Company lists · Data refreshed September 2026

Top 25 Regulatory compliance accounting firms based in the United States

Name: Regulatory compliance accounting 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 29, 2026 1,952 companies tracked

RevenueBase identified 1,952 regulatory compliance accounting firms headquartered in the United States as of September 2026 and tracks 23,518 professional contacts across them, including 9,936 with verified work emails. New York is the largest hub.

This list covers regulatory compliance accounting 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

1,952Companies

23,518Contacts tracked

9,936Verified emails

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The 25 largest regulatory compliance accounting firms based in the United States

Ranked by team size

Top 25 of 1,952 regulatory compliance accounting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to regulatory compliance accounting firms: 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	Donnelley Financial Solutions Dfin	Strong evidence	Lancaster, PA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,740 contacts →
	Strong evidence “DFIN is the leading global provider of compliance and regulatory software and services, fueling end-to-end investment company regulatory compliance needs, complex capital markets…” Source: RevenueBase Database · checked Sep 29, 2026
2	ACA Group	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,486 contacts →
	Partial evidence “ACA Group is the leading governance, risk, and compliance advisor to the financial services industry.” Source: RevenueBase Database · checked Sep 29, 2026
3	Kearney & Company	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 29, 2026	1,001-5,000	999 contacts →
	Partial evidence “Established in 1985, Kearney & Company is the largest Certified Public Accounting (CPA) firm in the country exclusively focused on the government.” Source: RevenueBase Database · checked Sep 29, 2026
4	CT Corporation	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	1,001-5,000	788 contacts →
	Partial evidence “CT Corporation helps small businesses, corporations, and law firms around the world manage their most critical business and legal compliance responsibilities.” Source: RevenueBase Database · checked Sep 29, 2026
5	Solomonedwards	Indirect evidence	Wayne, PA, United StatesHQ checked Sep 29, 2026	1,001-5,000	557 contacts →
	Indirect evidence “For more than 25 years, SolomonEdwards has empowered organizations to tackle common and complex business challenges through strategic advisory, technical advocacy, and hands-on…” Source: RevenueBase Database · checked Sep 29, 2026
6	Aithent INC	Strong evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	416 contacts →
	Strong evidence “Aithent creates high-value regulatory compliance management solutions for financial services, government, healthcare and insurance organizations around the globe.” Source: RevenueBase Database · checked Sep 29, 2026
7	IBM Promontory	Partial evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	501-1,000	403 contacts →
	Partial evidence “IBM Promontory is a global leader in strategy, risk management, and compliance consulting.#IBMConsulting” Source: RevenueBase Database · checked Sep 29, 2026
8	Registrar Corp	Strong evidence	Hampton, VA, United StatesHQ checked Sep 29, 2026	51-200	317 contacts →
	Strong evidence “Registrar Corp is your trusted partner helping you navigate global regulatory requirements with expert services, innovative software solutions and comprehensive online compliance…” Source: RevenueBase Database · checked Sep 29, 2026
9	Comply	Partial evidence	New York City, NY, United StatesHQ checked Sep 29, 2026	201-500	308 contacts →
	Partial evidence “At Comply, we pride ourselves on being the champion for compliance professionals.” Source: RevenueBase Database · checked Sep 29, 2026
10	Lauterbach & Amen	Partial evidence	Naperville, IL, United StatesHQ checked Sep 29, 2026	201-500	223 contacts →
	Partial 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 29, 2026
11	Pease Bell	Partial evidence	Cleveland, OH, United StatesHQ checked Sep 29, 2026	51-200	183 contacts →
	Partial evidence “Pease Bell is a rapidly growing mid-sized accounting firm serving an expanding nationwide client base.” Source: RevenueBase Database · checked Sep 29, 2026
12	Lachman Consultant Services	Strong evidence	Westbury, NY, United StatesHQ checked Sep 29, 2026	51-200	179 contacts →
	Strong evidence “Quality & Compliance \| Regulatory Strategy \| Inspection Readiness & Remediation \| Data Integrity.” Source: RevenueBase Database · checked Sep 29, 2026
13	FI Consulting	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 29, 2026	51-200	179 contacts →
	Indirect evidence “As sweeping changes in regulation, technology, and markets transform the financial sector, high performing organizations know they can’t stay ahead by standing still.” Source: RevenueBase Database · checked Sep 29, 2026
14	Dla, LLC	Indirect evidence	Fairfield, NJ, United StatesHQ checked Sep 29, 2026	201-500	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, 2026
