| UK Traveller Ltd | Administrative & support | 2005 |
| UK Trends Store Ltd | Wholesale & retail | 2024 |
| UK Voice Call Limited | Transport & logistics | 2013 |
| Ukay Properties Ltd | Financial services | 2018 |
| Ukbg Express Ltd | Transport & logistics | 2026 |
| Ukhe Consultants Ltd | Public administration | 2020 |
| Ukiye Ltd | Wholesale & retail | 2025 |
| Uknowsoft Technology Ltd | Information & communication | 2023 |
| Uloma Corporate Relocation Ltd | Hospitality | 2024 |
| Ultimate Hair & Beauty Co Limited | Wholesale & retail | 1998 |
| Ultimate Seller Ltd | Wholesale & retail | 2025 |
| Ultra Electrics Limited | Construction | 2006 |
| Umart Store Ltd | Wholesale & retail | 2024 |
| Umbrathax Ltd | Wholesale & retail | 2025 |
| Unbar Rothon Limited | Manufacturing | 1921 |
| UNI Shop Ltd | Wholesale & retail | 2023 |
| Unicorsolutions (UK) Ltd | Wholesale & retail | 2017 |
| Uniform Shoes Ltd | Wholesale & retail | 2013 |
| Unik Sales Service Limited | Wholesale & retail | 2007 |
| Unikem Ltd | Manufacturing | 2024 |
| Union Securities (International) Ltd | Financial services | 1995 |
| Unique Agency Ltd | Wholesale & retail | 2026 |
| Unique Constructions & Maintenance Ltd | Construction | 2020 |
| Unique Props Limited | Construction | 2019 |
| Unique Trading Limited | Wholesale & retail | 1981 |
| Uniquest Associates Limited | Health & social care | 2005 |
| Unisystems Freight (UK) Limited | Transport & logistics | 1990 |
| Unit 4 Motor Services Ltd | Wholesale & retail | 2018 |
| Unit One Studios Limited | Administrative & support | 2006 |
| United for Kids Foundation Ltd | Health & social care | 2010 |
| United Malt UK Limited | Manufacturing | 2009 |
| United Martial Arts Karate School Ltd | Education | 2019 |
| United Sourcing Ltd | Hospitality | 2013 |
| United Translators Ltd | Professional & scientific | 2005 |
| Uniting Friends Limited | Health & social care | 2008 |
| Universa Nova Limited | Wholesale & retail | 2026 |
| Universal (UK) Limited | Information & communication | 2003 |
| Universal Lofts Limited | Construction | 2004 |
| University Centre West Anglia | Education | 2007 |
| University of Essex Campus Services Limited | Hospitality | 1990 |
| University of Essex Enterprises Limited | Administrative & support | 1990 |
| University of Essex Knowledge Gateway Holdings Limited | Financial services | 2001 |
| Uniway Developments Limited | Real estate | 2004 |
| Unwins Engineering & Maintenance Ltd | Construction | 2018 |
| UP East Lofts Ltd | Construction | 2022 |
| Upgrade Skills Limited | Education | 2023 |
| Uplicon Limited | Information & communication | 2023 |
| UPM Village Ltd | Hospitality | 2024 |
| Upminster and City Limited | Professional & scientific | 1996 |
| Upminster Fire and Electrical Services Ltd | Construction | 2004 |
| Upminster Limited | Professional & scientific | 2006 |
| Uptel Limited | Financial services | 2006 |
| UR Care Services Ltd | Health & social care | 2023 |
| Urban IT Resource Limited | Information & communication | 2003 |
| Urban Publishing Limited | Information & communication | 2025 |
| Urban Rail Transportation Consultants Ltd | Construction | 2019 |
| Ursell Builders Limited | Construction | 2002 |
| Usfzm & Company Ltd | Construction | 2016 |
| Uthsob Limited | Administrative & support | 2023 |
| Uticolor Cambridge Limited | Manufacturing | 2003 |
| Utility Matters Limited | Administrative & support | 2007 |
| Utopia I T Services Limited | Professional & scientific | 2006 |
| Uttlesford Citizens Advice Bureau | Other services | 1999 |
| Uuniserve (UK) Limited | Administrative & support | 2024 |
| Uuniserve International Limited | Administrative & support | 2024 |
| V & H Heating & Electrical Services Limited | Administrative & support | 2019 |
| V & K Dukes Engineering & Fabrication Limited | Professional & scientific | 2007 |
| V and B Property Services Ltd | Real estate | 2022 |
| V F Farriery Limited | Other services | 2021 |
| V. N. Palmer Ltd. | Real estate | 2006 |
| V. Woodcock and Company (Insurance) Limited | Financial services | 1957 |
| V.J. Enterprise Ltd | Wholesale & retail | 2007 |
| Vacancy Ventures Ltd | Real estate | 2025 |
| Vagupdate Automotive Ltd | Wholesale & retail | 2025 |
| Val's Restoration Limited | Construction | 2020 |
| Valaw Ltd | Professional & scientific | 2023 |
| Valentine Lodge Ltd | Health & social care | 1999 |
| Valerie MAY Limited | Wholesale & retail | 2021 |
| Valex Solutions Ltd | Wholesale & retail | 2026 |
| Valorante Ltd | Wholesale & retail | 2025 |
| Valoryn Group Ltd | Professional & scientific | 2025 |
| Valto Management Ltd | Administrative & support | 2026 |
| Value Nest by Furqan Ltd | Wholesale & retail | 2026 |
| Valve Control Limited | Manufacturing | 2001 |
| Valvetech Limited | Manufacturing | 1997 |
| Vanda Estates (UK) Ltd | Real estate | 2005 |
| Vandy Consulting Limited | Health & social care | 2023 |
| Vanessa Holt Limited | Professional & scientific | 1989 |
| Vanquish First Ltd | Financial services | 2021 |
| Vapegen Tech London Ltd | Wholesale & retail | 2023 |
| Varahi Residence Limited | Construction | 2023 |
| Varr TM Ltd | Arts & recreation | 2026 |
| Vatsala Ltd | Financial services | 2025 |
| Vauxhall Turbo Spares Ltd | Wholesale & retail | 2025 |
| Vauxhall World Limited | Wholesale & retail | 2002 |
| Veco Foods UK Limited | Wholesale & retail | 1999 |
| Veerstyle Limited | Transport & logistics | 1982 |
| Vega Culture Media Co Ltd | Wholesale & retail | 2025 |
| Vegi-Thru Foods Limited | Wholesale & retail | 2026 |
| Vehicle Telematics Limited | Administrative & support | 1999 |