Company lists · Data refreshed September 2026

Top 25 Big 4 law firms based in Luxembourg

Name: Big 4 law firms based in Luxembourg
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 156 companies tracked

RevenueBase identified 156 big 4 law firms headquartered in Luxembourg as of September 2026 and tracks 7,242 professional contacts across them, including 3,280 with verified work emails and 80 with mobile numbers. Luxembourg is the largest hub.

This list covers big 4 law firms headquartered in Luxembourg, 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 23, 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 23, 2026 86% judged on-target in blind review

156Companies

7,242Contacts tracked

3,280Verified emails

80Mobile numbers

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The 25 largest big 4 law firms based in Luxembourg

Ranked by team size

Top 25 of 156 big 4 law firms based in Luxembourg, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big 4 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	PWC Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	1,001-5,000	3,413 contacts →
	Indirect evidence “PwC Luxembourg is the largest professional services firm in Luxembourg with over 3,600 people employed from 90 different countries.” Source: RevenueBase Database · checked Sep 23, 2026
2	Arendt & Medernach	Partial evidence	LuxembourgHQ checked Sep 23, 2026	501-1,000	840 contacts →
	Partial evidence “Arendt & Medernach is the leading independent business law firm in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026
3	BDO Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	501-1,000	600 contacts →
	Indirect evidence “BDO Luxembourg is one of the largest firms of accountants, auditors and consultants in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026
4	Elvinger Hoss Prussen	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	201-500	473 contacts →
	Indirect evidence “Independent in structure and spirit, Elvinger Hoss Prussen guides clients on their most critical Luxembourg legal matters.” Source: RevenueBase Database · checked Sep 23, 2026
5	Atoz Services	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	n/a	234 contacts →
	Indirect evidence “Our story begins in 2004 with the creation of the advisory firm ATOZ Tax Advisers.” Source: RevenueBase Database · checked Sep 23, 2026
6	BSP	Partial evidence	Leudelange, LuxembourgHQ checked Sep 23, 2026	51-200	164 contacts →
	Partial evidence “BSP is an independent full-service law firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026
7	In Extenso Belux	Indirect evidence	Windhof, LuxembourgHQ checked Sep 23, 2026	51-200	124 contacts →
	Indirect evidence “Vous êtes chef d’entreprise, artisan, commerçant, professionnels libéral ou du secteur financier?” Source: RevenueBase Database · checked Sep 23, 2026
8	Kleyr Grasso	Partial evidence	Strassen, LuxembourgHQ checked Sep 23, 2026	51-200	81 contacts →
	Partial evidence “KLEYR_GRASSO is an independent full-service law firm specializing in business law and litigation, serving international and domestic clients for 30 years in Luxembourg with the…” Source: RevenueBase Database · checked Sep 23, 2026
9	DLA Piper In Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	51-200	62 contacts →
	Indirect evidence “Practical and innovative legal advice regarding any transaction either domestic or multi-national.” Source: RevenueBase Database · checked Sep 23, 2026
10	Brucher Thieltgen & Partners	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	52 contacts →
	Indirect evidence “Brucher Thieltgen & Partners, a legal practice established in Luxembourg City at the heart of the international financial centre, is a multidisciplinary boutique firm active in…” Source: RevenueBase Database · checked Sep 23, 2026
11	Baker Mckenzie Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	51-200	46 contacts →
	Indirect evidence “Based in one of the world's most important financial and holding centers, our Luxembourg office advises clients on major cross-border financings, transactions and investment…” Source: RevenueBase Database · checked Sep 23, 2026
12	DSM Avocats À LA Cour	Partial evidence	LuxembourgHQ checked Sep 23, 2026	11-50	40 contacts →
	Partial evidence “DSM Avocats à la Cour, an independent law firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026
13	Simmons & Simmons Luxembourg LLP	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	37 contacts →
	Indirect evidence “Established since 2015 in the Grand Duchy, Simmons & Simmons Luxembourg services the requirements of its clients in the Asset Management & Investment Funds and Financial…” Source: RevenueBase Database · checked Sep 23, 2026
14	Atdomco	Indirect evidence	Luxembourg Luxembourg City, LuxembourgHQ checked Sep 23, 2026	11-50	32 contacts →
	Indirect evidence “Our services aim to meet the complex and sophisticated requests of our Clients looking for business, accounting and tax advice on setting up and maintaining tax and investment…” Source: RevenueBase Database · checked Sep 23, 2026
15	Ts&p	Partial evidence	LuxembourgHQ checked Sep 23, 2026	11-50	30 contacts →
	Partial evidence “TS & P is a boutique law firm providing bespoke high-quality corporate and tax advice, while always considering practical and commercial aspects.” Source: RevenueBase Database · checked Sep 23, 2026
