| Adot LED UK Limited | Administrative & support | 2018 |
| ADS 5 Property Rental Ltd | Administrative & support | 2024 |
| ADT Cleaning Services Ltd | Administrative & support | 2026 |
| Adufram Foods Ltd | Manufacturing | 2026 |
| Advance Building Solutions Limited | Manufacturing | 2023 |
| Advanced Ecotech UK Limited | Wholesale & retail | 2017 |
| Advanced Medical Analytics Limited | Professional & scientific | 2019 |
| Advanced Medical Clinics Limited | Health & social care | 1995 |
| Aegis Securities (Bromley) Limited | Construction | 1972 |
| Aerial Scaffolding Limited | Construction | 1972 |
| Aero Drone Ltd | Administrative & support | 2022 |
| Aeseah Ltd | Real estate | 2025 |
| Afearn Accountancy Ltd | Professional & scientific | 2022 |
| Affinity Properties Ltd | Households | 2023 |
| Affirm Commercial Services Limited | Administrative & support | 2018 |
| Affix Windows and Doors Limited | Construction | 2013 |
| Affleck Accountancy Limited | Professional & scientific | 2019 |
| Afrikabal Limited | Wholesale & retail | 2025 |
| AG Top Property Ltd | Real estate | 2021 |
| AG. 1 Limited | Administrative & support | 2019 |
| Agapao Decor Limited | Other services | 2013 |
| Agency-Atlantis Ltd | Information & communication | 2025 |
| Agriloop Rentals Ltd | Administrative & support | 2026 |
| Aharad Ltd | Real estate | 2023 |
| Ahava Care Limited | Health & social care | 2024 |
| Ahluwalia Films Limited | Extraterritorial | 2023 |
| Ahluwalia Limited | Extraterritorial | 2021 |
| Ahluwalia Studio Limited | Wholesale & retail | 2018 |
| Ahluwalia World Limited | Extraterritorial | 2023 |
| AHT Aesthetics Ltd | Other services | 2024 |
| AI Commerce Ltd | Wholesale & retail | 2026 |
| AI Maison Limited | Real estate | 2025 |
| Ailes Lash Limited | Other services | 2019 |
| AIM House Investments Limited | Financial services | 2014 |
| Air Cooled Classic Motorcycles Limited | Wholesale & retail | 2016 |
| Air Strategy Ltd | Financial services | 2022 |
| Airport Transfers Network Ltd | Transport & logistics | 2026 |
| Aiter.Io Ltd | Information & communication | 2024 |
| AJ Davis Property Ltd | Real estate | 2025 |
| AJA Partnership Limited | Other services | 2013 |
| AJC QS Services Limited | Professional & scientific | 2017 |
| AJM Prop Services Limited | Real estate | 2020 |
| Ajrg Electrical Limited | Construction | 2023 |
| Ajrt Medical Ltd | Health & social care | 2025 |
| AJT Housing CIC | Real estate | 2024 |
| AJW Technical Services Limited | Professional & scientific | 2018 |
| AK Perog Global Konsult Ltd | Information & communication | 2018 |
| AK Surveys and Reports Services Ltd | Administrative & support | 2025 |
| AKC Inclusion Limited | Arts & recreation | 2021 |
| AKC Opportunities Foundation CIC | Public administration | 2025 |
| Akdag & Co. Limited | Professional & scientific | 2009 |
| AKK30 Holdings Limited | Financial services | 2020 |
| Akoom Technologies Limited | Information & communication | 2012 |
| AL Chickone UK Limited | Hospitality | 2025 |
| AL Sarmada Property Investments Limited | Real estate | 2018 |
| Al-Rathai Thai Cuisine Ltd | Hospitality | 2024 |
| Alan DRY Cleaning Limited | Other services | 2019 |
| Albany Services Ltd | Other services | 2017 |
| Albatross Apps Limited | Information & communication | 2019 |
| Albermore Properties Limited | Real estate | 2013 |
| Albion Events Limited | Administrative & support | 2020 |
| Albson Services Ltd | Administrative & support | 2011 |
| Alca Group T/A EMD Group Ltd | Construction | 2025 |
| Alegail Limited | Real estate | 2022 |
| Alex Brandon Management Ltd | Real estate | 2023 |
| Alex Ienci Limited | Administrative & support | 2019 |
| Alex Stead Art Ltd | Arts & recreation | 2016 |
| Alexander Alexander Ltd | Arts & recreation | 2018 |
| Alexander Bernhardt Publishing Company-Uk | Information & communication | 2015 |
| Alfa. Full Refurbishment Builder Ltd | Other services | 2017 |
| Alfie & Amanda Limited | Wholesale & retail | 2019 |
| Algorithmic Consultations Limited | Wholesale & retail | 2026 |
| Alitas Beauty Limited | Other services | 2022 |
| Alkatam Algorithms Limited | Information & communication | 2025 |
| Alkend Limited | Wholesale & retail | 1985 |
| ALL A-Board Day Nursery & Tiny Town Ltd | Education | 2023 |
| ALL Aspects Roofing and Property Maintenance Ltd | Construction | 2021 |
| ALL Basis Covered Limited | Construction | 2024 |
| ALL Door Services London Limited | Administrative & support | 2009 |
| ALL Electrical Contractors Ltd | Construction | 2015 |
| ALL Interiors Kent Ltd | Administrative & support | 2020 |
| ALL Kent Properties Limited | Real estate | 2024 |
| ALL Kent Shutters & Blinds Limited | Wholesale & retail | 2014 |
| ALL Kids CAN Limited | Arts & recreation | 2015 |
| ALL Reach Cleaning Ltd | Administrative & support | 2022 |
| ALL Round Building Limited | Construction | 2016 |
| ALL Season Trade Ltd | Wholesale & retail | 2022 |
| ALL Seasons Mechanical Services Limited | Construction | 2009 |
| ALL Seasons Plumbing and Heating Services Limited | Construction | 2024 |
| ALL Sports 4 Kids Ltd | Arts & recreation | 2023 |
| Allenswood Painting & Decorating Limited | Construction | 2013 |
| Alliance Elevator Services Limited | Administrative & support | 2017 |
| Allied Technical Services (UK) Limited | Information & communication | 2002 |
| Allister Communications Ltd | Professional & scientific | 2016 |
| Allshot Services Limited | Professional & scientific | 2017 |
| Allwork Solutions Limited | Construction | 2020 |
| Almiche Elms Ltd | Construction | 2025 |
| Aloha Capital Holdings Limited | Financial services | 2024 |
| ALP BR1 Limited | Hospitality | 2019 |
| ALP Coffee Limited | Hospitality | 2019 |