| Anglo American Line Limited | Transport & logistics | 1986 |
| Anglo Building Services Limited | Construction | 2015 |
| Anglo Commercial Enterprises Ltd | Professional & scientific | 2018 |
| Anglo Developments Limited | Construction | 2018 |
| Anglo Estates Limited | Construction | 2003 |
| Anglo Europe Aviation Limited | Transport & logistics | 2011 |
| Anglo International Express Ltd | Transport & logistics | 2003 |
| Anglo Roofing Ltd | Construction | 2011 |
| Anglo-Pacific Engineering Limited | Professional & scientific | 1996 |
| Angus Holdings Ltd | Extraterritorial | 2021 |
| Angus Investments Limited | Administrative & support | 2017 |
| ANI After School Club Ltd | Education | 2021 |
| Anii Tasty Takeaway Ltd | Hospitality | 2023 |
| Anika Aggarwal Ltd | Health & social care | 2014 |
| Anila Integrated Health Ltd | Health & social care | 2026 |
| Anima Education Ltd | Education | 2023 |
| Animal Healthcare Services Limited | Professional & scientific | 1999 |
| Animals at Home (Sheffield) Ltd | Other services | 2010 |
| Animated INK Ltd | Information & communication | 2006 |
| Animbloc Ltd | Information & communication | 2024 |
| Animitas Ltd | Information & communication | 2021 |
| Animo Inc Limited | Real estate | 2019 |
| Anirann Ltd | Manufacturing | 2022 |
| Anish Kumar Limited | Information & communication | 2022 |
| Anita Parkin Associates Limited | Professional & scientific | 2018 |
| Aniz Ltd | Hospitality | 2025 |
| Anjana B.S.A Ltd | Wholesale & retail | 2019 |
| Anjanan a Ltd | Wholesale & retail | 2022 |
| Anka Services Limited | Real estate | 2019 |
| Ankr Property Maintenance Ltd | Real estate | 2024 |
| Anlahan Properties Ltd | Professional & scientific | 2014 |
| ANN Brookman Interiors Limited | Other services | 2009 |
| Anna Aila Limited | Hospitality | 2024 |
| Anna and Elvis Healthcare Service's Limited | Health & social care | 2023 |
| Anna Armentano Ltd | Education | 2025 |
| Anna Builders Ltd | Construction | 2022 |
| Anna Griffiths Consulting Limited | Administrative & support | 2026 |
| Anna Hughes-Chamberlain Limited | Administrative & support | 2014 |
| Anna Letting Solutions Limited | Real estate | 2024 |
| Anna Maria Fitness Ltd | Education | 2022 |
| Anna Pham Academy of Nails Ltd | Other services | 2026 |
| Anna Reynolds Limited | Professional & scientific | 2013 |
| Anna Sofia Ltd | Hospitality | 2024 |
| Anna Sourcing Limited | Real estate | 2022 |
| Annabel Bates Limited | Arts & recreation | 2015 |
| Annabel Tindale Acupuncture Ltd | Health & social care | 2026 |
| Annabelle Caplan Limited | Real estate | 2006 |
| Annabel’S Properties Limited | Real estate | 2025 |
| Annamaria B. Sourcing Ltd | Administrative & support | 2023 |
| Annamaria B. Staycations Ltd | Real estate | 2023 |
| Annapurna Group Ltd | Hospitality | 2023 |
| Annapurna Ventures Limited | Real estate | 2020 |
| Annas Dravas Ltd | Wholesale & retail | 2020 |
| Annathesha Ltd | Wholesale & retail | 2026 |
| Anna’S Cafe Ltd | Hospitality | 2026 |
| Annelies Sarrazyn Ltd | Professional & scientific | 2011 |
| Annick Setting OUT Limited | Professional & scientific | 2024 |
| Annie Jude's Ltd | Wholesale & retail | 2021 |
| Annie's Sandwich Bar Ltd | Hospitality | 2023 |
| Anno Domini Ltd | Wholesale & retail | 2018 |
| Anomalous Freight Network Ltd | Extraterritorial | 2024 |
| Anomaly Arts Collective CIC | Arts & recreation | 2023 |
| Anoop & Nair Medical Services Limited | Real estate | 2019 |
| Another Daze Limited | Administrative & support | 2009 |
| Another Level Beauty Ltd | Other services | 2021 |
| Anpr International Limited | Transport & logistics | 2005 |
| Ansa Claims Limited | Administrative & support | 2023 |
| Ansdell Self Drive Ltd | Administrative & support | 2019 |
| Anseba Cafe Ltd | Hospitality | 2025 |
| Anston Contractors Ltd | Other services | 2013 |
| Anston Electrical Limited | Manufacturing | 2012 |
| Anston Engineering Services Limited | Professional & scientific | 2024 |
| Anston Food and Hygiene Consultants Limited | Professional & scientific | 2020 |
| Anston Healthcare Ltd | Wholesale & retail | 2025 |
| Anston Pest Control Ltd | Administrative & support | 2017 |
| Anston Physiotherapy Limited | Health & social care | 2011 |
| Answer Centric Ltd | Information & communication | 2017 |
| Answertree Ltd | Information & communication | 2023 |
| Ansys UK Limited | Information & communication | 2000 |
| ANT Digital Limited | Information & communication | 2010 |
| ANT Marketing Limited | Administrative & support | 1990 |
| ANT Properties Ltd | Real estate | 2022 |
| ANT Property Ltd | Real estate | 2019 |
| ANT Protect Limited | Financial services | 2010 |
| ANT Research Limited | Professional & scientific | 2005 |
| ANT WM Limited | Real estate | 2025 |
| ANT Yorkshire Limited | Wholesale & retail | 2014 |
| Antalya Barber S10 Limited | Other services | 2026 |
| Antao Physio Ltd | Health & social care | 2023 |
| Antebe Abebrese Company Limited | Households | 2024 |
| Anthony Andrews (Fishmongers) Limited | Wholesale & retail | 2002 |
| Anthony Currie Consulting Limited | Professional & scientific | 2026 |
| Anthony Ryan Media Limited | Information & communication | 2023 |
| Anthracite Technical Limited | Wholesale & retail | 2023 |
| Antibo's (Leicester) Limited | Professional & scientific | 1998 |
| Antico Food Place Ltd | Hospitality | 2022 |
| Antidote Coaching Club Limited | Education | 2023 |
| Antidotehairuk Limited | Other services | 2022 |
| Antler Food Ltd | Hospitality | 2023 |
| Antony Decorators Limited | Construction | 2008 |