| 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 | ✓ |
| Evripos Janitorial Services LTD | 105 | $94,088,934 | 11 | ✓ |
| Domus Building Cleaning Co. Ltd. | 67 | $92,394,898 | 1 | ✓ |
| Dexterra | 172 | $72,403,395 | 5 | ✓ |
| M A Independent Building Services | 18 | $63,310,626 | 1 | ✓ |
| Toure Cleaning Services LTD | 159 | $55,478,005 | 8 | ✓ |
| Conciergerie Speico INC | 41 | $45,298,406 | 3 | ✓ |
| 9034-3476 Quebec INC | 40 | $44,750,254 | 1 | ✓ |
| Envirosafe Janitorial INC | 104 | $38,600,949 | 7 | ✓ |
| Best Service Pros Ltd. | 140 | $38,392,001 | 3 | ✓ |
| Cofomo Ottawa | 2 | $34,782,609 | 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 | ✓ |
| Commercial Cleaning Services | 30 | $23,090,754 | 3 | ✓ |
| Domus Building Cleaning Company | 26 | $18,017,816 | 4 | ✓ |
| Alpine Building Maintenance INC | 9 | $17,543,884 | 8 | ✓ |
| Reliable Window Cleaners (sudbury) Limited | 16 | $15,205,724 | 3 | ✓ |
| 520571 Ontario Ltd. | 18 | $15,168,097 | 1 | ✓ |
| 4089171 Canada Inc. | 35 | $15,126,088 | 3 | ✓ |
| Dust-moon Maintenance Limited | 18 | $15,039,197 | 2 | ✓ |
| M.p. Building Cleaning Services | 19 | $14,489,620 | 2 | ✓ |
| Bee-clean | 47 | $10,912,551 | 7 | ✓ |
| BGIS Global Solutions LTD | 3 | $9,991,459 | 1 | ✓ |
| Impact Cleaning Services LTD | 6 | $9,893,980 | 3 | ✓ |
| Kleenway Building Maintenance | 4 | $7,911,737 | 3 | ✓ |
| Dexterra Integrated Facilities | 8 | $7,890,007 | 1 | ✓ |
| Aramark Canada Ltd. | 17 | $7,845,625 | 2 | ✓ |
| Skyblue Services CORP | 43 | $7,507,656 | 3 | ✓ |
| SQM Janitorial Services Inc. | 21 | $6,955,350 | 11 | ✓ |
| Allen Maintenance Ltd | 4 | $5,970,235 | 2 | ✓ |
| Asbex LTD | 5 | $4,834,268 | 1 | ✓ |
| A-1 Sanitation | 92 | $4,686,931 | 1 | ✓ |
| Climate Works Heating AND Cooling | 2 | $4,309,876 | 1 | ✓ |
| Papasay Bee-clean GP Ltd. | 3 | $3,831,018 | 2 | ✓ |
| Lebel 4 Seasons Services Inc | 11 | $3,738,674 | 1 | ✓ |
| Winmar London | 8 | $3,447,383 | 1 | ✓ |
| Pimlico Productions Inc. | 7 | $3,243,394 | 1 | ✓ |
| Canadian Transit Company | 5 | $3,133,595 | 1 | ✓ |
| Buffalo And Fort Erie | 4 | $2,734,386 | 1 | ✓ |
| A1 Toilet Rentals | 2 | $2,403,573 | 1 | ✓ |
| 10647802 Canada Limited | 7 | $2,301,911 | 1 | ✓ |
| Glacier Maintenance INC | 27 | $2,075,855 | 1 | ✓ |
| Corporate Mirror INC | 6 | $2,045,435 | 6 | ✓ |
| CITY WIDE Window Cleaning & | 27 | $2,025,755 | 3 | ✓ |
| Hallmark Housekeeping Services Inc. | 17 | $1,981,352 | 3 | ✓ |
| Worldclass Manpower Servicesinc. | 15 | $1,940,239 | 2 | ✓ |