These professional services firms in Luxembourg are primarily large companies focused on financial services, legal practices, and IT consulting, with a significant presence of biotechnology research firms. Noteworthy examples include Alter Domus, which supports investment managers, IQ-EQ, providing global investor services, and PwC Luxembourg, offering audit, tax, and advisory services. Sword Group specializes in data insights and digital transformation, while Arendt & Medernach is a leading independent law firm.
The data shows a concentration of headquarters in Luxembourg City, with a few companies located in nearby towns such as Windhof, Howald, and Leudelange. Many of these firms, such as Alter Domus (2003), Sword Group (2000), and Netcompany-Intrasoft (1996), were founded around the turn of the millennium, indicating a period of growth in these sectors.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Eurofinseurofins.com
An international life sciences company offering analytical testing services in food, environmental, pharmaceutical, and cosmetic industries, ensuring safety and authenticity |
24,896 | |||
| 2 |
Alter Domusalterdomus.com
Providing end-to-end expertise and technology solutions to support investment managers and asset owners in managing alternative investments efficiently and effectively. |
6,082 | |||
| 3 | 5,745 | ||||
| 4 |
PwC Luxembourgpwc.lu
Largest professional services firm providing audit, tax, and advisory services, including management consulting, to diverse local and multinational clients in Luxembourg. |
3,543 | |||
| 5 |
Quintet Private Bankquintet.lu
Private bank serving wealthy individuals, families, and institutions across Europe, focusing on personalized wealth protection and growth strategies. |
2,253 | |||
| 6 |
Sword Groupsword-group.com
Specialists in data insights, digital transformation, and technology services supporting complex IT and business projects across over 50 countries. |
2,170 | |||
| 7 |
KPMG Luxembourgkpmg.com
Independent firms providing audit, tax, and advisory services worldwide, operating under a global brand with distinct legal entities. |
1,863 | |||
| 8 |
Eurofins PSS Insourcing Solutionseurofinspss.com
Eurofins Professional Scientific Services redefines industry norms by providing insourcing solutions for scientific operations, HR practices, and operational excellence globally |
1,840 | |||
| 9 |
Netcompany-Intrasoftnetcompany.com
A leading European IT Solutions and Services Group, offering innovative solutions to international and national public and private organizations worldwide |
1,687 | |||
| 10 |
Arendt & Medernacharendt.com
Leading independent law firm providing specialist legal, regulatory, taxation, and advisory services for international and domestic clients conducting business activities within Luxembourg. |
889 | |||
| 11 |
Dennemeyerdennemeyer.com
Provides comprehensive Intellectual Property protection, management, legal services, strategy consulting, software, maintenance, and patent analytics for diverse global clients. |
812 | |||
| 12 | 784 | ||||
| 13 |
Morgan Philips Groupfr.morganphilips.com
Providing innovative global talent solutions including executive search, recruitment, talent consulting, outplacement, and interim management services worldwide. |
774 | |||
| 14 |
Eurofins Consumer Product Testingeurofins.com
Specializing in non-food consumer product testing, the company offers tailored quality assurance solutions, from supplier assessment to compliance, including testing, inspections, and regulatory guidance globally |
734 | |||
| 15 |
Zeentechzeentech.com.br
Specialists in engineering systems, simulations, testing, and high-tech solutions for automotive, railway, aerospace, and agricultural industries, providing innovative business solutions with certified quality management |
698 | |||
| 16 |
BDO Luxembourgbdo.lu
Provides audit, tax consultancy, accounting, payroll, financial engineering, investment fund services, advisory, human resources, and IT solutions to diverse business sectors. |
645 | |||
| 17 |
SOA PEOPLEsoapeople.com
Specializes in SAP consulting and services, supporting business transformation with proven methodologies and strong partnerships across various industries. |
613 | |||
| 18 |
Elvinger Hoss Prussenelvingerhoss.lu
A Luxembourg-based legal firm founded in 1964, providing exceptional legal advice to businesses, institutions, and entrepreneurs with a focus on excellence and creativity |
534 | |||
| 19 |
ATOZ Servicesatoz-services.lu
Provides comprehensive corporate and management services, including tax compliance, fund services, and regulatory support, for Luxembourg-based businesses. |
407 | |||
| 20 |
Centralis Groupcentralisgroup.com
Provider of alternative investments and corporate services worldwide, specializing in tailor-made solutions for multinational organizations, private equity, real estate, and individuals |
400 | |||
| 21 |
ATOZ Tax Advisersatoz.lu
High-end advisory firm specializing in tax, corporate implementation, and finance solutions for international organizations, with a focus on optimizing investment value |
397 | |||
| 22 |
Forvis Mazars in Luxembourgforvismazars.com
International partnership providing audit, tax, advisory, accounting, and legal services with over 50,000 professionals supporting clients worldwide. |
367 | |||
| 23 |
AMPLEXOR Internationalacolad.com
Providing digital solutions for compliance, content management, consulting, and integration across multiple industries to improve efficiency and revenue. |
354 | |||
| 24 |
Schroeder & Associés S.A.schroeder.lu
With over 50 years of experience, our company provides construction engineering services, collaborating with architects and engineers to meet customers' needs efficiently |
343 | |||
| 25 |
Grant Thornton Luxembourggrantthornton.lu
Provider of Audit, Business Advisory, Tax, Financial Services, and Technology solutions in Luxembourg, serving various entities with global expertise and local market understanding |
334 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 | 334 | ||||
| 27 |
Eurofins Softlines & Hardlineseurofins.com
