| AJS Freight Limited | Transport & logistics | 2016 |
| AJS Passenger Travel Limited | Transport & logistics | 2025 |
| AJS Rentals Limited | Real estate | 2023 |
| Ajsdent Ltd | Health & social care | 2022 |
| AK Construction Services Ltd | Construction | 2017 |
| AK Euroasia Limited | Wholesale & retail | 2025 |
| AK Executive Travel Limited | Transport & logistics | 2026 |
| AK Primecart Ltd | Wholesale & retail | 2026 |
| AK Spinal Surgery Services Ltd | Health & social care | 2019 |
| Aka-Pharma Ltd | Wholesale & retail | 2018 |
| Akes 1 Ltd | Hospitality | 2024 |
| Akfi Limited | Real estate | 2025 |
| Akhan (Stoke) Limited | Construction | 2019 |
| Akodigbo Ltd | Health & social care | 2021 |
| Akounting Solutions Limited | Professional & scientific | 2022 |
| Akristos Limited | Administrative & support | 2001 |
| AKS Real Estate Limited | Real estate | 2025 |
| Aksa SU Limited | Extraterritorial | 2018 |
| Akshat Business Solutions Ltd | Hospitality | 2026 |
| AKT Cheshire Limited | Construction | 2021 |
| Aktumel Ltd | Wholesale & retail | 2025 |
| Akumen Consulting Ltd | Professional & scientific | 2024 |
| AL & I Johnston Limited | Professional & scientific | 2024 |
| AL Aziz Travels Ltd | Transport & logistics | 2024 |
| AL Azzaro Limited | Wholesale & retail | 2025 |
| AL Boulton & SON Ltd | Manufacturing | 2002 |
| AL Fast Food Ltd | Hospitality | 2025 |
| AL Hafiz Acadmey UK Limited | Education | 2016 |
| AL Hamza Fast Food Limited | Hospitality | 2020 |
| AL Helal Kitchen Ltd | Hospitality | 2024 |
| AL LL Properties Ltd | Real estate | 2026 |
| AL Muqaddim Ltd | Wholesale & retail | 2025 |
| AL Noor Properties Ltd | Real estate | 2020 |
| AL Rosseress Ltd | Administrative & support | 2026 |
| AL Syed Builders Limited | Construction | 2024 |
| Al-Haseeb Travels Andal-Haseeb Eseller Ltd | Wholesale & retail | 2017 |
| Al-Madina Holdings Ltd | Financial services | 2024 |
| Al-Mumin Executive Vehicles Ltd | Wholesale & retail | 2022 |
| Al-Rihew Limited | Health & social care | 2025 |
| Al-Thawakul Travels Hajj & Umrah Services Ltd Ltd | Administrative & support | 2025 |
| Alahbab Centre Limited | Education | 2025 |
| Alahbab UK Limited | Education | 2026 |
| Alaj Transport Limited | Transport & logistics | 2018 |
| Aland Rafati Ltd | Other services | 2025 |
| Alanic Ltd | Hospitality | 2016 |
| Alanite Software Ltd | Information & communication | 2026 |
| Alantech Ltd | Extraterritorial | 2020 |
| Alaserfahion Limited | Wholesale & retail | 2026 |
| Albah Consulting Limited | Professional & scientific | 2012 |
| Albenook Limited | Professional & scientific | 1982 |
| Albion Stays Ltd | Construction | 2026 |
| Albionsec Limited | Information & communication | 2024 |
| Albr Holdings Ltd | Financial services | 2017 |
| Albrighton & Woodland Hunt Limited | Arts & recreation | 2007 |
| Albrogen Fulfilment Ltd | Transport & logistics | 2022 |
| Alchemy Consultants & Engineers Limited | Professional & scientific | 2011 |
| Alchemy Healing Circles Ltd | Health & social care | 2026 |
| Alchemy Transformation Limited | Other services | 2018 |
| Alcock Construction Ltd | Construction | 2025 |
| Alden Engineering Ltd | Professional & scientific | 2025 |
| Alden Machines Ltd | Professional & scientific | 2025 |
| Alder Grange Limited | Health & social care | 2006 |
| Alder HEY Esco Ltd | Professional & scientific | 2020 |
| Alderley Property Limited | Real estate | 1986 |
| ALE Craft Pubs Limited | Hospitality | 2023 |
| Ale&Bogdan Transport Ltd | Transport & logistics | 2025 |
| Aledex Limited | Other services | 2003 |
| Aleeza Traders Ltd | Wholesale & retail | 2024 |
| Alessi Restaurant Limited | Hospitality | 2022 |
| Alex Banica Ltd | Water & waste | 2023 |
| Alex Logistics Ltd | Transport & logistics | 2016 |
| Alex Morrison Marketing Ltd | Information & communication | 2024 |
| Alex Specialties Limited | Wholesale & retail | 2026 |
| Alexa Rose Ltd | Wholesale & retail | 2021 |
| Alexander Mann Coin Specialists Ltd | Wholesale & retail | 2018 |
| Alexander Marketing Ltd | Information & communication | 2024 |
| Alexander Rail Advisory Ltd | Professional & scientific | 2026 |
| Alexander Rose Competitions Ltd | Wholesale & retail | 2026 |
| Alexander Stays Ltd | Hospitality | 2025 |
| Alexander Trading Estate Ltd | Real estate | 2025 |
| Alexandra Duncan Limited | Real estate | 2018 |
| Alexio 2020 Ltd | Transport & logistics | 2020 |
| Alexis Logistics Services Ltd | Transport & logistics | 2019 |
| Alfa Mohuha Limited | Real estate | 2021 |
| Alfalah Business Solutions Ltd | Hospitality | 2014 |
| Alfano Consultancy Ltd | Arts & recreation | 2024 |
| Algo IT Solutions Limited | Information & communication | 2021 |
| ALH Care Ltd | Health & social care | 2018 |
| Alhambra Garage Ltd | Wholesale & retail | 2002 |
| Alhelal Ltd | Hospitality | 2019 |
| ALI & Osama Ltd | Wholesale & retail | 2025 |
| ALI Baba Great Traders Ltd | Wholesale & retail | 2026 |
| ALI International Trading Group Limited | Wholesale & retail | 2026 |
| ALI Recovery Ltd | Wholesale & retail | 2025 |
| ALI Toumi Ltd | Wholesale & retail | 2025 |
| Ali&Azlan Ltd | Wholesale & retail | 2025 |
| Ali's Spice (Blythe) Limited | Hospitality | 2024 |
| Ali,S Housing Ltd | Real estate | 2026 |
| Alia Food&Co Ltd | Manufacturing | 2022 |
| Alias Services Limited | Administrative & support | 2025 |