| CONDUCTOR 1960364 · TMA1229760 · design | Conductor LLC | 42 Science | Registered | 2024 |
| CONDUCTOR 1880670 · TMA1094437 | ELI LILLY AND COMPANY | 9 Electronics44 Medical | Registered | 2021 |
| CONDUCTOR 1479966 · TMA790206 | Conductor LLC | 42 Science | Registered | 2011 |
| CONDUCTON 1022138 · TMA546508 · design | an individual | 2 Paints17 Rubber | Registered | 2001 |
| CONDUCTOR 2268336 | Sensei Labs Inc. | 9 Electronics42 Science | Pending | 2023 |
| CONDUCTOR 2037183 · design | KING CAR FOOD INDUSTRIAL CO. LTD. | 33 Wine | Pending | 2020 |
| CONDUCT 1806515 · TMA1027394 · design | Giant Manufacturing Co. Ltd. | 12 Vehicles | Registered | 2019 |
| CONDUCTIX 1254660 · TMA674123 | an individual | 6 Metal7 Machines9 Electronics | Registered | 2006 |
| CONDUCTILE 0521809 · TMA300671 | VPI, LLC, a Wisconsin limited liability company | 27 Carpets | Registered | 1985 |
| CONDUCTEX 0395823 · TMA224853 | BIRLA CARBON U.S.A. INC. | 1 Chemicals | Registered | 1977 |
| CONTACTNOW 1829178 · TMA1063427 | 8x8, Inc. | 9 Electronics37 Construction38 Telecommunications+1 | Registered | 2019 |
| CONDECO 1808376 · TMA1039142 | CONDECO GROUP LIMITED | 9 Electronics16 Paper41 Education+2 | Registered | 2019 |
| CONTACTPRO 1799303 · TMA1040735 | Young Microbrush, LLC | 10 Medical | Registered | 2019 |
| CONDICO 1774231 · TMA964764 | an individual | 35 Advertising45 Legal | Registered | 2017 |
| CONTACTPRO 1626888 · TMA883895 | Intellectual Atlantic Properties Inc. | 6 Metal9 Electronics16 Paper+6 | Registered | 2014 |
| CONTACTOR 1509467 · TMA824055 | Advanced Drainage Systems, Inc. | 6 Metal19 Building | Registered | 2012 |
| Condustar 1334594 · TMA753999 | ConduStar Corp. | 35 Advertising36 Finance37 Construction+1 | Registered | 2009 |
| CONDUCRETE 0877266 · TMA514346 · design | SHORE ACRES ENTERPRISES INC. | 1 Chemicals9 Electronics42 Science | Registered | 1999 |
| CondoCore 2321543 | Massive Canada Building Systems Inc. | 19 Building | Pending | 2024 |
| CONTACTO 2166939 | Plivo Inc | 9 Electronics38 Telecommunications42 Science | Pending | 2021 |
| CONDUCRETE 2036954 | SHORE ACRES ENTERPRISES INC. | 1 Chemicals37 Construction42 Science | Pending | 2020 |
| CONDOCENTRIC 1537029 · TMA846270 | Cost Inc. | 45 Legal | Registered | 2013 |
| CIMETECH 2256049 · TMA1237812 | Groupe Gestion Onsteel Inc. | 37 Construction42 Science | Registered | 2024 |
| CONTACKGLUE 2224764 · TMA1250115 · design | HIGH PERFORMANCE MANUFACTURING, LLC. | 1 Chemicals | Registered | 2024 |
| CONTIGO 2223537 · TMA1256475 | The Coleman Company, Inc. | 21 Housewares | Registered | 2024 |