| Worldwide Scaffold and Access Limited | Construction | 2017 |
| Worldwide Unlimited Business Ltd | Professional & scientific | 2020 |
| Wound Plus Ltd | Professional & scientific | 2025 |
| WPL Properties Ltd | Real estate | 2026 |
| WR Norfolk Developments Ltd | Construction | 2021 |
| Wred Limited | Administrative & support | 2020 |
| Wright and Long Ltd. | Construction | 2002 |
| Wright Property Associates Ltd | Professional & scientific | 2012 |
| Wrightarch Properties and Holdings Limited | Real estate | 2026 |
| Wrightstunts Ltd | Arts & recreation | 2010 |
| Writenote Communications Ltd | Professional & scientific | 2023 |
| Wroxham Leisure Limited | Arts & recreation | 2001 |
| WW Holidays Ltd | Hospitality | 2016 |
| WW Properties (East Anglia) Limited | Construction | 2016 |
| Wxve Productions Ltd | Information & communication | 2018 |
| Wythe Property Limited | Other services | 2020 |
| Xcell Property Maintenance (East Anglia) Ltd | Construction | 2023 |
| XEN Arts | Arts & recreation | 2009 |
| Xirtam Assets Limited | Financial services | 2020 |
| Xirtam Private Finance Limited | Financial services | 2019 |
| Xlnt Electrical Ltd | Construction | 2021 |
| Xphase Ltd | Professional & scientific | 2023 |
| XPS Group Ltd | Transport & logistics | 2018 |
| Xtraclean Limited | Professional & scientific | 2002 |
| Xtraspecial Ltd | Other services | 2019 |
| XV Estates Ltd | Real estate | 2024 |
| XV Holdings Ltd | Financial services | 2024 |
| XV Property Ltd | Construction | 2024 |
| Yacob TM Ltd | Construction | 2024 |
| Yallops Holdings Limited | Financial services | 2019 |
| Yarka-Uk Limited | Wholesale & retail | 2022 |
| YE Olde Bakery Ltd | Manufacturing | 2020 |
| Yelland Motor and Metal Ltd | Professional & scientific | 2026 |
| Yellow Rose Wellness Ltd | Health & social care | 2023 |
| Yellowlawn Investments Ltd | Wholesale & retail | 2016 |
| Yeltram Ltd | Transport & logistics | 2023 |
| Yetop Limited | Wholesale & retail | 2026 |
| Yiewsley Waterside Limited | Real estate | 2018 |
| Yoke Wellness Limited | Arts & recreation | 2025 |
| Youbuild Construction Ltd | Construction | 2019 |
| Young Turkish Productions Limited | Information & communication | 2025 |
| YOUNICK4 Ltd | Transport & logistics | 2019 |
| Your Dream BAG Limited | Arts & recreation | 2023 |
| Your Roof Services Limited | Construction | 2025 |
| Your Villiage Pump Limited | Information & communication | 2021 |
| Yoxford Court Residents Association Limited | Other services | 1974 |
| Yusuf Properties 1 Ltd | Real estate | 2025 |
| Zaibo Ratai Ltd | Transport & logistics | 2025 |
| Zakariah Spice Ltd | Hospitality | 2026 |
| Zalkam Medical Ltd | Health & social care | 2025 |
| Zanzi Corp Ltd | Wholesale & retail | 2025 |
| Zarél Sports Clothing Limited | Wholesale & retail | 2025 |
| ZBC Haulage Limited | Transport & logistics | 2014 |
| Zerbo Ltd | Information & communication | 2022 |
| Zerosion Limited | Construction | 2019 |
| Zeta Consultancy Limited | Information & communication | 2018 |
| Ziebart Joinery Ltd | Other services | 2019 |
| ZP VP Euro Import Limited | Wholesale & retail | 2020 |
| Zubalis Ltd | Information & communication | 2023 |