| GDI Services (canada) LP | 334 | $440,831,645 | 13 | ✓ |
| Imperial Cleaners | 486 | $194,181,853 | 7 | ✓ |
| Service STAR Building Cleaning Inc. | 124 | $185,300,401 | 5 | ✓ |
| Cleanmatters Janitorial Services | 77 | $137,406,316 | 2 | ✓ |
| Quantum Management Services | 43 | $119,249,277 | 10 | |
| Modis Canada | 55 | $117,215,214 | 5 | |
| Winmar (canada) International.ltd | 5 | $102,617,120 | 1 | |
| Evripos Janitorial Services LTD | 105 | $94,088,934 | 11 | ✓ |
| Domus Building Cleaning Co. Ltd. | 67 | $92,394,898 | 1 | ✓ |
| North Country Maintenance INC | 3 | $79,085,919 | 1 | |
| Commercial Building Cleaning | 67 | $74,501,492 | 1 | |
| Dexterra | 172 | $72,403,395 | 5 | ✓ |
| S i Systems ULC | 46 | $64,518,888 | 10 | |
| M A Independent Building Services | 18 | $63,310,626 | 1 | ✓ |
| LES Entreprises Fervel INC | 44 | $55,746,501 | 5 | |
| Toure Cleaning Services LTD | 159 | $55,478,005 | 8 | ✓ |
| Conciergerie Speico INC | 41 | $45,298,406 | 3 | ✓ |
| Altis Human Resources (Ottawa) | 208 | $44,852,830 | 35 | |
| 9034-3476 Quebec INC | 40 | $44,750,254 | 1 | ✓ |
| CORADIX Technology Consulting | 32 | $40,156,696 | 3 | |
| Envirosafe Janitorial INC | 104 | $38,600,949 | 7 | ✓ |
| Best Service Pros Ltd. | 140 | $38,392,001 | 3 | ✓ |
| Excel Human Resources | 164 | $37,265,876 | 40 | |
| Rightway Sanitation Services | 541 | $35,922,566 | 1 | |
| ADIRONDACK INFORMATION MANAGEMENT INC., AMITA CORPORATION, ARTEMP PERSONNEL SERVICES INC., THE AIM GROUP INC., IN JOINT VENTURE | 3 | $35,340,298 | 1 | |
| ALTIS Recruitment & Technology | 416 | $35,084,856 | 45 | |
| QMR Staffing Solutions Inc | 548 | $34,497,840 | 48 | |
| Aqua Power Cleaners (1979) Ltd. | 51 | $33,110,140 | 2 | |
| Christensen & Mclean Roofing Co. LT | 12 | $30,552,233 | 2 | |
| C & D Cleaning & Security Services Limited | 113 | $29,053,954 | 3 | |
| BEST Facilities Services Ltd. | 7 | $26,281,262 | 1 | |
| Specialty Building Services INC | 58 | $25,693,389 | 3 | ✓ |
| Bee-clean Building Maintenance | 89 | $25,238,912 | 7 | ✓ |
| Municipal Maintenance Inc. | 13 | $24,811,210 | 4 | ✓ |
| Clean Harbors Canada Inc | 448 | $24,012,098 | 14 | |
| Commercial Cleaning Services | 30 | $23,090,754 | 3 | ✓ |
| ABCO Maintenance Systems Inc. | 71 | $22,588,753 | 4 | |
| OMNI Facility Services Canada LTD | 18 | $21,748,225 | 4 | |
| Koprash Inc. | 31 | $21,328,562 | 3 | |
| Sunlite Floor Cleaners | 21 | $21,319,018 | 1 | |
| Mobile Resource Group | 116 | $21,163,688 | 34 | |
| Industries DE Maintenance Empire, S.e.c. | 29 | $20,880,323 | 1 | |
| MaxSys Staffing Consulting | 106 | $18,118,902 | 22 | |
| Domus Building Cleaning Company | 26 | $18,017,816 | 4 | ✓ |
| Cofomo Ottawa | 3 | $17,917,602 | 2 | ✓ |
| R & D Janitorial Services Ltd. | 26 | $17,617,465 | 1 | |
| Alpine Building Maintenance INC | 9 | $17,543,884 | 8 | ✓ |
| Dynamic Facility Services Ltd. | 38 | $17,178,620 | 5 | |
| Maintenance Trans-quebec Inc. | 25 | $16,067,295 | 3 | |
| Services D'entretien Solmex Inc | 78 | $15,875,514 | 1 | |