| DICOM 1773531 · TMA984244 · design | Dicom Transportation Group Canada, Inc. | 39 Transport | Registered | 2017 |
| DICOM 1766586 · TMA959759 | Dicom Transportation Group Canada, Inc. | 39 Transport | Registered | 2017 |
| DCOM 1530757 · TMA833422 | Continuous Learning Group, Inc. an Ohio corporation | 35 Advertising | Registered | 2012 |
| Dacom 1402750 · TMA750715 | Dacom Technical Services Inc. | 38 Telecommunications42 Science | Registered | 2009 |
| DICOM 0813984 · TMA536791 | NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION | 42 Science | Registered | 2000 |
| DIACOM 1853412 · TMA1044179 · design | an individual | 9 Electronics10 Medical | Registered | 2019 |
| DEXCOM 1626225 · TMA916515 | DexCom, Inc. | 9 Electronics10 Medical44 Medical | Registered | 2015 |
| DASCOM 1461185 · TMA866321 · design | Beijing Dascom Electronics Co. Ltd. | 9 Electronics | Registered | 2013 |
| DUOCOM 1394261 · TMA746289 | DUOCOM CANADA INC. | 37 Construction41 Education42 Science | Registered | 2009 |
| DECOMA 0590458 · TMA374721 | Magna International Inc. | 7 Machines9 Electronics40 Treatment+1 | Registered | 1990 |
| DCIM 2056487 · TMA1128572 | KraussMaffei Technologies GmbH | 7 Machines | Registered | 2022 |
| DCM 1915318 · TMA1132476 | Owner not shown | 9 Electronics35 Advertising42 Science | Registered | 2022 |
| DHCM 1880396 · TMA1051417 | TROLL CO. LTD. | 16 Paper25 Clothing | Registered | 2019 |
| DCAM 1823703 · TMA1075207 | Intelliview Technologies Inc. | 9 Electronics | Registered | 2020 |
| DCM 1643658 · TMA916092 | DCM Group Industrial Contractors Inc. / Groupe de construction industrielle DCM Inc. | 37 Construction | Registered | 2015 |
| DCM 1499722 · TMA855283 | DCM De Ceuster Meststoffen, joint stock company | 1 Chemicals5 Pharmaceuticals29 Meat+3 | Registered | 2013 |
| DUCON 1314308 · TMA726880 | Dr. Stephan Hauser and Ducon GmbH, a partnership. | 6 Metal19 Building | Registered | 2008 |
| DECON 0619964 · TMA363839 · design | Decon U.S.A. Inc. | 6 Metal | Registered | 1989 |
| DECON 0619963 · TMA363212 · design | Decon U.S.A. Inc. | 6 Metal | Registered | 1989 |
| DICON 0417114 · TMA238760 | Owner not shown | 41 Education42 Science | Registered | 1979 |
| DYCEM 0363939 · TMA200093 | Dycem Limited | 5 Pharmaceuticals7 Machines9 Electronics+4 | Registered | 1974 |
| DICON 0359838 · TMA197585 | BRK BRANDS, INC. | 9 Electronics | Registered | 1974 |
| DUCON 0284848 · TMA144811 | DUCON TECHNOLOGIES, INC. | 7 Machines9 Electronics | Registered | 1966 |
| DYCEM 2324748 · design | Dycem Limited | 17 Rubber21 Housewares27 Carpets | Pending | 2023 |
| DKCM 2313086 | Davidson Kempner Capital Management LP | 36 Finance | Pending | 2024 |