| U.S. Trust, Bank of America Private Wealth Management | 🍎 | 1 | 4.6★ | Finance |
| U1 Game Digital Entertainment(HongKong) Co.,Ltd. | 🍎 | 1 | 4.6★ | Games |
| UAB 360 Mind | 🍎 | 1 | 4.3★ | Education |
| UAB Clear White Technologies | 🍎 | 1 | 4.5★ | Finance |
| UAB FlowTech Pro | 🍎 | 1 | 4.4★ | Entertainment |
| UAB MN Technologijos | 🍎 | 1 | 4.7★ | Utilities |
| UAB Pulsetto | 🍎 | 1 | — | LIFESTYLE |
| UAB ZEN.COM | 🍎 | 1 | 4.8★ | Finance |
| UAL | 🍎 | 1 | 4.8★ | Lifestyle |
| UASidekick Inc | 🍎 | 1 | 3.5★ | Reference |
| UB Leisure (Pty) Ltd | 🍎 | 1 | — | Lifestyle |
| UBAID ULLAH IKRAM | 🍎 | 1 | 5.0★ | Productivity |
| UBC Holding Corp | 🍎 | 1 | — | Shopping |
| UBER | 🍎 | 1 | 4.0★ | Travel |
| UBI MEDIA FZE LLC | 🍎 | 1 | 4.5★ | Photo & Video |
| UBIMET | 🍎 | 1 | 2.5★ | Weather |
| UBLSOFTWARE | 🍎 | 1 | — | Productivity |
| UBOOKER WORLDWIDE LTD | 🍎 | 1 | — | Business |
| UBS APP | 🍎 | 1 | — | Productivity |
| UBUY COMPANY FOR DESIGNING AND MANGING WEBSITES | 🍎 | 1 | 4.2★ | Shopping |
| UC Davis Health System | 🍎 | 1 | 4.5★ | Medical |
| UC-pay Canada Ltd | 🍎 | 1 | 5.0★ | Finance |
| UCAPPS LLC | 🍎 | 1 | 4.2★ | Business |
| UCB | 🍎 | 1 | — | Education |
| UCB Fintech Company Limited | 🍎 | 1 | 3.5★ | Finance |
| UCHealth | 🍎 | 1 | 3.0★ | Health & Fitness |
| UCO BANK | 🍎 | 1 | 3.2★ | Finance |
| UCPlaces LLC | 🍎 | 1 | 3.9★ | Travel |
| UCWEB SINGAPORE PTE. LTD. | 🍎 | 1 | 4.4★ | Utilities |
| UCYOL DAYANIKLI TUKETIM TEKSTIL VE ANONIM AS | 🍎 | 1 | 5.0★ | Utilities |
| UDAYA TECHNOLOGY CO., LTD | 🍎 | 1 | 3.9★ | Utilities |
| UDisc LLC | 🍎 | 1 | 4.9★ | SPORTS |
| UEM Sunrise Berhad | 🍎 | 1 | — | Business |
| UES, L.LC. | 🍎 | 1 | 4.7★ | Food & Drink |
| UFC® - The Ultimate Fighting Championship® | 🍎 | 1 | — | SPORTS |
| UFI PTE. LTD. | 🍎 | 1 | 4.8★ | Finance |
| UFO MOVIEZ INDIA LTD | 🍎 | 1 | 4.5★ | Entertainment |
| UGMK-ZDOROVE, OOO | 🍎 | 1 | 4.7★ | Medical |
| UGOCHUKWU UWAKWE | 🍎 | 1 | — | Food & Drink |
| UGT TECHNOLOGIES LTD | 🍎 | 1 | 2.6★ | Finance |
| UGUR DALKIRAN | 🍎 | 1 | — | Health & Fitness |
| UGroupMedia inc | 🍎 | 1 | 4.8★ | Entertainment |
| UHAPP, LLC | 🍎 | 1 | 5.0★ | Sports |
| UHS Pty Ltd | 🍎 | 1 | 3.1★ | Utilities |
| UICASDE HopeMedia | 🍎 | 1 | 5.0★ | Education |
| UIT Ciudad Real | 🍎 | 1 | — | Medical |
| UK Citi Ltd | 🍎 | 1 | — | Business |
| UK ETA Office | 🍎 | 1 | 4.8★ | Travel |
| UK-PLUS SECURITY & SURVEILLANCE SERVICES LLC | 🍎 | 1 | 4.4★ | Utilities |
| UKClimbing Limited | 🍎 | 1 | 3.7★ | Sports |