Company lists · Data refreshed September 2026

Top 25 Regulatory compliance law firms based in the United States

RevenueBase identified 1,639 regulatory compliance law firms headquartered in the United States as of September 2026 and tracks 33,391 professional contacts across them, including 19,001 with verified work emails and 17,329 with mobile numbers. New York is the largest hub.

This list covers regulatory compliance law 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
1,639Companies
33,391Contacts tracked
19,001Verified emails
17,329Mobile numbers
Explore all 1,639 companies → Free signup · no credit card · 500 free credits

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

Ranked by team size
Top 25 of 1,639 regulatory compliance law firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names regulatory compliance law firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
Arnold & PorterPartial evidence
Washington, DC, United StatesHQ checked Sep 5, 20261,001-5,0002,333

“Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues.”

Source: company website · checked Sep 5, 2026
2
Dechert LLPPartial evidence
Philadelphia, PA, United StatesHQ checked Sep 5, 20261,001-5,0002,041

“Dechert is the law firm that helps business leaders lead.”

Source: company website · checked Sep 5, 2026
3Columbia, SC, United StatesHQ checked Sep 5, 20261,001-5,0002,012

“Established in 1897, Nelson Mullins is an Am Law 100 firm of more than attorneys, policy advisors and professionals with 33 offices in 17 states and Washington, D.C.”

Source: company website · checked Sep 5, 2026
4
Venable LLPStrong evidence
Washington, DC, United StatesHQ checked Sep 5, 20261,001-5,0001,790

“Committed to Your Success – As a law firm of more than 900 professionals, Venable delivers legal services globally in every area of regulatory compliance, government affairs…”

Source: company website · checked Sep 5, 2026
5
Ballard Spahr LLPPartial evidence
Philadelphia, PA, United StatesHQ checked Sep 5, 20261,001-5,0001,682

“Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.”

Source: company website · checked Sep 5, 2026
6
Clark Hill LAWIndirect evidence
Detroit, MI, United StatesHQ checked Sep 5, 20261,001-5,0001,343

“At Clark Hill, our value proposition is simple.”

Source: company website · checked Sep 5, 2026
7Pittsburgh, PA, United StatesHQ checked Sep 5, 2026501-1,0001,197

“Buchanan Ingersoll & Rooney is a national law firm with a proven reputation for providing progressive, industry-leading legal, business, regulatory and government relations advice…”

Source: company website · checked Sep 5, 2026
8
Hinshaw & Culbertson LLPPartial evidence
Chicago, IL, United StatesHQ checked Sep 5, 2026501-1,0001,188

“Hinshaw & Culbertson LLP is a U.S-based law firm with offices nationwide.”

Source: company website · checked Sep 5, 2026
9Denver, CO, United StatesHQ checked Sep 5, 2026501-1,000902

“For decades, we’ve positioned ourselves at the intersection of law, business and policy to bring a multidisciplinary strategy to every issue.”

Source: company website · checked Sep 5, 2026
10
Hall Booth Smith, P.CPartial evidence
Atlanta, GA, United StatesHQ checked Sep 5, 2026501-1,000815

“Established in 1989, Hall Booth Smith, P.C.(HBS) is a full-service law firm with 33 offices across the United States.”

Source: company website · checked Sep 5, 2026
11
CT CorporationStrong evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,000788

“CT Corporation helps small businesses, corporations, and law firms around the world manage their most critical business and legal compliance responsibilities.”

Source: company website · checked Sep 5, 2026
12
Fordharrison LLPPartial evidence
Atlanta, GA, United StatesHQ checked Sep 5, 2026201-500746

“FordHarrison LLP - your partner in employment law.”

Source: company website · checked Sep 5, 2026
13
Kelley Drye & Warren LLPPartial evidence
New York, NY, United StatesHQ checked Sep 5, 2026501-1,000690

“Kelley Drye is an AmLaw 200 law firm of more than 350 lawyers and other professionals practicing in New York, NY; Washington, D.C; Chicago, IL; Houston, TX, Los Angeles, CA; San…”

Source: company website · checked Sep 5, 2026
14Charlotte, NC, United StatesHQ checked Sep 5, 2026501-1,000584

“Businesses and local governments turn to Parker Poe to structure transactions, navigate regulations, and resolve disputes.”

