Company lists · Data refreshed September 2026
Top 19 Investigation firms based in Washington, United States
RevenueBase identified 48 company matches for investigation firms associated with Washington, United States as of September 2026 and tracks 464 professional contacts across them, including 136 with verified work emails. Across the United States, New York is the largest hub for this category (145 companies); Washington has 48.
This list covers company matches for investigation firms associated with Washington, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 20, 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 19 largest investigation firms based in Washington, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 142 contacts → | ||||
Exact match “PSA is a global due diligence and investigations firm headquartered in Washington, DC.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 2 | 66 contacts → | ||||
Exact match “Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 3 | 58 contacts → | ||||
Exact match “iDS is a strategic consulting, technology, and expert services firm.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 4 | 37 contacts → | ||||
Exact match “Global Security & Innovative Strategies (GSIS) leverages its extensive private sector, homeland, public security, public sector and international expertise to provide…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 5 | 10 contacts → | ||||
Exact match “Dinolt Becnel & Wells Investigative Group is a Washington, D.C.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 6 | 8 contacts → | ||||
Exact match “Greenberg Corporate Intelligence offers premium intelligence services that support attorneys, private equity firms, hedge funds, and compliance teams.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 7 | 6 contacts → | ||||
Exact match “Our professionals have focused our careers upon becoming functionally excellent in the fields of accounting and finance.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 8 | 6 contacts → | ||||
Exact match “Taylor Research Group is a litigation and environmental research company with extensive experience in providing historical, investigative, and analytical research services and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 9 | 6 contacts → | ||||
Exact match “Forward Global conducts investigative due diligence, business intelligence research, and international risk assessments for financial institutions, corporations, and law firms.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 10 | 5 contacts → | ||||
Exact match “For over 40 years, SLA principals have provided quantitative securities analysis and investor suitability and supervision analysis to clients involved in arbitrations, regulatory…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 11 | 4 contacts → | ||||
Exact match “What We Do: We provide CFOs, corporate security directors, and business professionals with investigative services, consultations, and risk assessments to help our clients make the…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 12 | 4 contacts → | ||||
Exact match “XK Group provides advisory services Due Diligence Security Assessments Competitive Intelligence Background Investigations Crisis Management Insider Threat Analysis Fraud…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 13 | 3 contacts → | ||||
Exact match “Owl Consultancy Group is a boutique investigative consultancy firm specializing in deep dive investigations resulting in simple and actionable results.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 14 | 3 contacts → | ||||
Exact match “WCD Business Solutions provides full-scope background investigations, private investigation services, surveillance, personnel security staffing, case management system…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 15 | 2 contacts → | ||||
Exact match “Mercury Security Consulting LLC specializes in radio frequency forensics, intellectual property loss countermeasures and intrusion detection systems.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 16 | 2 contacts → | ||||
Exact match “Butler Investigations is an investigative services firm providing comprehensive solutions to attorneys and law firms across the country.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 17 | 1 contacts → | ||||
Exact match “Veretus is a strategic intelligence and investigations firm established to provide corporations, law firms, hedge funds, private equity firms, family offices and high net worth…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 18 | 1 contacts → | ||||
Exact match “Bridgehaven Consulting is a boutique forensic accounting firm that helps companies and audit firms solve accounting, auditing, financial reporting and internal controls problems…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 19 | 1 contacts → | ||||
Exact match “Nighthawk Strategies is a leading professional investigation agency specializing in comprehensive investigation and research solutions for legal teams nationwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “investigation firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 19 of 48 investigation firms based in Washington, United States
See the full list, filter by size, metro and specialty, and access 136 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Investigation firms based in Washington, United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 48 companies.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- 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
- Company records associated with Washington, United States whose business descriptions match “investigation firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- 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 displayed company carries at least one verified work email. RevenueBase tracks 136 professional contacts with verified work emails across the full matched dataset. 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 20, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Investigation firms by metro in the United States
- Investigation firms in New York145
- Investigation firms in Houston74
- Investigation firms in Chicago65
- Investigation firms in Los Angeles61
- Investigation firms in Miami60
- Investigation firms in Dallas46
- Investigation firms in Atlanta45
- Investigation firms in Phoenix37
- Investigation firms in Denver34
- Investigation firms in Fort Lauderdale31
- Investigation firms in Tampa31
- Investigation firms in Boston29
- Investigation firms in San Diego29
- Investigation firms in Seattle29
- Investigation firms in Orlando28
- Investigation firms in Las Vegas27
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “investigation firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many investigation firms are there based in Washington, United States?
