Investigation and security activities: highest revenue in Brussels
As of 14 Nov 2026, 17 companies in Investigation and security activities (NACE 80) in Brussels publish their revenue in recent accounts (financial years 2024 to 2025). The top 10 account for €487.8m, out of €489.1m for all of them; median revenue is €1.12m. G4S Secure Solutions leads with €187.6m (financial year 2025).
Top 17 · Investigation and security activities · Brussels
Ranked by revenue published in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | G4S Secure Solutions 1000 Brussels | €109.6m | €187.6m | −€5.91m | 3,159.9 | 2025 |
| 2 | Verisure 1130 Brussels | €82.7m | €142.7m | €50.5m | 200.6 | 2025 |
| 3 | G4S Aviation Security 1000 Brussels | €38.2m | €94.6m | €19.3m | 1,664.8 | 2025 |
| 4 | Securitas Technology 1070 Anderlecht | €25.0m | €32.1m | −€29.5m | 187.8 | 2025 |
| 5 | Oktopus 1050 Brussels | €11.0m | €10.6m | €2.81m | 58.0 | 2025 |
| 6 | G4S Secure Monitoring 1000 Brussels | €10.7m | €8.35m | €7.50m | 42.3 | 2025 |
| 7 | G4S Fire & Safety 1000 Brussels | €3.22m | €5.03m | €2.01m | 76.7 | 2025 |
| 8 | Euro Protection Surveillance 1070 Anderlecht | €4.89m | €4.59m | €2.75m | 27.7 | 2025 |
| 9 | Nomos 1070 Anderlecht | 724,166 € | €1.12m | 551,840 € | 14.3 | 2024 |
| 10 | Forum des Laboratoires Nationaux Europeens de Recherche Routiere - Forum of European National Highway Research Laboratories 1000 Brussels | €2.28m | €1.05m | 618,691 € | 2.0 | 2025 |
| 11 | Mercom Health 1160 Auderghem | 272,501 € | 696,870 € | −€2.32m | 9.1 | 2024 |
| 12 | G4S Security Solutions 1000 Brussels | 218,258 € | 179,571 € | −688,527 € | 0.9 | 2025 |
| 13 | AJM & Partners 1050 Ixelles | 784,935 € | 163,300 € | 10,117 € | — | 2024 |
| 14 | Beguard 1082 Berchem-Sainte-Agathe | 50,473 € | 134,975 € | −75,417 € | — | 2025 |
| 15 | Invictus Global Security 1160 Auderghem | 28,084 € | 84,514 € | −29,145 € | — | 2025 |
| 16 | Yondr Belgium 1210 Saint-Josse-ten-Noode | 810,784 € | 75,710 € | 419,423 € | — | 2025 |
| 17 | G4S Event Security 1000 Brussels | 85,393 € | 13,432 € | −877,573 € | 0.7 | 2025 |
Ranking based on each company's own annual accounts (statutory, not consolidated): a subsidiary and its parent appear separately, and the ranking differs from lists based on consolidated group accounts. These are the revenue figures published in the annual accounts. Small companies (micro and abridged accounts) do not have to publish theirs: they do not appear in this ranking.
Investigation and security activities across Belgium → All sectors · Brussels →
Other sectors · Brussels
- 10 Manufacture of food products56
- 18 Printing and reproduction of recorded media25
- 20 Manufacture of chemicals and chemical products27
- 21 Manufacture of basic pharmaceutical products and pharmaceutical preparations19
- 25 Manufacture of fabricated metal products, except machinery and equipment38
- 26 Manufacture of computer, electronic and optical products13
- 27 Manufacture of electrical equipment16
- 28 Manufacture of machinery and equipment n.e.c.11
- 32 Other manufacturing18
- 33 Repair, maintenance and installation of machinery and equipment21
- 35 Electricity, gas, steam and air conditioning supply49
- 38 Waste collection, recovery and disposal activities20
- 41 Construction of residential and non-residential buildings243
- 42 Civil engineering35
- 43 Specialised construction activities596
- 46 Wholesale trade733
- 47 Retail trade1,129
- 49 Land transport and transport via pipelines457
- 52 Warehousing, storage and support activities for transportation58
- 53 Postal and courier activities33
- 55 Accommodation69
- 56 Food and beverage service activities526
- 58 Publishing activities52
- 59 Motion picture, video and television programme production, sound recording and music publishing activities93
- 60 Programming, broadcasting, news agency and other content distribution activities12
- 61 Telecommunication33
- 62 Computer programming, consultancy and related activities337
- 63 Computing infrastructure, data processing, hosting and other information service activities43
- 64 Financial service activities, except insurance and pension funding273
- 66 Activities auxiliary to financial services and insurance activities97
- 68 Real estate activities722
- 69 Legal and accounting activities184
- 70 Activities of head offices and management consultancy485
- 71 Architectural and engineering activities; technical testing and analysis136
- 72 Scientific research and development27
- 73 Activities of advertising, market research and public relations164
- 74 Other professional, scientific and technical activities48
- 77 Rental and leasing activities43
- 78 Employment activities36
- 79 Travel agency, tour operator and other reservation service and related activities30
- 81 Services to buildings and landscape activities143
- 82 Office administrative, office support and other business support activities181
- 84 Public administration and defence; compulsory social security27
- 85 Education187
- 86 Human health activities259
- 87 Residential care activities100
- 88 Social work activities without accommodation156
- 90 Arts creation and performing arts activities84
- 92 Gambling and betting activities15
- 93 Sports activities and amusement and recreation activities77
- 94 Activities of membership organisations216
- 95 Repair and maintenance of computers, personal and household goods, and motor vehicles and motorcycles66
- 96 Personal service activities183
Municipalities with the most companies in the sector · Brussels
Frequently asked questions
Which company in Investigation and security activities in Brussels has the highest revenue?
G4S Secure Solutions, with €187.6m of published revenue (financial year 2025).
Why are some companies missing?
Small companies (micro and abridged accounts) do not have to publish their revenue: only the 17 that publish it, out of 77 companies in the sector in the area, are ranked.
Why does this ranking differ from other lists?
It uses each company's annual accounts as filed with the National Bank, not consolidated group accounts. A holding, a subsidiary or a purchasing entity can therefore appear separately. Only companies whose latest accounts are less than 3 years old are ranked.
Analyse companies · Brussels
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Open the full file →Active companies (legal entities) that have filed at least one set of annual accounts, based on the Crossroads Bank for Enterprises and the National Bank of Belgium. The sector is the main activity in the register; the municipality is that of the registered office. Data updated on 14 Nov 2026.