Company lists · Data refreshed September 2026
Top 25 Investigation firms based in Los Angeles, United States
RevenueBase identified 61 company matches for investigation firms associated with Los Angeles, United States as of September 2026 and tracks 1,482 professional contacts across them, including 406 with verified work emails. Across the United States, New York is the largest hub for this category (145 companies); Los Angeles has 61.
This list covers company matches for investigation firms associated with Los Angeles, 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 25 largest investigation firms based in Los Angeles, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 626 contacts → | ||||
Exact match “Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 2 | 232 contacts → | ||||
Exact match “Founded in 1998, Resolution Economics provides sophisticated economic, statistical, and financial analyses, forensic investigations, forensic technology, dispute advisory, expert…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 3 | 137 contacts → | ||||
Exact match “Marshall & Stevens has been a leader in the valuation and appraisal industry since its founding in 1932.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 4 | 91 contacts → | ||||
Exact match “Black Box Security Inc.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 5 | 69 contacts → | ||||
Exact match “Checkers International is a WOC-owned, attorney-led provider of background checks and social media screening services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 6 | 28 contacts → | ||||
Exact match “Palicon Group is a Southern California based firm specializing in workplace investigations, security, and public safety consulting.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 7 | 21 contacts → | ||||
Exact match “On Watch LLC brings together over 200 years of US military, federal, state, and local law enforcement experience.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 8 | 16 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 9 | 15 contacts → | ||||
Exact match “Origin is a private investigation and intelligence agency.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 10 | 12 contacts → | ||||
Exact match “Engel & Engel has been engaged in the practice of forensic accounting and expert testimony for 30 years.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 11 | 11 contacts → | ||||
Exact match “We are Independent Adjusters & Private Investigators, Serving all of California.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 12 | 10 contacts → | ||||
Exact match “Public Interest Investigations is a leading provider of neutral, trauma-informed workplace investigations, Title IX investigations, and criminal investigations for public…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 13 | 10 contacts → | ||||
Exact match “Investigative Consultants is an independent, highly skilled, and fully licensed professional investigative company dedicated to “Protecting the Rights of Creative Minds®”.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 14 | 6 contacts → | ||||
Exact match “Nickerson Research, Inc.(NRI) has been finding and clearing information, footage, and photographs for over 30 years (since 1991) and has been 100% woman-owned since the beginning…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 15 | 6 contacts → | ||||
Exact match “Lynx Insights is an investigations firm that finds facts in a world of opinions, diversions and misinformation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 16 | 3 contacts → | ||||
Exact match “Los Angeles based Sunset Blvd Investigations, Inc, provides investigative services to clients all over the world.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 17 | 2 contacts → | ||||
Exact match “Grutman Law is a woman-owned employment law firm that specializes in conducting independent, legally defensible workplace investigations into complaints of discrimination…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 18 | 2 contacts → | ||||
Exact match “Global Polygraph & Security is a Los Angeles based professional polygraph and investigative services firm specializing in credible, evidence based truth verification for legal…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 19 | 2 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 20 | 2 contacts → | ||||
Exact match “Founded by Angela Reddock-Wright in 2011, the Reddock Law Group is a dispute resolution and investigation firm specializing in the resolution of employment and labor law and Title…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 21 | 2 contacts → | ||||
Exact match “Tristar Investigation is a full-service detective agency with a 28-year track record of delivering first-class investigative results in California and for clients worldwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 22 | 2 contacts → | ||||
Exact match “VWM Analytics is now part of J.S.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 23 | 2 contacts → | ||||
Exact match “Investigative Production Services for the Global Film Industry” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 24 | 2 contacts → | ||||
Exact match “We redefine modern forensic accounting at MSN Forensics by combining AI-powered technology and decades of investigative expertise.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase | |||||
| 25 | 1 contacts → | ||||
Exact match “At DSWeiser Legal, our purpose is clear, to help our clients manage risk by conducting thorough, prompt, and impartial workplace and campus investigations.” 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 25 of 61 investigation firms based in Los Angeles, United States
See the full list, filter by size, metro and specialty, and access 406 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Investigation firms based in Los Angeles, 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 Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 61 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 Los Angeles, 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 406 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 Miami60
- Investigation firms in Washington48
- 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 Los Angeles, United States?
RevenueBase identified 61 company matches for investigation firms associated with Los Angeles, 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?
Professional Security Consultants, INC 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). Los Angeles has 61.
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 406 professional contacts with verified work emails tracked across these 61 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 61 investigation firms based in Los Angeles, 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
- 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 Miami, United States
- Investigation firms based in New York, 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 25 investigation firms based in Los Angeles, 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 61 matching company records for investigation firms based in Los Angeles, United States, with 1,482 tracked contacts and 406 verified work emails.