RevenueBase identified 48 company matches for investigation firms associated with Washington, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
PSA tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city in the United States has the most investigation firms?
New York leads the United States with 145 company records, followed by Houston (74) and Chicago (65). Washington has 48.
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 136 professional contacts with verified work emails tracked across these 48 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
Ready to reach these companies? Verified emails and direct dials for all 48 investigation firms based in Washington, United States. Start with a free account, no credit card.
Download this list →Related lists
Investigation firms by geography
- Investigation firms based in Mumbai, India
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- Investigation firms based in Chicago, United States
- Investigation firms based in Dallas, United States
- Investigation firms based in Denver, United States
- Investigation firms based in Fort Lauderdale, United States
- Investigation firms based in Houston, United States
- Investigation firms based in Las Vegas, United States
- Investigation firms based in Los Angeles, United States
- Investigation firms based in Miami, United States
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
- Investigation firms based in Mumbai, India
- Investigation firms based in New Delhi, India
- Investigation firms based in Atlanta, United States
- Investigation firms based in Boston, United States
- Investigation firms based in Chicago, United States
- Investigation firms based in Dallas, United States
Company intelligence · public preview
Top 19 investigation firms based in Washington, United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 48 matching company records for investigation firms based in Washington, United States, with 464 tracked contacts and 136 verified work emails.
This public preview shows 19 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 20, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 19 investigation firms based in Washington, United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  PSApsagroup.comHQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 142 contacts → |
“PSA is a global due diligence and investigations firm headquartered in Washington, DC.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Investigative Group Internationaligint.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 66 contacts → |
“Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Idiscovery Solutionsidsinc.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 58 contacts → |
“iDS is a strategic consulting, technology, and expert services firm.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 37 contacts → |
“Global Security & Innovative Strategies (GSIS) leverages its extensive private sector, homeland, public security, public sector and international expertise to provide…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 10 contacts → |
“Dinolt Becnel & Wells Investigative Group is a Washington, D.C.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Greenberg Corporate Intelligence LLCgreenbergintel.comHQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 8 contacts → |
“Greenberg Corporate Intelligence offers premium intelligence services that support attorneys, private equity firms, hedge funds, and compliance teams.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Credibility International, An HKA Companycredibilityconsulting.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 6 contacts → |
“Our professionals have focused our careers upon becoming functionally excellent in the fields of accounting and finance.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Taylor Research Grouptaylorresearchgroup.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 6 contacts → |
“Taylor Research Group is a litigation and environmental research company with extensive experience in providing historical, investigative, and analytical research services and…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Forward Riskforwardglobal.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 6 contacts → |
“Forward Global conducts investigative due diligence, business intelligence research, and international risk assessments for financial institutions, corporations, and law firms.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Securities Litigation Analysts, LLCsla-dc.comHQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 5 contacts → |
“For over 40 years, SLA principals have provided quantitative securities analysis and investor suitability and supervision analysis to clients involved in arbitrations, regulatory…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 4 contacts → |
“What We Do: We provide CFOs, corporate security directors, and business professionals with investigative services, consultations, and risk assessments to help our clients make the…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  XK Groupxkgroup.orgHQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 4 contacts → |
