| Customthings 2337190 | MAKEBLOCK CO. LTD. | – | Pending | 2024 |
| CustomLink 1851734 · TMA1025846 | WALDEMAR LINK GMBH & CO. KG | 10 Medical | Registered | 2019 |
| CUSTOMSEAL 1665277 · TMA1029365 | TRIVASCULAR INC. (CALIFORNIA CORPORATION) | 5 Pharmaceuticals10 Medical | Registered | 2019 |
| CUSTOMINK 1607085 · TMA911794 · design | CUSTOMINK, LLC | 25 Clothing | Registered | 2015 |
| CUSTOMINK 1607079 · TMA910935 | CUSTOMINK, LLC | 35 Advertising40 Treatment42 Science | Registered | 2015 |
| CUSTOMINK 1607077 · TMA919365 · design | CUSTOMINK, LLC | 25 Clothing35 Advertising40 Treatment+1 | Registered | 2015 |
| CUSTOMERIQ 1490415 · TMA864654 | Itron Networked Solutions, Inc. | 42 Science | Registered | 2013 |
| CUSTOMVITE 1348242 · TMA767320 | Stella Pharmaceutical Canada Inc. a Canadian corporation | 5 Pharmaceuticals | Registered | 2010 |
| CUSTOMPOINT 1333219 · TMA709606 | R.R. DONNELLEY & SONS COMPANY | 42 Science | Registered | 2008 |
| CUSTOMYIZE 1302560 · TMA738234 | ACCO Brands Corporation | 16 Paper | Registered | 2009 |
| CUSTOMCARE 1181252 · TMA612938 | Monsanto Technology L.L.C. a Delaware limited liability company | 35 Advertising | Registered | 2004 |
| CustomCare 1180766 · TMA631728 | AGA FINANCIAL GROUP INC. | 36 Finance | Registered | 2005 |
| CUSTOMCOTE 1042866 · TMA549507 | DENTSPLY SIRONA Inc. | 1 Chemicals | Registered | 2001 |
| CustomStyle 1013889 · TMA540521 | Haier US Appliance Solutions, Inc. | 17 Rubber | Registered | 2001 |
| CUSTOMCATH 1010656 · TMA560152 | Biosense Webster, Inc. | 10 Medical42 Science | Registered | 2002 |
| CUSTOMAIR 0839172 · TMA489053 | HoMedics USA, LLC | 10 Medical20 Furniture | Registered | 1998 |
| CUSTOMLINE 0734633 · TMA439168 | DASHWOOD INDUSTRIES LIMITED | 19 Building | Registered | 1995 |
| CUSTOMLINE 0623568 · TMA365046 | The Chesterfield Shop (Ontario) Ltd. | 11 Lighting20 Furniture | Registered | 1990 |
| CUSTOMLINE 0501907 · TMA307792 | CertainTeed Ceilings Corporation | 6 Metal19 Building | Registered | 1985 |
| CustomKing 2318984 | Anhui Baba Rabbit Business Co. Ltd. | 21 Housewares | Pending | 2024 |
| CustomsCity 2303461 · design | Owner not listed | 9 Electronics42 Science | Pending | 2023 |
| CUSTOMIFY 2149076 | ATOMATED TECHNOLOGY CORP. | 9 Electronics14 Jewellery20 Furniture+7 | Pending | 2021 |
| CUSTOMAIRE 2130617 | Emco Corporation | 9 Electronics11 Lighting17 Rubber+2 | Pending | 2021 |
| CustomSwitch 1096047 · TMA621232 | ROYAL BANK OF CANADA | 36 Finance | Registered | 2004 |
| CUSTOMERLINK 0862473 · TMA511014 | an individual | 9 Electronics16 Paper35 Advertising+3 | Registered | 1999 |