Company lists · Data refreshed September 2026
Top 25 Big 5 law firms based in Luxembourg
RevenueBase identified 62 big 5 law firms headquartered in Luxembourg as of September 2026 and tracks 577 professional contacts across them, including 232 with verified work emails and 6 with mobile numbers. Luxembourg is the largest hub.
This list covers big 5 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.
The 25 largest big 5 law firms based in Luxembourg
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 21 contacts → | ||||
Indirect evidence “SCHILTZ & SCHILTZ was initially established in 1932 by Tony Biever, MP.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 20 contacts → | ||||
Partial evidence “Since 1923, WILDGEN has been at the heart of law practice in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 15 contacts → | ||||
Partial evidence “THEWES & REUTER is a full service law firm offering advisory and dispute resolution services.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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, 2026Thanks. The Data Team will review it. | |||||
| 10 | 13 contacts → | ||||
Partial evidence “Bonn & Schmitt is a leading Luxembourg law firm.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 11 | 12 contacts → | ||||
Indirect evidence “Cabinet indépendant” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 12 | 11 contacts → | ||||
Indirect evidence “Founded in 2005, Chevalier & Sciales is celebrating 20 years of advising clients on Luxembourg's most sophisticated investment, corporate and private wealth matters.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 14 | 10 contacts → | ||||
Indirect evidence “MNKS is a top-tier highly reputable firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 16 | 9 contacts → | ||||
Indirect evidence “Our Luxembourg office is long established and highly regarded, thanks to our resilient ethos of client care and our commitment to build strong and long-term partnerships.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 23, 2026Thanks. The Data Team will review it. | |||||
| 18 | 8 contacts → | ||||
Partial evidence “Patent42 is a law firm acting in Intellectual Property (IP) matters including patents, trademarks and designs.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 19 | 8 contacts → | ||||
Indirect evidence “Créée en 2014, JuRiDex, Avocats à la Cour est une étude d’avocats dédiée au contentieux d'affaires ainsi qu'à la création et au conseil des petites et moyennes entreprises.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 20 | 7 contacts → | ||||
Indirect evidence “The premier luxembourg IP & IT lawfirm.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 contacts → | ||||
Partial evidence “B&F Avocats is an independent law firm based in Luxembourg.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 contacts → | ||||
Indirect evidence “Nous sommes pour nos clients une équipe rapprochée pluridisciplinaire, joignable et disponible qui inscrit son action au cœur et dans l’instant du besoin.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 contacts → | ||||
Partial evidence “Unalome Legal is a Luxembourg boutique law firm providing expert legal advice in employment law and litigation services to entrepreneurs, local companies and international groups.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 contacts → | ||||
Indirect evidence “E2M - Etude Max Mailliet was founded in 2008 with the aim of combining a rigorous internal structure with high-quality legal advice and a one-to-one approach, promoting the…” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 contacts → | ||||
Partial evidence “Sagnard & Associés is an independent full service law firm, established in the Grand Duchy of Luxembourg since 2008 with a strong focus on the financial and business community.” Source: RevenueBase Database · checked Sep 23, 2026Thanks. The Data Team will review it. | |||||
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 5 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 5 law firms.
- Partial evidence
- Its own public description names part of big 5 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 5 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 62 big 5 law firms based in Luxembourg
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Big 5 law firms based in Luxembourg at a glance
As of Sep 23, 2026Companies by employee count
Freshness & accuracy
How recently the business emails were verified and the company information checked
Email last verified
Median 25.0dCompany record updated
Median 63.0dHow 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 5 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 5 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 5 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 5 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, 232 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 5 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 5 law firms are there based in Luxembourg?
RevenueBase identified 62 big 5 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?
Kleyr Grasso, headquartered in Strassen, tops this list with the largest team on record.
Which city has the most big 5 law firms?
Luxembourg leads with 49 headquartered companies, followed by Esch-Sur-Alzette (2) and Howald (2).
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 232 verified decision-maker contacts tracked across these 62 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.