Company lists · Data refreshed September 2026
Top 25 Attestation services firms worldwide
RevenueBase identified 474 attestation services firms worldwide as of September 2026 and tracks 3,568 professional contacts across them, including 912 with verified work emails. The United States is the largest market and Dubai the largest hub.
This list covers attestation services firms 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 19, 2026. Country and city lists for attestation services firms 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.
The 25 largest attestation services firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 184 contacts → | ||||
Indirect evidence “Auditing, Accounting and Taxation It’s been 100 years since David Strachan strode from the pavement of Smith Street into William Cotta Building at number 331, and put up his…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 117 contacts → | ||||
Indirect evidence “Talenz Audit accompagne les acteurs économiques, entreprises et organisations, dans leurs relations économiques, dans l’analyse de la fiabilité de leurs données financières, et…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 100 contacts → | ||||
Indirect evidence “Doeren Mayhew" is the brand name under which Doeren Mayhew Assurance and Doeren Mayhew Advisors, LLC and its subsidiary entities provide professional services.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 97 contacts → | ||||
Indirect evidence “S G C O & Co.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 92 contacts → | ||||
Indirect evidence “Dallaire Forest Kirouac (DFK) est un cabinet d’expert(e)s‑comptables offrant des services de certification, comptabilité, fiscalité, juricomptabilité, d’évaluation d’entreprise et…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 76 contacts → | ||||
Indirect evidence “Jesteśmy dynamicznie rozwijającą się Kancelarią Biegłych Rewidentów, założoną w 2010 roku.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 59 contacts → | ||||
Strong evidence “PAAST (Perez-Abreu, Aguerrebere, Sueiro & Torres, PL) is a public accounting firm offering a full-line of services, including accounting, attestation, tax, financial due…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 59 contacts → | ||||
Indirect evidence “Lockhat Incorporated is a firm of registered auditors offering a range of financial services to both corporate business and government.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 49 contacts → | ||||
Indirect evidence “Kudos Georgia is an independent audit, accounting, valuation, tax advisory and corporate finance firm based in Tbilisi, Georgia.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 40 contacts → | ||||
Indirect evidence “Parmi les leaders régionaux, notre activité est organisée autour de deux grands métiers - un métier d’expert-comptable généraliste dont l’expérience est reconnue pour la variété…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 40 contacts → | ||||
Strong evidence “Spott, Lucey & Wall is a boutique CPA firm providing a full range of taxation and attestation services.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 40 contacts → | ||||
Indirect evidence “PKF Audit & Conseil est devenu un cabinet indépendant et un membre du réseau PKF International depuis 2018.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 38 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 34 contacts → | ||||
Indirect evidence “Die GAR Gesellschaft für Aufsichtsrecht und Revision mbH Wirtschaftsprüfungsgesellschaft mit Sitz in Frankfurt am Main wurde im Juli 2009 gegründet.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 31 contacts → | ||||
Indirect evidence “Linford & Company LLP is a Denver-based Certified Public Accounting firm comprised of former “Big Four” auditors and Information Security experts.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 23 contacts → | ||||
Indirect evidence “McBride, Lock & Associates, LLC was formed in 1980.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 22 contacts → | ||||
Indirect evidence “Want a local and independent auditing company with personal service, so ask us!” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 21 contacts → | ||||
Indirect evidence “Réseau de professionnels de l'audit financiers.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 19 contacts → | ||||
Indirect evidence “MARTINI & Associés est un cabinet d’expertise comptable et de commissariat aux comptes basé à Rouen.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 18 contacts → | ||||
Indirect evidence “Griffin & Furman, LLC is a full-service CPA firm with offices in Covington, West Monroe, and Baton Rouge, Louisiana.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 18 contacts → | ||||
Indirect evidence “A VGA Auditores Independentes é uma empresa com mais de 47 anos de experiência na prestação de serviços de Auditoria, Lei de Informática, Auditoria em Projetos PRONAS e PRONON…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 18 contacts → | ||||
Indirect evidence “Olemme pohjoiskarjalainen tilintarkastusyhteisö ja olemme alueellisesti suurin itsenäinen toimija.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 17 contacts → | ||||
Indirect evidence “Certified Public Accountants & Advisors” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 17 contacts → | ||||
Indirect evidence “Prestamos serviços com responsabilidade, ética, comprometimento e respeito aos nossos clientes temos soluções para o seu negócio, seja para empresas de micro, pequeno ou grande…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 16 contacts → | ||||
Indirect evidence “KC Audit provides high-quality audits that facilitate economic growth and strengthen trust and transparency for stakeholders.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: attestation services firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names attestation services firms.
- Partial evidence
- Its own public description names part of attestation services firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name attestation services firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 474 attestation services firms worldwide
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Attestation services firms worldwide at a glance
As of Sep 19, 2026Companies by employee count
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 attestation services firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for attestation services firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “attestation services firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names attestation services firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among attestation services firms, 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, 912 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 19, 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.
Attestation services firms by location
1 lists · largest firstEvery Attestation services firms 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 attestation services firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many attestation services firms are there worldwide?
RevenueBase identified 474 attestation services firms 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?
PKF Durban, headquartered in Umhlanga, tops this list with the largest team on record.
Which country has the most attestation services firms?
The United States leads with 57 companies. Every attestation services firms list by country and city is linked on this page.
Which city has the most attestation services firms?
Dubai leads with 16 headquartered companies, followed by Paris (11) and Sao Paulo (9).
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 912 verified decision-maker contacts tracked across these 474 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 19, 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.