| Yaseen Builders Ltd | Construction | 2018 |
| Yashi Construction and Design Limited | Construction | 2019 |
| Yasin a Solutions Ltd | Transport & logistics | 2026 |
| Yasin Global Consultancy Ltd | Education | 2025 |
| Yasmar Productions Ltd | Information & communication | 2023 |
| Yatihariprop Limited | Real estate | 2024 |
| Yawn Life CIC | Health & social care | 2013 |
| YAZ Services Ltd | Wholesale & retail | 2024 |
| Ybclogistics Limited | Transport & logistics | 2026 |
| YBS Accountant Ltd | Professional & scientific | 2015 |
| Yeaki Limited | Real estate | 2025 |
| Yeef Limited | Construction | 2025 |
| Yehgs Co Ltd | Wholesale & retail | 2020 |
| Yelix Limited | Wholesale & retail | 2025 |
| Yello Haus Ltd | Professional & scientific | 2026 |
| Yellowstone Computers Ltd | Information & communication | 2015 |
| Yellowstone Electronic Solutions Limited | Information & communication | 1996 |
| YEM Services Ltd | Other services | 2016 |
| Yenkofa Afrique Limited | Wholesale & retail | 2022 |
| Yetlac Limited | Health & social care | 2022 |
| Yettec Limited | Manufacturing | 2021 |
| Yiqbal Ltd | Wholesale & retail | 2021 |
| YIY Building Services Ltd | Construction | 2015 |
| Yiyyma Ltd | Administrative & support | 2025 |
| YJ Transport Ltd | Transport & logistics | 2025 |
| YK Investments Ltd | Other services | 2015 |
| YK Properties LTN Ltd | Real estate | 2024 |
| Ykss Ltd | Transport & logistics | 2023 |
| YL Ahmed Holding Ltd | Real estate | 2025 |
| YL Carpet Ltd | Construction | 2026 |
| YMB Hair & Beauty Salon Ltd | Other services | 2025 |
| YMO Trust Ltd | Other services | 2013 |
| YMZ Car Hire Ltd | Administrative & support | 2020 |
| Yobel Properties Ltd | Hospitality | 2019 |
| Yogsan Ltd | Wholesale & retail | 2017 |
| Yohan Security Ltd | Administrative & support | 2016 |
| YOO Seby Ltd | Construction | 2022 |
| York Engineering Specialities Limited | Professional & scientific | 2025 |
| Yosuru London Limited | Wholesale & retail | 2021 |
| Yotta Info Limited | Information & communication | 2014 |
| YOU ARE Able CIC | Other services | 2019 |
| Youfirstaid Ltd | Education | 2023 |
| Young Explorers Kids Camp Limited | Education | 2019 |
| Young Growers Club Ltd | Education | 2023 |
| Young Inspire Consultancy Limited | Administrative & support | 2025 |
| Young MED Ltd | Health & social care | 2022 |
| Younifi Limited | Health & social care | 2015 |
| Younique Football Development Ltd | Education | 2022 |
| Your Car Luton Ltd | Wholesale & retail | 2022 |
| Your Choice Foods Limited | Wholesale & retail | 2010 |
| Your Construction Services Limited | Construction | 2023 |
| Your Cuppa TEE Ltd | Manufacturing | 2025 |
| Your Family PA Ltd | Health & social care | 2025 |
| Your Home Your Garden Limited | Other services | 2022 |
| Your Life Your Choice Ltd | Other services | 2014 |
| Your Line Ltd | Information & communication | 2026 |
| Your Local Spark Ltd | Professional & scientific | 2022 |
| Your Mechanic Ltd | Wholesale & retail | 2024 |
| Your R Property Ltd | Real estate | 2023 |
| Your Timeline Limited | Information & communication | 2018 |
| Yourstoreltd Ltd | Wholesale & retail | 2025 |
| Yousef Ltd | Other services | 2015 |
| Yousha Laundry Ltd | Wholesale & retail | 2019 |
| Youth Network CIC | Other services | 2019 |
| Youthscape Events | Other services | 2021 |
| Youthscape Ltd | Education | 2000 |
| Youthscape Trading | Wholesale & retail | 2024 |
| Youthscape Youth Events Ltd | Education | 2025 |
| Yoyo Traders Ltd | Wholesale & retail | 2025 |
| Yoyo Travel Group . Ltd | Information & communication | 2025 |
| Yoyo.Email Limited | Information & communication | 2014 |
| YS Distributors Ltd | Wholesale & retail | 2026 |
| YS Solutions Ltd | Professional & scientific | 2022 |
| YS Tech Ltd | Information & communication | 2024 |
| YSA Holdings Ltd | Financial services | 2025 |
| YU55MAR Services Limited | Professional & scientific | 2025 |
| Yuco Properties Ltd | Real estate | 2022 |
| Yuhui Limited | Wholesale & retail | 2021 |
| Yuma Technology Limited | Information & communication | 2022 |
| Yummy Bites Luton Ltd | Hospitality | 2024 |
| Yummy Catering Ltd | Hospitality | 2023 |
| Yuzu International Trading Group Limited | Information & communication | 2025 |
| Yvonne J Photography Ltd | Professional & scientific | 2011 |
| YWB Holding Limited | Hospitality | 2024 |
| YWC Construction Ltd | Construction | 2023 |
| YWC Labour Supply Limited | Construction | 2025 |
| Z & a Solutions Limited | Information & communication | 2022 |
| Z & Co Logistics Limited | Transport & logistics | 2018 |
| Z & H Ltd | Hospitality | 2018 |
| Z & J Trading Ltd | Wholesale & retail | 2018 |
| Z & K Fleets Ltd | Administrative & support | 2019 |
| Z & L Logistics Ltd | Wholesale & retail | 2022 |
| Z & R Holdings Ltd | Financial services | 2021 |
| Z a ENG and Consulti NG Limited | Construction | 2025 |
| Z a Optics Limited | Health & social care | 2019 |
| Z T Healthcare Limited | Health & social care | 2022 |
| Z&A Care Limited | Health & social care | 2016 |
| Z&A Finance Limited | Professional & scientific | 2010 |
| Z&K Franchise Group Ltd | Hospitality | 2023 |
| Z&K Investments Ltd | Administrative & support | 2021 |