Company lists · Data refreshed September 2026

Top 25 Union compliance law firms worldwide

Name: Union compliance law firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 31,370 companies tracked

RevenueBase identified 31,370 union compliance law firms worldwide as of September 2026 and tracks 349,759 professional contacts across them, including 156,170 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers union compliance law firms worldwide, 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. Country and city lists for union compliance law firms follow the table.

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

31,370Companies

349,759Contacts tracked

156,170Verified emails

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The 25 largest union compliance law firms worldwide

Ranked by team size

Top 25 of 31,370 union compliance law firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to union compliance law 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	Lewis Brisbois	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	3,079 contacts →
	Partial evidence “Established in 1979, Lewis Brisbois Bisgaard & Smith LLP is a national, full-service law firm with more than 1,600 attorneys and 54 offices in 30 states and the District of…” Source: RevenueBase Database · checked Sep 29, 2026
2	Ogletree Deakins	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,708 contacts →
	Partial evidence “Ogletree Deakins is one of the largest labor and employment law firms representing management in all types of employment-related legal matters.” Source: RevenueBase Database · checked Sep 29, 2026
3	Littler	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,555 contacts →
	Partial evidence “Littler is the largest global employment and labor law practice, representing management in all aspects of employment and labor law and serving as a single-source solution…” Source: RevenueBase Database · checked Sep 29, 2026
4	Husch Blackwell	Partial evidence	20+ U.s. Offices, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,539 contacts →
	Partial evidence “Husch Blackwell is a different kind of law firm–structured around our clients’ industries and built on a culture of selfless service.” Source: RevenueBase Database · checked Sep 29, 2026
5	Arnold & Porter	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,333 contacts →
	Indirect evidence “Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues.” Source: RevenueBase Database · checked Sep 29, 2026
6	Jackson Lewis P.C	Partial evidence	New York, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,285 contacts →
	Partial evidence “Focused on employment and labor law since 1958, Jackson Lewis P.C.’s attorneys located in major cities nationwide consistently identify and respond to new ways workplace law…” Source: RevenueBase Database · checked Sep 29, 2026
7	Dechert LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,041 contacts →
	Partial evidence “Dechert is the law firm that helps business leaders lead.” Source: RevenueBase Database · checked Sep 29, 2026
8	Nelson Mullins Riley & Scarborough	Partial evidence	Columbia, SC, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,012 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 29, 2026
9	Taft Stettinius & Hollister LLP	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,980 contacts →
	Indirect evidence “At Taft, we work as one team, driven and committed to helping you succeed.” Source: RevenueBase Database · checked Sep 29, 2026
10	Venable LLP	Strong evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,790 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 29, 2026
11	Clayton UTZ	Partial evidence	Sydney, AustraliaHQ checked Sep 29, 2026	1,001-5,000	1,787 contacts →
	Partial evidence “We are one of Australia's oldest and largest law firms, with offices in six cities, nearly 200 partners, and a full range of legal services for large private sector and government…” Source: RevenueBase Database · checked Sep 29, 2026
12	Dinsmore & Shohl LLP	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,720 contacts →
	Indirect evidence “Dinsmore & Shohl LLP has a nationwide team of more than 750 attorneys who are trusted advisers to Fortune 500 companies, institutions, associations, governments, professional…” Source: RevenueBase Database · checked Sep 29, 2026
13	Ballard Spahr LLP	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,682 contacts →
	Partial evidence “Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.” Source: RevenueBase Database · checked Sep 29, 2026
14	Tozzinifreire Advogados	Partial evidence	São Paulo, BrazilHQ checked Sep 29, 2026	1,001-5,000	1,580 contacts →
	Partial evidence “TozziniFreire is one of the leading legal services organizations in Latin America, operating in all areas of Business Law and with a significant track record in serving national…” Source: RevenueBase Database · checked Sep 29, 2026
15	Blake, Cassels & Graydon LLP	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 29, 2026	1,001-5,000	1,555 contacts →
	Indirect evidence “At Blake, Cassels & Graydon LLP (Blakes), we serve a diverse national and international client base.” Source: RevenueBase Database · checked Sep 29, 2026
