Company lists · Data refreshed September 2026

Top 25 International law firms based in Luxembourg

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 132 companies tracked

RevenueBase identified 132 international law firms headquartered in Luxembourg as of September 2026 and tracks 5,183 professional contacts across them, including 1,924 with verified work emails and 107 with mobile numbers. Luxembourg is the largest hub.

This list covers international 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 4, 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 4, 2026 86% judged on-target in blind review

132Companies

5,183Contacts tracked

1,924Verified emails

107Mobile numbers

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The 25 largest international law firms based in Luxembourg

Ranked by team size

Top 25 of 132 international law firms based in Luxembourg, ranked by team size, largest first. Data refreshed Sep 4, 2026. RevenueBase Smart Search rates how each company's information relates to international 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	Arendt & Medernach	Partial evidence	LuxembourgHQ checked Sep 4, 2026	501-1,000	848 contacts →
	Partial evidence “Arendt & Medernach is the leading independent business law firm in Luxembourg.” Source: RevenueBase Database · checked Sep 4, 2026
2	BSP	Partial evidence	Leudelange, LuxembourgHQ checked Sep 4, 2026	51-200	162 contacts →
	Partial evidence “BSP is an independent full-service law firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 4, 2026
3	Kleyr Grasso	Strong evidence	Strassen, LuxembourgHQ checked Sep 4, 2026	51-200	81 contacts →
	Strong 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 4, 2026
4	DLA Piper In Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	51-200	63 contacts →
	Indirect evidence “Practical and innovative legal advice regarding any transaction either domestic or multi-national.” Source: RevenueBase Database · checked Sep 4, 2026
5	Brucher Thieltgen & Partners	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	53 contacts →
	Partial 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 4, 2026
6	Baker Mckenzie Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 4, 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 4, 2026
7	DSM Avocats À LA Cour	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	41 contacts →
	Partial evidence “DSM Avocats à la Cour, an independent law firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 4, 2026
8	Simmons & Simmons Luxembourg LLP	Indirect evidence	LuxembourgHQ checked Sep 4, 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 4, 2026
9	Brouxel & Rabia, Luxembourg LAW Firm	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	22 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 4, 2026
10	Schiltz & Schiltz S.A	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	11-50	21 contacts →
	Indirect evidence “SCHILTZ & SCHILTZ was initially established in 1932 by Tony Biever, MP.” Source: RevenueBase Database · checked Sep 4, 2026
11	Castegnaro	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	11-50	20 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 4, 2026
12	Bonn & Schmitt	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	20 contacts →
	Partial evidence “Bonn & Schmitt is a leading Luxembourg law firm.” Source: RevenueBase Database · checked Sep 4, 2026
13	Wildgen, Luxembourg LAW Firm	Partial evidence	LuxembourgHQ checked Sep 4, 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 4, 2026
14	Turk & Prum Avocats À LA Cour	Indirect evidence	LuxembourgHQ checked Sep 4, 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 4, 2026
15	Thewes & Reuter	Partial evidence	LuxembourgHQ checked Sep 4, 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 4, 2026
16	CM LAW	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	13 contacts →
	Partial evidence “At CM Law, we offer more than just legal expertise – we provide a long-term and cost-efficient relationship tailored to your needs.” Source: RevenueBase Database · checked Sep 4, 2026
17	Martin Condrotte Luxembourg LAW Firm	Indirect evidence	Bertrange, LuxembourgHQ checked Sep 4, 2026	11-50	12 contacts →
	Indirect evidence “Cabinet indépendant” Source: RevenueBase Database · checked Sep 4, 2026
18	Karp & Choucroun LAW Firm	Strong evidence	LuxembourgHQ checked Sep 4, 2026	1-10	12 contacts →
	Strong 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 4, 2026
19	Chevalier & Sciales	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	11-50	11 contacts →
	Indirect evidence “Founded in 2005, Chevalier & Sciales, a Luxembourg firm, specialises in: Investment Management: We assist in setting up and operating UCITS and AIFs (RAIFs, SCSp and SIFs)…” Source: RevenueBase Database · checked Sep 4, 2026
20	LEX Thielen & Partners	Partial evidence	LuxembourgHQ checked Sep 4, 2026	11-50	10 contacts →
	Partial evidence “Lex Thielen & Partners is an independent boutique law firm based in Luxembourg, specialized in commercial and civil matters (dispute resolution and advisory).” Source: RevenueBase Database · checked Sep 4, 2026
21	Lutgen Associes	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	1-10	10 contacts →
	Indirect evidence “Notre étude est une étude d’avocats indépendante solidement ancrée à Luxembourg et offrant des services juridiques de contentieux et de conseil.” Source: RevenueBase Database · checked Sep 4, 2026
22	MNKS	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	51-200	10 contacts →
	Indirect evidence “MNKS is a top-tier highly reputable firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 4, 2026
23	Vandenbulke	Partial evidence	LuxembourgHQ checked Sep 4, 2026	1-10	10 contacts →
	Partial evidence “VANDENBULKE is an independent law firm specialising in two core practices: corporate and M&A and banking & finance.” Source: RevenueBase Database · checked Sep 4, 2026
24	Adam & Bleser	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	11-50	9 contacts →
	Indirect evidence “L’étude ADAM & BLESER a été fondée en 1997.” Source: RevenueBase Database · checked Sep 4, 2026
25	Dupont Partners	Indirect evidence	LuxembourgHQ checked Sep 4, 2026	11-50	9 contacts →
	Indirect evidence “Dupont Partners serve as a critical partner to plan and execute its clients’ strategies and objectives.” Source: RevenueBase Database · checked Sep 4, 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: international 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 international law firms.
Partial evidence: Its own public description names part of international law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name international 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 132 international law firms based in Luxembourg

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International law firms based in Luxembourg at a glance

As of Sep 4, 2026

37.1%Verified-email coverage

2.1%Mobile-number coverage

39.3Average contacts per company

1-10Median size (employees)

79.5%Largest-city concentration · Luxembourg

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

00–30

19131–60

95561–90

71090–180

68180+

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 international 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 “international 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 international 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 international 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, 1,924 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 4, 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.

International law firms by metro

International law firms in Luxembourg105

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 international 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 international law firms are there based in Luxembourg?

RevenueBase identified 132 international 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?

Arendt & Medernach, headquartered in Luxembourg, tops this list with the largest team on record.

Which city has the most international law firms?

Luxembourg leads with 105 headquartered companies, followed by Esch-Sur-Alzette (4) and Strassen (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 1,924 verified decision-maker contacts tracked across these 132 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 4, 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.