“XK Group provides advisory services Due Diligence Security Assessments Competitive Intelligence Background Investigations Crisis Management Insider Threat Analysis Fraud…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  OWL Consultancy Groupowlconsultancygroup.comHQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 3 contacts → |
“Owl Consultancy Group is a boutique investigative consultancy firm specializing in deep dive investigations resulting in simple and actionable results.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | WCD Business Solutions LLCwcdintegrity.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 3 contacts → |
“WCD Business Solutions provides full-scope background investigations, private investigation services, surveillance, personnel security staffing, case management system…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Mercury Security Consulting LLCmercurysec.comHQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 2 contacts → |
“Mercury Security Consulting LLC specializes in radio frequency forensics, intellectual property loss countermeasures and intrusion detection systems.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Butler Investigationsjbutlerinv.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 2 contacts → |
“Butler Investigations is an investigative services firm providing comprehensive solutions to attorneys and law firms across the country.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Veretus Groupveretus.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 1 contacts → |
“Veretus is a strategic intelligence and investigations firm established to provide corporations, law firms, hedge funds, private equity firms, family offices and high net worth…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Bridgehaven Consulting, LLCbridgehavenconsulting.comHQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 1 contacts → |
“Bridgehaven Consulting is a boutique forensic accounting firm that helps companies and audit firms solve accounting, auditing, financial reporting and internal controls problems…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Nighthawk Strategiesnighthawkstrategies.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 1 contacts → |
“Nighthawk Strategies is a leading professional investigation agency specializing in comprehensive investigation and research solutions for legal teams nationwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 19 of 48 company matches
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Investigation firms: dataset insights
September 20, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
48 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 48 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 20, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Investigation firms by metro in the United States
- Investigation firms in New York145
- Investigation firms in Houston74
- Investigation firms in Chicago65
- Investigation firms in Los Angeles61
- Investigation firms in Miami60
- Investigation firms in Dallas46
- Investigation firms in Atlanta45
- Investigation firms in Phoenix37
- Investigation firms in Denver34
- Investigation firms in Fort Lauderdale31
- Investigation firms in Tampa31
- Investigation firms in Boston29
- Investigation firms in San Diego29
- Investigation firms in Seattle29
- Investigation firms in Orlando28
- Investigation firms in Las Vegas27
Questions about this company list
What does Exact match mean for investigation firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many investigation firms did RevenueBase find based in Washington, United States?
The saved snapshot records 48 matching company records, 464 tracked contacts and 136 verified emails. The public preview displays 19 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 20, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Investigation firms by geography
- Investigation firms based in Mumbai, India
- Investigation firms based in New Delhi, India
- Investigation firms based in Atlanta, United States
- Investigation firms based in Boston, United States
- Investigation firms based in Chicago, United States
- Investigation firms based in Dallas, United States
- Investigation firms based in Denver, United States
- Investigation firms based in Fort Lauderdale, United States
- Investigation firms based in Houston, United States
- Investigation firms based in Las Vegas, United States
- Investigation firms based in Los Angeles, United States
- Investigation firms based in Miami, United States
Cite this list
RevenueBase Data Team. Top 19 investigation firms based in Washington, United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/investigation-firms/united-states/washington.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Investigation firms based in Mumbai, India
- Investigation firms based in New Delhi, India
- Investigation firms based in Atlanta, United States
- Investigation firms based in Boston, United States
- Investigation firms based in Chicago, United States
- Investigation firms based in Dallas, United States
Company intelligence · public preview
Top 19 investigation firms based in Washington, United States
RevenueBase records 48 matching company records for investigation firms based in Washington, United States, with 464 tracked contacts and 136 verified work emails.
