Company lists · Data refreshed September 2026
Top 25 Information security consulting firms based in Fairfax, United States
RevenueBase identified 43 information security consulting firms headquartered in Fairfax, United States as of September 2026 and tracks 575 professional contacts across them, including 176 with verified work emails. Across the United States, New York is the largest hub for this category (280 companies); Fairfax has 43.
This list covers information security consulting firms headquartered in Fairfax, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 information security consulting firms based in Fairfax, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 104 contacts → | ||||
Partial evidence “OnPoint is a technology and consulting services partner helping government leaders secure their systems, effectively operate, and deliver critical services in today’s increasingly…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 2 | 81 contacts → | ||||
Indirect evidence “JCS Solutions is a premier cybersecurity and technology solutions provider.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 3 | 70 contacts → | ||||
Indirect evidence “When organizations need to be on time-and on budget-they call InfoReliance.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 4 | 53 contacts → | ||||
Partial evidence “True Zero Technologies ("True Zero") is a seasoned, Veteran-Owned Small Business (VOSB) specializing in comprehensive cybersecurity and consulting services.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 5 | 39 contacts → | ||||
Partial evidence “USmax Corporation is an ISO 9001:2015 registered, ISO registered, ISO 27001:2013 registered, and CMMI-SVC Level 3 appraised Enterprise Information Technology (IT) and Professional…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 6 | 23 contacts → | ||||
Indirect evidence “We provide Vulnerability services including: Vulnerability Assessments Penetration Testing Compliance and Policy Analysis Cybersecurity as a Service (also known as MSP) Cloud…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 contacts → | ||||
Indirect evidence “Sensei Enterprises, Inc.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 8 | 16 contacts → | ||||
Strong evidence “SeNet International Corporation is a company of information technology consulting professionals committed to helping public and private sector organizations securely operate their…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 9 | 15 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 10 | 13 contacts → | ||||
Indirect evidence “CMMC Level 2 | CAGE 6VE87 | UEI DL3JL6J1XG98 | SBA 8(a)| 8(a) STARS | HACS SINs | CMMI-SVC | ISO 9001 | ISO 27001 | ISO | Assurit, an 8(a) certified and recognized leader in…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 11 | 9 contacts → | ||||
Partial evidence “A Cybersecurity Firm Focused on Securing Mission-Critical Systems, Protecting Supply Chains, and Safeguarding Digital Assets Within Federal Agencies, While Ensuring Regulatory…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 12 | 9 contacts → | ||||
Partial evidence “Systems Integration, Cloud Migration, Software Development, Network Security, Applications Security, Industrial Cyber Security Quality Assurance, RF Benchmark, Wireless…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 contacts → | ||||
Strong evidence “IT consulting company providing cyber security, analytics and data science services.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 14 | 8 contacts → | ||||
Partial evidence “Implementing Zero Trust Architecture to Enhance Security, Productivity, and Data Integrity, while Optimizing for Future-Readiness and Mission Success 8(a) Certified Small Business…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 15 | 8 contacts → | ||||
Indirect evidence “Committed to Intelligent Risk Defense.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 16 | 6 contacts → | ||||
Partial evidence “CapSentinel is a Small Business that offers world class Information Technology (IT) Risk, Cybersecurity, and financial management solutions to help commercial and federal…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 contacts → | ||||
Indirect evidence “Headquartered in Fairfax, VA, Cleared Systems specializes in helping federal contractors and highly regulated organizations meet cybersecurity and compliance requirements under…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 18 | 3 contacts → | ||||
Indirect evidence “Crosshair Cyber was founded by industry veterans who have over 20 years’ experience defending some of the most targeted, critical networks in the world-from banks to key…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3 contacts → | ||||
Partial evidence “We specialize in transforming security and compliance from a perceived obstacle into a strategic growth enabler.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 contacts → | ||||
Indirect evidence “MSNET SOLUTIONS is owned and operated by professional IT consultants who know what it takes to design, implement, and support secure networks utilizing the latest technologies…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Partial evidence “A professional services firm focused on helping organizations successfully mitigate threats with Microsoft Security, Compliance, and Identity solutions.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Partial evidence “LEADING CYBER SOLUTIONS WavePort Security applies proven tools, professional services, and years of cyber-focused experience to create security strategies that provide unrivaled…” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Partial evidence “GroCyber brings over 4 decades of cyber security experience supporting large enterprise security programs and growing start-up and turn-around companies.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 contacts → | ||||
Partial evidence “If securing your IT systems, network infrastructure, and facilities is foremost on your mind, Xpect Solutions can help.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
| 25 | 1 contacts → | ||||
Partial evidence “In today’s fast-paced and competitive market, businesses must boost revenue, cut costs, and streamline operations, all while prioritizing security.” Source: RevenueBase Database · checked Sep 14, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: information security consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names information security consulting firms.
