Company lists · Data refreshed September 2026

Top 25 Professional service companies worldwide

Name: Professional service companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 25,915 companies tracked

RevenueBase identified 25,915 company matches for professional service companies worldwide as of September 2026 and tracks 891,361 professional contacts across them, including 311,132 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for professional service companies worldwide, 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. Country and city lists for professional service companies follow the table.

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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 20, 2026 How this list was built

25,915Companies

891,361Contacts tracked

311,132Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest professional service companies worldwide

Ranked by team size

Top 25 of 25,915 company matches for professional service companies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Deloitte	Exact match	United StatesHQ recorded Sep 20, 2026	10001+	480,083 contacts →
	Exact match “Deloitte drives progress.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Kpmg India	Exact match	Gurugram, IndiaHQ recorded Sep 20, 2026	10001+	28,997 contacts →
	Exact match “KPMG entities in India are established under the laws of India and are owned and managed (as the case may be) by established Indian professionals.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	Kpmg Deutschland	Exact match	Berlin, GermanyHQ recorded Sep 20, 2026	10001+	8,886 contacts →
	Exact match “KPMG is a network of professional firms with about employees in 146 countries and territories.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	Protiviti	Exact match	Menlo Park, CA, United StatesHQ recorded Sep 20, 2026	5,001-10,000	8,779 contacts →
	Exact match “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	CBIZ	Exact match	Independence, OH, United StatesHQ recorded Sep 20, 2026	10001+	6,369 contacts →
	Exact match “CBIZ, Inc.(NYSE: CBZ) is a leading professional services advisor to middle-market businesses nationwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	Management Solutions	Exact match	Madrid, SpainHQ recorded Sep 20, 2026	1,001-5,000	4,468 contacts →
	Exact match “Management Solutions is a leading provider of business consulting services for regulated industries.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Eisneramper	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	4,199 contacts →
	Exact match “EisnerAmper, one of the largest business consulting firms in the world, is comprised of EisnerAmper LLP, a licensed independent CPA firm that provides client attest services; and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	PWC Luxembourg	Exact match	LuxembourgHQ recorded Sep 20, 2026	1,001-5,000	3,413 contacts →
	Exact match “PwC Luxembourg is the largest professional services firm in Luxembourg with over 3,600 people employed from 90 different countries.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	In Extenso	Exact match	Lyon, FranceHQ recorded Sep 20, 2026	5,001-10,000	3,278 contacts →
	Exact match “Crée en 1991 In Extenso est l’un des leaders de l’expertise comptable en France.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Citrin Cooperman	Exact match	New York, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,996 contacts →
	Exact match “Citrin Cooperman is one of the nation’s largest and fastest-growing professional services firms.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	PWC Malaysia	Exact match	Kuala Lumpur, MalaysiaHQ recorded Sep 20, 2026	1,001-5,000	2,858 contacts →
	Exact match “At PwC, we measure success by having a positive reputation.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	Uhy-Us	Exact match	New York, NY, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,035 contacts →
	Exact match “UHY is one of the nation’s largest professional services firms providing audit, tax, consulting and advisory services to clients primarily in the dynamic middle market.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	J.S. Held LLC	Exact match	Jericho, NY, PalestineHQ recorded Sep 20, 2026	1,001-5,000	1,954 contacts →
	Exact match “J.S.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	PWC Norway	Exact match	Oslo, NorwayHQ recorded Sep 20, 2026	1,001-5,000	1,824 contacts →
	Exact match “PwC er et ledende globalt kompetansehus som bidrar med kunnskap, innsikt og verdiskapning.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Kpmg Poland	Exact match	Warsaw, PolandHQ recorded Sep 20, 2026	1,001-5,000	1,696 contacts →
	Exact match “KPMG jest globalną organizacją niezależnych firm świadczących profesjonalne usługi z zakresu audytu, doradztwa podatkowego, finansowego, prawnego oraz consultingu.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Sikich	Exact match	Chicago, IL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,688 contacts →
	Exact match “Sikich offers the public and private sectors a diverse platform of professional services across consulting, technology, and compliance.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	JTC Group	Exact match	St Helier, JerseyHQ recorded Sep 20, 2026	1,001-5,000	1,574 contacts →
	Exact match “JTC is a publicly listed, global professional services business with deep expertise in fund, corporate and private client services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	BDO Norge	Exact match	Oslo, NorwayHQ recorded Sep 20, 2026	1,001-5,000	1,530 contacts →
	Exact match “We see great value in having a local presence and roots, factors which enable us to work closely with our clients.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	BDO In Indonesia	Exact match	Jakarta, IndonesiaHQ recorded Sep 20, 2026	501-1,000	1,508 contacts →
	Exact match “BDO is the leading provider of professional services within the mid-tier of our profession.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	RSM Ebner Stolz	Exact match	Stuttgart, GermanyHQ recorded Sep 20, 2026	1,001-5,000	1,442 contacts →
	Exact match “Wollen Sie jemanden, der Sie auch beim Sprung in neue Märkte und bei allen anstehenden Herausforderungen begleitet?” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	EXL Services LTD	Exact match	n/a	n/a	1,373 contacts →
	Exact match “Established in 1994, we provide a blend of business strategy, marketing services, behavioural change and executive coaching services and techniques to help grow the business of…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Rehmann	Exact match	Troy, MI, United StatesHQ recorded Sep 20, 2026	501-1,000	1,323 contacts →
	Exact match “Rehmann is a professional advisory firm that provides accounting and assurance, business solutions and outsourcing, specialized consulting, and wealth management services.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	Knights	Exact match	Newcastle-under-lyme, United KingdomHQ recorded Sep 20, 2026	1,001-5,000	1,322 contacts →
	Exact match “We're the business people turn to for professional services everywhere across the UK.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	BPM LLP	Exact match	San Francisco, CA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,303 contacts →
	Exact match “Hi there, we're BPM!” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	Mallette	Exact match	Québec, QC, CanadaHQ recorded Sep 20, 2026	1,001-5,000	1,268 contacts →
	Exact match “Mallette compte plus de 40 bureaux solidement implantés dans plusieurs régions du Québec et regroupe plus de 1 600 ressources œuvrant dans différents secteurs d’activité.” 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 “professional service companies”. 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 25,915 professional service companies worldwide

See the full list, filter by size, metro and specialty, and access 311,132 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Professional service companies worldwide at a glance

As of Sep 20, 2026

34.9%Verified-email coverage

34.4Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · Sao Paulo

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

14,559

11-50

8,621

51-200

1,920

201-500

402

501-1,000

122

1,001-5,000

113

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for professional service companies are linked below.
What qualifies: Company records worldwide whose business descriptions match “professional service companies” 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. 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 311,132 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.

Professional service companies by location

111 lists · largest first

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

Countries

Cities

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 “professional service companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many professional service companies are there worldwide?

RevenueBase identified 25,915 company matches for professional service companies worldwide 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?

Deloitte tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most professional service companies?

The United States leads with 2,819 companies, followed by Brazil (2,235) and India (1,724). Every professional service companies list by country and city is linked on this page.

Which city has the most professional service companies?

Sao Paulo leads with 505 company records, followed by London (278) and Paris (276).

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 311,132 professional contacts with verified work emails tracked across these 25,915 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 25,915 professional service companies worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.