| Yorkshire Voice Therapy Ltd | Health & social care | 2021 |
| Yorkshire Warehouse Limited | Wholesale & retail | 2026 |
| Yorkshire Waste Management Ltd | Transport & logistics | 2023 |
| Yorkshire Waste Solutions Ltd | Water & waste | 2020 |
| Yorkshire Water Finance PLC | Administrative & support | 2018 |
| Yorkshire Water Limited | Professional & scientific | 1999 |
| Yorkshire Water Services Finance Limited | Professional & scientific | 2003 |
| Yorkshire Water Services Holdings Limited | Professional & scientific | 2009 |
| Yorkshire Water Services Limited | Water & waste | 1989 |
| Yorkshire Women's Forum CIC | Education | 2024 |
| Yorkshire Wool Company Limited | Manufacturing | 2023 |
| Yorkshiretime&Jewellery Ltd | Wholesale & retail | 2024 |
| Yorkshirevansales Limited | Wholesale & retail | 2025 |
| YOU and ME Media Limited | Manufacturing | 2015 |
| YOU and YOU Podcast Ltd | Information & communication | 2026 |
| YOU Building Ltd | Construction | 2016 |
| YOU Want Beef? Bradford Ltd | Hospitality | 2025 |
| Young Dreamss Investments CIC | Administrative & support | 2025 |
| Young Free Spirits Limited | Health & social care | 2026 |
| Young Hearts Homes Ltd | Health & social care | 2026 |
| Young MAG Holdings Ltd | Construction | 2021 |
| Young Ones (Hartlepool) Ltd | Wholesale & retail | 2012 |
| Young Street Paper Ltd | Wholesale & retail | 2020 |
| Young Trailblazers Limited | Health & social care | 2026 |
| Younis Properties Ltd | Real estate | 2022 |
| Younis Property Group Limited | Real estate | 2019 |
| Youqam Ventures Limited | Hospitality | 2014 |
| Your After School Academy Ltd | Health & social care | 2026 |
| Your After School Club Ltd | Public administration | 2024 |
| Your Care Resource Centre Ltd | Real estate | 2020 |
| Your Choice Estate Agents Ltd | Real estate | 2025 |
| Your Choice Properties Limited | Real estate | 2025 |
| Your Connect Hub CIC | Health & social care | 2025 |
| Your Family Doctor Ltd | Health & social care | 2022 |
| Your Favourite Builder Ltd | Construction | 2025 |
| Your Glaze UK Ltd | Construction | 2019 |
| Your Good Day Ltd | Wholesale & retail | 2023 |
| Your Green Deal Ltd | Other services | 2020 |
| Your Local (BFD) Ltd | Wholesale & retail | 2023 |
| Your Local (Bradford) Ltd | Wholesale & retail | 2025 |
| Your Local DIY Limited | Wholesale & retail | 2018 |
| Your Market Allerton Ltd | Wholesale & retail | 2026 |
| Your Perfect Smiles Ltd | Other services | 2020 |
| Your Plates Ltd | Wholesale & retail | 2019 |
| Your Renovation Group Ltd | Wholesale & retail | 2023 |
| Your Shop Market Ltd | Wholesale & retail | 2025 |
| Yourcare Maintennance Ltd | Health & social care | 2025 |
| Yourfooty Events Limited | Wholesale & retail | 2025 |
| Yourphone Limited | Wholesale & retail | 2026 |
| Yours DIY and Plumbing Supplies Ltd | Wholesale & retail | 2015 |
| Yourstones Limited | Real estate | 2017 |
| Yousaf Estates Ltd | Real estate | 2025 |
| Yousafzai Trades Limited | Wholesale & retail | 2023 |
| Youth Football Academy Ltd | Education | 2024 |
| Youth Sports Development Ltd | Arts & recreation | 2014 |
| Youth United CIC | Education | 2025 |
| Youthtrain Limited | Education | 2006 |
| Youtopia Educational System UK Ltd | Education | 2014 |
| Yoyochicken Ltd | Hospitality | 2025 |
| YPM Local Limited | Construction | 2010 |
| Ypmuk Limited | Real estate | 2022 |
| Yrkb Ltd | Wholesale & retail | 2023 |
| YRR Limited | Real estate | 2024 |
| YS Consultancy Ltd | Other services | 2025 |
| YS Savers Ltd | Wholesale & retail | 2023 |
| YSS Property Investments LLP | | 2024 |
| Yss-Suspension-Uk Ltd | Wholesale & retail | 2024 |
| Yssi Vallo Aesthetics Ltd | Other services | 2022 |
| YT Recovery's Ltd | Manufacturing | 2022 |
| YTO Express Huddersfield Limited | Transport & logistics | 2019 |
| YTS Bradford Ltd | Transport & logistics | 2023 |
| Yukhshee Locum Ltd | Health & social care | 2020 |
| Yumburg Limited | Hospitality | 2021 |
| Yumii Beauty Ltd | Wholesale & retail | 2025 |
| Yummy Bites Ltd | Hospitality | 2024 |
| Yusef Rebin Ltd | Wholesale & retail | 2024 |
| Yusha's Professional Services Ltd | Health & social care | 2023 |
| Yusuf Motors Limited | Wholesale & retail | 2025 |
| YW Valeting Ltd | Administrative & support | 2023 |
| Ywmc Ltd | Wholesale & retail | 2019 |
| YZ Taxis Limited | Transport & logistics | 2023 |
| Z & a Builders Ltd | Construction | 2025 |
| Z & a Investments Limited | Real estate | 2009 |
| Z & K Distributors Limited | Wholesale & retail | 2018 |
| Z a Construction Management Services Ltd | Construction | 2014 |
| Z a H C S Limited | Wholesale & retail | 2015 |
| Z a Khan Limited | Construction | 2019 |
| Z ALI Online Sales Ltd | Wholesale & retail | 2023 |
| Z Auto Care Ltd | Wholesale & retail | 2021 |
| Z Bridal Studio Limited | Other services | 2009 |
| Z Car Parts Limited | Wholesale & retail | 2025 |
| Z Catering Equipment Ltd | Manufacturing | 2018 |
| Z Contracts Ltd | Other services | 2018 |
| Z Khan Locums Ltd | Health & social care | 2022 |
| Z Khan Trading Ltd | Wholesale & retail | 2019 |
| Z M 247 Ltd | Hospitality | 2026 |
| Z M Management Services Ltd | Administrative & support | 2025 |
| Z Malik Locums Ltd | Health & social care | 2013 |
| Z N Healthcare Ltd | Health & social care | 2024 |
| Z Rehman Services Limited | Other services | 2019 |