| D&A, Inc. | California |
| D&D Integrated Solutions, Inc. | California |
| D&F Consultancy, Inc. | |
| D&GG, LLC | |
| D&H Distributing Co. | Pennsylvania |
| D&S Communications, Inc. | Illinois |
| D&S Global Solutions | Texas |
| D'Antonio Technologies, LLC | Louisiana |
| d'Vinci Interactive, LLC | |
| D'Youville College | New York |
| D-ID | Delaware |
| d-Matrix | California |
| d-Matrix | |
| D-Signs | California |
| D-Tech Media, LLC | Minnesota |
| D-tools | California |
| D-Wave Quantum, Inc. | |
| D. Cohn Digital Consulting | |
| D. E. Hokanson, Inc. | |
| D. Halstead Design | Georgia |
| D. Lane Media | Colorado |
| D.E. Shaw & Co., L.P. | |
| D.E. Shaw Research | |
| D.H. Labs, Inc. | Florida |
| D.H.D'Urso & Associates | California |
| D.O. Software | Minnesota |
| D1 International.com | New York |
| D2 Agency | |
| D2 Branding of Tulsa | |
| D2 Creative | |
| D2 Creative, LLC | |
| D2 Technologies, Inc. | California |
| d2im | Virginia |
| D2iQ, Inc. | California |
| D2S, Inc. | California |
| D2Sol | North Carolina |
| D2Strategy | |
| D2Xchange, LLC | Colorado |
| D3 | Maryland |
| D3 Global, Inc. | |
| D3 Web Design | Pennsylvania |
| D3Publisher of America, Inc. | California |
| D3Sciences | |
| D3V Technology Solutions | Texas |
| D4 Advanced Media | Nevada |
| D4H Technologies Ltd | |
| D6 Industries, Inc. | Massachusetts |
| Da Vinci Unified, Inc. | |
| Da Zen Theranostics, Inc. | |
| DAAKE | Nebraska |