, leading cloud providers and large healthcare companies, which makes it a common pick for security teams that need a single program spanning hundreds of assets with findings delivered through a platform instead of static PDF reports.
Services and expertise: penetration testing as a service, web, mobile and API testing, cloud and network pentesting, mainframe and hardware testing, AI and ML security testing, red team operations, attack surface management.
2. Pen Test Partners
Pen Test Partners has brought security testing expertise to a wide range of industries since 2010. The firm is based in Buckingham, England, and runs a US entity, Pen Test Partners Inc, from offices on Broadway in New York.
Its credentials are among the strongest on this list. Pen Test Partners describes itself as one of the founding members of the CREST scheme and a former CVE Board member, and it says it has helped shape frameworks such as CBEST, the Bank of England’s intelligence led testing scheme. Beyond standard infrastructure and application work, the team is well known for research into connected devices, vehicles, aviation and maritime systems, which makes it a strong fit when the scope reaches beyond IT into operational technology.
Services and expertise: network and infrastructure pentesting, web and mobile application testing, IoT and hardware security, OT and industrial systems, red teaming and CBEST style intelligence led testing, security research.
3. TrustedSec
TrustedSec is headquartered in Fairlawn, Ohio. Founder David Kennedy set out to assemble a highly technical team of consultants and advisors, and the firm has grown into an end to end cybersecurity provider that pairs offensive testing with incident response and security program development.
Its penetration testing service is built to gauge performance and improve team readiness rather than produce a checklist report. For application security testing, TrustedSec says it can analyze any type of web application regardless of the language it is written in, and its wider offering includes capability development programs, so clients can turn test findings into long term improvements. TrustedSec suits organizations that want testers who also advise on detection and response maturity.
Services and expertise: external, internal and wireless penetration testing, web application security testing, physical and social engineering assessments, red teaming, incident response, security program development.
4. Packetlabs
Packetlabs is headquartered at 401 Bay Street in Toronto, with outposts in San Francisco and Australia. The firm is CREST accredited and SOC 2 Type II attested, two signals that matter when a pentest vendor will handle sensitive data and production access.
Packetlabs is explicit about how it staffs work: OSCP is the minimum certification for its testers, testing is described as 100 percent manual driven, and the firm says it outsources none of its engagements. It positions itself against automated vulnerability scans that are sold as pentests, promising impact first findings with no false positives. That combination appeals to buyers who have been burned by scanner output dressed up as a report.
Services and expertise: manual network and infrastructure pentesting, web and mobile application testing, cloud penetration testing, adversary simulation, social engineering, ransomware readiness assessments.
5. A-LIGN
A-LIGN is a cybersecurity and compliance firm with offices in Tampa, Florida, as well as London, Panama City, Sofia, Gurugram and Galway. It holds an unusually broad set of accreditations, including PCI QSA company status, FedRAMP 3PAO and CMMC C3PAO recognition, and HITRUST CSF assessor status.
Its penetration testing practice is staffed by OSCP, OSCE and OSEE certified testers, and A-LIGN reports more than 4,600 completed engagements. The main advantage is alignment with audit frameworks: pentest results map across SOC 2, ISO 27001, FedRAMP, CMMC, ISO 42001, PCI and HITRUST, so findings feed straight into the compliance evidence an auditor will request. It is a practical choice for SaaS and services firms that want one vendor for testing and attestation.
Services and expertise: network, application and cloud penetration testing, PCI DSS assessments, SOC 1 and SOC 2 audits, ISO 27001 and ISO 42001 certification, FedRAMP and CMMC assessments, HITRUST.
6. Schellman
Schellman began as a SOC audit firm more than 20 years ago and is headquartered in Tampa, Florida. It describes itself as the only Top 50 CPA firm focused exclusively on IT compliance and cybersecurity and as the leading provider of FedRAMP assessments, and it was the first ISO 42001 ANAB accredited certification body. CEO Avani Desai was named to the 2026 class of Henry Crown Fellows by the Aspen Institute.
Schellman’s pentest team covers application, network, mobile, social engineering, cloud, physical, and hardware and IoT testing, plus advanced services such as red teaming, purple teaming, Active Directory assessments and AI red teaming. Every tester undergoes a background check, and each engagement is scoped by a director, run by a manager and performed hands on keyboard by a tester. For cloud service providers pursuing FedRAMP or payment card validation, keeping the pentest inside the same assessor relationship can simplify evidence handling.
Services and expertise: application, network and mobile penetration testing, cloud and physical testing, hardware and IoT testing, red and purple teaming, AI red teaming, FedRAMP, SOC, PCI DSS and ISO assessments.
7. Bishop Fox
Bishop Fox is led by CEO and co-founder Vincent Liu, with co-founder Francis Brown serving on its board. The firm describes itself as an authority in offensive security and offers both point in time penetration testing and continuous security testing that shows organizations what attackers see.
Bishop Fox’s client base is weighted toward large enterprises. The firm says 70 percent of the Fortune 10 rely on it, 80 percent of the top 10 technology companies test with it, and one in three Fortune 100 companies trust it, and it reports a Net Promoter Score of 72. It is best suited to mature security teams that want external attack surface testing running continuously alongside periodic deep dive application and red team engagements.
