| Amrnoonnoor Ltd | Health & social care | 2025 |
| Amron Security Systems Limited | Administrative & support | 2010 |
| AMS GAS and Heat Ltd | Construction | 2025 |
| Amsb Property Holdings Ltd | Real estate | 2025 |
| Amsm Solutions Ltd | Financial services | 2022 |
| Amsterdamned Limited | Wholesale & retail | 2002 |
| Amtrex Limited | Real estate | 2024 |
| AMV Couriers Limited | Transport & logistics | 2015 |
| AMY Tasty Kitchen Limited | Wholesale & retail | 2021 |
| Amyscleaning Limited | Other services | 2025 |
| AN Keystone Property Ltd | Real estate | 2026 |
| AN Premium Transport Ltd | Transport & logistics | 2018 |
| AN Transport Ltd | Transport & logistics | 2025 |
| ANA Freight Limited | Transport & logistics | 2023 |
| Anabolic Kitchen Ltd | Hospitality | 2025 |
| Anadu Art Gallery Ltd | Wholesale & retail | 2025 |
| Analbout Service Ltd | Professional & scientific | 2026 |
| Anantah Enterprises UK Limited | Wholesale & retail | 2017 |
| Anas Food Ltd | Hospitality | 2022 |
| Anas Idrees Limited | Transport & logistics | 2026 |
| Anas Mini Market Ltd | Wholesale & retail | 2025 |
| Anas the Barber Ltd | Other services | 2025 |
| Anavah Events CIC | Hospitality | 2025 |
| Anca RM Properties Ltd | Real estate | 2025 |
| Anchor Chippy Limited | Hospitality | 2026 |
| Anchor Distribution Ltd | Wholesale & retail | 2019 |
| Anchor Property Management Limited | Construction | 1996 |
| Anchor Trades & Input Limited | Health & social care | 2021 |
| Anchorage Global Limited | Financial services | 2023 |
| Anchorbrick Investments Ltd | Real estate | 2018 |
| Anchorbridge Care Services Ltd | Health & social care | 2026 |
| Andaine Limited | Construction | 2004 |
| Andaine Venture Capital 1 Limited | Construction | 2010 |
| Andany Ltd | Administrative & support | 2025 |
| Anderson Scott Solutions Limited | Administrative & support | 2010 |
| Andersons Residential Limited | Real estate | 2019 |
| Anderton Park Road Ltd | Professional & scientific | 2006 |
| Anderton Press Limited | Information & communication | 2014 |
| Andi Way Garden Design Ltd | Professional & scientific | 2021 |
| Andile. Ltd | Real estate | 2024 |
| Andmb Ltd | Administrative & support | 2025 |
| Andong Cleaning Solution Ltd | Administrative & support | 2025 |
| Andra Munro Design Ltd | Manufacturing | 2018 |
| Andras Dancs Limited | Construction | 2024 |
| Andreea Shop Ltd | Hospitality | 2026 |
| Andrew Harvey Optical Services Ltd | Wholesale & retail | 2017 |
| Andrew J Bishop Consulting Limited | Professional & scientific | 2015 |
| Andrew Silverwood Ltd | Other services | 2017 |
| Andrew Strevens Ltd | Real estate | 2013 |
| ANDREW68 Thermal Paints Ltd | Construction | 2024 |
| Andrews Autos Limited | Wholesale & retail | 2007 |
| Andrews Coatings Holdings Ltd | Financial services | 2024 |
| Andrews Creative Ltd | Transport & logistics | 2020 |
| Andrey Property Solutions Ltd | Construction | 2020 |
| Andu Legal Services Ltd | Other services | 2018 |
| Anduks Ltd | Public administration | 2023 |
| Andy Connolly Limited | Health & social care | 2024 |
| Andy Fittes Services Limited | Professional & scientific | 2018 |
| Andy Leek Limited | Arts & recreation | 2017 |
| Andy Mack Ltd | Transport & logistics | 2014 |
| Andy Solutions Limited | Administrative & support | 2010 |
| Andy the GAS (Codsall) Ltd | Construction | 2019 |
| Andy's Oven Cleaning Ltd | Other services | 2022 |
| Anes Industrial Ltd | Manufacturing | 2025 |
| Anetec Limited | Manufacturing | 2001 |
| Anfieldindex Pro Limited | Wholesale & retail | 2018 |
| Angel Care Homes Limited | Health & social care | 2005 |
| Angel's & Saint's Homecare Services Ltd | Health & social care | 2017 |
| Angel's & Saint's Transport Services Limited | Transport & logistics | 2025 |
| Angel's Food Store Limited | Wholesale & retail | 2024 |
| Angelcosmetics.Us Ltd | Wholesale & retail | 2024 |
| Angels Compound Ltd | Real estate | 2026 |
| Angiemcquillin Ltd | Professional & scientific | 2018 |
| Anglesey Sidings Limited | Real estate | 2001 |
| Anglian Drainage+ Ltd | Construction | 2026 |
| Anglican Network for Intercultural Churches Ltd | Information & communication | 2026 |
| Anglo African Renewables Ltd | Agriculture & fishing | 2024 |
| Anglo-African Carbon Sequestration Ltd | Agriculture & fishing | 2024 |
| Anglo-Chinese Exchange Ltd | Extraterritorial | 2007 |
| Angrej Property Ltd | Real estate | 2025 |
| ANI Transport B'Ham Ltd | Transport & logistics | 2023 |
| ANI UR Ruba Ltd | Wholesale & retail | 2026 |
| Anif Homes Ltd | Real estate | 2019 |
| Animals Cottage Rescue Center Ltd | Wholesale & retail | 2023 |
| Anita 1CLEANING Limited | Administrative & support | 2019 |
| Anju Sweets Limited | Manufacturing | 2025 |
| Anli Online Shopping Ltd | Wholesale & retail | 2021 |
| Anmol Dream House Limited | Real estate | 2025 |
| ANN Sheldon HR Limited | Administrative & support | 2018 |
| Anna Mini Market Ltd | Wholesale & retail | 2016 |
| Anna Recruitment Group Limited | Professional & scientific | 2024 |
| Annable Ltd | Real estate | 2018 |
| Annassa Ltd | Construction | 2015 |
| Annyeong Limited | Wholesale & retail | 2025 |
| Anochrome Technologies Limited | Manufacturing | 1998 |
| Anocote Polska Limited | Professional & scientific | 2014 |
| Anoint Apothecary Ltd | Other services | 2021 |
| Anointed by Asherah Ltd | Wholesale & retail | 2024 |
| Another Fine Mess Ltd | Real estate | 2023 |
| Ansa Recruitment Projects Limited | Administrative & support | 2024 |