Company lists · Data refreshed September 2026
Top 25 Taxonomy consulting firms based in the United States
RevenueBase identified 320 taxonomy consulting firms headquartered in the United States as of September 2026 and tracks 17,554 professional contacts across them, including 7,798 with verified work emails. New York is the largest hub.
This list covers taxonomy consulting 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 29, 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 taxonomy consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 8,779 contacts → | ||||
Partial 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 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 675 contacts → | ||||
Partial evidence “Uniqus Consultech is an AI and global tech-enabled consulting company that specializes in Accounting & Reporting Consulting, Governance, Risk & Compliance, Sustainability &…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 322 contacts → | ||||
Partial evidence “Drummond Advisors provides global consulting services to companies focusing on accounting, tax, legal and business development.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 236 contacts → | ||||
Indirect evidence “Zen & Art is a group of talented and experienced technologists and business practitioners who recognize the need for a simplistic approach amidst mass disruption.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 231 contacts → | ||||
Indirect evidence “eTeam Sirius Solutions L.L.C.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 212 contacts → | ||||
Indirect evidence “Founded in 1931, Kerber, Eck & Braeckel LLP (KEB) is a mid-sized firm of certified public accountants and management consultants with eight offices in three Midwestern states.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 202 contacts → | ||||
Indirect evidence “ASL works with emerging and middle market privately held businesses to help them thrive in their markets, and with high net worth individuals, such as owners, founders and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 198 contacts → | ||||
Indirect evidence “Bold steps forward.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 191 contacts → | ||||
Partial evidence “Research Nester is a global consulting firm that works with the most aspirational facilitators to define the future market strategies.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 187 contacts → | ||||
Partial evidence “Hutchinson and Bloodgood LLP is a leading firm of Certified Public Accountants and Consultants providing Tax Planning, Auditing, Technology Consulting, Human Resources and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 179 contacts → | ||||
Indirect evidence “Stambaugh Ness is a professional services firm serving clients nationally with a singular focus on architecture, engineering, and related industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 165 contacts → | ||||
Indirect evidence “DLA, LLC is a leading consultancy firm that provides a wide range of specialized services designed to optimize business operations and drive sustainable growth.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 158 contacts → | ||||
Partial evidence “EFPR, a Springline company, is one of Western New York’s largest accounting and business consulting firms serving clients across the United States and around the globe.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 133 contacts → | ||||
Partial evidence “Haskell & White LLP is one of the largest independently owned accounting, auditing and tax consulting firms in Southern California, specializing in servicing public and private…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 133 contacts → | ||||
Indirect evidence “Olsen Thielen & Co, Ltd.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 129 contacts → | ||||
Partial evidence “Vertical Relevance is an industry-focused consulting firm with deep expertise in financial services and additional regulated industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 106 contacts → | ||||
Partial evidence “Kassouf & Company is a public accounting and consulting firm practicing in the areas of tax, assurance, financial services, business consulting, litigation support, wealth…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 105 contacts → | ||||
Partial evidence “We are now part of WSP, a world leading, multi-disciplinary consulting firm.#BecomingWSP #WeAreWSP” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 99 contacts → | ||||
Indirect evidence “Walter Shuffain is known for its commitment to helping private businesses and the affluent reach their ideals in the Boston and New England area.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 96 contacts → | ||||
Indirect evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 92 contacts → | ||||
Partial evidence “HCJ CPAs and Advisors provides knowledgeable auditing, tax and business consulting services that companies need in today’s business climate.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 90 contacts → | ||||
Indirect evidence “ARB guides organizations in the automotive, construction, manufacturing, and nonprofit sectors; closely held businesses; and family groups to make intelligent, sensible financial…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 73 contacts → | ||||
Partial evidence “Founded in 1987, CJBS is one of the leading accounting and consulting firms in the Chicago area and a trusted community partner.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 73 contacts → | ||||
Indirect evidence “For almost 40 years, Cg Tax, Audit & Advisory (“Cg”) has helped clients stay focused on the road ahead™ by maximizing savings, increasing profitability and achieving financial…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 56 contacts → | ||||
Partial evidence “Skeo Solutions is a small business providing environmental consulting services.” Source: RevenueBase Database · checked Sep 29, 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: taxonomy consulting 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 taxonomy consulting firms.
- Partial evidence
- Its own public description names part of taxonomy consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name taxonomy consulting 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 320 taxonomy consulting firms based in the United States
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Taxonomy consulting firms based in the United States at a glance
As of Sep 29, 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 320 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 taxonomy consulting 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 “taxonomy consulting 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 taxonomy consulting 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 taxonomy consulting 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, 7,798 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 29, 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.
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 taxonomy consulting 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 taxonomy consulting firms are there based in the United States?
RevenueBase identified 320 taxonomy consulting 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?
Protiviti, headquartered in Menlo Park, tops this list with the largest team on record.
Which city has the most taxonomy consulting firms?
New York leads with 22 headquartered companies, followed by Houston (9) and Washington (7).
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 7,798 verified decision-maker contacts tracked across these 320 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 29, 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.
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