Global provider of testing, inspections, audits, certification, and sustainability services for consumer products Specializes in softlines, leather goods, footwear, toys, and hard goods |
333 | |||
| 28 |
Arendt Investor Servicesarendt.com
Arendt - Investor Services offers integrated fund and corporate services, governance, compliance, and tax services supervised by CSSF |
332 | |||
| 29 |
Skeliaskelia.com
An international leader in building cross-border IT and engineering teams, offering services through a network of service centers in multiple countries |
299 | |||
| 30 |
Astorgastorg.com
Global private equity firm managing €21 billion in assets with offices in major financial hubs Investment team includes 70 professionals |
258 | |||
| 31 |
FundRockfundrock.com
Provides independent UCITS Management Company and AIFM services, offering risk management, oversight, and compliance, integrating with client investment decision-making processes, globally. |
232 | |||
| 32 | 215 | ||||
| 33 |
Luxcontrolluxcontrol.com
Luxcontrol offers safety, health, environmental, and product quality services to help clients comply with regulations They aim to build a safer world with a team of 250 experts |
210 | |||
| 34 |
AVEGA Luxembourgavega.lu
Provides tailored corporate, fund administration, and tax compliance services for businesses and investment vehicles, leveraging local expertise and international presence. |
184 | |||
| 35 |
Apex Group (Luxembourg)apexgroup.com
Global financial services provider offering a wide range of services to asset managers, capital markets, private clients, and family offices worldwide |
168 | |||
| 36 |
HACA Partnershacapartners.lu
HACA Partners specializes in providing tailored governance models, internal and external audits, regulatory compliance, risk management, and consulting services for businesses |
130 | |||
| 37 |
SustainCERTsustain-cert.com
Provides independent validation and verification services for carbon markets and value chains, aligning with international sustainability frameworks. |
67 | |||
| 38 |
Opportunity Financial Servicesopportunityfs.com
A pioneer in integrated financial solutions for startups and corporate clients, specializing in company incorporation, accounting, tax compliance, and fund administration Dedicated to outstanding customer service |
48 | |||
| 39 |
Chemservice Groupchemservice-group.com
A global consultancy providing expert advice on national and international chemical regulations, offering scientific, technical, and strategic solutions for clients worldwide |
44 | |||
| 40 |
Genève Invest Groupgeneveinvest.com
Trustworthy wealth management empowering individuals to invest successfully for a financially secure future. Active asset management and fixed income securities. |
34 | |||
| 41 | 
COMMISSAIRE AUX COMPTES S.A.
The company provides a range of financial services in Luxembourg, including auditing, liquidation, administrative management, tax advice, and business consulting |
22 | |||
| 42 |
Nordlux Vermögensmanagement S.A.
A privately owned company in Luxembourg specializing in investment advisory, portfolio and fund management, asset management, and insurance brokerage for affluent individuals |
21 | |||
| 43 |
Fiduciaire Générale de Luxembourgfgl.lu
A respected player in auditing, taxation, and management consultancy services, with expertise spanning 60 years, serving local, cross-border, and international clients |
19 | |||
| 44 |
FRONT Consultingfront-consulting.com
Asset management consultants specializing in transformation projects, offering services from advisory to deployment in areas such as data management, reporting, compliance, and risk management |
18 | |||
| 45 |
Circumference FS Luxembourgcircumferencefs.com
The company provides expertise in international financial services jurisdiction, assisting business entities with legal, accounting, and local knowledge for maximizing benefits |
17 | |||
| 46 |
Ziffer Groupziffer.lu
Ziffer offers corporate administration and family office services in Luxembourg, focusing on wealth preservation with a team of global professionals |
16 | |||
| 47 |
Klarphosklarphos.com
Luxembourg-based asset manager offering customized portfolio solutions and advisory services for institutional clients focused on alternative investments, asset allocation, and ALM optimization |
15 | |||
| 48 |
BIL Manage Invest - now Waystonewaystone.com
Provides third-party AIFM and management company solutions for UCITS and Alternative Investment Funds domiciled in Luxembourg, backed by BIL Group. |
12 | |||
| 49 |
Label R.label-r.com
Label R provides ESG and ethical certification, due diligence, and second party opinions for fund managers, private equity funds, and sustainable bonds |
11 | |||
| 50 |
TriFinance Luxembourgtrifinance.com
TriFinance is an international growth company offering finance and control services, focusing on hands-on advice, implementation support, and personalized career development |
10 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
More company lists in Luxembourg
- The largest companies in Luxembourg 799
- Multinational companies in Luxembourg 340
- Financial services firms in Luxembourg 255
- Financial Services companies in Luxembourg 171
- Critical infrastructure operators in Luxembourg 79
- Investment Management companies in Luxembourg 75
- Venture capital and private equity firms in Luxembourg 71
- Manufacturers in Luxembourg 59
- Companies with in-house R&D in Luxembourg 55
- IT Services and IT Consulting companies in Luxembourg 42
- SaaS companies in Luxembourg 41
- Corporate groups and holding companies in Luxembourg 39
- Consulting firms in Luxembourg 37
- Retail chains in Luxembourg 37
- IT services companies in Luxembourg 37
- Software Development companies in Luxembourg 36
- Banking companies in Luxembourg 34
- Public sector organisations in Luxembourg 34
- Family-owned companies in Luxembourg 32
- Logistics companies in Luxembourg 31
- Construction companies in Luxembourg 30
- Transportation, Logistics, Supply Chain and Storage companies in Luxembourg 30
- Insurance companies in Luxembourg 29
- Hardware manufacturers in Luxembourg 28