- Partial evidence
- Its own public description names part of information security consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name information security consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 43 information security consulting firms based in Fairfax, United States
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Information security consulting firms based in Fairfax, United States at a glance
As of Sep 14, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Fairfax, so it is reported there. Company counts and contact totals on this page are exact for Fairfax, over 43 companies.
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 information security consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Fairfax, United States whose own description of what they do matches “information security consulting firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names information security consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among information security consulting firms, and records with no verified work email. Companies headquartered outside Fairfax 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 its RevenueBase Smart Search 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, 176 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 14, 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.
Information security consulting firms by metro in the United States
- Information security consulting firms in New York280
- Information security consulting firms in Washington186
- Information security consulting firms in Houston181
- Information security consulting firms in Atlanta166
- Information security consulting firms in Austin154
- Information security consulting firms in Dallas146
- Information security consulting firms in Chicago139
- Information security consulting firms in Miami124
- Information security consulting firms in San Francisco114
- Information security consulting firms in Tampa106
- Information security consulting firms in San Diego91
- Information security consulting firms in Los Angeles88
- Information security consulting firms in Arlington78
- Information security consulting firms in Seattle77
- Information security consulting firms in Boston75
- Information security consulting firms in Charlotte75
- Information security consulting firms in Denver73
- Information security consulting firms in Alexandria67
- Information security consulting firms in Orlando62
- Information security consulting firms in Phoenix61
- Information security consulting firms in San Antonio61
- Information security consulting firms in Columbia57
- Information security consulting firms in Las Vegas57
- Information security consulting firms in Raleigh54
- Information security consulting firms in Reston53
- Information security consulting firms in Ashburn51
- Information security consulting firms in Mclean49
- Information security consulting firms in Baltimore48
- Information security consulting firms in Portland46
- Information security consulting firms in Columbus43
- Information security consulting firms in Huntsville42
- Information security consulting firms in Minneapolis41
- Information security consulting firms in Plano41
- Information security consulting firms in Indianapolis39
- Information security consulting firms in Philadelphia38
- Information security consulting firms in Richmond38
- Information security consulting firms in Nashville37
- Information security consulting firms in Scottsdale37
- Information security consulting firms in Wilmington37
- Information security consulting firms in Colorado Springs36
- Information security consulting firms in Herndon36
- Information security consulting firms in Pittsburgh36
- Information security consulting firms in Fort Lauderdale35
- Information security consulting firms in San Jose34
- Information security consulting firms in Frisco32
- Information security consulting firms in Irvine31
- Information security consulting firms in Sacramento30
- Information security consulting firms in Rockville29
- Information security consulting firms in Dover28
- Information security consulting firms in Alpharetta27
- Information security consulting firms in Vienna27
- Information security consulting firms in Knoxville25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names information security consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many information security consulting firms are there based in Fairfax, United States?
RevenueBase identified 43 information security consulting firms headquartered in Fairfax, 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?
Onpoint, headquartered in Fairfax, tops this list with the largest team on record.
Which city in the United States has the most information security consulting firms?
New York leads the United States with 280 headquartered companies, followed by Washington (186) and Houston (181). Fairfax has 43.
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 176 verified decision-maker contacts tracked across these 43 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 14, 2026.
Ready to reach these companies? Verified emails and direct dials for all 43 information security consulting firms based in Fairfax, United States. Start with a free account, no credit card.
Download this list →Related lists
Information security consulting firms by geography
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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 Smart Search, 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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