| DELTAX 2260752 · TMA1281146 | Deltax Accounting & Tax Services Inc. | 35 Advertising36 Finance | Registered | 2025 |
| DELTEK 0864419 · TMA550765 | Refractory Intellectual Property GmbH & Co. Kg | 1 Chemicals6 Metal19 Building | Registered | 2001 |
| DELTEK 0840694 · TMA499455 | DELTEK, INC. | 9 Electronics42 Science | Registered | 1998 |
| DELTEC 0764056 · TMA449444 | SMITHS MEDICAL ASD, INC. a Delaware corporation | 2 Paints5 Pharmaceuticals6 Metal+6 | Registered | 1995 |
| DALTEX 0763729 · TMA445305 | DON & LOW LIMITED | 24 Textiles | Registered | 1995 |
| DELTEK 0581732 · TMA351578 | Refractory Intellectual Property GmbH & Co. Kg | 11 Lighting17 Rubber | Registered | 1989 |
| DALTEX 2330307 · design | Owner not listed | 31 Fresh | Pending | 2024 |
| DELTECH 1845540 · TMA1082668 | DANELCO ELECTRICAL CONTRACTING LTD. | 37 Construction | Registered | 2020 |
| DELITES 2306862 · design | Owner not shown | 30 Coffee | Pending | 2023 |
| deltaG 2207100 · TMA1253745 | TdeltaS Limited | 5 Pharmaceuticals32 Beer | Registered | 2024 |
| DELTAQ 1769985 · TMA963766 | TRANSOM POST OPCO, LLC | 9 Electronics | Registered | 2017 |
| Deltus 1615394 · TMA894640 | Owner not shown | 6 Metal20 Furniture | Registered | 2015 |
| DALTEC 1542452 · TMA854985 · design | Daltec Canadian Buffalo Manufacturing Ltd. | 7 Machines37 Construction40 Treatment+1 | Registered | 2013 |
| DEALTUS 2264922 · TMA1284927 · design | Dongguan Yudong Electronics Co. Ltd. | 9 Electronics | Registered | 2025 |
| DUALTEC 0692950 · TMA408119 · design | Honeywell International Inc. (a Delaware Corporation) | 9 Electronics | Registered | 1993 |
| DalTech 0909882 | DALHOUSIE UNIVERSITY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1998 |
| DELTAXSFT 1710241 · TMA1027306 | DePuy Synthes, Inc. | 10 Medical | Registered | 2019 |
| DELTASEAL 0855966 · TMA592402 | Selig Sealing Products, Inc. (a Delaware Corporation) | 20 Furniture | Registered | 2003 |
| DELTACONX 2195155 | Owner not shown | 9 Electronics35 Advertising36 Finance+1 | Pending | 2022 |
| Delidigi 2127052 · TMA1210829 | SHEN ZHEN GE YI TECHNOLOGY CO. LTD | 9 Electronics | Registered | 2023 |
| DELYTACT 2126784 · TMA1243814 · design | Daiichi Sankyo Company, Limited | 5 Pharmaceuticals | Registered | 2024 |
| DUALITEAS 2063630 · TMA1156343 · design | an individual | 30 Coffee | Registered | 2022 |
| DEALDIG 1928039 · TMA1049866 | Shenzhen Beijiale E-Commerce Co. Ltd | 7 Machines11 Lighting12 Vehicles | Registered | 2019 |
| DALTOCAST 1881552 · TMA1083540 | Huntsman International LLC | 17 Rubber | Registered | 2020 |
| DEALDIG 1873049 · TMA1067664 | Shenzhen Beijiale E-Commerce Co. Ltd | 9 Electronics35 Advertising | Registered | 2020 |