Company lists · Data refreshed September 2026

Top 25 Energy tax law firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 6,058 companies tracked

RevenueBase identified 6,058 energy tax law firms worldwide as of September 2026 and tracks 72,871 professional contacts across them, including 28,797 with verified work emails. Brazil is the largest market and Sao Paulo the largest hub.

This list covers energy tax 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 28, 2026. Country and city lists for energy tax 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 28, 2026 86% judged on-target in blind review

6,058Companies

72,871Contacts tracked

28,797Verified emails

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The 25 largest energy tax law firms worldwide

Ranked by team size

Top 25 of 6,058 energy tax law firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to energy tax 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	A&o Shearman	Partial evidence	Hamburg, United KingdomHQ checked Sep 28, 2026	5,001-10,000	6,574 contacts →
	Partial evidence “A&O Shearman transforms the way law is practiced, to deliver unparalleled results for our clients' most complex matters – everywhere in the world.” Source: RevenueBase Database · checked Sep 28, 2026
2	Garrigues	Strong evidence	Madrid, SpainHQ checked Sep 28, 2026	1,001-5,000	2,853 contacts →
	Strong evidence “Garrigues is an international legal and tax services firm that advises clients locally, regionally and globally from every angle of business law.” Source: RevenueBase Database · checked Sep 28, 2026
3	Haynes And Boone, LLP	Strong evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,558 contacts →
	Strong evidence “Haynes Boone is among the fastest-growing firms in the Am Law 100, providing full-service counsel across sectors, including corporate, energy, financial services, real estate…” Source: RevenueBase Database · checked Sep 28, 2026
4	Watson Farley & Williams	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,331 contacts →
	Strong evidence “Watson Farley & Williams is a leading international law firm advising clients operating in the energy, infrastructure and transport sectors.” Source: RevenueBase Database · checked Sep 28, 2026
5	Buchanan Ingersoll & Rooney PC	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 28, 2026	501-1,000	1,197 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
6	Shakespeare Martineau	Partial evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	1,001-5,000	989 contacts →
	Partial evidence “Shakespeare Martineau is a leading law firm that brings creativity, commerciality and clarity to complex challenges.” Source: RevenueBase Database · checked Sep 28, 2026
7	Stoel Rives LLP	Indirect evidence	Portland, OR, United StatesHQ checked Sep 28, 2026	501-1,000	864 contacts →
	Indirect evidence “Stoel Rives is a leading U.S.” Source: RevenueBase Database · checked Sep 28, 2026
8	Luther Rechtsanwaltsgesellschaft MBH	Strong evidence	Köln, GermanyHQ checked Sep 28, 2026	501-1,000	831 contacts →
	Strong evidence “Luther is a leading German commercial law firm that offers comprehensive legal and tax services.” Source: RevenueBase Database · checked Sep 28, 2026
9	Steptoe & Johnson Pllc	Strong evidence	Bridgeport, WV, United StatesHQ checked Sep 28, 2026	501-1,000	757 contacts →
	Strong evidence “Steptoe & Johnson PLLC is a law firm nationally recognized for its strengths in energy law with more than a century of know-how in the areas of business, employment, and…” Source: RevenueBase Database · checked Sep 28, 2026
10	EY Société D'avocats	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	501-1,000	735 contacts →
	Indirect evidence “EY Société d’avocats se mobilise pour concrétiser les potentiels: c’est ainsi que nous faisons la différence pour nos clients, nos équipes et tous nos interlocuteurs.” Source: RevenueBase Database · checked Sep 28, 2026
11	Deloitte Société D'avocats	Strong evidence	Paris La Défense, FranceHQ checked Sep 28, 2026	501-1,000	690 contacts →
	Strong evidence “Deloitte Société d'Avocats is one of the leading French law firms, specializing in international tax and legal strategies.” Source: RevenueBase Database · checked Sep 28, 2026
12	Chevez Ruiz Zamarripa	Indirect evidence	Ciudad De Mexico, MexicoHQ checked Sep 28, 2026	501-1,000	683 contacts →
	Indirect evidence “Chevez Ruiz Zamarripa, es una firma especializada en la Asesoría y Consultoría Fiscal de alto nivel, que se distingue por prestar servicios personalizados con total…” Source: RevenueBase Database · checked Sep 28, 2026
13	Kpmg Avocats	Indirect evidence	Courbevoie, FranceHQ checked Sep 28, 2026	501-1,000	669 contacts →
	Indirect evidence “Les entreprises de toutes tailles sont exposées à des dispositions de plus en plus complexes en matière de réglementations fiscales et juridiques sur leur territoire national et…” Source: RevenueBase Database · checked Sep 28, 2026
14	Bond, Schoeneck & King Pllc	Partial evidence	Syracuse, NY, United StatesHQ checked Sep 28, 2026	201-500	581 contacts →
	Partial evidence “Bond is a full-service law firm counseling individuals, companies, not-for-profits and public sector entities in a wide spectrum of practice areas.” Source: RevenueBase Database · checked Sep 28, 2026
15	Advant Nctm	Indirect evidence	Milano, ItalyHQ checked Sep 28, 2026	201-500	514 contacts →
	Indirect evidence “Fondato nel ADVANT Nctm è uno studio legale indipendente con oltre 360 avvocati e dottori commercialisti, uno dei principali in Italia.” Source: RevenueBase Database · checked Sep 28, 2026
