Company lists · Data refreshed September 2026
Top 25 IT provider for professional services firms based in the United States
RevenueBase identified 7,676 IT provider for professional services firms headquartered in 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 IT provider for professional services firms headquartered in the United States, 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.
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 IT provider for professional services firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 12,815 contacts → | ||||
Partial evidence “Guidehouse is a global AI-led professional services firm delivering advisory, technology, and managed services to the commercial and government sectors.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 8,779 contacts → | ||||
Indirect evidence “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 6,369 contacts → | ||||
Partial evidence “CBIZ, Inc.(NYSE: CBZ) is a leading professional services advisor to middle-market businesses nationwide.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 3,047 contacts → | ||||
Indirect evidence “Always advancing.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 2,996 contacts → | ||||
Partial evidence “Citrin Cooperman is one of the nation’s largest and fastest-growing professional services firms.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,989 contacts → | ||||
Partial evidence “Founded as an alternative to the status quo, Armanino doesn’t just keep up with change, we embrace it.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 2,035 contacts → | ||||
Partial evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,860 contacts → | ||||
Indirect evidence “Weaver has built a nationwide presence on an unwavering commitment to client success, acting with integrity and always striving to transcend expectations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,688 contacts → | ||||
Partial evidence “Sikich offers the public and private sectors a diverse platform of professional services across consulting, technology, and compliance.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,303 contacts → | ||||
Indirect evidence “Hi there, we're BPM!” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,239 contacts → | ||||
Partial evidence “Neudesic, an IBM Company, is a global professional services firm dedicated to advancing businesses with our Microsoft technology expertise.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,149 contacts → | ||||
Indirect evidence “W3Global is a leading provider of end-to-end consulting services, empowering businesses to achieve their strategic goals and optimize their operations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,056 contacts → | ||||
Indirect evidence “RubinBrown provides unmatched service to closely held and publicly traded companies in specialized market sectors as well as non-profit and public sector organizations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,037 contacts → | ||||
Indirect evidence “Synoptek is a leading global managed services provider and technology consulting firm that delivers transformative business results.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 1,016 contacts → | ||||
Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 909 contacts → | ||||
Partial evidence “Medasource is a leading consulting and professional services firm supporting organizations across the healthcare ecosystem – including Life Sciences, RCM/Payers, Technology…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 870 contacts → | ||||
Partial evidence “Idexcel is a Professional Services and Technology Solutions provider specializing in Cloud Services, Cloud Native Services, Data Platforms and Intelligence, Automation & AI.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 818 contacts → | ||||
Partial evidence “As a leading IT consulting and outsourcing services firm, Buchanan Technologies helps organizations across North America turn their business technology into a powerful competitive…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 799 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 734 contacts → | ||||
Indirect evidence “Connor Group is built for breakthroughs.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 707 contacts → | ||||
Indirect evidence “Sierra-Cedar specializes in meeting sophisticated clients' enterprise information technology needs in higher education, public sector, healthcare, and commercial markets.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 683 contacts → | ||||
Indirect evidence “Clark Schaefer Hackett is more than an accounting and advisory firm; we’re striving to be your most valued advisor.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 655 contacts → | ||||
Indirect evidence “Since AccountantsWorld By IRIS is a leader in providing HR and payroll software for accountants and CPA firms.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 646 contacts → | ||||
Indirect evidence “Ciber Global is now HTC Global Services with effect from November 30, 2021.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 607 contacts → | ||||
Indirect evidence “S&L International, Inc.” Source: RevenueBase Database · checked Sep 21, 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: IT provider for professional 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 IT provider for professional services firms.
- Partial evidence
- Its own public description names part of IT provider for professional services firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name IT provider for professional 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 7,676 IT provider for professional services firms based in the United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 65,717 reachable decision-makers.
Free signup · no credit card
IT provider for professional services firms based in the United States at a glance
As of Sep 21, 2026Companies by employee count
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
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among IT provider for professional 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.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “IT provider for professional 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 IT provider for professional 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 IT provider for professional services firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- 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, 65,717 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.
