| Angels Paradise Limited | Hospitality | 1997 |
| Angels VK Ltd | Hospitality | 2018 |
| Angelseraph&Co Limited | Administrative & support | 2025 |
| Anghelescu Ionut Limited | Transport & logistics | 2017 |
| Anglesey Radiation & Technical Services Ltd | Manufacturing | 2026 |
| Anglo China Allied Company Limited | Professional & scientific | 2006 |
| Anglo Chinese Property Corporation Ltd | Construction | 2013 |
| Angoor Ltd | Professional & scientific | 2025 |
| Angoor Technologies Ltd | Professional & scientific | 2025 |
| Angus Berwick Ltd | Administrative & support | 2023 |
| Angusrx Medical Limited | Health & social care | 2025 |
| Anhelina Ltd | Health & social care | 2025 |
| Aniekpeno Fashion Limited | Manufacturing | 2022 |
| Aniela Ltd | Hospitality | 2025 |
| Anil Israni Limited | Health & social care | 2023 |
| Animal AID 246 | Wholesale & retail | 2011 |
| Animal Disposal & Salvage Limited | Extraterritorial | 2011 |
| Animals at Home (Merseyside) Ltd | Professional & scientific | 2017 |
| Animated Technologies Ltd | Information & communication | 2017 |
| Aniq & Ruby Limited | Health & social care | 2009 |
| Anirockstudio Limited | Information & communication | 2025 |
| Anirtak Digital Ltd | Professional & scientific | 2023 |
| Anita Walton Ltd | Wholesale & retail | 2021 |
| ANJ Social Media Marketing Limited | Professional & scientific | 2019 |
| Anjon Freight Services Limited | Transport & logistics | 1976 |
| ANK MOR Ltd | Hospitality | 2024 |
| Ankara Fitness Ltd | Education | 2026 |
| Ankrah Limited | Professional & scientific | 2019 |
| Ankrah Properties Ltd | Real estate | 2017 |
| Ankrah Scaffolding Limited | Construction | 2025 |
| Anley Family Trading Limited | Professional & scientific | 2020 |
| Anlo Properties LLP | | 2017 |
| Anmol Curry's Ltd | Hospitality | 2024 |
| Anmol Enterprises Ltd | Transport & logistics | 2022 |
| Anmol Express Ltd | Hospitality | 2026 |
| ANN Sullivan Limited | Health & social care | 2017 |
| Anna Khanna Ltd | Professional & scientific | 2016 |
| Anna Leaker Ltd | Professional & scientific | 2019 |
| Anna Nail Salon Ltd | Other services | 2023 |
| Anna Nails Beauty Salon Ltd | Other services | 2024 |
| Anna Neapolitan Pizzeria Ltd | Hospitality | 2017 |
| Anna's Collections Limited | Wholesale & retail | 2023 |
| Annabella Lucy Limited | Other services | 2024 |
| Annamy Properties Limited | Real estate | 2026 |
| Annarella Limited | Hospitality | 2009 |
| Annc Consulting Ltd | Professional & scientific | 2017 |
| Annette Locums Limited | Education | 2004 |
| Annex 6 Limited | Professional & scientific | 2026 |
| Annexe Inc. Limited | Real estate | 1994 |
| Annexo Limited | Extraterritorial | 2018 |
| Annf Fashion Limited | Other services | 2021 |
| Annmary-Joseph Limited | Health & social care | 2012 |
| Anno Domini 57 CIC | Administrative & support | 2025 |
| Anonymous Ltd | Wholesale & retail | 2025 |
| Another Classroom Ltd | Administrative & support | 2025 |
| Another Coffee Place Ltd | Hospitality | 2025 |
| Another One Productions Ltd | Other services | 2022 |
| Another Space Psychology Ltd | Health & social care | 2026 |
| Another World Films Limited | Information & communication | 2022 |
| ANP Locum Services Limited | Health & social care | 2019 |
| ANS Digital Transformation Limited | Information & communication | 2020 |
| Ansa Property Solutions Ltd | Hospitality | 2024 |
| Ansandro Ltd | Wholesale & retail | 2024 |
| Ansen Media Ltd | Professional & scientific | 2022 |
| Ansong Askew Ltd | Mining & quarrying | 2020 |
| ANT Clausen Photography Ltd | Other services | 2007 |
| ANT Data Limited | Information & communication | 2015 |
| Antag Ltd | Health & social care | 2020 |
| Antares Securitys Ltd | Financial services | 2026 |
| Antavi Fruit U.K. Limited | Wholesale & retail | 2024 |
| Anteiku Ltd | Wholesale & retail | 2025 |
| Anterra Noble Homes Ltd | Real estate | 2025 |
| Anthonite Ltd | Information & communication | 2022 |
| Anthony & Susan Norris Trading Limited | Professional & scientific | 2018 |
| Anthony Barton Offshore Services Ltd | Mining & quarrying | 2025 |
| Anthony Boggan Kitchens Ltd | Construction | 2020 |
| Anthony Brennan & Co Ltd | Professional & scientific | 2019 |
| Anthony Davies Childhood Bereavement Ltd | Other services | 2024 |
| Anthony Global Ltd | Wholesale & retail | 2026 |
| Anthony James Property Services Ltd | Other services | 2024 |
| Anthony Joseph Travel Limited | Transport & logistics | 2026 |
| Anthony Kidd Properties Limited | Real estate | 2021 |
| Anthony Lacey Psychotherapy Limited | Health & social care | 2014 |
| Anthony Lackey Ltd | Construction | 2026 |
| Anthony LEO Russell Limited | Professional & scientific | 2026 |
| Anthony Menagh Ltd | Professional & scientific | 2025 |
| Anthony Shildhauer Limited | Construction | 2017 |
| Anthony Swift Limited | Wholesale & retail | 2010 |
| Anti Spike Straw Ltd | Manufacturing | 2022 |
| Anti-Aging & Organic Cares Ltd | Wholesale & retail | 2025 |
| Anti-Pest Environmental Services Limited | Administrative & support | 2024 |
| Antjohno Limited | Transport & logistics | 2018 |
| Antlia Energy Limited | Construction | 2019 |
| Anton DRG Ltd | Wholesale & retail | 2026 |
| Antonio Perduno Ltd | Transport & logistics | 2025 |
| Antony Fowler Limited | Arts & recreation | 2012 |
| Antony Ltd | Wholesale & retail | 2019 |
| Antony Stagg Ltd | Education | 2013 |
| Ants Property Sourcing Widnes Ltd | Real estate | 2015 |
| ANU Retail Ltd | Wholesale & retail | 2020 |