Company lists · Data refreshed September 2026
Top 23 International business law firms based in Luxembourg
RevenueBase identified 155 international business law firms headquartered in Luxembourg as of September 2026 and tracks 5,485 professional contacts across them, including 2,113 with verified work emails and 109 with mobile numbers. Luxembourg is the largest hub.
This list covers international business 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, how directly it supports the match, 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 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.
The 23 largest international business law firms based in Luxembourg
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 848 | ||||
“Arendt & Medernach is the leading independent business law firm in Luxembourg.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 162 | ||||
“BSP is an independent full-service law firm based in Luxembourg.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 81 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 63 | ||||
“Practical and innovative legal advice regarding any transaction either domestic or multi-national.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 53 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 46 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 41 | ||||
“DSM Avocats à la Cour, an independent law firm based in Luxembourg.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | 37 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 30 | ||||
“TS & P is a boutique law firm providing bespoke high-quality corporate and tax advice, while always considering practical and commercial aspects.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 22 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 21 | ||||
“SCHILTZ & SCHILTZ was initially established in 1932 by Tony Biever, MP.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | 20 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 20 | ||||
“Bonn & Schmitt is a leading Luxembourg law firm.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 20 | ||||
“Since 1923, WILDGEN has been at the heart of law practice in Luxembourg.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 18 | ||||
“TURK & PRUM est un cabinet regroupant des avocats au service de la défense et de l’accompagnement de ses clients.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 15 | ||||
“THEWES & REUTER is a full service law firm offering advisory and dispute resolution services.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 13 | ||||
“At CM Law, we offer more than just legal expertise – we provide a long-term and cost-efficient relationship tailored to your needs.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 12 | ||||
“Cabinet indépendant” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | 12 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | 11 | ||||
“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: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 10 | ||||
“B.A.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 | ||||
“Lex Thielen & Partners is an independent boutique law firm based in Luxembourg, specialized in commercial and civil matters (dispute resolution and advisory).” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 10 | ||||
“Notre étude est une étude d’avocats indépendante solidement ancrée à Luxembourg et offrant des services juridiques de contentieux et de conseil.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 23 of 155 international business law firms based in Luxembourg
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International business law firms based in Luxembourg at a glance
As of Sep 4, 2026Companies by employee count
Verified emails by last verification
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 business 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 Luxembourg whose own description of what they do matches “international business 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 international business 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 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, 2,113 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 business law firms by metro
- International business law firms in Luxembourg125
Frequently asked
How many international business law firms are there based in Luxembourg?
RevenueBase identified 155 international business 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 business law firms?
Luxembourg leads with 125 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 2,113 verified decision-maker contacts tracked across these 155 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 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.
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