| Wormington Farming Limited | Agriculture & fishing | 2024 |
| Wrens Nest Holdings Limited | Professional & scientific | 2015 |
| Writeskills Ltd | Wholesale & retail | 2025 |
| WSB Coatings Limited | Manufacturing | 2013 |
| WSD Fire & Electrical Ltd | Construction | 2021 |
| WSD Group Ltd | Financial services | 2025 |
| WSD Thermal Services Limited | Construction | 2024 |
| WTF Properties Ltd | Real estate | 2021 |
| Wych Bearings Limited | Wholesale & retail | 2012 |
| Wychbold Service Station Ltd | Wholesale & retail | 2017 |
| Wychwood Media Limited | Information & communication | 2019 |
| Wychwood Moving Picture Company Limited | Information & communication | 2011 |
| Wyld Style Limited | Information & communication | 2021 |
| Wyld Talent Limited | Professional & scientific | 2024 |
| Wyneyard Developments Ltd | Construction | 2023 |
| Wyneyard Service Ltd | Real estate | 2026 |
| Wyre Ltd | Information & communication | 2020 |
| Wyvern Gate Trade Limited | Wholesale & retail | 2026 |
| X Media Group Ltd | Information & communication | 2025 |
| X-Pand (Ggcs) Ltd. | Wholesale & retail | 1994 |
| Xcite Projects Limited | Construction | 2002 |
| Xclusive Doors UK Ltd | Construction | 2011 |
| Xepho Ltd | Information & communication | 2024 |
| Xiwang Limited | Public administration | 2022 |
| Xpert Support Limited | Professional & scientific | 2015 |
| XPO9TIAL Ltd | Wholesale & retail | 2023 |
| Xpozero Limited | Administrative & support | 2024 |
| Y Rhath Ltd. | Education | 2025 |
| Yachtzoo Limited | Wholesale & retail | 2021 |
| Yahweh Care Limited | Health & social care | 2026 |
| YANTRA88 Ltd | Health & social care | 2017 |
| Yard Works Birmingham Ltd | Real estate | 2026 |
| Yardley Electrical Services Ltd | Administrative & support | 2018 |
| Yellow Belly Films Limited | Information & communication | 2017 |
| Yellow Financing Limited | Real estate | 2018 |
| Yellow Media Limited | Administrative & support | 2016 |
| YI PIN BAI WEI and HAO MEN Ltd | Hospitality | 2020 |
| Yitr Ltd | Education | 2026 |
| Ynwa Taverns Ltd | Hospitality | 2024 |
| Yock Yock Associates Limited | Real estate | 2017 |
| Yogurt Top Marketing Limited | Administrative & support | 2014 |
| YOU in Mind Limited | Real estate | 1999 |
| You'Re a Star Services Ltd | Other services | 2024 |
| Youngest in the Room Ltd | Education | 2026 |
| Your Healing Ltd | Extraterritorial | 2017 |
| Your Time Leisure Ltd | Hospitality | 2019 |
| YR Property Investments Limited | Real estate | 2023 |
| YUM YUM Sushi Bar Limited | Hospitality | 2023 |
| Yuncheng Limited | Real estate | 2021 |
| Zafosh UK Limited | Wholesale & retail | 2024 |
| ZAK Clinic Ltd | Health & social care | 2024 |
| ZAM ZAM Shop Ltd | Wholesale & retail | 2023 |
| Zamzam Mini Store Ltd | Wholesale & retail | 2026 |
| Zed-Parts Limited | Wholesale & retail | 2014 |
| Zenergy Wellness Bromsgrove Limited | Arts & recreation | 2024 |
| Zenergy Wellness Holdings Limited | Health & social care | 2024 |
| Zenergy Wellness Limited | Arts & recreation | 2023 |
| Zensory Blankets Ltd | Wholesale & retail | 2024 |
| Zentrix Pro Ltd | Wholesale & retail | 2025 |
| Zest Accountancy Limited | Professional & scientific | 2012 |
| Zest Accountants Ltd | Professional & scientific | 2014 |
| Zest Accounting Limited | Professional & scientific | 2013 |
| Zhim International Ltd | Wholesale & retail | 2023 |
| Zicam Defence Limited | Administrative & support | 2024 |
| Zicam Electrical Group Limited | Construction | 2023 |
| Zicam Facilities Management Limited | Extraterritorial | 2023 |
| Zicam Fire Limited | Public administration | 2021 |
| Zicam Group Limited | Financial services | 2023 |
| Zicam Holdings Limited | Financial services | 2026 |
| Zicam Integrated Security Systems Ltd | Administrative & support | 2021 |
| Zicam Medical Services Limited | Other services | 2022 |
| Zicam Systems Group Ltd | Administrative & support | 1996 |
| Zicam Training Academy Limited | Education | 2026 |
| ZIF Management Control LLP | | 2025 |
| ZIF Northfield Ltd | Wholesale & retail | 2018 |
| ZIG Zags Hair Technique Limited | Other services | 2011 |
| ZIG Zags Play & Party Ltd | Health & social care | 2026 |
| Zircom Data Communications Limited | Information & communication | 1994 |
| Zircom Trustee Limited | Professional & scientific | 2025 |
| Zivaana Fashion Limited | Wholesale & retail | 2025 |
| Zorro Films Limited | Information & communication | 2021 |
| ZSK Property Developers Ltd | Real estate | 2025 |
| Zurity Limited | Education | 2018 |