This public preview shows 19 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 20, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 19 investigation firms based in Washington, United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | PSApsagroup.com HQ: Washington, DC, United StatesReported employees: 51-200 | Washington, DC, United States | 51-200 | Exact match | 142 contacts → |
“PSA is a global due diligence and investigations firm headquartered in Washington, DC.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Investigative Group Internationaligint.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 66 contacts → |
“Investigative Group International (IGI) is the premier investigative firm conducting independent, high-touch investigations worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Idiscovery Solutionsidsinc.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 58 contacts → |
“iDS is a strategic consulting, technology, and expert services firm.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 37 contacts → |
“Global Security & Innovative Strategies (GSIS) leverages its extensive private sector, homeland, public security, public sector and international expertise to provide…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 10 contacts → |
“Dinolt Becnel & Wells Investigative Group is a Washington, D.C.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Greenberg Corporate Intelligence LLCgreenbergintel.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 8 contacts → |
“Greenberg Corporate Intelligence offers premium intelligence services that support attorneys, private equity firms, hedge funds, and compliance teams.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Credibility International, An HKA Companycredibilityconsulting.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 6 contacts → |
“Our professionals have focused our careers upon becoming functionally excellent in the fields of accounting and finance.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Taylor Research Grouptaylorresearchgroup.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 6 contacts → |
“Taylor Research Group is a litigation and environmental research company with extensive experience in providing historical, investigative, and analytical research services and…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Forward Riskforwardglobal.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 6 contacts → |
“Forward Global conducts investigative due diligence, business intelligence research, and international risk assessments for financial institutions, corporations, and law firms.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Securities Litigation Analysts, LLCsla-dc.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 5 contacts → |
“For over 40 years, SLA principals have provided quantitative securities analysis and investor suitability and supervision analysis to clients involved in arbitrations, regulatory…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 4 contacts → |
“What We Do: We provide CFOs, corporate security directors, and business professionals with investigative services, consultations, and risk assessments to help our clients make the…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | XK Groupxkgroup.org HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 4 contacts → |
“XK Group provides advisory services Due Diligence Security Assessments Competitive Intelligence Background Investigations Crisis Management Insider Threat Analysis Fraud…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | OWL Consultancy Groupowlconsultancygroup.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 3 contacts → |
“Owl Consultancy Group is a boutique investigative consultancy firm specializing in deep dive investigations resulting in simple and actionable results.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | WCD Business Solutions LLCwcdintegrity.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 3 contacts → |
“WCD Business Solutions provides full-scope background investigations, private investigation services, surveillance, personnel security staffing, case management system…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Mercury Security Consulting LLCmercurysec.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 2 contacts → |
“Mercury Security Consulting LLC specializes in radio frequency forensics, intellectual property loss countermeasures and intrusion detection systems.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Butler Investigationsjbutlerinv.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 2 contacts → |
“Butler Investigations is an investigative services firm providing comprehensive solutions to attorneys and law firms across the country.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Veretus Groupveretus.com HQ: Washington, DC, United StatesReported employees: 11-50 | Washington, DC, United States | 11-50 | Exact match | 1 contacts → |
“Veretus is a strategic intelligence and investigations firm established to provide corporations, law firms, hedge funds, private equity firms, family offices and high net worth…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Bridgehaven Consulting, LLCbridgehavenconsulting.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 1 contacts → |
“Bridgehaven Consulting is a boutique forensic accounting firm that helps companies and audit firms solve accounting, auditing, financial reporting and internal controls problems…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Nighthawk Strategiesnighthawkstrategies.com HQ: Washington, DC, United StatesReported employees: 1-10 | Washington, DC, United States | 1-10 | Exact match | 1 contacts → |
“Nighthawk Strategies is a leading professional investigation agency specializing in comprehensive investigation and research solutions for legal teams nationwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 19 of 48 company matches
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Investigation firms: dataset insights
September 20, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
48 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 48 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 20, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Investigation firms by metro in the United States
- Investigation firms in New York145
- Investigation firms in Houston74
- Investigation firms in Chicago65
- Investigation firms in Los Angeles61
- Investigation firms in Miami60
- Investigation firms in Dallas46
- Investigation firms in Atlanta45
- Investigation firms in Phoenix37
- Investigation firms in Denver34
- Investigation firms in Fort Lauderdale31
- Investigation firms in Tampa31
- Investigation firms in Boston29
- Investigation firms in San Diego29
- Investigation firms in Seattle29
- Investigation firms in Orlando28
- Investigation firms in Las Vegas27
Questions about this company list
What does Exact match mean for investigation firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many investigation firms did RevenueBase find based in Washington, United States?
The saved snapshot records 48 matching company records, 464 tracked contacts and 136 verified emails. The public preview displays 19 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 20, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Investigation firms by geography
- Investigation firms based in Mumbai, India
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- Investigation firms based in Boston, United States
- Investigation firms based in Chicago, United States
- Investigation firms based in Dallas, United States
- Investigation firms based in Denver, United States
- Investigation firms based in Fort Lauderdale, United States
- Investigation firms based in Houston, United States
- Investigation firms based in Las Vegas, United States
- Investigation firms based in Los Angeles, United States
- Investigation firms based in Miami, United States
Cite this list
RevenueBase Data Team. Top 19 investigation firms based in Washington, United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/investigation-firms/united-states/washington.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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