| Wtttl Ltd | Construction | 2022 |
| Wudu Properties Limited | Real estate | 2017 |
| Wuji Studios Ltd | Manufacturing | 2024 |
| Wulfric Aarne Racing Ltd | Agriculture & fishing | 2024 |
| Wunderhaas Ltd | Wholesale & retail | 2020 |
| Wurr Power Ltd | Arts & recreation | 2018 |
| WV14 Ltd | Real estate | 2015 |
| Wwii Air Sea Rescue Trust (the) | Other services | 2025 |
| WWP (EA) Limited | Extraterritorial | 2017 |
| WWS Plumbing and Heating Limited | Construction | 2013 |
| Www.Nakedwines.Com Limited | Wholesale & retail | 2008 |
| Wyatt Gervasio Consulting Limited | Professional & scientific | 2017 |
| Wyber Consulting Ltd | Professional & scientific | 2018 |
| Wyevalleycatering Ltd | Hospitality | 2022 |
| Wymondham BG Ltd | Other services | 2014 |
| Wymondham Garden Centre Ltd | Agriculture & fishing | 2005 |
| Wymondham NR18 Limited | Construction | 2024 |
| Wymondham Tile Centre Limited | Wholesale & retail | 2017 |
| Wymondham Tyre Services Ltd | Wholesale & retail | 2008 |
| Wymondham Vehicle Services Ltd | Wholesale & retail | 2021 |
| Wynnedolini Property Limited | Real estate | 2024 |
| Wyrd Pixel Ltd | Information & communication | 2025 |
| Wyrdkin Studios Ltd | Arts & recreation | 2026 |
| WZA Music Ltd | Information & communication | 2021 |
| X Adventure Activities Ltd | Education | 2010 |
| X Adventure CIC | Education | 2025 |
| X Tron Live Ltd | Health & social care | 2024 |
| X-Press Legal Services (Norfolk) Limited | Administrative & support | 2009 |
| X20 Solar Limited | Construction | 2023 |
| Xadrum Ltd | Information & communication | 2016 |
| Xanadu Business Solutions Ltd | Professional & scientific | 2016 |
| Xavi Energy Limited | Professional & scientific | 2017 |
| Xavi Group Limited | Real estate | 2017 |
| Xavi Management Limited | Real estate | 2020 |
| Xavi Properties Limited | Real estate | 2019 |
| Xcel Property Services (UK) Ltd | Households | 2007 |
| Xcom Associates Ltd | Professional & scientific | 2016 |
| Xelagem Limited | Real estate | 2020 |
| Xelorate Ltd | Information & communication | 2015 |
| Xenan Holdings Ltd | Wholesale & retail | 2015 |
| Xenial Automobile Limited | Wholesale & retail | 2026 |
| Xenial Care Limited | Health & social care | 2024 |
| Xenial Intelligence Limited | Information & communication | 2025 |
| Xentos Consultants Ltd | Professional & scientific | 2016 |
| Xeonic Ltd | Information & communication | 2021 |
| XI Garments Ltd | Construction | 2023 |
| Xing Long 888 Ltd | Hospitality | 2026 |
| Xixi Records Limited | Information & communication | 2025 |
| Xlwerks Limited | Information & communication | 2019 |
| Xone Distribution Ltd | Wholesale & retail | 2011 |
| Xoxo Homes Ltd | Real estate | 2025 |
| Xp-Vr Ltd | Wholesale & retail | 2018 |
| Xpert Computer Services Ltd | Administrative & support | 1998 |
| Xpert Psychology Group Ltd | Health & social care | 2023 |
| Xpert Services Limited | Hospitality | 2018 |
| Xploiterrsec Limited | Information & communication | 2026 |
| Xprogramme Services Limited | Professional & scientific | 2016 |
| Xqrc Ltd | Information & communication | 2009 |
| Xscape Staycations Limited | Hospitality | 2022 |
| Xtra Exterior Cleaning Services Limited | Administrative & support | 2025 |
| Xtra Garden Services Limited | Administrative & support | 2025 |
| Xtra Property Maintenance Limited | Construction | 2024 |
| Xtra Space (Great Yarmouth) Limited | Administrative & support | 2007 |
| Xuria Limited | Professional & scientific | 2019 |
| Xxxvii Ltd | Financial services | 2021 |
| Xynode Gaming Ltd | Information & communication | 2019 |
| XYZ Catering Ltd | Hospitality | 2022 |
| Xzonetrading Limited | Wholesale & retail | 2017 |
| Y L Trading (Norwich) Ltd | Wholesale & retail | 2020 |
| Y NOT Woodknot Limited | Financial services | 2025 |
| Yachting Experience Ltd | Arts & recreation | 2006 |
| Yachtwork Training Ltd | Professional & scientific | 2019 |
| Yafhad Ltd | Real estate | 2025 |
| YAK85 Limited | Hospitality | 2025 |
| Yakbit Ltd | Information & communication | 2021 |
| Yakinori Grand Central Ltd | Hospitality | 2017 |
| Yakinori Holdings Ltd | Hospitality | 2005 |
| Yala Habibi Ltd | Hospitality | 2025 |
| Yaldiz Properties Ltd | Real estate | 2022 |
| Yamama Transport Ltd | Transport & logistics | 2023 |
| Yamel Ltd. | Wholesale & retail | 1998 |
| Yana Healthcare Ltd | Administrative & support | 2024 |
| Yanai Health Limited | Health & social care | 2023 |
| Yang Sing Pharma Ltd | Manufacturing | 2020 |
| Yanis Support and Care Provision Ltd | Health & social care | 2018 |
| Yaqeen Services Limited | Wholesale & retail | 2026 |
| Yard Norwich Limited | Manufacturing | 2021 |
| Yard Productions Limited | Information & communication | 2003 |
| Yard Properties Ltd | Real estate | 2016 |
| Yare Accountancy Services Limited | Professional & scientific | 2014 |
| Yare Boat Club Limited | Arts & recreation | 2019 |
| Yare Business Solutions Limited | Professional & scientific | 2022 |
| Yare East Ltd | Real estate | 2022 |
| Yare Electrical Services Ltd | Construction | 2004 |
| Yare Investments Ltd | Real estate | 2010 |
| Yare Solar Limited | Construction | 2022 |
| Yare View Holiday Cottages Limited | Hospitality | 2022 |
| Yaregrain PLC | Agriculture & fishing | 2010 |
| Yarehill Properties Limited | Real estate | 2021 |
| Yarmouth Road Limited | Construction | 2023 |