Company lists · Data refreshed September 2026

Top 25 IT provider for professional services firms based in the United States

Name: IT provider for professional services firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 7,676 companies tracked

RevenueBase identified 7,676 company matches for IT provider for professional services firms associated with the United States as of September 2026 and tracks 181,247 professional contacts across them, including 65,717 with verified work emails. New York is the largest hub.

This list covers company matches for IT provider for professional services firms associated with the 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 21, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 21, 2026 How this list was built

7,676Companies

181,247Contacts tracked

65,717Verified emails

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The 25 largest IT provider for professional services firms based in the United States

Ranked by team size

Top 25 of 7,676 company matches for IT provider for professional services firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Guidehouse	Exact match	Mclean, VA, United StatesHQ recorded Sep 21, 2026	10001+	12,815 contacts →
	Exact match “Guidehouse is a global AI-led professional services firm delivering advisory, technology, and managed services to the commercial and government sectors.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Protiviti	Exact match	Menlo Park, CA, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
3	CBIZ	Exact match	Independence, OH, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
4	Wipfli	Exact match	Milwaukee, WI, United StatesHQ recorded Sep 21, 2026	1,001-5,000	3,047 contacts →
	Exact match “Always advancing.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Citrin Cooperman	Exact match	New York, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
6	Armanino	Exact match	San Ramon, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,989 contacts →
	Exact match “Founded as an alternative to the status quo, Armanino doesn’t just keep up with change, we embrace it.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Uhy-Us	Exact match	New York, NY, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
8	Weaver	Exact match	Houston, TX, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,860 contacts →
	Exact match “Weaver has built a nationwide presence on an unwavering commitment to client success, acting with integrity and always striving to transcend expectations.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Sikich	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
10	BPM LLP	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,303 contacts →
	Exact match “Hi there, we're BPM!” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Neudesic, An IBM Company	Exact match	Irvine, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,239 contacts →
	Exact match “Neudesic, an IBM Company, is a global professional services firm dedicated to advancing businesses with our Microsoft technology expertise.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	W3global	Exact match	Frisco, TX, United StatesHQ recorded Sep 21, 2026	501-1,000	1,149 contacts →
	Exact match “W3Global is a leading provider of end-to-end consulting services, empowering businesses to achieve their strategic goals and optimize their operations.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Rubinbrown LLP	Exact match	St. Louis, MO, United StatesHQ recorded Sep 21, 2026	501-1,000	1,056 contacts →
	Exact match “RubinBrown provides unmatched service to closely held and publicly traded companies in specialized market sectors as well as non-profit and public sector organizations.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Synoptek	Exact match	Costa Mesa, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,037 contacts →
	Exact match “Synoptek is a leading global managed services provider and technology consulting firm that delivers transformative business results.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Cohen & CO	Exact match	Cleveland, OH, United StatesHQ recorded Sep 21, 2026	501-1,000	1,016 contacts →
	Exact match “Founded in 1977, Cohen & Co is one of America’s Most Recommended Tax and Accounting Firms by USA TODAY and serves a broad range of clients, from privately held companies and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Medasource	Exact match	Indianapolis, IN, United StatesHQ recorded Sep 21, 2026	501-1,000	909 contacts →
	Exact match “Medasource is a leading consulting and professional services firm supporting organizations across the healthcare ecosystem – including Life Sciences, RCM/Payers, Technology…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Idexcel	Exact match	Herndon, VA, United StatesHQ recorded Sep 21, 2026	501-1,000	870 contacts →
	Exact match “Idexcel is a Professional Services and Technology Solutions provider specializing in Cloud Services, Cloud Native Services, Data Platforms and Intelligence, Automation & AI.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Buchanan Technologies	Exact match	Grapevine, TX, United StatesHQ recorded Sep 21, 2026	501-1,000	818 contacts →
	Exact match “As a leading IT consulting and outsourcing services firm, Buchanan Technologies helps organizations across North America turn their business technology into a powerful competitive…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Frazier & Deeter	Exact match	Atlanta, GA, United StatesHQ recorded Sep 21, 2026	501-1,000	799 contacts →
	Exact match “Frazier & Deeter (FD) is an award-winning professional services firm, comprised of Frazier & Deeter, LLC, a US licensed CPA firm that provides attest services to its clients, and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Connor Group	Exact match	Santa Clara, CA, United StatesHQ recorded Sep 21, 2026	501-1,000	734 contacts →
	Exact match “Connor Group is built for breakthroughs.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Sierra-Cedar	Exact match	Alpharetta, GA, United StatesHQ recorded Sep 21, 2026	501-1,000	707 contacts →
	Exact match “Sierra-Cedar specializes in meeting sophisticated clients' enterprise information technology needs in higher education, public sector, healthcare, and commercial markets.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Clark Schaefer Hackett	Exact match	Dayton, OH, United StatesHQ recorded Sep 21, 2026	501-1,000	683 contacts →
	Exact match “Clark Schaefer Hackett is more than an accounting and advisory firm; we’re striving to be your most valued advisor.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Accountantsworld By Iris	Exact match	Hauppauge, NY, United StatesHQ recorded Sep 21, 2026	n/a	655 contacts →
	Exact match “Since AccountantsWorld By IRIS is a leader in providing HR and payroll software for accountants and CPA firms.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Ciber Global	Exact match	Troy, MI, United StatesHQ recorded Sep 21, 2026	5,001-10,000	646 contacts →
	Exact match “Ciber Global is now HTC Global Services with effect from November 30, 2021.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	S & L International	Exact match	Arcadia, CA, United StatesHQ recorded Sep 21, 2026	n/a	607 contacts →
	Exact match “S&L International, Inc.” Recorded in the RevenueBase company graph · Sep 21, 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 “IT provider for professional services 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 7,676 IT provider for professional services firms based in the United States

See the full list, filter by size, metro and specialty, and access 65,717 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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IT provider for professional services firms based in the United States at a glance

As of Sep 21, 2026

36.3%Verified-email coverage

23.6Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

4,064

11-50

2,415

51-200

861

201-500

182

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 7,676 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 the United States whose business descriptions match “IT provider for professional services 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 65,717 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 21, 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.

IT provider for professional services firms by metro

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 “IT provider for professional services firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many IT provider for professional services firms are there based in the United States?

RevenueBase identified 7,676 company matches for IT provider for professional services firms associated with the 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?

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

Which city has the most IT provider for professional services firms?

New York leads with 252 company records, followed by Atlanta (143) and Houston (143).

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 65,717 professional contacts with verified work emails tracked across these 7,676 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 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 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.