| CONSTECO 0990795 · NFLD795 | CONSOLIDATED STEEL CORPORATION (A DELAWARE CORPORATION) | 1 Chemicals6 Metal7 Machines+9 | Registered | 1919 |
| CONSTEL 2022715 · TMA1115415 · design | UPL LTD. | 1 Chemicals5 Pharmaceuticals | Registered | 2021 |
| ConStannic 1840023 · TMA1033857 | Atotech Deutschland GmbH | 1 Chemicals7 Machines | Registered | 2019 |
| CONSTRUCT 2206877 · TMA1282844 | an individual | 20 Furniture41 Education | Registered | 2025 |
| CONSTRUCT 2023576 · TMA1160986 | Vans, Inc. | 18 Leather | Registered | 2023 |
| CONSTANCY 1896380 · TMA1082070 · design | Weifang Yuelong Rubber Co. Ltd. | 12 Vehicles | Registered | 2020 |
| CONSTRUCT 1745420 · TMA978159 | Eagle View Technologies, Inc. | 42 Science | Registered | 2017 |
| CONSTRUCT 1677254 · TMA919177 | Construct Electrical Inc. | 37 Construction | Registered | 2015 |
| CONSTANCE 1565737 · TMA892235 | an individual | 18 Leather | Registered | 2014 |
| CONSTRIVE 2363414 · design | Conprofe Technology Group Co. Ltd. | 7 Machines | Pending | 2024 |
| CONSTANCE 2341955 · design | Owner not listed | 25 Clothing35 Advertising | Pending | 2024 |
| CONSTRACT 2289122 · design | Owner not shown | 20 Furniture40 Treatment | Pending | 2023 |
| CONSTRICTOR 1923585 · TMA1105419 | HUBBELL INCORPORATED | 9 Electronics | Registered | 2021 |
| CONSTRICTOR 1410896 · TMA754923 | Halliburton Energy Services, Inc. | 7 Machines | Registered | 2009 |
| CONSTRICTOR 2305698 | Owner not listed | 6 Metal | Pending | 2023 |
| CONSTANT 1966566 · TMA1285169 | CONSTANT INTERNATIONAL INC. | 1 Chemicals37 Construction40 Treatment+1 | Registered | 2025 |
| CONXTECH 1759722 · TMA1024204 | Conxtech, Inc. | 6 Metal37 Construction40 Treatment | Registered | 2019 |
| COINSTAR 1663221 · TMA1102823 | Coinstar Asset Holdings, LLC | 7 Machines9 Electronics16 Paper+3 | Registered | 2021 |
| CONGSTAR 1363194 · TMA820668 | an individual | 9 Electronics16 Paper25 Clothing+7 | Registered | 2012 |
| CONSTRUX 1246461 · TMA789978 | Blackstone Medical, Inc. | 9 Electronics10 Medical | Registered | 2011 |
| COINSTAR 1153180 · TMA650426 | Coinstar Asset Holdings, LLC | 35 Advertising36 Finance | Registered | 2005 |
| CONECTIS 1016507 · TMA690185 · design | an individual | 9 Electronics16 Paper42 Science | Registered | 2007 |
| CENESTIN 1016289 · TMA539519 | Teva Women's Health, LLC | 5 Pharmaceuticals | Registered | 2001 |
| CONSTRUX 0897865 · TMA526045 | CONSTRUX SOFTWARE BUILDERS, INC. | 9 Electronics35 Advertising41 Education+1 | Registered | 2000 |
| COINSTAR 0851063 · TMA500410 | Coinstar Asset Holdings, LLC | 9 Electronics16 Paper | Registered | 1998 |