Archive management, systems and destruction

Companies (15) Ranking sector Top ranking Follow-up
1 Merak 2800 MECHELEN Sector ranking 1 Top ranking 8,942 Follow-up
2 Iron Mountain Belgium 1850 GRIMBERGEN Sector ranking 2 Top ranking 10,205 Follow-up
3 iGuana 1930 ZAVENTEM Sector ranking 3 Top ranking 12,073 Follow-up
4 Bruynzeel Storage Systems 1020 BRUSSEL Sector ranking 4 Top ranking 12,660 Follow-up
5 Youston 3600 GENK Sector ranking 5 Top ranking 13,748 Follow-up
6 Input For You 1702 GROOT-BIJGAARDEN Sector ranking 6 Top ranking 15,686 Follow-up
7 Asterion Belgium 2800 MECHELEN Sector ranking 7 Top ranking 17,091 Follow-up
8 Simon Conseil 1090 BRUSSEL Sector ranking 8 Top ranking 32,931 Follow-up
9 Baker & Stanley 2200 HERENTALS Sector ranking 9 Top ranking 72,812 Follow-up
10 Depot d'Histoires 3630 MAASMECHELEN Sector ranking 10 Top ranking 141,205 Follow-up
1 2

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