| COMPENSATOR 0766497 · TMA473734 | HANOVER ARCHITECTURAL PRODUCTS BUSINESS TRUST, A PENNSYLVANIA CORPORATION | 20 Furniture | Registered | 1997 |
| COMPENSATIONMASTER 0683081 · TMA402068 | COMPENSATIONMASTER CORPORATION | 9 Electronics16 Paper42 Science | Registered | 1992 |
| COMBINATOR 2195287 · TMA1206686 | ReelPlay Pty Ltd | 9 Electronics41 Education | Registered | 2023 |
| COMPANION 2045450 · TMA1282058 | an individual | 9 Electronics44 Medical | Registered | 2025 |
| Companero 2016564 · TMA1159874 | NORAC CONCEPTS, INC. | 1 Chemicals | Registered | 2023 |
| COMPNETWORX 1603338 · TMA874297 · design | Gallagher Benefit Services (Canada) Group Inc. | 9 Electronics | Registered | 2014 |
| COMPANION 1571433 · TMA861105 | Uniwell International Enterprises Corp | 12 Vehicles35 Advertising37 Construction | Registered | 2013 |
| CO2MPENSATE 1468318 · TMA847668 · design | ARKTIK GmbH | 9 Electronics35 Advertising36 Finance+1 | Registered | 2013 |
| COMPANION 1391808 · TMA743660 | GROWTH PRODUCTS LTD., a Corporation of the State of New York | 5 Pharmaceuticals | Registered | 2009 |
| COMBINATORX 1246961 · TMA744896 | CombinatoRx, Incorporated | 5 Pharmaceuticals42 Science44 Medical | Registered | 2009 |
| COMPANION 80 1223203 · TMA669773 | DJO, LLC | 10 Medical | Registered | 2006 |
| COMPANION 1176102 · TMA621713 | BOSE CORPORATION | 9 Electronics | Registered | 2004 |
| COMPANION 1093738 · TMA711496 | DPH Biologicals, LLC | 1 Chemicals | Registered | 2008 |
| COMPANION 1042698 · TMA553523 · design | GROUPE CIS LTÉE/CIS GROUP LTD | 35 Advertising | Registered | 2001 |
| COMPANION 1034472 · TMA587532 | Transform SR Brands LLC | 7 Machines8 Hand9 Electronics+3 | Registered | 2003 |
| COMPANION 1034471 · TMA545837 · design | Transform SR Brands LLC | 7 Machines8 Hand9 Electronics+2 | Registered | 2001 |
| COMPANION 0709142 · TMA440817 | Industrielle Alliance, Assurance et services financiers inc. / Industrial Alliance Insurance and Financial Services Inc. | 36 Finance | Registered | 1995 |
| COMPANION 0650380 · TMA389380 | Caire Medical Ltd. | 10 Medical | Registered | 1991 |
| CONVENTIONAIR 0526557 · TMA303219 | CANADIAN AIRLINES INTERNATIONAL LTD. | 35 Advertising39 Transport | Registered | 1985 |
| COMPANION 2304848 | B & W Custom Truck Beds, Inc. | 12 Vehicles | Pending | 2024 |
| COMPANYPRO 2261067 | Softech Capital Corp. | 9 Electronics42 Science | Pending | 2023 |
| Companion + 2171475 | Deutsche Aircraft GmbH | 9 Electronics12 Vehicles37 Construction+2 | Pending | 2021 |
| Companion 2171474 | Deutsche Aircraft GmbH | 9 Electronics12 Vehicles37 Construction+2 | Pending | 2021 |
| COMPMETRICA 2330845 · TMA1269105 · design | COMPMETRICA INC. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2024 |
| COMFYMOVE 2261010 · TMA1279542 | 1895968 Ontario Inc. | 39 Transport45 Legal | Registered | 2024 |