IT provider for professional services firms by metro
- IT provider for professional services firms in New York240
- IT provider for professional services firms in Atlanta143
- IT provider for professional services firms in Houston143
- IT provider for professional services firms in Chicago130
- IT provider for professional services firms in Dallas106
- IT provider for professional services firms in Austin100
- IT provider for professional services firms in Los Angeles95
- IT provider for professional services firms in Miami80
- IT provider for professional services firms in San Francisco75
- IT provider for professional services firms in Washington73
- IT provider for professional services firms in San Diego65
- IT provider for professional services firms in Boston62
- IT provider for professional services firms in Tampa60
- IT provider for professional services firms in Charlotte58
- IT provider for professional services firms in Denver56
- IT provider for professional services firms in Irvine53
- IT provider for professional services firms in Seattle50
- IT provider for professional services firms in Phoenix49
- IT provider for professional services firms in Irving48
- IT provider for professional services firms in Plano46
- IT provider for professional services firms in Frisco42
- IT provider for professional services firms in Las Vegas41
- IT provider for professional services firms in San Jose38
- IT provider for professional services firms in Orlando37
- IT provider for professional services firms in Alpharetta36
- IT provider for professional services firms in Portland35
- IT provider for professional services firms in Raleigh35
- IT provider for professional services firms in Columbus33
- IT provider for professional services firms in Newark32
- IT provider for professional services firms in Indianapolis31
- IT provider for professional services firms in Philadelphia31
- IT provider for professional services firms in Pittsburgh31
- IT provider for professional services firms in Richmond31
- IT provider for professional services firms in Minneapolis30
- IT provider for professional services firms in Princeton30
- IT provider for professional services firms in Cincinnati29
- IT provider for professional services firms in Bellevue28
- IT provider for professional services firms in Sacramento28
- IT provider for professional services firms in Herndon26
- IT provider for professional services firms in Jacksonville26
- IT provider for professional services firms in Reston26
- IT provider for professional services firms in San Antonio26
- IT provider for professional services firms in Sheridan26
- IT provider for professional services firms in Fort Lauderdale25
- IT provider for professional services firms in Nashville25
- IT provider for professional services firms in Scottsdale25
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 IT provider for professional 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 IT provider for professional services firms are there based in the United States?
RevenueBase identified 7,676 IT provider for professional services firms headquartered in the United States 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?
Guidehouse, headquartered in Mclean, tops this list with the largest team on record.
Which city has the most IT provider for professional services firms?
New York leads with 240 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 65,717 verified decision-maker contacts tracked across these 7,676 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.
Ready to reach these companies? Verified emails and direct dials for all 7,676 IT provider for professional services firms based in the United States. Start with a free account, no credit card.
Download this list →Related lists
IT provider for professional services firms by geography
- IT provider for professional services firms based in Adelaide, Australia
- IT provider for professional services firms based in Brisbane, Australia
- IT provider for professional services firms based in Melbourne, Australia
- IT provider for professional services firms based in Perth, Australia
- IT provider for professional services firms based in Sydney, Australia
- IT provider for professional services firms based in Barueri, Brazil
- IT provider for professional services firms based in Belo Horizonte, Brazil
- IT provider for professional services firms based in Campinas, Brazil
- IT provider for professional services firms based in Curitiba, Brazil
- IT provider for professional services firms based in Porto Alegre, Brazil
- IT provider for professional services firms based in Rio De Janeiro, Brazil
- IT provider for professional services firms based in Sao Paulo, Brazil
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- IT provider for professional services firms based in Adelaide, Australia
- IT provider for professional services firms based in Brisbane, Australia
- IT provider for professional services firms based in Melbourne, Australia
- IT provider for professional services firms based in Perth, Australia
- IT provider for professional services firms based in Sydney, Australia
- IT provider for professional services firms based in Barueri, Brazil