| Wozniak Beauty & Aesthetics Ltd | Health & social care | 2026 |
| WP Accounting 4 YOU Ltd | Professional & scientific | 2021 |
| WPS Service Ltd | Construction | 2013 |
| WR Business Management Services Limited | Professional & scientific | 2011 |
| WR Kupiec Trans Ltd | Transport & logistics | 2026 |
| WR Opticals Ltd | Wholesale & retail | 2024 |
| Wren Court (Peterborough) Management Company Limited | Households | 1995 |
| Wrencom Services Limited | Professional & scientific | 2024 |
| Wright Travel Ltd | Transport & logistics | 2025 |
| Wrighton Brooks Limited | Professional & scientific | 2011 |
| Write and Shine Limited | Education | 2014 |
| Write Justified Ltd | Professional & scientific | 2017 |
| Wrostow Automotive Ltd | Wholesale & retail | 2024 |
| Wryde Properties Ltd | Real estate | 2020 |
| WS Equine Agents Limited | Wholesale & retail | 2025 |
| Wsmd Leisure Limited | Arts & recreation | 2021 |
| WUDIS22 Ltd | Transport & logistics | 2025 |
| Wumzy Elegance Studio Ltd | Other services | 2024 |
| WW Tech Ltd | Wholesale & retail | 2023 |
| WWG Consulting Ltd | Information & communication | 2021 |
| Wwta Ltd | Professional & scientific | 2017 |
| WX Technical Solutions Ltd | Other services | 2023 |
| Wybeck Treading AS Sara Original Limited | Wholesale & retail | 2023 |
| Wyberton Developments Ltd | Real estate | 2025 |
| WYE & Howe Ltd | Professional & scientific | 2024 |
| WYE Accounting Limited | Professional & scientific | 2020 |
| Wykes Technology Limited | Information & communication | 2026 |
| Wymer Republic Investments Ltd | Administrative & support | 2021 |
| Wyndale Accommodation Ltd | Real estate | 2019 |
| Wyndham Development 102 Ltd | Construction | 2023 |
| WZD Partnerships Limited | Professional & scientific | 2010 |
| X Barr Ltd | Real estate | 2025 |
| X-Cite Consulting Services Ltd | Professional & scientific | 2017 |
| X-Zel Ltd | Wholesale & retail | 2025 |
| Xavier Analysis Limited | Administrative & support | 2005 |
| Xcore Sport Ltd | Wholesale & retail | 2026 |
| Xenmedia Marketing Limited | Professional & scientific | 2016 |
| Xenocyte Limited | Other services | 2003 |
| Xevion Ventures Limited | Hospitality | 2026 |
| XG Construction Ltd | Construction | 2017 |
| XII Factors Ltd | Information & communication | 2022 |
| Xion Water Technologies Ltd | Water & waste | 2019 |
| XJ Media Limited | Professional & scientific | 2025 |
| XJC Enterprises Limited | Professional & scientific | 2023 |
| XKR Ltd | Other services | 2025 |
| XL Displays Limited | Wholesale & retail | 2010 |
| XL Factory Access Ltd | Construction | 2023 |
| XL Holdings (Peterborough) Ltd | Financial services | 2023 |
| XL Projects (Peterborough) Ltd | Construction | 2024 |
| Xldecorations Ltd | Manufacturing | 2023 |
| Xlii Consultancy Services Limited | Information & communication | 2017 |
| Xlnc Estate Agents Ltd | Real estate | 2024 |
| Xoom Cars Ltd | Transport & logistics | 2024 |
| Xoxo Grill House 1 Ltd | Hospitality | 2018 |
| Xpectrum Limited | Information & communication | 2012 |
| Xpert Build Ltd | Construction | 2025 |
| Xpotion Ltd | Wholesale & retail | 2024 |
| Xpress Grill Ltd | Hospitality | 2025 |
| XR Motors Ltd | Wholesale & retail | 2024 |
| XSK Ltd | Administrative & support | 2026 |
| Xtravalue Ltd | Wholesale & retail | 2026 |
| Xtreme Brewery Limited | Manufacturing | 2020 |
| XYZ Pizza Ltd | Hospitality | 2024 |
| Y & B Property Management Ltd | Real estate | 2020 |
| Y&J PROPERTY4U Ltd | Real estate | 2024 |
| Y&T Global Wellness Limited | Wholesale & retail | 2022 |
| Yabazu Ltd | Wholesale & retail | 2024 |
| YAD Cardea Ltd | Hospitality | 2024 |
| YAD Logistics Ltd | Transport & logistics | 2023 |
| Yadah Resources Limited | Health & social care | 2021 |
| YAF Properties Ltd | Real estate | 2019 |
| Yagoda Composite Ltd | Manufacturing | 2026 |
| Yako Casino Ltd | Information & communication | 2025 |
| Yakoob Ltd | Health & social care | 2021 |
| Yakub and Co Perfumes Ltd | Manufacturing | 2025 |
| Yama & Yuki Ltd | Hospitality | 2026 |
| Yamako Accountancy Ltd | Professional & scientific | 2012 |
| Yane Limited | Information & communication | 2009 |
| Yanhuo Limited | Hospitality | 2023 |
| Yani LUK Ltd | Transport & logistics | 2025 |
| Yankees Takeaway Ltd | Hospitality | 2019 |
| Yankel Intermodal Logistics Ltd | Transport & logistics | 2024 |
| Yanni Financial Investment Ltd | Financial services | 2020 |
| YAP Ltd | Administrative & support | 2017 |
| YAQ Consulting Ltd | Professional & scientific | 2021 |
| Yarcar Ltd | Wholesale & retail | 2024 |
| Yard of ALE PUB Ltd | Administrative & support | 2017 |
| Yard Online Ltd | Information & communication | 2019 |
| Yards 235 Ltd | Wholesale & retail | 2024 |
| Yaris Constractor Ltd | Construction | 2025 |
| Yarwell Mill Country Park Limited | Administrative & support | 2019 |
| Yasar Cafe Ltd | Hospitality | 2018 |
| Yaseen Trans Ltd | Transport & logistics | 2016 |
| Yash Cafe Ltd | Hospitality | 2026 |
| Yates Development Group Ltd | Financial services | 2026 |
| Yaxley Car Centre Limited | Extraterritorial | 2004 |
| Yaxley Carpets Ltd | Wholesale & retail | 2006 |
| Yaxley CIC | Arts & recreation | 2025 |
| Yaxley Coachworks Limited | Wholesale & retail | 1989 |
| Yaxley FC (Facilities) Limited | Arts & recreation | 2015 |