Company lists · Data refreshed September 2026
Top 25 Security auditing firms based in the United States
RevenueBase identified 3,309 security auditing firms headquartered in the United States as of September 2026 and tracks 41,795 professional contacts across them, including 18,051 with verified work emails and 14,619 with mobile numbers. New York is the largest hub.
This list covers security auditing firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest security auditing firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,222 | ||||
“Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,252 | ||||
“Thales is a global leader in cybersecurity, helping the most trusted organizations in the world protect their most critical applications, data, and identities anywhere at scale.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,232 | ||||
“GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 947 | ||||
“Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 874 | ||||
“Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 844 | ||||
“Today’s threatscape is relentless.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 798 | ||||
“A-LIGN is the leading provider of high-quality, efficient cybersecurity compliance programs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 641 | ||||
“At Network Intelligence, we combine our team of 500+ security professionals with Transilience – our cutting-edge AI platform.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 629 | ||||
“Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 628 | ||||
“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 535 | ||||
“Funded by world-class investors, including Evolution Equity Partners, Silver Lake Partners, Sequoia Capital, GV, Riverwood Capital, and others, SecurityScorecard is the global…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 523 | ||||
“UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program, finding what's vulnerable, stopping…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 473 | ||||
“At Aujas Cybersecurity, we specialize in building and transforming cybersecurity postures to help businesses effectively mitigate risks.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 441 | ||||
“Palo Alto Networks Unit 42 brings together world-renowned threat researchers with an elite team of incident responders and security consultants to create an intelligence-driven…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 365 | ||||
“Welcome to IBN Technologies, LLC, Your Trusted Partner in Cybersecurity, Cloud, and Finance Solutions With 26+ years of expertise, IBN Technologies leads in delivering integrated…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 329 | ||||
“UpGuard is the only platform that unifies cyber risk management across the vendor supply chain, attack surface, and human workforce.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 317 | ||||
“Intelligent Technical Solutions is your trusted business partner for all your Cybersecurity, Managed and Co-managed IT support, Risk & Compliance, Data Analytics, and Consulting…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 272 | ||||
“Prescient Security is a global cybersecurity and compliance firm delivering risk-based audits, advanced penetration testing, and end-to-end framework support.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 268 | ||||
“We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | Securitypal AIPartial evidence | 263 | |||
“SecurityPal is a Cybersecurity Assurance Management Platform that blends AI-powered automation with expert oversight to help organizations accelerate trust, reduce friction, and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 255 | ||||
“Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 244 | ||||
“Securin is obsessed with helping leaders continuously improve their security posture.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 243 | ||||
“Thoropass is the only end-to-end cybersecurity auditor.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | LoginsoftIndirect evidence | 220 | |||
“For over 20 years, leading companies in Telecom, Cybersecurity, Healthcare, Banking, New Media, and more have come to rely on Loginsoft as a trusted resource for technology talent.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 208 | ||||
“TAC Security (NSE: TAC) TAC Security, a leading publicly listed global cybersecurity company specializing in vulnerability management, today serves clients across 100 countries…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 3,309 security auditing firms based in the United States
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Security auditing firms based in the United States at a glance
As of Sep 6, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among security auditing firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “security auditing firms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among security auditing firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 18,051 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Security auditing firms by metro
- Security auditing firms in New York86
- Security auditing firms in Atlanta77
- Security auditing firms in Austin67
- Security auditing firms in Houston66
- Security auditing firms in Tampa64
- Security auditing firms in Washington64
- Security auditing firms in Chicago58
- Security auditing firms in Dallas54
- Security auditing firms in Miami50
- Security auditing firms in San Francisco50
- Security auditing firms in Los Angeles43
- Security auditing firms in San Diego36
- Security auditing firms in Arlington33
- Security auditing firms in Charlotte32
- Security auditing firms in Seattle31
- Security auditing firms in Las Vegas27
- Security auditing firms in Columbia26
- Security auditing firms in Denver26
Frequently asked
How many security auditing firms are there based in the United States?
RevenueBase identified 3,309 security auditing firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
OPTIV, headquartered in Leawood, tops this list with the largest team on record.
Which city has the most security auditing firms?
New York leads with 86 headquartered companies, followed by Atlanta (77) and Austin (67).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 18,051 verified decision-maker contacts tracked across these 3,309 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 2026.
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Security auditing firms by geography
- Security auditing firms based in the United Kingdom
- Security auditing firms based in France
- Security auditing firms based in Canada
- Security auditing firms based in Brazil
- Security auditing firms based in Germany
- Security auditing firms based in Australia
- Security auditing firms based in Spain
- Security auditing firms based in the Netherlands
- Security auditing firms based in Poland
- Security auditing firms based in South Africa
- Security auditing firms based in Switzerland
- Security auditing firms based in Italy
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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