| Unleashed Creations Ltd | Arts & recreation | 2024 |
| Unspoken Emotions Ltd | Education | 2025 |
| Untoldtcg Limited | Wholesale & retail | 2025 |
| Unwind Beauty Therapy Ltd | Other services | 2024 |
| Upgrade Property Limited | Real estate | 2020 |
| Uplands Bar Management Ltd | Hospitality | 2020 |
| Uplands Breakfast Limited | Hospitality | 2025 |
| Uplands Car Radios Ltd | Wholesale & retail | 2016 |
| Uplands DS Ltd | Health & social care | 2023 |
| Uplands Eatery Ltd | Financial services | 2014 |
| Uplands Food for YOU Limited | Hospitality | 2018 |
| Uplands Group Limited | Professional & scientific | 2008 |
| Uplands Installation and Construction Ltd | Construction | 2016 |
| Uplands Kitchens Limited | Construction | 2018 |
| Uplands Onetelco Ltd | Wholesale & retail | 2000 |
| Uplands Parking OPS Ltd | Other services | 2020 |
| Uplands Piri Piri Ltd | Hospitality | 2025 |
| Upnsmoke Ltd | Wholesale & retail | 2024 |
| Upper Bank Court Management Company Limited | Households | 2023 |
| Upright Scaffolding (Wales) Limited | Construction | 2024 |
| Uprise Print Limited | Manufacturing | 2013 |
| Upscale Construction Group Ltd | Construction | 2020 |
| Urban Dozing Ltd | Hospitality | 2022 |
| Urban Expansion Ltd | Construction | 2013 |
| Urban Exposure Investment Management LLP | | 2015 |
| Urban Foundry Ltd. | Administrative & support | 2008 |
| Urban Haus Investments Limited | Construction | 2020 |
| Urban Padz Ltd | Hospitality | 2025 |
| Urban Property Developments (South Wales) Ltd | Construction | 2019 |
| Urban Property Group Limited | Construction | 2018 |
| Urban Scribble Limited | Information & communication | 2009 |
| Urban Shared Ltd | Real estate | 2019 |
| Urban Spa Limited | Other services | 2024 |
| Urban Spaces Limited | Real estate | 2002 |
| Urbanmiles Limited | Transport & logistics | 2025 |
| User Fusion Limited | Information & communication | 2006 |
| Usphotography Ltd | Professional & scientific | 2023 |
| Ustura Ltd | Other services | 2023 |
| Utopian Services Limited | Administrative & support | 2004 |
| Uwcb Swansea Limited | Arts & recreation | 2017 |
| V & C (SW) Limited | Construction | 2011 |
| V & C (SW) Properties Limited | Construction | 2013 |
| V and D Properties Ltd | Construction | 2023 |
| V B Griffiths (Building & Roofing) Limited | Construction | 2002 |
| V&A Management Services Limited | Households | 2003 |
| V-Twin Audio Ltd | Information & communication | 2014 |
| V.I.B.E Youth CIC | Health & social care | 2017 |
| V3 Accounting Solutions Limited | Professional & scientific | 2020 |
| V3 Logistics Ltd | Professional & scientific | 2018 |
| Vacaybud Ltd | Information & communication | 2023 |
| Vale & Country Limited | Financial services | 2018 |
| Vale and Valley Mortgages Ltd | Financial services | 2025 |
| Vale Car & Van Rental Ltd | Administrative & support | 2021 |
| Vale Joinery Ltd | Manufacturing | 2022 |
| Vale Manufacturing Ltd | Administrative & support | 2015 |
| Vale of Neath Community Leisure Limited | Arts & recreation | 2022 |
| Valenda Holdings Limited | Real estate | 2025 |
| Valentina Rosa Ltd | Wholesale & retail | 2024 |
| Valentino's Pizza (Llanelli) Ltd | Hospitality | 2024 |
| Valet Master Limited | Professional & scientific | 2002 |
| Valkyrie Construction Services Ltd | Construction | 2019 |
| Valley Engraving Limited | Manufacturing | 1982 |
| Valley Fit Ltd | Health & social care | 2025 |
| Valley Heating & Plumbing Ltd | Construction | 2020 |
| Valley Management Group Limited | Real estate | 2022 |
| Valley Mill Ltd | Manufacturing | 2007 |
| Valley Renewables Engineering Ltd | Professional & scientific | 2024 |
| Valley Way Management Company Limited(The) | Real estate | 1986 |
| Valleypet Limited | Real estate | 1985 |
| Valleys and Vale Property Limited | Real estate | 2015 |
| Vamenterprises Ltd | Wholesale & retail | 2024 |
| Vampire One Films Ltd | Information & communication | 2018 |
| Van Fit Ltd | Other services | 2016 |
| Vance Management Ltd | Real estate | 2025 |
| Vanewood Court Management Company Limited | Households | 2015 |
| Vanguard Investment Group Ltd | Real estate | 2023 |
| Vanguard Security Services VSS Ltd | Administrative & support | 2025 |
| Vanilla Public Relations Limited | Professional & scientific | 2007 |
| Vanity Lounge Ltd | Other services | 2016 |
| Vanity Wholesalers Limited | Wholesale & retail | 2024 |
| Vanityhairxtensions Ltd | Wholesale & retail | 2019 |
| Vanplus Leisure Ltd | Wholesale & retail | 2009 |
| Vanric Ltd | Wholesale & retail | 2021 |
| Vantage Realty Developments Limited | Real estate | 2021 |
| Vantage Realty Solutions Limited | Real estate | 2020 |
| Vanton Limited | Hospitality | 2014 |
| Vantur Ltd | Wholesale & retail | 2025 |
| Vape 1 Hub Ltd | Wholesale & retail | 2025 |
| Vape UP N Shape UP Ltd | Wholesale & retail | 2023 |
| Vape Zone SW Ltd | Wholesale & retail | 2025 |
| Vapehq Castle Street Ltd | Wholesale & retail | 2025 |
| Vardre RFC Limited | Arts & recreation | 2015 |
| Vaughan Roofing & Scaffolding Ltd | Construction | 2020 |
| Vavas General Trading W.L.L Limited | Hospitality | 2025 |
| VAW Security Ltd | Administrative & support | 2024 |
| VBP Consultancy Limited | Professional & scientific | 2015 |
| Vcds Diagnostics Limited | Wholesale & retail | 2021 |
| Vecss Express Ltd | Wholesale & retail | 2022 |
| Veeboono Limited | Transport & logistics | 2014 |
| Veeboono Travel Limited | Transport & logistics | 2020 |