16	Brouxel & Rabia, Luxembourg LAW Firm	Partial evidence	LuxembourgHQ checked Sep 23, 2026	11-50	24 contacts →
	Partial evidence “Brouxel & Rabia Luxembourg Law Firm ("B&R") is an independent business law firm, ventured by two of the most senior and most successful partners in Luxembourg, Samia RABIA &…” Source: RevenueBase Database · checked Sep 23, 2026
17	Schiltz & Schiltz S.A	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	21 contacts →
	Indirect evidence “SCHILTZ & SCHILTZ was initially established in 1932 by Tony Biever, MP.” Source: RevenueBase Database · checked Sep 23, 2026
18	Elvinger US	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	21 contacts →
	Indirect evidence “We have shaped a firm fit for one purpose; to deliver the best possible advice for businesses, institutions and entrepreneurs.” Source: RevenueBase Database · checked Sep 23, 2026
19	Castegnaro	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	21 contacts →
	Indirect evidence “Hautement spécialisé en droit du travail, CASTEGNARO - Ius Laboris Luxembourg est un cabinet d’avocats qui représente exclusivement les entreprises et groupes d’entreprises de…” Source: RevenueBase Database · checked Sep 23, 2026
20	A3t S.A	Indirect evidence	Belvaux, LuxembourgHQ checked Sep 23, 2026	11-50	21 contacts →
	Indirect evidence “We enable clients operating in all sectors to create and manage growth by providing them timely, accurate and prudent advice on audit, accountancy, corporate and financial…” Source: RevenueBase Database · checked Sep 23, 2026
21	Wildgen, Luxembourg LAW Firm	Partial evidence	L-, LuxembourgHQ checked Sep 23, 2026	51-200	20 contacts →
	Partial evidence “Since 1923, WILDGEN has been at the heart of law practice in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026
22	Turk & Prum Avocats À LA Cour	Indirect evidence	LuxembourgHQ checked Sep 23, 2026	11-50	18 contacts →
	Indirect evidence “TURK & PRUM est un cabinet regroupant des avocats au service de la défense et de l’accompagnement de ses clients.” Source: RevenueBase Database · checked Sep 23, 2026
23	Thewes & Reuter	Partial evidence	LuxembourgHQ checked Sep 23, 2026	11-50	15 contacts →
	Partial evidence “THEWES & REUTER is a full service law firm offering advisory and dispute resolution services.” Source: RevenueBase Database · checked Sep 23, 2026
24	Karp & Choucroun LAW Firm	Partial evidence	LuxembourgHQ checked Sep 23, 2026	1-10	14 contacts →
	Partial evidence “Karp & Choucroun with more than 25 years of professional practice, is a law firm established in Luxembourg city, the heart of European Union institutions and international…” Source: RevenueBase Database · checked Sep 23, 2026
25	Fiscogest Sàrl	Indirect evidence	Bascharage, LuxembourgHQ checked Sep 23, 2026	11-50	13 contacts →
	Indirect evidence “La société Fiscogest S.à r.l, créée en 2007, est une équipe de professionnels jeunes et dynamiques vous garantissant un service de confiance personnalisé.” Source: RevenueBase Database · checked Sep 23, 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: big 4 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 big 4 law firms.
Partial evidence: Its own public description names part of big 4 law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big 4 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 156 big 4 law firms based in Luxembourg

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Big 4 law firms based in Luxembourg at a glance

As of Sep 23, 2026

45.3%Verified-email coverage

1.1%Mobile-number coverage

46.4Average contacts per company

1-10Median size (employees)

75.0%Largest-city concentration · Luxembourg

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

2,4750–30

74831–60

4561–90

190–180

11180+

Company record updated

Median 63.0d

00–30

3,21331–60

2,78061–90

83990–180

410180+

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 big 4 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.
What qualifies: Companies headquartered in Luxembourg whose own description of what they do matches “big 4 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 big 4 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 big 4 law firms, and records with no verified work email. Companies headquartered outside Luxembourg 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, 3,280 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 23, 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 big 4 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 big 4 law firms are there based in Luxembourg?

RevenueBase identified 156 big 4 law firms headquartered in Luxembourg 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?

PWC Luxembourg, headquartered in Luxembourg, tops this list with the largest team on record.

Which city has the most big 4 law firms?

Luxembourg leads with 117 headquartered companies, followed by Strassen (4) and Senningerberg (3).

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 3,280 verified decision-maker contacts tracked across these 156 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 23, 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.