This public preview shows 25 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 25 investigation firms based in Los Angeles, 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 |  Professional Security Consultants, INCpscsite.comHQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 626 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Resolution Economicsresecon.comHQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 232 contacts → |
“Founded in 1998, Resolution Economics provides sophisticated economic, statistical, and financial analyses, forensic investigations, forensic technology, dispute advisory, expert…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Marshall & Stevensmarshall-stevens.comHQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 137 contacts → |
“Marshall & Stevens has been a leader in the valuation and appraisal industry since its founding in 1932.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Black BOX Security, INCbbxsecurity.comHQ: Los Angeles, CA, United StatesReported employees: 51-200 | Los Angeles, CA, United States | 51-200 | Exact match | 91 contacts → |
“Black Box Security Inc.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Checkers International INCcheckersinternational.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 69 contacts → |
“Checkers International is a WOC-owned, attorney-led provider of background checks and social media screening services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Palicon Grouppalicongroup.comHQ: Los Angeles, United StatesReported employees: 51-200 | Los Angeles, United States | 51-200 | Exact match | 28 contacts → |
“Palicon Group is a Southern California based firm specializing in workplace investigations, security, and public safety consulting.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  On Watch LLConwatchusa.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 21 contacts → |
“On Watch LLC brings together over 200 years of US military, federal, state, and local law enforcement experience.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Franklin Global, INCfranklinglobal.netHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 16 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 |  Origin Investigations INCorigininvestigations.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 15 contacts → |
“Origin is a private investigation and intelligence agency.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Engel & Engel, LLPengelandengel.comHQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 12 contacts → |
“Engel & Engel has been engaged in the practice of forensic accounting and expert testimony for 30 years.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Thornhill & Associates, INCthornhillandassociates.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 11 contacts → |
“We are Independent Adjusters & Private Investigators, Serving all of California.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Public Interest Investigations, INCpiila.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 10 contacts → |
“Public Interest Investigations is a leading provider of neutral, trauma-informed workplace investigations, Title IX investigations, and criminal investigations for public…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Investigative Consultants ICinvestigativeconsultants.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 10 contacts → |
“Investigative Consultants is an independent, highly skilled, and fully licensed professional investigative company dedicated to “Protecting the Rights of Creative Minds®”.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Nickerson Research, Inc. NRInickersonresearch.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 6 contacts → |
“Nickerson Research, Inc.(NRI) has been finding and clearing information, footage, and photographs for over 30 years (since 1991) and has been 100% woman-owned since the beginning…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Lynx Insights & Investigations, INClynxinsights.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 6 contacts → |
“Lynx Insights is an investigations firm that finds facts in a world of opinions, diversions and misinformation.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Sunset Blvd. Investigations, INCsunsetblvdinv.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 3 contacts → |
“Los Angeles based Sunset Blvd Investigations, Inc, provides investigative services to clients all over the world.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Grutman Law, P.Cgrutmanlaw.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Grutman Law is a woman-owned employment law firm that specializes in conducting independent, legally defensible workplace investigations into complaints of discrimination…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Global Polygraph & Security LLC90210polygraph.comHQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Global Polygraph & Security is a Los Angeles based professional polygraph and investigative services firm specializing in credible, evidence based truth verification for legal…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Andrues Podbereskyaplaw.law HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 20 | Reddock LAW Groupreddocklaw.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Founded by Angela Reddock-Wright in 2011, the Reddock Law Group is a dispute resolution and investigation firm specializing in the resolution of employment and labor law and Title…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Tristar Investigationtristarpi.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 2 contacts → |
“Tristar Investigation is a full-service detective agency with a 28-year track record of delivering first-class investigative results in California and for clients worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  VWM Analyticsjsheld.comHQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 2 contacts → |
“VWM Analytics is now part of J.S.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Covetowercovetower.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Investigative Production Services for the Global Film Industry” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | MSN Forensicsmsnforenzix.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“We redefine modern forensic accounting at MSN Forensics by combining AI-powered technology and decades of investigative expertise.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Dsweiser Legaldsweiserlegal.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 1 contacts → |
“At DSWeiser Legal, our purpose is clear, to help our clients manage risk by conducting thorough, prompt, and impartial workplace and campus investigations.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 61 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
61 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 Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 61 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 Miami60
- Investigation firms in Washington48
- 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 Los Angeles, United States?
The saved snapshot records 61 matching company records, 1,482 tracked contacts and 406 verified emails. The public preview displays 25 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 Miami, United States
- Investigation firms based in New York, United States
Cite this list
RevenueBase Data Team. Top 25 investigation firms based in Los Angeles, United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/investigation-firms/united-states/los-angeles.
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 25 investigation firms based in Los Angeles, United States
RevenueBase records 61 matching company records for investigation firms based in Los Angeles, United States, with 1,482 tracked contacts and 406 verified work emails.