15	Lumsden Mccormick CPA	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 29, 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 29, 2026
16	Harbor Compliance	Partial evidence	Lancaster, PA, United StatesHQ checked Sep 29, 2026	201-500	150 contacts →
	Partial evidence “We provide innovative compliance solutions by embracing complexity and making it simple.” Source: RevenueBase Database · checked Sep 29, 2026
17	Larson & Company	Indirect evidence	Sandy, UT, United StatesHQ checked Sep 29, 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 29, 2026
18	Optima Partners	Strong evidence	NY, United StatesHQ checked Sep 29, 2026	51-200	145 contacts →
	Strong evidence “Established in 2014, Optima is a leading global regulatory compliance and cybersecurity consulting firm advising financial institutions, including investment managers, hedge…” Source: RevenueBase Database · checked Sep 29, 2026
19	Soho Square Solutions	Strong evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	142 contacts →
	Strong evidence “Experts on financial regulatory & compliance, business analysis, project Implementation and delivery for Corporate and Investment Banking, Asset management clients Firm…” Source: RevenueBase Database · checked Sep 29, 2026
20	HCPRO	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	201-500	136 contacts →
	Indirect evidence “HCPro, LLC.” Source: RevenueBase Database · checked Sep 29, 2026
21	Vertical Relevance	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 2026	51-200	129 contacts →
	Indirect 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, 2026
22	Risk & Regulatory Consulting LLC	Partial evidence	Farmington, CT, United StatesHQ checked Sep 29, 2026	51-200	122 contacts →
	Partial evidence “Risk & Regulatory Consulting, LLC is a leading, national professional services firm dedicated to providing exceptional consulting services to insurance regulators.” Source: RevenueBase Database · checked Sep 29, 2026
23	DFP Partners	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	51-200	110 contacts →
	Partial evidence “For over 40 years, DFP Partners has been a committed ally to Broker-Dealers, Registered Investment Advisers, and other financial services firms looking for accounting and…” Source: RevenueBase Database · checked Sep 29, 2026
24	Fiondella, Milone & Lasaracina LLP FML	Partial evidence	Glastonbury, CT, United StatesHQ checked Sep 29, 2026	51-200	109 contacts →
	Partial evidence “FML is unique among mid-size regional accounting firms in that we work differently and offer our clients more in the way of specialized services.” Source: RevenueBase Database · checked Sep 29, 2026
25	Flsv LLP	Strong evidence	Garden City, NY, United StatesHQ checked Sep 29, 2026	51-200	109 contacts →
	Strong evidence “Frankel Loughran Starr & Vallone LLP (FLSV), a premier accounting, tax advisory and compliance firm focused primarily in the financial services industry, was formed in 1995 by…” Source: RevenueBase Database · checked Sep 29, 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: regulatory compliance accounting 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 regulatory compliance accounting firms.
Partial evidence: Its own public description names part of regulatory compliance accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name regulatory compliance accounting 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 1,952 regulatory compliance accounting firms based in the United States

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Regulatory compliance accounting firms based in the United States at a glance

As of Sep 29, 2026

42.2%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

5.9%Largest-city concentration · New York

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

1,235

11-50

550

51-200

122

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 1,952 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 regulatory compliance accounting 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 “regulatory compliance accounting 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 regulatory compliance accounting 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 regulatory compliance accounting 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, 9,936 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.

Regulatory compliance accounting firms by metro

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 regulatory compliance accounting 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 regulatory compliance accounting firms are there based in the United States?

RevenueBase identified 1,952 regulatory compliance accounting 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?

Donnelley Financial Solutions Dfin, headquartered in Lancaster, tops this list with the largest team on record.

Which city has the most regulatory compliance accounting firms?

New York leads with 116 headquartered companies, followed by Houston (46) and Atlanta (41).

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 9,936 verified decision-maker contacts tracked across these 1,952 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.