| COMBINATORX 1246961 · TMA744896 | CombinatoRx, Incorporated | 5 Pharmaceuticals42 Science44 Medical | Registered | 2009 |
| CombiMaster 1323324 · TMA698898 | an individual | 11 Lighting | Registered | 2007 |
| COMPENSATOR 0766497 · TMA473734 | HANOVER ARCHITECTURAL PRODUCTS BUSINESS TRUST, A PENNSYLVANIA CORPORATION | 20 Furniture | Registered | 1997 |
| COMBINAL 1576703 · TMA853396 · design | Owner not shown | 3 Cosmetics | Registered | 2013 |
| COMBINO 1519640 · TMA971856 | LIDL STIFTUNG & CO. KG | 30 Coffee | Registered | 2017 |
| COMBINO 1366962 · TMA741088 | Siemens Mobility GmbH | 12 Vehicles | Registered | 2009 |
| COMBINO 1311262 · TMA690526 | LIDL STIFTUNG & CO. KG | 29 Meat30 Coffee | Registered | 2007 |
| CombinOx 1189048 · TMA683055 | Röhm GmbH | 1 Chemicals42 Science | Registered | 2007 |
| COMBINO 1133972 · TMA591409 | LIDL STIFTUNG & CO. KG | 29 Meat30 Coffee | Registered | 2003 |
| CombiMat 1080573 · TMA579023 | JOHNS MANVILLE EUROPE GMBH | 1 Chemicals11 Lighting17 Rubber+3 | Registered | 2003 |
| COMBIMAT 0804138 · TMA479899 | Owner not shown | 11 Lighting | Registered | 1997 |
| COMBIMAT 0450217 · TMA255633 | Diversey, Inc. (a Delaware corporation) | 7 Machines | Registered | 1981 |
| CombiNeo 2298856 | Owner not listed | 9 Electronics11 Lighting | Pending | 2023 |
| CombineMaster 1836799 · TMA1059133 | CONTINENTAL REIFEN DEUTSCHLAND GMBH | 12 Vehicles | Registered | 2019 |
| COMBINED 2208163 · TMA1241593 · design | COMBINED INSURANCE COMPANY OF AMERICA | 9 Electronics35 Advertising36 Finance+1 | Registered | 2024 |
| COMBINE 2183064 · TMA1230411 | CENTURY GROUP LANDS CORPORATION | 43 Restaurants | Registered | 2024 |
| COMBINE 2008763 · TMA1160936 · design | LIDL STIFTUNG & CO. KG | 20 Furniture | Registered | 2023 |
| COMBINE 1460271 · TMA843425 | Under Armour, Inc. | 25 Clothing28 Toys | Registered | 2013 |
| COMBIMAX 0792753 · TMA480601 | an individual | 7 Machines11 Lighting12 Vehicles+1 | Registered | 1997 |
| COMPNETWORX 1603338 · TMA874297 · design | Gallagher Benefit Services (Canada) Group Inc. | 9 Electronics | Registered | 2014 |
| COMPENSATIONPRO 1099468 · TMA576884 | DOW JONES & COMPANY, INC. | 35 Advertising | Registered | 2003 |
| COMPMETRICA 2330845 · TMA1269105 · design | COMPMETRICA INC. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2024 |
| COMFYMOVE 2261010 · TMA1279542 | 1895968 Ontario Inc. | 39 Transport45 Legal | Registered | 2024 |
| COMPEONY 2257906 · TMA1276439 · design | Compeony BioTech Canada Ltd. | 3 Cosmetics29 Meat | Registered | 2024 |
| CHAMPION 2247872 · TMA1267220 | ABG-Champion LLC | 5 Pharmaceuticals | Registered | 2024 |