Company lists · Data refreshed September 2026

Top 25 Audit and assurance service providers based in the United States

Name: Audit and assurance service providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 590 companies tracked

RevenueBase identified 590 audit and assurance service providers headquartered in the United States as of September 2026 and tracks 18,633 professional contacts across them, including 9,034 with verified work emails. New York is the largest hub.

This list covers audit and assurance service providers 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 19, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

590Companies

18,633Contacts tracked

9,034Verified emails

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The 25 largest audit and assurance service providers based in the United States

Ranked by team size

Top 25 of 590 audit and assurance service providers based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to audit and assurance service providers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Carr, Riggs & Ingram	Indirect evidence	Enterprise, AL, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,102 contacts →
	Indirect evidence “Carr, Riggs & Ingram (CRI) is a Top 25 nationally-ranked accounting and advisory firm driven by relationships to cultivate growth.” Source: RevenueBase Database · checked Sep 19, 2026
2	Sikich	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,688 contacts →
	Indirect evidence “Sikich offers the public and private sectors a diverse platform of professional services across consulting, technology, and compliance.” Source: RevenueBase Database · checked Sep 19, 2026
3	Dean Dorton	Partial evidence	Lexington, KY, United StatesHQ checked Sep 19, 2026	501-1,000	590 contacts →
	Partial evidence “Dean Dorton provides an integrated suite of audit, tax, business management, consulting, and technology solutions.” Source: RevenueBase Database · checked Sep 19, 2026
4	Grant Thornton LLP US	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	505 contacts →
	Indirect evidence “Forget what you think you know about professional services.” Source: RevenueBase Database · checked Sep 19, 2026
5	Prager Metis Cpas	Indirect evidence	New York, United StatesHQ checked Sep 19, 2026	201-500	467 contacts →
	Indirect evidence “Prager Metis CPAs is an independent, full service, public accounting and consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
6	GRF Cpas & Advisors	Strong evidence	Bethesda, MD, United StatesHQ checked Sep 19, 2026	51-200	243 contacts →
	Strong evidence “Headquartered in the Washington, DC metropolitan region, GRF CPAs & Advisors (GRF) is a full-service professional services firm providing clients with audit and assurance, tax…” Source: RevenueBase Database · checked Sep 19, 2026
7	Lauterbach & Amen	Indirect evidence	Naperville, IL, United StatesHQ checked Sep 19, 2026	201-500	223 contacts →
	Indirect evidence “Lauterbach & Amen, LLP (L&A), established in 1997 by partners Sherry Lauterbach and Ron Amen, is a reputable public accounting firm known for its unwavering dedication to quality…” Source: RevenueBase Database · checked Sep 19, 2026
8	CKH Group	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	51-200	219 contacts →
	Partial evidence “CKH Group is an Atlanta-headquarterd CPA firm offering powerful assurance, tax, accounting, and advisory services to individuals, small businesses, global enterprises, and…” Source: RevenueBase Database · checked Sep 19, 2026
9	Harding, Shymanski & Company, P.S.C	Indirect evidence	Evansville, IN, United StatesHQ checked Sep 19, 2026	51-200	200 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
10	Hannis T. Bourgeois, LLP	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 19, 2026	51-200	193 contacts →
	Indirect evidence “Established in 1924, Hannis T.” Source: RevenueBase Database · checked Sep 19, 2026
11	Hawkins ASH Cpas	Indirect evidence	La Crosse, WI, United StatesHQ checked Sep 19, 2026	51-200	193 contacts →
	Indirect evidence “Hawkins Ash CPAs, an Inside Public Accounting Top 200 firm, provides certified public accounting services to privately held businesses, governmental organizations, nonprofit…” Source: RevenueBase Database · checked Sep 19, 2026
12	Pease Bell	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 19, 2026	51-200	183 contacts →
	Indirect evidence “Pease Bell is a rapidly growing mid-sized accounting firm serving an expanding nationwide client base.” Source: RevenueBase Database · checked Sep 19, 2026
13	Legacy Professionals LLP	Indirect evidence	Westchester, IL, United StatesHQ checked Sep 19, 2026	51-200	174 contacts →
	Indirect evidence “Legacy Professionals LLP, headquartered in Westchester, IL, with offices in Schererville, IN, and Edina, MN, is a Certified Public Accounting firm serving clients nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
14	THF Thomas Howell Ferguson	Indirect evidence	Tallahassee, FL, United StatesHQ checked Sep 19, 2026	51-200	163 contacts →
	Indirect evidence “Thomas Howell Ferguson P.A.” Source: RevenueBase Database · checked Sep 19, 2026
15	Melton & Melton, LLP	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	157 contacts →
	Partial evidence “Melton & Melton is an independent, Houston-based public accounting firm with diverse audit, tax and client accounting practices.” Source: RevenueBase Database · checked Sep 19, 2026