16	Fisher Phillips	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	501-1,000	1,471 contacts →
	Indirect evidence “With hundreds of attorneys across the globe, Fisher Phillips advises and advocates for employers internationally on some of the most complex and high-profile workplace matters.” Source: RevenueBase Database · checked Sep 29, 2026
17	KIM & Chang	Partial evidence	Sajik-ro 8-gil, South KoreaHQ checked Sep 29, 2026	1,001-5,000	1,451 contacts →
	Partial evidence “Kim & Chang is a globally recognized law firm based in Korea.” Source: RevenueBase Database · checked Sep 29, 2026
18	Clark Hill LAW	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,343 contacts →
	Indirect evidence “At Clark Hill, our value proposition is simple.” Source: RevenueBase Database · checked Sep 29, 2026
19	Quarles & Brady LLP	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,318 contacts →
	Indirect evidence “For over 125 years, Quarles & Brady LLP has provided quality legal services to a wide range of industries on a national stage.” Source: RevenueBase Database · checked Sep 29, 2026
20	Snell & Wilmer	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 29, 2026	501-1,000	1,219 contacts →
	Partial evidence “Founded in 1938, Snell & Wilmer is a full-service business law firm with more than 500 lawyers practicing in 17 locations throughout the United States and in Mexico.” Source: RevenueBase Database · checked Sep 29, 2026
21	Steptoe LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,207 contacts →
	Indirect evidence “In more than 100 years of practice, Steptoe* has earned an international reputation for vigorous representation of clients before governmental agencies, successful advocacy in…” Source: RevenueBase Database · checked Sep 29, 2026
22	Jenner & Block	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	501-1,000	1,194 contacts →
	Indirect evidence “At Jenner & Block, we shape what’s next through experience, vision, and judgment.” Source: RevenueBase Database · checked Sep 29, 2026
23	Hinshaw & Culbertson LLP	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	501-1,000	1,188 contacts →
	Partial evidence “Hinshaw & Culbertson LLP is a U.S-based law firm with offices nationwide.” Source: RevenueBase Database · checked Sep 29, 2026
24	Stinson LLP	Indirect evidence	500 Attorneys. 17 Locations Nationwide., MN, United StatesHQ checked Sep 29, 2026	501-1,000	1,167 contacts →
	Indirect evidence “Stinson LLP collaborates with clients ranging from individuals and privately held enterprises to national companies and international public corporations.” Source: RevenueBase Database · checked Sep 29, 2026
25	Taylor Rose	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1,001-5,000	1,155 contacts →
	Partial evidence “Taylor Rose is a top 60 independent law firm with 1,700 experts operating nationwide and is recommended by the Legal 500 UK.” 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: union compliance law 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 union compliance law firms.
Partial evidence: Its own public description names part of union compliance law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name union compliance law 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 31,370 union compliance law firms worldwide

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Union compliance law firms worldwide at a glance

As of Sep 29, 2026

44.7%Verified-email coverage

11.1Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

21,579

11-50

7,827

51-200

1,392

201-500

220

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 union compliance law 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.
Coverage: Every country. Country and city lists for union compliance law firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “union compliance law 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 union compliance law 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 union compliance law firms, and records with no verified work email.
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, 156,170 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.

Union compliance law firms by location

161 lists · largest first

Every Union compliance law firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 union compliance law 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 union compliance law firms are there worldwide?

RevenueBase identified 31,370 union compliance law firms worldwide 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?

Lewis Brisbois, headquartered in Los Angeles, tops this list with the largest team on record.

Which country has the most union compliance law firms?

The United States leads with 8,871 companies, followed by Brazil (5,670) and Spain (1,318). Every union compliance law firms list by country and city is linked on this page.

Which city has the most union compliance law firms?

Sao Paulo leads with 1151 headquartered companies, followed by Paris (534) and New York (446).

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 156,170 verified decision-maker contacts tracked across these 31,370 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.