Company lists · Data refreshed September 2026

Top 25 Verification services worldwide

Name: Verification services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,653 companies tracked

RevenueBase identified 1,653 verification services worldwide as of September 2026 and tracks 45,625 professional contacts across them, including 14,834 with verified work emails. The United States is the largest market and London the largest hub.

This list covers verification services worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026. Country and city lists for verification services follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

1,653Companies

45,625Contacts tracked

14,834Verified emails

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The 25 largest verification services worldwide

Ranked by team size

Top 25 of 1,653 verification services worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to verification services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	First Advantage	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	5,001-10,000	5,000 contacts →
	Indirect evidence “Our Brand Promise Know your people™ In a world shaped by digital transformation, AI, remote work, regulatory complexity, and rising risk, identity is no longer static.” Source: RevenueBase Database · checked Sep 21, 2026
2	Sterling	Indirect evidence	Independence, OH, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,879 contacts →
	Indirect evidence “Sterling was acquired by First Advantage on October 31st, 2024.” Source: RevenueBase Database · checked Sep 21, 2026
3	Accurate Background	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,619 contacts →
	Indirect evidence “In a category of inflexible giants and ill-equipped startups, Accurate Background stands alone.” Source: RevenueBase Database · checked Sep 21, 2026
4	GIS	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,474 contacts →
	Indirect evidence “GIS \| HireRight was established in 1966 and is one of the nation's oldest and largest background screening providers.” Source: RevenueBase Database · checked Sep 21, 2026
5	Authbridge	Strong evidence	Gurugram, IndiaHQ checked Sep 21, 2026	501-1,000	1,369 contacts →
	Strong evidence “AuthBridge is India’s largest Authentication company, delivering cutting-edge technology and alternate data analysis for Identity Management, Onboarding & Verification, and…” Source: RevenueBase Database · checked Sep 21, 2026
6	Dataflow Group	Strong evidence	Dubai, United Arab EmiratesHQ checked Sep 21, 2026	501-1,000	1,332 contacts →
	Strong evidence “DataFlow Group is a pioneering global provider of specialized Primary Source Verification (PSV) solutions, and background screening and immigration compliance services that assist…” Source: RevenueBase Database · checked Sep 21, 2026
7	GBG PLC	Indirect evidence	Chester, TürkiyeHQ checked Sep 21, 2026	1,001-5,000	1,212 contacts →
	Indirect evidence “GBG is the leading expert in global identity and location tech, enabling safe and rewarding digital lives for genuine people, everywhere.” Source: RevenueBase Database · checked Sep 21, 2026
8	id.me	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	961 contacts →
	Indirect evidence “ID.me is the next-generation digital identity wallet that simplifies how individuals securely prove their identity online.” Source: RevenueBase Database · checked Sep 21, 2026
9	Sumsub	Indirect evidence	Limassol, CyprusHQ checked Sep 21, 2026	501-1,000	933 contacts →
	Indirect evidence “Sumsub is the first AI-powered trust infrastructure for compliance operations at scale.” Source: RevenueBase Database · checked Sep 21, 2026
10	IDFY	Indirect evidence	Mumbai, IndiaHQ checked Sep 21, 2026	501-1,000	847 contacts →
	Indirect evidence “IDfy is building the foundational layer of trust for the modern world, providing the essential infrastructure that global businesses, from digital banks to e-commerce giants, rely…” Source: RevenueBase Database · checked Sep 21, 2026
11	Unico ID	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 21, 2026	501-1,000	676 contacts →
	Indirect evidence “Unico is a global identity network that forges trust between people & companies.” Source: RevenueBase Database · checked Sep 21, 2026
12	Cfirst Background Checks LLP	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 21, 2026	201-500	667 contacts →
	Indirect evidence “cFIRST is a digital global background screening service provider headquartered in Cincinnati, Ohio.” Source: RevenueBase Database · checked Sep 21, 2026
13	Veriff	Strong evidence	NY, United StatesHQ checked Sep 21, 2026	201-500	519 contacts →
	Strong evidence “Veriff is the preferred identity verification partner for the world’s biggest and best digital companies, including pioneers in fintech, crypto, gaming and the mobility sectors.” Source: RevenueBase Database · checked Sep 21, 2026
14	Verifacts Services PVT LTD	Strong evidence	Bangalore, IndiaHQ checked Sep 21, 2026	501-1,000	477 contacts →
	Strong evidence “Empowering Confident Hiring Decisions for 15+ Years Verifacts is India’s trusted background verification partner-delivering accurate, customizable checks across employees…” Source: RevenueBase Database · checked Sep 21, 2026