Services and expertise: continuous attack surface testing, application and cloud penetration testing, product security reviews, red team readiness, social engineering, offensive security advisory.
8. VerSprite
VerSprite is a cybersecurity firm based at Piedmont Road in Atlanta, Georgia. It is CREST accredited and is known as the creator of PASTA, the Process for Attack Simulation and Threat Analysis, a risk centric threat modeling methodology used by security teams around the world.
That heritage shapes how VerSprite tests. Its pentest engagements are informed by threat models, so attack simulations reflect the business risks and abuse cases that matter most to the client rather than a generic checklist. VerSprite also offers managed security services that combine human and AI driven work. The firm is a good match for product companies that want penetration testing services tied to design level risk analysis.
Services and expertise: PASTA threat modeling, web, mobile and API penetration testing, cloud and network testing, risk based security assessments, managed security services.
9. Software Secured
Software Secured was started in 2010 by Sherif Koussa, its CEO and founder, who previously worked as a software developer, authored security exams for SANS and founded the OWASP Meetup in Ottawa. The company uses dedicated Canadian pentesters and states that it never uses contractors.
Its testers hold OSCP, OSWE, GWAPT and cloud certifications, and the firm says more than 350 high growth SaaS startups, SMBs and enterprises trust it. Software Secured leans into compliance outcomes, with human led pentests mapped to auditor requirements for SOC 2 and reports designed to help clients earn credibility with Fortune 500 buyers. It is a strong fit for SaaS companies that need a reputable pentest company without enterprise level overhead.
Services and expertise: manual web application and API penetration testing, cloud configuration testing, penetration testing as a service, SOC 2 and compliance mapping, remediation support and retesting.
10. Triaxiom Security
Triaxiom Security is based in Charlotte, North Carolina, and focuses on penetration testing, security audits and strategic security consulting. The firm is a CREST accredited penetration testing provider.
Triaxiom sets a high bar for staffing: its engineers have at least five years of direct information security experience, undergo an extensive background check, and many have held Top Secret security clearances. Customer testimonials on its site describe ongoing engagements that range from penetration testing to annual PCI compliance assessments. For small and mid-sized organizations, Triaxiom offers accredited testing with a straightforward engagement model.
Services and expertise: external and internal network penetration testing, web application and wireless testing, social engineering, security audits, PCI compliance assessments, strategic security consulting.
How To Choose Between Penetration Testing Companies
What Is The Test Actually For? Start with the outcome. A pen testing firm hired to satisfy a PCI DSS requirement, a SOC 2 auditor or an enterprise customer’s security review needs to produce evidence in a specific shape, while a pre launch application test should focus on depth and exploitability. Tell each vendor what the report will be used for and ask to see a sample report before you sign.
Which Credentials Matter For Your Scope? Firm level accreditation and individual certifications answer different questions. CREST accreditation, described on the CREST accreditation page, assesses a company’s methodology, data handling and staff competence, while certifications such as OSCP or OSWE show what an individual tester can do. If you need PCI validation, check whether the firm is a QSA company or works alongside one.
Is The Testing Manual, Automated Or Both? Many cheap offers are vulnerability scans with a new cover page. Ask what percentage of the engagement is hands on, who performs it, whether any work is subcontracted, and how findings are validated. Good penetration testing services follow a documented methodology, and NIST’s SP 800-115 technical guide to security testing is a useful benchmark for what planning, discovery, attack and reporting phases should include.
Do You Need A Pentest Or A Red Team? A penetration test aims to find as many exploitable weaknesses as possible within a defined scope. A red team engagement tests whether your people and detection tools can spot and stop a realistic attacker over weeks. If your defenses are mature, the latter may be a better investment, and our list of red team as a service providers covers firms that specialize in it.
How Will Findings Be Fixed And Retested? The report is only useful if issues get resolved. Ask whether retesting is included, how long the vendor will support remediation questions, and whether findings can be exported into your ticketing system. If you also need broader help such as managed detection or incident response, compare pentest vendors against full service cybersecurity firms before deciding whether to consolidate.
Conclusion
Large enterprises that test continuously will find the closest fit with NetSPI and Bishop Fox, while Pen Test Partners and TrustedSec bring deep technical teams and research credentials for complex or high risk environments. Packetlabs, VerSprite and Triaxiom Security offer CREST accredited testing with a clear emphasis on manual work, threat modeling or straightforward engagements for mid-sized firms.
For buyers whose pentest is tied to an audit, A-LIGN and Schellman combine testing with PCI, SOC 2, FedRAMP and ISO assessments, and Software Secured is a focused option for SaaS companies preparing for SOC 2 and enterprise deals. Whichever penetration testing companies make your shortlist, compare sample reports, tester credentials and retesting terms, not just the day rate.
If you want to add your company to this list, drop us a line or submit a form in the Best Choices section. After a thorough review, we’ll decide whether it’s an appropriate addition.