16	William FRY LLP	Strong evidence	Dublin, IrelandHQ checked Sep 28, 2026	201-500	507 contacts →
	Strong evidence “As one of Ireland's largest law firms, William Fry LLP offers unrivalled legal and tax expertise across the full breadth of the business sector.” Source: RevenueBase Database · checked Sep 28, 2026
17	Morgan & Morgan	Partial evidence	Costa Del Este, PanamaHQ checked Sep 28, 2026	501-1,000	484 contacts →
	Partial evidence “Morgan & Morgan is a full-service Panamanian law firm, regularly assisting local and multinational corporations from different industries, as well as recognized financial…” Source: RevenueBase Database · checked Sep 28, 2026
18	Balch & Bingham LLP	Partial evidence	Birmingham, AL, United StatesHQ checked Sep 28, 2026	201-500	472 contacts →
	Partial evidence “Balch & Bingham LLP is a full-service corporate law firm recognized nationally for its genuine dedication to its clients, forward-thinking approach, and ability to anticipate what…” Source: RevenueBase Database · checked Sep 28, 2026
19	Kean Miller	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 28, 2026	201-500	452 contacts →
	Indirect evidence “Just as oil and gas must be refined to unlock their true potential, we at Kean Miller continuously optimize our legal approach to help transform business complexities into new…” Source: RevenueBase Database · checked Sep 28, 2026
20	Mcafee & Taft	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 28, 2026	201-500	403 contacts →
	Partial evidence “By rigorously maintaining the highest standards of legal excellence, the Oklahoma-based law firm of McAfee & Taft has grown to become one of the largest and most respected…” Source: RevenueBase Database · checked Sep 28, 2026
21	Parsons Behle & Latimer	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 28, 2026	201-500	381 contacts →
	Indirect evidence “Parsons Behle & Latimer offers the resources and capabilities of a large and diverse firm, coupled with the highest levels of accessibility and responsiveness.” Source: RevenueBase Database · checked Sep 28, 2026
22	Guyer & Regules	Partial evidence	Montevideo, UruguayHQ checked Sep 28, 2026	201-500	337 contacts →
	Partial evidence “Guyer & Regules is proud to be considered as Uruguay’s first choice for international and domestic complex legal, accounting and tax work.” Source: RevenueBase Database · checked Sep 28, 2026
23	Thompson & Knight LLP	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	501-1,000	327 contacts →
	Indirect evidence “Thompson & Knight is now known as Holland & Knight.” Source: RevenueBase Database · checked Sep 28, 2026
24	Pierce Atwood LLP	Partial evidence	Portland, ME, United StatesHQ checked Sep 28, 2026	201-500	320 contacts →
	Partial evidence “Pierce Atwood LLP, a highly-regarded, full-service law firm based in New England, has 150 attorneys who serve regional, national, and international clients from offices in…” Source: RevenueBase Database · checked Sep 28, 2026
25	Chugh, LLP	Strong evidence	Cerritos, CA, United StatesHQ checked Sep 28, 2026	501-1,000	294 contacts →
	Strong evidence “Chugh, LLP is a full-service law and tax firm with offices in Los Angeles, Santa Clara, San Diego, and Newark in CA, Edison, NJ, Atlanta, GA, Herndon, VA, New York, NY, Brentwood…” Source: RevenueBase Database · checked Sep 28, 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: energy tax 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 energy tax law firms.
Partial evidence: Its own public description names part of energy tax law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy tax 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 6,058 energy tax law firms worldwide

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Energy tax law firms worldwide at a glance

As of Sep 28, 2026

39.5%Verified-email coverage

12.0Average contacts per company

1-10Median size (employees)

4.4%Largest-city concentration · Sao Paulo

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

3,690

11-50

1,926

51-200

305

201-500

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 energy tax 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 energy tax law firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “energy tax 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 energy tax 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 energy tax 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, 28,797 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 28, 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.

Energy tax law firms by location

41 lists · largest first

Every Energy tax 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 energy tax 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 energy tax law firms are there worldwide?

RevenueBase identified 6,058 energy tax 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?

A&o Shearman, headquartered in Hamburg, tops this list with the largest team on record.

Which country has the most energy tax law firms?

Brazil leads with 1,086 companies, followed by Germany (824) and the United States (665). Every energy tax law firms list by country and city is linked on this page.

Which city has the most energy tax law firms?

Sao Paulo leads with 268 headquartered companies, followed by Paris (156) and Madrid (91).

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 28,797 verified decision-maker contacts tracked across these 6,058 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 28, 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.