Source: company website · checked Sep 5, 2026
15
Wiley Rein LLPIndirect evidence
Washington, DC, United StatesHQ checked Sep 5, 2026501-1,000576

“Founded in 1983, Wiley is a dominant presence in the nation’s capital.”

Source: company website · checked Sep 5, 2026
16
Stites & Harbison, PllcPartial evidence
Louisville, KY, United StatesHQ checked Sep 5, 2026201-500426

“A full-service law firm representing clients across the United States and internationally, Stites & Harbison, PLLC is known as a preeminent firm managing sophisticated…”

Source: company website · checked Sep 5, 2026
17
Post & Schell, P.CIndirect evidence
Philadelphia, PA, United StatesHQ checked Sep 5, 2026201-500336

“For over 50 years, Post & Schell’s attorneys have combined the operational knowledge and insight into the industries they represent with creative legal solutions – and helped…”

Source: company website · checked Sep 5, 2026
18
ComplyPartial evidence
New York City, NY, United StatesHQ checked Sep 5, 2026201-500308

“At Comply, we pride ourselves on being the champion for compliance professionals.”

Source: company website · checked Sep 5, 2026
19
Mcnees Wallace & NurickPartial evidence
Harrisburg, PA, United StatesHQ checked Sep 5, 2026201-500307

“Since 1935, McNees Wallace & Nurick has been a trusted, client-focused law firm delivering practical, results-driven legal solutions to businesses, individuals, and organizations.”

Source: company website · checked Sep 5, 2026
20
Keller And Heckman LLPStrong evidence
Washington, DC, United StatesHQ checked Sep 5, 202651-200230

“Keller and Heckman, founded in 1962, has a broad practice in the areas of regulatory law, public policy, and litigation, serving both domestic and international clients.”

Source: company website · checked Sep 5, 2026
21
Mullen Coughlin LLCIndirect evidence
Devon, PA, United StatesHQ checked Sep 5, 2026201-500213

“Founded by John F.”

Source: company website · checked Sep 5, 2026
22
Babst CallandIndirect evidence
Pittsburgh, PA, United StatesHQ checked Sep 5, 202651-200192

“As a collaborative and integrated group of attorneys, we work as a unified team, not as sole practitioners.”

Source: company website · checked Sep 5, 2026
23
Complyright, INCPartial evidence
Pompano Beach, FL, United StatesHQ checked Sep 5, 2026201-500190

“At ComplyRight®, our mission is to empower employers by simplifying the complex world of employment law.”

Source: company website · checked Sep 5, 2026
24
Smith Currie Oles LLPIndirect evidence
Atlanta, GA, United StatesHQ checked Sep 5, 202651-200184

“Smith Currie Oles (SCO) provides comprehensive legal services to all parts of the construction industry.”

Source: company website · checked Sep 5, 2026
25
Harbor CompliancePartial evidence
Lancaster, PA, United StatesHQ checked Sep 5, 2026201-500150

“We provide innovative compliance solutions by embracing complexity and making it simple.”

Source: company website · checked Sep 5, 2026

Showing 25 of 1,639 regulatory compliance law firms based in the United States

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

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 108 HQs
17,329Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
1,146
11-50
381
51-200
76
201-500
16
501-1,000
9
1,001-5,000
9

Verified emails by last verification

0–30
17,760
31–60
1,141
61–90
8
90–180
6
180+
86

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 law firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 law firms”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among regulatory compliance law 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 an evidence 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, 19,001 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 5, 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

How many regulatory compliance law firms are there based in the United States?

RevenueBase identified 1,639 regulatory compliance law 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?

Arnold & Porter, headquartered in Washington, tops this list with the largest team on record.

Which city has the most regulatory compliance law firms?

New York leads with 108 headquartered companies, followed by Washington (106) and Miami (40).

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 19,001 verified decision-maker contacts tracked across these 1,639 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 5, 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.