| COMBISMILE 1862028 · TMA1074496 | an individual | 16 Paper20 Furniture | Registered | 2020 |
| COMBISAFE 1740081 · TMA1008757 | an individual | 6 Metal16 Paper17 Rubber+1 | Registered | 2018 |
| COMBISAFE 1325095 · TMA785262 | an individual | 6 Metal37 Construction41 Education+1 | Registered | 2010 |
| COMPUSCALE 0452747 · TMA251049 | Siemens Milltronics Process Instruments Inc. | 7 Machines9 Electronics | Registered | 1980 |
| COMBISTAR 1682243 · TMA956784 | Owner not shown | 11 Lighting | Registered | 2016 |
| COMBOCARE 1650840 · TMA903689 | Roscoe Medical, Inc. | 10 Medical | Registered | 2015 |
| CONFISCATED 1921571 · TMA1103158 | an individual | 33 Wine | Registered | 2021 |
| combiSwift 1892447 · TMA1088364 | an individual | 16 Paper20 Furniture | Registered | 2020 |
| ComboCap 1864579 · TMA1094473 | ComboCap, Inc. | 5 Pharmaceuticals40 Treatment | Registered | 2021 |
| COMBIGENE 1488534 · TMA801860 | Ovo Fertility Inc. | 44 Medical | Registered | 2011 |
| COMBIWASH 1279079 · TMA677222 | Mark VII Equipment Inc. | 7 Machines8 Hand | Registered | 2006 |
| COMPCARE 1225123 · TMA676004 | Goodman Manufacturing Company, L.P. (a Texas corporation) | 36 Finance | Registered | 2006 |
| CAMPUSCARE 1210032 · TMA633104 | Campus Management Corp, a legal entity | 42 Science | Registered | 2005 |
| COMBICLEAN 1184088 · TMA617894 | ECS Holdings, Inc. | 7 Machines | Registered | 2004 |
| CAMPUSCARE 1182568 · TMA659128 | CANAM INSURANCE SERVICES (2018) LIMITED | 36 Finance | Registered | 2006 |
| COMBIGAN 1113303 · TMA582677 | AbbVie Corporation | 5 Pharmaceuticals | Registered | 2003 |
| COMBOSAVER 1097368 · TMA582156 | ACCO Brands Corporation | 6 Metal | Registered | 2003 |
| COMPUCAGE 0881526 · TMA547662 | Compucage International Inc. | 9 Electronics20 Furniture | Registered | 2001 |
| COMBICON 0876947 · TMA519620 | Phoenix Contact GmbH & Co. KG | 9 Electronics | Registered | 1999 |
| COMPUSAFE 0820166 · TMA514766 | Brink's Network, Incorporated (a Delaware Corporation) | 36 Finance38 Telecommunications | Registered | 1999 |
| COMPUSAFE 0801137 · TMA514768 | Brink's Network, Incorporated (a Delaware Corporation) | 6 Metal | Registered | 1999 |
| COMPUSCOPE 0604829 · TMA358946 | Gage Applied Technologies Inc. | 9 Electronics | Registered | 1989 |
| COMBOCORE 2344758 | Owner not listed | 42 Science | Pending | 2024 |
| ComboCard 0907635 | HER MAJESTY THE QUEEN IN RIGHT OF ONTARIO AS REPRESENTED BY THE MINISTRY OF TRANSPORTATION | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1995 |
| COMPOSTABLES 2243961 · TMA1263143 · design | Owner not listed | 8 Hand16 Paper21 Housewares | Registered | 2024 |