These publicly traded companies in Brussels are primarily large, established firms across diverse sectors. Key industries include chemical manufacturing with Solvay, Umicore, Syensqo, and Tessenderlo Group, all focused on sustainable solutions and advanced materials. Financial services are represented by KBC Bank & Verzekering, a major integrated bank-insurer, and investment management by D鈥橧eteren Group and GBL. UCB is a significant biopharmaceutical company, while Proximus Group provides telecommunications services.
A notable pattern is the strong presence of chemical manufacturing companies, indicating a specialized industrial base in Brussels. Many of these firms, such as Solvay (founded 1863) and Umicore (founded 1805), have long histories, suggesting a mature and resilient corporate landscape.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Solvaysolvay.com
Develops essential chemical solutions including soda ash and peroxides for cleaner mobility, healthier living, and sustainable infrastructure across global industrial sectors. |
16,499 | |||
| 2 | 14,875 | ||||
| 3 |
KBC Bank & Verzekeringkbc.be
A leading integrated bank-insurer focused on individuals, private banking clients, and small to medium-sized enterprises in Belgium, Central and Eastern Europe Operating worldwide selectively |
13,565 | |||
| 4 |
Proximus Groupproximus.com
Provider of connectivity and digital services in Benelux and global markets, investing in networks, digital ecosystems, and innovative communication solutions. |
13,297 | |||
| 5 |
Umicoreumicore.com
Innovating materials technology for sustainable value, reducing emissions, advancing car technology, and driving towards a circular economy for a better life |
6,685 | |||
| 6 |
Syensqosyensqo.com
A leading science company revolutionizing technology to create sustainable, high-performance solutions for various industries worldwide with a global team of experts |
6,082 | |||
| 7 |
Elia Groupelia.be
Operation of extensive high-voltage electricity transmission networks in Belgium and Germany, ensuring balanced supply and supporting energy transition. |
2,759 | |||
| 8 |
Tessenderlo Grouptessenderlo.com
Global industrial group specializing in agriculture, bio-residual valorization, machinery, mechanical engineering, electronics, energy, and water-focused industrial solutions. |
1,800 | |||
| 9 |
Marsh Europemarsh.com
Global leader in insurance brokerage and risk advisory services, offering data-driven solutions for commercial and individual clients worldwide Operating in 130+ countries |
1,682 | |||
| 10 |
Mercer Europecorporate.marsh.com
Dedicated to providing advisory services and technological solutions to help organizations meet workforce health, investment, and career needs Operating in multiple countries |
1,235 | |||
| 11 |
Recticelrecticel.com
Innovative insulation solutions for buildings and acoustic needs, contributing to a carbon-free economy and better quality of life |
879 | |||
| 12 |
D鈥橧eteren Groupdieterengroup.com
Manages and develops a portfolio of international businesses including vehicle glass repair, automotive distribution, parts, material handling, lifestyle brands, and real estate. |
405 | |||
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. | |||||
| 13 |
Belgian Post Groupbpost.be
Leader in postal solutions and financial services, ensuring secure electronic delivery and customer satisfaction through simple processes and passionate employees |
398 | |||
| 14 |
Spadelspadel.com
A European group that produces and markets natural mineral waters, spring waters, and mineral water soft drinks focused on sustainability and local products |
379 | |||
| 15 |
GBL (Groupe Bruxelles Lambert)gbl.be
Established investment holding active in Europe with a diversified portfolio of listed, private, and alternative investments, focused on long-term value creation and responsible investing |
353 | |||
| 16 |
Sofinasofinagroup.com
A Belgium-based investment company supporting entrepreneurs and families managing growing companies through direct investments and Private Equity funds in Europe, USA, and Asia |
317 | |||
| 17 |
Immobelimmobelgroup.com
A leading European real estate developer specializing in innovative urban projects with mixed functions and a focus on sustainability and social impact |
177 | |||
| 18 |
BIO - the Belgian Investment Company for Developing Countriesbio-invest.be
Investment in private sector projects in developing countries to promote economic growth, sustainable development, and achievement of Sustainable Development Goals. |
98 | |||
| 19 |
Cenergy Holdingscenergyholdings.com
Investment group focusing on energy transfer, renewables, and data transmission, aiming for a low carbon economy and leading roles in industrial sectors |
64 | |||
| 20 | 48 | ||||
| 21 |
STIKstik-cbd.be
The company sells high quality organic Hemp Flowers (CBD) and E-Liquids, free from any chemical products |
41 | |||
| 22 |
Securitas Europesecuritas.com
A European company offering comprehensive security services, specializing in airport security and serving a diverse range of industries and clients |
39 | |||
| 23 |
Banimmobanimmo.be
Real estate developer with over 20 years of experience, focusing on innovative solutions and customer needs, with potential for significant development |
32 | |||
| 24 |
Queserser & Company EUqueserser.eu
A creative communications, marketing, and production company based in Japan with multiple branches globally Specializing in omnichannel optimization and foreign market entry |
6 | |||
| 25 |
Weichie.comweichie.com
A digital agency in Brussels and New York specializing in creating high-quality websites, e-commerce platforms, and applications for brands Promoting businesses online |
4 | |||
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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.
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