16	SB & Company, LLC	Partial evidence	Owings Mills, MD, United StatesHQ checked Sep 19, 2026	51-200	156 contacts →
	Partial evidence “SB & Company, LLC (SBC) is an audit, tax, risk consulting and business advisory firm that is an outstanding place where highly talented people help our clients succeed.” Source: RevenueBase Database · checked Sep 19, 2026
17	Lumsden Mccormick CPA	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 19, 2026	51-200	151 contacts →
	Indirect evidence “Lumsden McCormick CPA is located in the newly renovated Cyclorama Building in downtown Buffalo.” Source: RevenueBase Database · checked Sep 19, 2026
18	Larson & Company	Indirect evidence	Sandy, UT, United StatesHQ checked Sep 19, 2026	51-200	147 contacts →
	Indirect evidence “Since 1975, Larson & Company has served the insurance industry with personalized services tailored to a highly regulated industry.” Source: RevenueBase Database · checked Sep 19, 2026
19	Pattillo, Brown & Hill, LLP	Indirect evidence	Waco, TX, United StatesHQ checked Sep 19, 2026	51-200	142 contacts →
	Indirect evidence “Pattillo, Brown & Hill, L.L.P has been pace setter within the Waco, Texas community since its inauguration in 1923 and continues to be one of the oldest and most respected…” Source: RevenueBase Database · checked Sep 19, 2026
20	Whittlesey	Indirect evidence	Hartford, CT, United StatesHQ checked Sep 19, 2026	51-200	139 contacts →
	Indirect evidence “Founded in Hartford in 1961, Whittlesey is a prominent regional, independent accounting firm recognized for its excellence and commitment to client service.” Source: RevenueBase Database · checked Sep 19, 2026
21	Maher Duessel	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 19, 2026	51-200	135 contacts →
	Partial evidence “Maher Duessel is a leading regional CPA firm that was founded to provide high-caliber audit, tax, and consulting services to clients in the governmental and non-profit sectors.” Source: RevenueBase Database · checked Sep 19, 2026
22	Castro & Company	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 19, 2026	51-200	135 contacts →
	Partial evidence “Castro & Company is an audit, advisory, and IT services CPA Firm specializing in providing the full resources and quality expected from a larger CPA firm while not compromising in…” Source: RevenueBase Database · checked Sep 19, 2026
23	Cotton	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 19, 2026	201-500	134 contacts →
	Partial evidence “Cotton is an audit and accounting firm located in Old Town Alexandria, VA.” Source: RevenueBase Database · checked Sep 19, 2026
24	Reid Accountants Advisors	Indirect evidence	Woodbury, NY, United StatesHQ checked Sep 19, 2026	51-200	133 contacts →
	Indirect evidence “Reid Accountants + Advisors” is the brand name under which Reid CPAs, LLP and Reid Tax & Advisory Services, LLC and its subsidiary entities provide professional services.” Source: RevenueBase Database · checked Sep 19, 2026
25	Draffin Tucker	Indirect evidence	Albany, GA, United StatesHQ checked Sep 19, 2026	51-200	129 contacts →
	Indirect evidence “Since 1948, Draffin & Tucker has supplied a full range of professional accounting services to small businesses, large corporations, individuals, government entities, nonprofit…” Source: RevenueBase Database · checked Sep 19, 2026

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: audit and assurance service providers. 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 audit and assurance service providers.
Partial evidence: Its own public description names part of audit and assurance service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name audit and assurance service providers. 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 590 audit and assurance service providers based in the United States

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Audit and assurance service providers based in the United States at a glance

As of Sep 19, 2026

48.5%Verified-email coverage

31.6Average contacts per company

11-50Median size (employees)

4.1%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

224

11-50

253

51-200

201-500

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 590 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 audit and assurance service providers, 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 “audit and assurance service providers”. 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 audit and assurance service providers), 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 audit and assurance service providers, 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, 9,034 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.

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 audit and assurance service providers, 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 audit and assurance service providers are there based in the United States?

RevenueBase identified 590 audit and assurance service providers 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?

Carr, Riggs & Ingram, headquartered in Enterprise, tops this list with the largest team on record.

Which city has the most audit and assurance service providers?

New York leads with 24 headquartered companies, followed by Houston (18) and Chicago (12).

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 9,034 verified decision-maker contacts tracked across these 590 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.