| ALL Cars Trade Center Ltd | Wholesale & retail | 2022 |
| ALL Construction Limited | Construction | 2009 |
| ALL Digits Ltd | Information & communication | 2025 |
| ALL for Little Ones Ltd | Wholesale & retail | 2025 |
| ALL Home Improvements Limited | Construction | 2025 |
| ALL in Rentals Ltd | Hospitality | 2026 |
| ALL Kids Active Childcare Ltd | Financial services | 2025 |
| ALL Kids Active Ltd | Arts & recreation | 2013 |
| ALL Kinds of Clever Ltd | Education | 2025 |
| ALL Roofing & Building Limited | Construction | 1999 |
| ALL Round Music Limited | Wholesale & retail | 2019 |
| ALL Secure Shutters and Grilles Limited | Administrative & support | 1995 |
| ALL Styles Home Improvements Limited | Construction | 2026 |
| ALL Technical Support Limited | Manufacturing | 2024 |
| ALL Things Gone Removals Limited | Water & waste | 2025 |
| ALL Time Commercial Ltd | Real estate | 2025 |
| ALL Time Leisure Ltd | Arts & recreation | 2026 |
| ALL Time Secure Investment Ltd | Real estate | 2022 |
| ALL Time Secure Ltd | Other services | 2020 |
| ALL Time Security Limited | Administrative & support | 2012 |
| ALL Weather Roofing Company Bucks Ltd | Construction | 2021 |
| ALL Weather Tracks Association | Professional & scientific | 2012 |
| All-Igadgets Ltd | Wholesale & retail | 2015 |
| All-Ways Travel Ltd | Transport & logistics | 2022 |
| Allan Janes LLP | | 2004 |
| Allardtech Security Ltd | Information & communication | 2025 |
| Alldrew Limited | Wholesale & retail | 2018 |
| Allen Building Services Ltd | Construction | 2019 |
| Alliance Golf Limited | Wholesale & retail | 2002 |
| Allied International Risk Limited | Administrative & support | 2015 |
| Allign Limited | Information & communication | 2024 |
| Allisdot Ltd | Information & communication | 2026 |
| Allparts UK Ltd | Wholesale & retail | 2003 |
| Alltradespeople Management Ltd | Construction | 2021 |
| Allure Boutique Ltd | Other services | 2025 |
| Allure HW Ltd | Other services | 2025 |
| Allways Tailormade Travel Ltd | Administrative & support | 2011 |
| Allyouwant.Pk Ltd | Wholesale & retail | 2022 |
| Almalaki Foods Ltd | Wholesale & retail | 2024 |
| Almalaki Limited | Administrative & support | 2022 |
| Almas Traders Limited | Wholesale & retail | 2025 |
| Almeida Flooring Ltd | Construction | 2025 |
| Almesa Ltd | Real estate | 2020 |
| Almost Impossible Ltd | Arts & recreation | 2011 |
| Aloc Holdings Ltd | Real estate | 2026 |
| Aloka Enterprises Ltd | Transport & logistics | 2025 |
| Alondra Ltd | Construction | 2019 |
| Alot Consulting Limited | Information & communication | 2014 |
| Alpha Automotive Group Ltd | Wholesale & retail | 2026 |
| Alpha Commercial Enterprises Ltd | Professional & scientific | 2022 |
| Alpha Duplication Limited | Information & communication | 2001 |
| Alpha Immersive Limited | Education | 2024 |
| Alpha Pulse Research Ltd | Information & communication | 2025 |
| Alpha Retail Ltd | Wholesale & retail | 2022 |
| Alpha Schools (Holdings) Limited | Education | 2010 |
| Alpine Stores Ltd | Wholesale & retail | 2022 |
| Alpine UK Construction Ltd | Extraterritorial | 2024 |
| ALR Accountancy Ltd | Professional & scientific | 2010 |
| Altaxa Accountants Limited | Professional & scientific | 2020 |
| Alteo Capitals Ltd | Real estate | 2026 |
| Altiplas Limited | Manufacturing | 2016 |
| Altogether Holidays Limited | Administrative & support | 2023 |
| Altplan Consulting Limited | Information & communication | 2024 |
| Altros Engineering Limited | Manufacturing | 1992 |
| Alumi-Lite Ltd | Construction | 2009 |
| Alvins Tails Limited | Other services | 2010 |
| Alyun Management Ltd | Transport & logistics | 2025 |
| Alzo Properties Ltd | Households | 2025 |
| AM Basra Ltd | Information & communication | 2024 |
| AM Kang Consultancy Ltd | Administrative & support | 2018 |
| AM Prop Traders Ltd | Real estate | 2025 |
| AMA Labels Limited | Manufacturing | 2001 |
| Ama-I Ltd | Water & waste | 2023 |
| Amaazo Catering Ltd | Hospitality | 2024 |
| Amah Consultancy Limited | Information & communication | 2022 |
| Amah Developments Limited | Real estate | 2021 |
| Amahw Ltd | Transport & logistics | 2020 |
| Amairah Ltd | Wholesale & retail | 2024 |
| Amal K Limited | Health & social care | 2021 |
| Aman Randhawa Construction Ltd | Construction | 2020 |
| Amanah Property Group Limited | Real estate | 2024 |
| Amanda Johnston Meetings and Events Limited | Administrative & support | 2016 |
| Amanda Waterstone Ltd | Professional & scientific | 2026 |
| Amandid Limited | Wholesale & retail | 2021 |
| Amandla Consulting Group Ltd | Professional & scientific | 2025 |
| Amansan Creatives Limited | Professional & scientific | 2011 |
| Amar Halal Meat & BRO Limited | Wholesale & retail | 2012 |
| Amas BI Solutions Ltd | Information & communication | 2014 |
| Amasophi Limited | Professional & scientific | 2018 |
| Amazoom Solutions Limited | Administrative & support | 2023 |
| AMB Associates Limited | Professional & scientific | 2003 |
| AMB Glass Limited | Construction | 2025 |
| Amba Does Numbers Limited | Professional & scientific | 2015 |
| Amber 04 Events Ltd | Wholesale & retail | 2023 |
| Ambi Property Ltd | Real estate | 2022 |
| Ambi Stays Ltd | Hospitality | 2023 |
| Ambition Fitness Limited | Arts & recreation | 2021 |
| Ambra Holdings PTE Ltd | Financial services | 2024 |
| Amee Georgina Ltd | Health & social care | 2025 |
| Ameg TM Ltd | Construction | 2018 |