| CONTRACTOR 0586076 · TMA342273 | an individual | 28 Toys | Registered | 1988 |
| ContractorX 2370370 | Owner not listed | 42 Science | Pending | 2024 |
| CONTRACTOR 333 2242537 | Whirlpool Properties Inc. | 7 Machines | Pending | 2023 |
| CONTRACTOR 1000 2202344 · TMA1242610 | EMERSON ELECTRIC CO. | 7 Machines | Registered | 2024 |
| ContractorCheck 1450975 · TMA776405 | ContractorCheck Limited | 9 Electronics42 Science | Registered | 2010 |
| CENTRICFLOW 1890199 · TMA1072742 | WESTFALIA SEPARATOR, INC. | 7 Machines9 Electronics | Registered | 2020 |
| CONTRACTOSEAL 1413516 · TMA756899 | GESTION SOPREMA CANADA INC. / HOLDING SOPREMA CANADA INC. | 1 Chemicals2 Paints3 Cosmetics+2 | Registered | 2010 |
| CONTRACTERP 1411135 · TMA796915 | Access Information Technologies, Inc. | 9 Electronics | Registered | 2011 |
| CentraFlow 1338393 · TMA764373 | AstenJohnson, Inc. | 7 Machines | Registered | 2010 |
| CENTRICFLOW 1282728 · TMA732631 | WESTFALIA SEPARATOR, INC. | 7 Machines | Registered | 2009 |
| CONTRACTSAFE 2360736 | ContractSafe LLC | 42 Science | Pending | 2024 |
| Centracondos 1696222 · TMA1023931 | Centra Construction Group Ltd. | 36 Finance37 Construction | Registered | 2019 |
| CONTROLNOW 1695591 · TMA947278 · design | N-ABLE TECHNOLOGIES LTD | 38 Telecommunications39 Transport42 Science | Registered | 2016 |
| CONTROLNOW 1695588 · TMA947281 | N-ABLE TECHNOLOGIES LTD | 38 Telecommunications39 Transport42 Science | Registered | 2016 |
| CONTRASTVIEW 1515999 · TMA835314 | an individual | 19 Building21 Housewares | Registered | 2012 |
| CONTRAFLAM 1192636 · TMA637335 | Owner not shown | 19 Building21 Housewares42 Science | Registered | 2005 |
| CONTRAFLAM 0512538 · TMA300560 | Owner not shown | 12 Vehicles19 Building20 Furniture+1 | Registered | 1985 |
| CONTRACTEXPRESS 1441486 · TMA787757 | Thomson Reuters Canada Limited | 9 Electronics42 Science | Registered | 2011 |
| CENTERRA 2303916 · TMA1276611 | RINNAI AMERICA CORPORATION | 11 Lighting | Registered | 2024 |
| CONDOR 2250673 · TMA1247336 | Owner not listed | 12 Vehicles | Registered | 2024 |
| CONTRAST 2249451 · TMA1267406 | 2612363 ONTARIO LIMITED | 9 Electronics35 Advertising36 Finance+4 | Registered | 2024 |
| COUNTERCADE 2243552 · TMA1251624 | Owner not listed | 28 Toys | Registered | 2024 |
| CENTRAL 23 2234134 · TMA1256705 | CENTRAL 23 LIMITED | 16 Paper | Registered | 2024 |
| Centripet 2228340 · TMA1244545 | an individual | 42 Science | Registered | 2024 |
| COINTRACKER 2221393 · TMA1267006 | Nino Finance, Inc. | 9 Electronics42 Science | Registered | 2024 |