| Alias Digital Ltd | Information & communication | 2025 |
| Alibaba Bullion Ltd | Wholesale & retail | 2025 |
| Alibon Limited | Health & social care | 2014 |
| Alice Froggett Coaching Ltd | Administrative & support | 2021 |
| Alice Rose Entertainment Ltd | Arts & recreation | 2026 |
| Alicia Consulting Ltd | Information & communication | 2023 |
| Alieu Sarr Delivery Ltd | Transport & logistics | 2026 |
| Align Healthcare Ltd | Health & social care | 2019 |
| Align One Hundred Ltd | Information & communication | 2024 |
| Aligned Finance Limited | Financial services | 2025 |
| Aliia AL - Dhahab Ltd | Wholesale & retail | 2025 |
| Alikhels Ltd | Health & social care | 2022 |
| Alim Limited | Information & communication | 2022 |
| Alin Patoi Limited | Transport & logistics | 2025 |
| Alincampean Ltd | Transport & logistics | 2025 |
| Alinea Consulting LLP | | 2012 |
| Alinejad Group Ltd | Hospitality | 2025 |
| Alinlogistics Limited | Transport & logistics | 2025 |
| Alinskip Ltd | Manufacturing | 2025 |
| Alioglu Ltd | Hospitality | 2022 |
| Alis Takeaway Leeds Limited | Hospitality | 2017 |
| Alisanco Limited | Health & social care | 2017 |
| Alishah Ltd | Wholesale & retail | 2020 |
| Alison Barnes Ltd | Professional & scientific | 2025 |
| Alison Taylor Limited | Information & communication | 2021 |
| Alisons Group Limited | Wholesale & retail | 2025 |
| Alistair Fale Anaesthesia Limited | Health & social care | 2012 |
| Alistair Flatman Planning Limited | Professional & scientific | 2017 |
| Alistair Stewart Urology Limited | Health & social care | 2026 |
| Aliter Consulting Limited | Information & communication | 2014 |
| Alium CSI Limited | Professional & scientific | 2021 |
| Alium Media Limited | Professional & scientific | 2019 |
| Alive Design Ltd | Construction | 2014 |
| Alixter Ltd | Wholesale & retail | 2023 |
| Aliz Ltd | Hospitality | 2019 |
| ALJ Electrical Ltd | Construction | 2025 |
| ALJ Entertainment Ltd | Arts & recreation | 2023 |
| ALJ Locum Services Ltd | Professional & scientific | 2024 |
| Aljon Limited | Administrative & support | 2023 |
| ALK Capital Limited | Financial services | 2020 |
| Alkali Environmental Limited | Professional & scientific | 2018 |
| Alke Technologies Ltd | Information & communication | 2024 |
| ALL 4'S Pet & Equestrian Supplies Ltd | Wholesale & retail | 2008 |
| ALL Aspect Trees Ltd | Wholesale & retail | 2017 |
| ALL Blues Showroom Ltd | Wholesale & retail | 2021 |
| ALL Brass & Woodwind Limited | Administrative & support | 2008 |
| ALL Clear (Leeds) Ltd | Water & waste | 2021 |
| ALL Community Connect CIC | Health & social care | 2022 |
| ALL Construction U.K Ltd | Other services | 2017 |
| ALL Day Accountants Ltd | Professional & scientific | 2015 |
| ALL Day Value Ltd | Wholesale & retail | 2017 |
| ALL Developments Leeds Ltd | Real estate | 2026 |
| ALL Express International Ltd | Transport & logistics | 2020 |
| ALL Foods Leeds Ltd | Wholesale & retail | 2025 |
| ALL Harry's Pals Ltd | Other services | 2025 |
| ALL in One Commercial Cleaning Ltd | Administrative & support | 2019 |
| ALL Make BUS and Coach Parts Ltd | Wholesale & retail | 2024 |
| ALL Mapped OUT Limited | Manufacturing | 2016 |
| ALL Mixed UP Ltd | Manufacturing | 2019 |
| ALL Nations Grocery Limited | Wholesale & retail | 2018 |
| ALL Nations Mini Me’S Childcare Ltd | Health & social care | 2026 |
| ALL Occasion Chauffeurs Ltd | Transport & logistics | 2026 |
| ALL Padel Limited | Arts & recreation | 2025 |
| ALL Parts (North) Ltd | Wholesale & retail | 2020 |
| ALL Paul Limited | Professional & scientific | 2013 |
| ALL Points North Productions Ltd | Arts & recreation | 2026 |
| ALL Points North PUB Company Ltd | Hospitality | 2023 |
| ALL Points North Publications Limited | Information & communication | 1990 |
| ALL Property Management Ltd | Real estate | 2016 |
| ALL Property Management Services Ltd | Construction | 2021 |
| ALL Property Services Leeds Ltd | Construction | 2025 |
| ALL Saints Court Ilkley (14-37) Management Co Ltd | Households | 2012 |
| ALL Seasons Energy Ltd | Administrative & support | 2017 |
| ALL Sports Events Ltd | Arts & recreation | 2019 |
| ALL Star Prizes Limited | Other services | 2021 |
| ALL Stars Hair & Beauty Ltd | Other services | 2024 |
| ALL System Go Ltd | Construction | 2025 |
| ALL That and More Limited | Wholesale & retail | 2014 |
| ALL the Scents UK Ltd | Wholesale & retail | 2019 |
| ALL the Way Limited | Wholesale & retail | 2022 |
| ALL Things Early Years Limited | Education | 2014 |
| ALL Things Portuguese Limited | Information & communication | 2011 |
| ALL to One Bill Ltd | Energy | 2021 |
| ALL Type Roofing & Building Group Ltd | Construction | 2026 |
| ALL U.K Goods Company Limited | Wholesale & retail | 2024 |
| ALL Works Yorkshire Ltd | Construction | 2020 |
| ALL YOU Need IS Drums Ltd | Information & communication | 2021 |
| All-In-One Multicare Service Ltd | Administrative & support | 2022 |
| All-Pak Engineering Ltd. | Manufacturing | 2014 |
| ALL4LABELS UK Ltd | Manufacturing | 1993 |
| Allan Security Ltd | Administrative & support | 2012 |
| Alldubee Ltd | Financial services | 2019 |
| Allema Properties Ltd | Real estate | 2024 |
| Allen Bates Limited | Professional & scientific | 1982 |
| Allen Design Team Ltd | Administrative & support | 2013 |
| Allen Healthcare Services Ltd | Health & social care | 2018 |
| Allen Keys Ltd | Real estate | 2017 |
| Allenda Ltd | Real estate | 2013 |
| Alleon Court Management Limited | Real estate | 2007 |
| Allerton Asia Ltd | Hospitality | 2020 |