| TWP Digital Consulting Ltd | Information & communication | 2026 |
| TWT Consultancy Services Limited | Information & communication | 2023 |
| Twyford 64 Ltd | Real estate | 2021 |
| TWZ Property Ltd | Real estate | 2026 |
| TX3 Solutions Limited | Information & communication | 2001 |
| TY Coffi Coffee House Limited | Hospitality | 2025 |
| TYE Architects Ltd | Professional & scientific | 2019 |
| Tynant Holding Ltd | Financial services | 2026 |
| Typepart Limited | Wholesale & retail | 1999 |
| Tyres Direct (Bedford) Limited | Wholesale & retail | 2013 |
| Tyres Direct On-Line Limited | Wholesale & retail | 2008 |
| Tyrese Care Services Limited | Health & social care | 2019 |
| Tyretrek Ltd | Manufacturing | 2025 |
| Tyse Design & Consultancy Limited | Professional & scientific | 2016 |
| U Love Mocktails Limited | Wholesale & retail | 2026 |
| U R UN Limited | Wholesale & retail | 2018 |
| U-Knight Limited | Administrative & support | 2009 |
| U-Marq (Bedford) Limited | Professional & scientific | 2021 |
| U.C. (Sealed Units) Limited | Manufacturing | 2018 |
| U.K Tents Limited | Wholesale & retail | 2021 |
| U.K. Branch Ltd. | Professional & scientific | 2019 |
| U.R.S. Constructions Ltd | Manufacturing | 2018 |
| U.V.V. Ltd | Transport & logistics | 2023 |
| Uada Ltd | Construction | 2025 |
| Ubakie Concepts Limited | Health & social care | 2016 |
| Ubeauty Packaging Ltd | Professional & scientific | 2020 |
| Ubid Auctions Limited | Wholesale & retail | 2009 |
| Ubidonline Auctions Limited | Wholesale & retail | 2009 |
| UBM Services Ltd | Professional & scientific | 2022 |
| UDY Services Limited | Transport & logistics | 2015 |
| UES Properties Limited | Real estate | 2018 |
| UG Prop Ltd | Real estate | 2026 |
| UHF Solutions Limited | Construction | 2012 |
| Uhuru Empress Limited | Wholesale & retail | 2025 |
| UK Academics and Guardianship Ltd | Education | 2014 |
| UK Build Group Limited | Construction | 2025 |
| UK Business and Compliance Consultants Ltd. | Professional & scientific | 2015 |
| UK Business Products and Services Limited | Professional & scientific | 2026 |
| UK Community Radio Network CIC | Other services | 2021 |
| UK Comping Limited | Arts & recreation | 2016 |
| UK Computing Limited | Information & communication | 2005 |
| UK Footwear Ltd | Wholesale & retail | 2016 |
| UK Glam and Glow Limited | Other services | 2024 |
| UK Golf Course Owners Association Limited | Arts & recreation | 2008 |
| UK Graded Stock Limited | Wholesale & retail | 2011 |
| UK Herbex Ltd | Agriculture & fishing | 2024 |
| UK Linen House Ltd | Wholesale & retail | 2024 |
| UK Orchids Ltd | Real estate | 2023 |
| UK Software Services Ltd | Wholesale & retail | 2024 |
| UK Sports Products Limited | Wholesale & retail | 2004 |
| UK Super Shine Limited | Wholesale & retail | 2018 |
| UK V&V Ltd | Construction | 2015 |
| UK Waste Management Solutions Limited | Extraterritorial | 2013 |
| UK Weed Control Ltd | Administrative & support | 2025 |
| Ukag Russell Ltd | Education | 2020 |
| Ukcan PT Ltd | Health & social care | 2021 |
| Ukcf Action Limited | Arts & recreation | 2020 |
| Ukcf International Limited | Arts & recreation | 2017 |
| Ukcric Services Limited | Professional & scientific | 2022 |
| Ukit Solutions Limited | Wholesale & retail | 2025 |
| Ukprinterink Limited | Wholesale & retail | 2024 |
| Ukraini AID Ltd | Transport & logistics | 2025 |
| Ukrainian Heritage & Learning Hub CIC | Education | 2026 |
| ULA Cars Ltd | Wholesale & retail | 2025 |
| ULA Transport Ltd | Transport & logistics | 2023 |
| Ullswater Court Management Company Ltd | Real estate | 2018 |
| Ultimate BEAUTY14 Limited | Other services | 2020 |
| Ultimate K9 Ltd | Agriculture & fishing | 2015 |
| Ultimate Roofcare Ltd | Construction | 2025 |
| Ultra Mechanix Ltd | Wholesale & retail | 2013 |
| Ultra Mechanix VAG Ltd | Administrative & support | 2020 |
| Ultra Perfection Ltd | Other services | 2018 |
| Ultra Phase Construction Ltd | Construction | 2019 |
| Ultra Phase Investment Group Ltd | Financial services | 2024 |
| Ultra Precision Engineering (Bedford) Limited | Manufacturing | 2007 |
| Ultradisk Holdings Limited | Financial services | 2021 |
| Ultradisk Limited | Real estate | 1995 |
| Ultrarecycle Ltd | Water & waste | 1992 |
| Ultratec (Holdings) Limited | Financial services | 2013 |
| Ultratec Limited | Other services | 1996 |
| Ultratest Solutions Limited | Other services | 2018 |
| ULV Holdings Limited | Professional & scientific | 2023 |
| Umaga RO Ltd | Construction | 2025 |
| Umbrella Connect P Ltd | Administrative & support | 2025 |
| Umbrella Environmental Limited | Professional & scientific | 2021 |
| Umbrella Real Estate Limited | Real estate | 2023 |
| Umbria Download Limited | Hospitality | 2013 |
| Un:Ted Dance Collective Ltd | Arts & recreation | 2022 |
| Unbeatable Dreams Limited | Professional & scientific | 2022 |
| Unbranded Drinks Ltd | Wholesale & retail | 2020 |
| Under Maintenance Limited | Real estate | 2019 |
| Under the Lights Electrical Ltd | Construction | 2021 |
| Underpin Ltd | Arts & recreation | 2011 |
| Understanding Your Eating Limited | Education | 2008 |
| Underwood House Management Company Limited | Households | 1989 |
| Undisputed Promotions Limited | Arts & recreation | 2022 |
| Unge Group FH Ltd | Real estate | 2025 |
| Unge Group Limited | Real estate | 2022 |
| Unge Properties Ltd | Real estate | 2019 |
| Unge SWV Ltd | Real estate | 2025 |