Company lists · Data refreshed September 2026
Top 22 Security consulting firms based in Seattle, United States
RevenueBase identified 52 security consulting firms headquartered in Seattle, United States as of September 2026 and tracks 533 professional contacts across them, including 218 with verified work emails. New York is the largest hub.
This list covers security consulting firms headquartered in Seattle, 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 22 largest security consulting firms based in Seattle, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 107 | ||||
“IOActive is a trusted partner for Global enterprises, providing research-fueled security services across all industries.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 39 | ||||
“Anvil is an information security consulting firm focused on top tier consulting.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Kalles GroupPartial evidence | 36 | |||
“Kalles Group partners with CIOs, CISOs, and security leaders to strengthen security programs, reduce operational risk, and build resilience during periods of change.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 33 | ||||
“Advantage Partners is a security & compliance organization dedicated to helping emerging technology companies navigate the complexities of security and compliance.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 27 | ||||
“We are a cybersecurity company specializing in governance, risk management and compliance, Cloud Security, and Application Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 22 | ||||
“DSE is a boutique security firm with a focus on Active Directory.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 | ||||
“Copperhead Consulting is a team of highly capable Agents, Investigators, Special Operations Veterans and technical professionals.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Rhino Security Labs, INCPartial evidence | 20 | |||
“Rhino Security Labs is a top penetration testing and security assessment firm with a focus on cloud pentesting (AWS, GCP, Azure), network pentesting, web application pentesting…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | NRG Fire ConsultingPartial evidence | 15 | |||
“We provide Fire protection consulting and design services throughout the U.S.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Markgraf ConsultingStrong evidence | 13 | |||
“Markgraf Consulting is a premier technology consulting firm specializing in SAP security, cloud solutions, and system architecture.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | Secure Source International, LLCPartial evidence | 10 | |||
“Secure Source International is a global security risk mitigation firm that serves family offices, HNW individuals, corporate enterprises and law firms throughout the US and Europe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 3 | ||||
“At Signal Security of Western Washington, our unwavering commitment is to set the gold standard in security services across residential, commercial, retail, and institutional…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 3 | ||||
“We are an IT consulting team that partners with clients to elevate their IT security skills and knowledge in crafting, deploying, and supporting intelligent and leading-edge IP…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | Positroniq, LLCPartial evidence | 3 | |||
“At Positroniq, we help to protect organizations through assessment and advisory services designed to improve security, risk, and compliance programs and processes.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | ZOVEPartial evidence | 2 | |||
“Zove Security secures the products and platforms that power innovation and underpin all our digital lives.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 2 | ||||
“Culper Partners offers strategic business consulting at the intersection of technology, national security, law enforcement, public policy and regulation.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Section9labsIndirect evidence | 2 | |||
“Section9Labs is a startup based in Seattle, WA.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | Verification Labs, LLCPartial evidence | 2 | |||
“Verification Labs is a Seattle-based security company that places an emphasis on doing extremely in-depth technical testing so we can provide our clients with the most thorough…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Stepfar Technology GroupIndirect evidence | 1 | |||
“At Stepfar Technology Group, we are dedicated to empowering businesses with cutting-edge technology solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | Seattlepro EnterprisesIndirect evidence | 1 | |||
“SeattlePro Enterprises is a close-knit team of creative visionaries offering companies the guidance and education professionals need to stay competitive in today's market.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 1 | ||||
“Fretwork Security Advisors is a consultancy dedicated to delivering multi-disciplinary advisory services to clients in the executive suite.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 1 | ||||
“Security should be for humans, not just the few who work in the industry.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 22 of 52 security consulting firms based in Seattle, United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 218 reachable decision-makers.
Free signup · no credit card
Security consulting firms based in Seattle, United States at a glance
As of Sep 6, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 52 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 security consulting 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 Seattle, United States whose own description of what they do matches “security consulting 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 consulting firms, and records with no verified work email. Companies headquartered outside Seattle 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, 218 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 consulting firms by metro in the United States
- Security consulting firms in New York189
- Security consulting firms in Washington139
- Security consulting firms in Houston124
- Security consulting firms in Atlanta118
- Security consulting firms in Austin96
- Security consulting firms in Chicago90
- Security consulting firms in Dallas90
- Security consulting firms in Los Angeles88
- Security consulting firms in Miami88
- Security consulting firms in San Francisco73
- Security consulting firms in Arlington65
- Security consulting firms in Tampa63
- Security consulting firms in Denver56
- Security consulting firms in San Diego55
- Security consulting firms in Alexandria53
- Security consulting firms in Charlotte53
- Security consulting firms in Seattle52
- Security consulting firms in Boston47
- Security consulting firms in Orlando43
- Security consulting firms in San Antonio43
- Security consulting firms in Las Vegas41
- Security consulting firms in Columbia39
- Security consulting firms in Phoenix39
- Security consulting firms in Reston37
- Security consulting firms in Raleigh36
- Security consulting firms in Minneapolis35
- Security consulting firms in Baltimore33
- Security consulting firms in Mclean33
- Security consulting firms in Huntsville29
- Security consulting firms in Columbus28
- Security consulting firms in Herndon28
- Security consulting firms in San Jose28
- Security consulting firms in Pittsburgh27
- Security consulting firms in Ashburn26
- Security consulting firms in Colorado Springs26
- Security consulting firms in Scottsdale26
- Security consulting firms in Philadelphia25
- Security consulting firms in Richmond25
Frequently asked
How many security consulting firms are there based in Seattle, United States?
RevenueBase identified 52 security consulting firms headquartered in Seattle, 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?
Ioactive, INC, headquartered in Seattle, tops this list with the largest team on record.
Which city has the most security consulting firms?
New York leads with 189 headquartered companies, followed by Washington (139) and Houston (124).
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 218 verified decision-maker contacts tracked across these 52 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.
Ready to reach these companies? Verified emails and direct dials for all 52 security consulting firms based in Seattle, United States. Start with a free account, no credit card.
Get the full listRelated lists
Security consulting firms by geography
- Security consulting firms based in the United States
- Security consulting firms based in the United Kingdom
- Security consulting firms based in France
- Security consulting firms based in Brazil
- Security consulting firms based in Canada
- Security consulting firms based in Germany
- Security consulting firms based in Australia
- Security consulting firms based in the Netherlands
- Security consulting firms based in Mexico
- Security consulting firms based in Italy
- Security consulting firms based in Spain
- Security consulting firms based in South Africa
Browse the directory
Browse: Companies home · Security consulting firms in United States · All United States lists · All Security consulting firms lists · New lists
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Security consulting firms based in the United States
- Security consulting firms based in the United Kingdom
- Security consulting firms based in France
- Security consulting firms based in Brazil
- Security consulting firms based in Canada
- Security consulting firms based in Germany