15	Informdata	Indirect evidence	Kennesaw, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	427 contacts →
	Indirect evidence “We connect businesses to verifiable people data so they can reduce risk, move faster, and make confident decisions with clarity and context.” Source: RevenueBase Database · checked Sep 21, 2026
16	PROOF	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	422 contacts →
	Indirect evidence “Proof makes trust possible in a digital world.” Source: RevenueBase Database · checked Sep 21, 2026
17	ACS	Indirect evidence	Pune, IndiaHQ checked Sep 21, 2026	1,001-5,000	420 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
18	IDNOW	Indirect evidence	Munich, GermanyHQ checked Sep 21, 2026	501-1,000	415 contacts →
	Indirect evidence “IDnow is Europe’s leader in digital identity and fraud prevention with a mission to transform trust into the most powerful asset in the digital world, empowering enterprises with…” Source: RevenueBase Database · checked Sep 21, 2026
19	PROVE	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	414 contacts →
	Strong evidence “Prove modernizes how digital trust is established and maintained throughout the digital consumer journey, providing unparalleled accuracy in identity verification and…” Source: RevenueBase Database · checked Sep 21, 2026
20	Sterlingbackcheck	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 21, 2026	1,001-5,000	408 contacts →
	Indirect evidence “Sterling was acquired by First Advantage on October 31st, 2024.” Source: RevenueBase Database · checked Sep 21, 2026
21	Trulioo	Strong evidence	Vancouver, BC, CanadaHQ checked Sep 21, 2026	201-500	387 contacts →
	Strong evidence “Trulioo is the world’s identity platform, trusted by leading companies for their verification and fraud prevention needs.” Source: RevenueBase Database · checked Sep 21, 2026
22	Serve Legal	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	369 contacts →
	Indirect evidence “Are you confident in your business’ compliance standards?” Source: RevenueBase Database · checked Sep 21, 2026
23	CAF	Strong evidence	Venancio Aires, BrazilHQ checked Sep 21, 2026	201-500	339 contacts →
	Strong evidence “CAF is a Brazil-based provider of end-to-end identity verification, proofing and authentication solutions.” Source: RevenueBase Database · checked Sep 21, 2026
24	Vertical Screen, INC	Indirect evidence	Warminster, PA, United KingdomHQ checked Sep 21, 2026	501-1,000	330 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
25	Xactus	Strong evidence	Broomall, PA, United StatesHQ checked Sep 21, 2026	501-1,000	283 contacts →
	Strong evidence “Xactus – a leading fintech specializing in verification solutions for the mortgage and financial services industries – leverages advanced technology and industry expertise to…” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: verification services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names verification services.
Partial evidence: Its own public description names part of verification services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name verification services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,653 verification services worldwide

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Verification services worldwide at a glance

As of Sep 21, 2026

32.5%Verified-email coverage

27.6Average contacts per company

11-50Median size (employees)

2.7%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

723

11-50

583

51-200

232

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among verification services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for verification services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “verification services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names verification services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among verification services, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 14,834 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Verification services by location

7 lists · largest first

Every Verification services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names verification services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many verification services are there worldwide?

RevenueBase identified 1,653 verification services worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

First Advantage, headquartered in Atlanta, tops this list with the largest team on record.

Which country has the most verification services?

The United States leads with 485 companies, followed by India (249) and the United Kingdom (102). Every verification services list by country and city is linked on this page.

Which city has the most verification services?

London leads with 45 headquartered companies, followed by Bengaluru (26) and Bangalore (24).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 14,834 verified decision-maker contacts tracked across these 1,653 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.