| Tyres Near ME Ltd | Wholesale & retail | 2024 |
| Ulster Property Sales | Real estate | 1965 |
| Umac Systems UK Limited | Wholesale & retail | 2017 |
| Uniqueyachts Ltd | Manufacturing | 2025 |
| Universal Goodwill Company Limited | Financial services | 2010 |
| Unleashed Films Ltd | Professional & scientific | 2020 |
| UP & UP (N.I.) Limited | Manufacturing | 2013 |
| Urban (MAC) Ltd | Financial services | 2019 |
| Urban (Struc) Ltd | Real estate | 2020 |
| Urban International Trading Ltd | Wholesale & retail | 2024 |
| Urban Orchard Ltd | Wholesale & retail | 2011 |
| Urban Property (Holdings) Ltd | Financial services | 2022 |
| Urban Pulse (Gateway) Limited | Real estate | 2016 |
| Urban Pulse (Quayside) Ltd | Construction | 2022 |
| Urban Pulse (Thornhill) Ltd | Construction | 2014 |
| Urban Pulse (WIN) Limited | Extraterritorial | 2001 |
| Urban Pulse Ampm Limited | Financial services | 2022 |
| Urban Pulse Warwick Ltd | Real estate | 2018 |
| Urbicon Developments Limited | Real estate | 2006 |
| Uxbridge RD Investments Limited | Real estate | 2022 |
| Uzel Builders Ltd | Construction | 2026 |
| Vacarda Design Ltd | Construction | 2021 |
| Vaccine Injured and Bereaved Support NI Limited | Professional & scientific | 2024 |
| Valverde Developments Limited | Real estate | 2024 |
| Valverde Investments Limited | Real estate | 2024 |
| Vaughan Consult Limited | Professional & scientific | 2022 |
| Velo Yelo Limited | Administrative & support | 2018 |
| Vermont Properties Limited | Extraterritorial | 2007 |
| Verve Medical Aesthetics Ltd | Health & social care | 2014 |
| VET to YOU Ltd | Professional & scientific | 2025 |
| Victoria 1 Ltd | Hospitality | 2014 |
| Victoria 2 Ltd | Hospitality | 2017 |
| Victoria 3 Ltd | Hospitality | 2023 |
| Village Court Moira Management Limited | Households | 2006 |
| Village First Ltd | Hospitality | 2019 |
| Vincent Properties (N.I.) Limited | Professional & scientific | 2007 |
| Voxbot Ltd | Information & communication | 2025 |
| W.F. Carrick Developments Limited | Extraterritorial | 2011 |
| W.J. Fitzpatrick & Co Ltd | Professional & scientific | 2014 |
| Waddell Media (Bmeh) Limited | Information & communication | 2024 |
| Wallace Accounting and Consultancy Limited | Professional & scientific | 2020 |
| Wandsworth Properties (Belfast) Limited | Real estate | 1960 |
| Warren Projects Limited | Construction | 2019 |
| Water N.I. Ltd. | Professional & scientific | 2011 |
| Waterloo Anaesthesia Limited | Health & social care | 2022 |
| Wayford Properties Limited | Households | 1989 |
| WE ARE IQ Limited | Other services | 2022 |
| WE ARE Tiger Tots Limited | Health & social care | 2012 |
| Wealth IQ Limited | Financial services | 2024 |
| Wealthcare (Ireland) Limited | Extraterritorial | 2002 |
| Wearesó Ltd | Construction | 2025 |
| WFX Belfast Road LLP | | 2020 |
| WFX Contracts Limited | Real estate | 2016 |
| WFX Group Limited | Financial services | 2024 |
| WFX Hospitality Limited | Real estate | 2022 |
| WFX Hospitality Partners 004 LLP | | 2024 |
| WFX Hospitality Partners 005 LLP | | 2024 |
| WFX Hospitality Partners 006 LLP | | 2018 |
| WFX Hospitality Partners 007 LLP | | 2024 |
| WFX Hospitality Partners 008 LLP | | 2024 |
| WFX Hospitality Propco 004 Limited | Real estate | 2023 |
| WFX Living Limited | Real estate | 2023 |
| WFX Living Partners 001 LLP | | 2017 |
| WFX Office Limited | Real estate | 2023 |
| WFX Partners Limited | Real estate | 2024 |
| WFX Real Estate Partners 001 LLP | | 2022 |
| WFX Real Estate Partners 002 LLP | | 2023 |
| WFX Real Estate Partners 003 LLP | | 2024 |
| WFX Real Estate Partners 011 LLP | | 2025 |
| Wickology Limited | Wholesale & retail | 2016 |
| Willa Empower Ltd | Professional & scientific | 2021 |
| William Clark & Sons Holdings Limited | Real estate | 1913 |
| William Wilson C.A. Limited | Professional & scientific | 2020 |
| Willowbank Gardens Management Company Ltd | Households | 2007 |
| Wilson Family Construction Limited | Real estate | 2010 |
| Wilson Family Investments Limited | Real estate | 2010 |
| Wilson Family Offices Limited | Real estate | 2012 |
| Wilson Sloan Consulting Ltd | Professional & scientific | 2013 |
| Winshill Limited | Real estate | 2019 |
| Wirefox Carry Limited | Real estate | 2016 |
| Wirefox Castle Limited | Real estate | 2017 |
| Wirefox Castle Property Limited | Real estate | 2017 |
| Wirefox City Park Limited | Real estate | 2017 |
| Wirefox Design Limited | Professional & scientific | 1999 |
| Wirefox Downshire Limited | Real estate | 2014 |
| Wirefox Holding Company | Professional & scientific | 2015 |
| Wirefox Management Limited | Real estate | 2017 |
| Wirefox Ormiston Limited | Real estate | 2015 |
| Wirefox Real Estate LLP | | 2020 |
| Wirefox Services Limited | Real estate | 2013 |
| Wirefox Tobacco Works Limited | Real estate | 2015 |
| Wirefox Tobacco Yard Limited | Real estate | 2017 |
| Women in Saas Limited | Other services | 2023 |
| Woodbank Ventures Ltd | Professional & scientific | 2019 |
| Woodbrook Management Company (Northern Ireland) Limited | Households | 2008 |
| Wright & Ringo Limited | Arts & recreation | 2022 |
| XDI Advisory Limited | Information & communication | 2018 |
| Xprosportsmanagement Ltd | Arts & recreation | 2019 |
| Y3 BNR Limited | Real estate | 2025 |
| Y3 Care Limited | Construction | 2024 |