This public preview shows 25 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 25 investigation firms based in Los Angeles, 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 | Professional Security Consultants, INCpscsite.com HQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 626 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Resolution Economicsresecon.com HQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 232 contacts → |
“Founded in 1998, Resolution Economics provides sophisticated economic, statistical, and financial analyses, forensic investigations, forensic technology, dispute advisory, expert…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Marshall & Stevensmarshall-stevens.com HQ: Los Angeles, CA, United StatesReported employees: 201-500 | Los Angeles, CA, United States | 201-500 | Exact match | 137 contacts → |
“Marshall & Stevens has been a leader in the valuation and appraisal industry since its founding in 1932.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Black BOX Security, INCbbxsecurity.com HQ: Los Angeles, CA, United StatesReported employees: 51-200 | Los Angeles, CA, United States | 51-200 | Exact match | 91 contacts → |
“Black Box Security Inc.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Checkers International INCcheckersinternational.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 69 contacts → |
“Checkers International is a WOC-owned, attorney-led provider of background checks and social media screening services.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Palicon Grouppalicongroup.com HQ: Los Angeles, United StatesReported employees: 51-200 | Los Angeles, United States | 51-200 | Exact match | 28 contacts → |
“Palicon Group is a Southern California based firm specializing in workplace investigations, security, and public safety consulting.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | On Watch LLConwatchusa.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 21 contacts → |
“On Watch LLC brings together over 200 years of US military, federal, state, and local law enforcement experience.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Franklin Global, INCfranklinglobal.net HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 16 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 | Origin Investigations INCorigininvestigations.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 15 contacts → |
“Origin is a private investigation and intelligence agency.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Engel & Engel, LLPengelandengel.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 12 contacts → |
“Engel & Engel has been engaged in the practice of forensic accounting and expert testimony for 30 years.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Thornhill & Associates, INCthornhillandassociates.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 11 contacts → |
“We are Independent Adjusters & Private Investigators, Serving all of California.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Public Interest Investigations, INCpiila.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 10 contacts → |
“Public Interest Investigations is a leading provider of neutral, trauma-informed workplace investigations, Title IX investigations, and criminal investigations for public…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Investigative Consultants ICinvestigativeconsultants.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 10 contacts → |
“Investigative Consultants is an independent, highly skilled, and fully licensed professional investigative company dedicated to “Protecting the Rights of Creative Minds®”.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Nickerson Research, Inc. NRInickersonresearch.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 6 contacts → |
“Nickerson Research, Inc.(NRI) has been finding and clearing information, footage, and photographs for over 30 years (since 1991) and has been 100% woman-owned since the beginning…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Lynx Insights & Investigations, INClynxinsights.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 6 contacts → |
“Lynx Insights is an investigations firm that finds facts in a world of opinions, diversions and misinformation.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Sunset Blvd. Investigations, INCsunsetblvdinv.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 3 contacts → |
“Los Angeles based Sunset Blvd Investigations, Inc, provides investigative services to clients all over the world.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Grutman Law, P.Cgrutmanlaw.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Grutman Law is a woman-owned employment law firm that specializes in conducting independent, legally defensible workplace investigations into complaints of discrimination…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Global Polygraph & Security LLC90210polygraph.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Global Polygraph & Security is a Los Angeles based professional polygraph and investigative services firm specializing in credible, evidence based truth verification for legal…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Andrues Podbereskyaplaw.law HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 20 | Reddock LAW Groupreddocklaw.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Founded by Angela Reddock-Wright in 2011, the Reddock Law Group is a dispute resolution and investigation firm specializing in the resolution of employment and labor law and Title…” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Tristar Investigationtristarpi.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 2 contacts → |
“Tristar Investigation is a full-service detective agency with a 28-year track record of delivering first-class investigative results in California and for clients worldwide.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | VWM Analyticsjsheld.com HQ: Los Angeles, CA, United StatesReported employees: 11-50 | Los Angeles, CA, United States | 11-50 | Exact match | 2 contacts → |
“VWM Analytics is now part of J.S.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Covetowercovetower.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“Investigative Production Services for the Global Film Industry” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | MSN Forensicsmsnforenzix.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 2 contacts → |
“We redefine modern forensic accounting at MSN Forensics by combining AI-powered technology and decades of investigative expertise.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Dsweiser Legaldsweiserlegal.com HQ: Los Angeles, CA, United StatesReported employees: 1-10 | Los Angeles, CA, United States | 1-10 | Exact match | 1 contacts → |
“At DSWeiser Legal, our purpose is clear, to help our clients manage risk by conducting thorough, prompt, and impartial workplace and campus investigations.” Recorded description excerpt · September 20, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 61 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
61 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 Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 61 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 Miami60
- Investigation firms in Washington48
- 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 Los Angeles, United States?
The saved snapshot records 61 matching company records, 1,482 tracked contacts and 406 verified emails. The public preview displays 25 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 Miami, United States
- Investigation firms based in New York, United States
Cite this list
RevenueBase Data Team. Top 25 investigation firms based in Los Angeles, United States. Snapshot: September 20, 2026. https://revenuebase.ai/companies/investigation-firms/united-states/los-angeles.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
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- 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