| Ultra Electronics ICE, Inc. | Kansas |
| Ultra Fractal | Florida |
| Ultra Labs, LLC | |
| Ultra Mobile | New York |
| Ultra Optics | Minnesota |
| Ultra SEO Solutions | California |
| Ultra Web Hosting | Washington |
| Ultra, Inc. | |
| Ultra-Violet Laser Supplies, Inc. | Virginia |
| Ultra-X, Inc. | California |
| UltraBac Software | Washington |
| Ultrabit | California |
| UltraCAD Design, Inc. | Washington |
| UltraCart Ecommerce | Georgia |
| Ultradata Research, Inc. | |
| UltraEdit | Ohio |
| Ultragenyx Pharmaceutical, Inc. | |
| UltraHost | |
| UltraLevel | Michigan |
| Ultralife Corporation | New York |
| Ultralytics, Inc. | |
| Ultramain Systems, Inc. | New Mexico |
| UltraSMSScript.com | Illinois |
| Ultratec, Inc. | Wisconsin |
| Ultraviolet Analytics | |
| Ultron Systems, Inc. | California |
| Ulu Ventures | California |
| UM Ventures | Maryland |
| UMA Instruments | Virginia |
| Umajin, Inc. | |
| uMake, Inc. | California |
| Umami Software, Inc. | California |
| Umano Medical, Inc. | |
| UMass Chan Medical School | Massachusetts |
| UMAX | Texas |
| UMB Financial Corporation | |
| UMBC Training Centers | Maryland |
| Umbo Computer Vision, Inc. | California |
| Umbra Hosting | Wisconsin |
| Umbra Lab, Inc. | California |
| Umbrella Global Risk Consulting, LLC | New Jersey |
| Umbrella Technologies | Illinois |
| Umetech | |
| UmeWorks, LLC | California |
| uMobi Solutions Corporation | |
| Umoja Biopharma | |
| Umojo, Inc. | Illinois |
| Un-branded, LLC | |
| Un1teee | |
| Unabridged Software | Nebraska |