Traffic signs and lights, cones

Companies (23) Ranking sector Top ranking Follow-up
1 Fero Group 2830 TISSELT Sector ranking 9 Top ranking 3,816 Follow-up
2 Genetec 5100 WIERDE Sector ranking 20 Top ranking 5,399 Follow-up
3 Signco 2830 WILLEBROEK Sector ranking 22 Top ranking 7,391 Follow-up
4 Trafic-Signalisation-Sécurité 7033 CUESMES Sector ranking 35 Top ranking 11,944 Follow-up
5 Stuer-Egghe 9100 SINT-NIKLAAS Sector ranking 245 Top ranking 15,445 Follow-up
6 Almaroma 9860 OOSTERZELE Sector ranking 248 Top ranking 15,684 Follow-up
7 Poncelet Signalisation 4400 FLEMALLE Sector ranking 50 Top ranking 20,370 Follow-up
8 Sodelux 6800 LIBRAMONT-CHEVIGNY Sector ranking 195 Top ranking 21,051 Follow-up
9 The City Rent 4960 MALMEDY Sector ranking 90 Top ranking 23,843 Follow-up
10 ProSafety 1402 THINES Sector ranking 15 Top ranking 28,802 Follow-up
1 2 3

(*) This company is not ranked by turnover.
How are companies ranked?