Investigation and security activities: largest employers
142 Belgian companies in the sector (NACE 80) report employees in recent accounts; here are the top 20. Securitas leads with 4,594.8 FTE (financial year 2025).
Top 20
Ranked by average headcount (FTE) reported in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | Securitas 1831 Machelen (Brab.) | €215.8m | €369.4m | €45.3m | 4,594.8 | 2025 |
| 2 | G4S Secure Solutions 1000 Brussels | €109.6m | €187.6m | −€5.91m | 3,159.9 | 2025 |
| 3 | Protection Unit 4470 Saint-Georges-sur-Meuse | €64.6m | €145.8m | €1.07m | 2,196.9 | 2025 |
| 4 | G4S Aviation Security 1000 Brussels | €38.2m | €94.6m | €19.3m | 1,664.8 | 2025 |
| 5 | SERIS Security 1831 Machelen (Brab.) | €40.5m | €90.2m | €11.7m | 1,274.6 | 2025 |
| 6 | Securitas Transport Aviation Security 1910 Kampenhout | €13.8m | €34.2m | €6.22m | 452.9 | 2025 |
| 7 | Tutela Novitas Defensio Security 9000 Ghent | €9.02m | €24.4m | 859,830 € | 404.3 | 2025 |
| 8 | Maat Security 3560 Lummen | €7.33m | €24.7m | 416,012 € | 386.4 | 2025 |
| 9 | High Security 1457 Walhain | €7.95m | €23.6m | 452,944 € | 353.0 | 2025 |
| 10 | Loomis Belgium 1930 Zaventem | €22.6m | €20.5m | 850,790 € | 217.5 | 2025 |
| 11 | Verisure 1130 Brussels | €82.7m | €142.7m | €50.5m | 200.6 | 2025 |
| 12 | Securitas Technology 1070 Anderlecht | €25.0m | €32.1m | −€29.5m | 187.8 | 2025 |
| 13 | European Private Security 1081 Koekelberg | €1.89m | — | −463,114 € | 182.0 | 2025 |
| 14 | Torann 2000 Antwerp | €4.00m | €9.40m | 403,093 € | 165.1 | 2025 |
| 15 | Optimalis Security 1301 Wavre | €2.50m | — | 636,550 € | 165.0 | 2025 |
| 16 | Seris Technology 3200 Aarschot | €12.5m | €35.1m | €3.70m | 148.1 | 2025 |
| 17 | Alertis 8800 Roeselare | €14.1m | €21.8m | €6.73m | 120.8 | 2025 |
| 18 | Security Masters 2170 Antwerp | €2.38m | €8.07m | 606,292 € | 111.2 | 2025 |
| 19 | I.P.G.S 1000 Brussels | €2.81m | — | 672,590 € | 100.8 | 2024 |
| 20 | Protection Unit Events 4470 Saint-Georges-sur-Meuse | €5.30m | €15.5m | 469,784 € | 99.7 | 2025 |
Headcount reported by the company for all its sites: the jobs may be located elsewhere.
“—”: not published. Small companies (micro and abridged accounts) do not have to publish their revenue.
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Frequently asked questions
Who is the largest employer in Investigation and security activities?
Securitas, with 4,594.8 full-time equivalents reported (financial year 2025).
How many Investigation and security activities companies report employees?
142 out of 531, in accounts less than 3 years old.
Analyse companies in Investigation and security activities
Filter these companies by size, soundness and trend, follow them and get an alert when their accounts or publications change.
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 12 Nov 2026.