| AN Properties (Luton) Limited | Real estate | 2025 |
| AN Services Group Ltd | Administrative & support | 2014 |
| AN Transport Services Ltd | Transport & logistics | 2026 |
| An-Nahla Ltd | Education | 2025 |
| An-Noor Education Ltd | Education | 2023 |
| ANA Consultancy Ltd | Other services | 2018 |
| ANA Driving Ltd | Transport & logistics | 2024 |
| ANA Nico Ltd | Health & social care | 2014 |
| ANA Removals Limited | Transport & logistics | 2025 |
| Ana-Mariasmn Ltd | Wholesale & retail | 2022 |
| Anaderol Ltd | Financial services | 2024 |
| Anahat Construction Limited | Construction | 2025 |
| Anais Kataleya Ltd | Construction | 2026 |
| Analysis Tech Limited | Professional & scientific | 2015 |
| Analyst Ally Ltd | Professional & scientific | 2025 |
| Anamoto Ltd | Wholesale & retail | 2021 |
| Anando Cuisine Ltd | Hospitality | 2025 |
| Anariem Ltd | Professional & scientific | 2022 |
| Anas & Co Services Ltd | Construction | 2025 |
| Anas Holdings Limited | Administrative & support | 2023 |
| Anas Services Ltd | Administrative & support | 2018 |
| Anaya Fashions Ltd | Wholesale & retail | 2022 |
| Anaya Medical Ltd | Other services | 2025 |
| Anayaz Ltd | Wholesale & retail | 2023 |
| Ancells Fish and Chips Limited | Hospitality | 2002 |
| Anchorage Security Services Ltd | Financial services | 2020 |
| Anchorgoods Limited | Wholesale & retail | 2025 |
| Anchorite Films Limited | Information & communication | 2026 |
| AND Car Service Ltd | Wholesale & retail | 2022 |
| Andalex Vila Ltd | Real estate | 2025 |
| Andaluz Ltd | Wholesale & retail | 2025 |
| Anderson and Sons Windscreens Limited | Wholesale & retail | 2022 |
| Anderson Choice Limited | Administrative & support | 2014 |
| Anderson Elite Limited | Administrative & support | 2013 |
| Anderson Marketing Limited | Administrative & support | 2004 |
| Andes Cleaners Ltd | Administrative & support | 2021 |
| Andgo Taxi Ltd | Transport & logistics | 2026 |
| Andi BK Services Limited | Professional & scientific | 2007 |
| Andikan Healthcare Services Limited | Public administration | 2025 |
| Andpro Logistics Limited | Transport & logistics | 2023 |
| Andra in Ltd | Hospitality | 2018 |
| Andre Car Bodyshop Ltd | Wholesale & retail | 2021 |
| Andrea Taylor Limited | Real estate | 2009 |
| Andrea’S Animals Ltd | Administrative & support | 2024 |
| Andreea Cleaning A-Z Ltd | Administrative & support | 2025 |
| Andreea Limited | Construction | 2007 |
| Andreea Logistics Ltd | Transport & logistics | 2017 |
| Andrei Removals Ltd | Transport & logistics | 2026 |
| Andrew & Sons Companies Ltd | Health & social care | 2018 |
| Andrew and SON Home Improvements Ltd | Construction | 2021 |
| Andrew Fugle Ltd | Professional & scientific | 2015 |
| Andrews of Kimpton Limited | Administrative & support | 2021 |
| Andrews UK Limited | Information & communication | 2000 |
| Andries Logistics Ltd | Transport & logistics | 2019 |
| Andrius Ceramic Tiling Limited | Construction | 2014 |
| Andromeda Health U.K. Ltd | Information & communication | 2023 |
| Androx Spedition Ltd | Transport & logistics | 2023 |
| Andrusiac Ltd | Construction | 2023 |
| Andrzej Banasiak Ltd | Transport & logistics | 2014 |
| Andy Ball Services Ltd | Construction | 2014 |
| Andy's Garage Ltd | Wholesale & retail | 2023 |
| Anees Limited | Other services | 2015 |
| Anelisse Roberta's Towers Ltd | Transport & logistics | 2018 |
| Anellog Limited | Transport & logistics | 2015 |
| Aneqaas Ltd | Wholesale & retail | 2025 |
| Anfd Limited | Other services | 2017 |
| ANG Builders Ltd | Construction | 2016 |
| ANG Tech Limited | Construction | 2024 |
| Angel Hair Atelier Ltd | Other services | 2020 |
| Angel Kidz Nursery & Preschool Limited | Education | 2014 |
| Angel Property Partners Ltd | Construction | 2025 |
| Angel's Group Limited | Construction | 2022 |
| Angelic Bathrooms Limited | Wholesale & retail | 2022 |
| Angels at Home Limited | Administrative & support | 2023 |
| Angels Home Care Group Ltd | Health & social care | 2026 |
| Angler Fishes Ltd | Wholesale & retail | 2025 |
| Anglesea Terrace Orthodontic Practice Ltd | Health & social care | 2012 |
| Angleshire Surveying Limited | Professional & scientific | 2025 |
| Anglia Contract Services Ltd | Administrative & support | 2019 |
| Anglo Oriental Import, Export, & Distribution Co. Ltd | Wholesale & retail | 2020 |
| Anica Services Ltd | Transport & logistics | 2022 |
| Animal Tent and Food International Limited | Manufacturing | 2025 |
| Aniqa Beauty Studio Ltd | Other services | 2026 |
| Aniridco Limited | Wholesale & retail | 2024 |
| Anis Transport Limited | Transport & logistics | 2018 |
| Anita Cleaning Services Herts & Beds Ltd | Administrative & support | 2019 |
| Anji (UK) Solar Pumps Ltd | Manufacturing | 2021 |
| Anjum Services Limited | Wholesale & retail | 2025 |
| Anjuna Devi Ltd | Households | 2023 |
| ANK Investments Ltd | Other services | 2015 |
| Ankh Medic Limited | Education | 2024 |
| ANM Ltd | Wholesale & retail | 2026 |
| ANM Tech Studio Limited | Professional & scientific | 2023 |
| Anmb Properties Limited | Real estate | 2023 |
| ANN Engineering Ltd | Construction | 2024 |
| ANN Terry Limited | Households | 1936 |
| Anna Mara Aesthetics Limited | Other services | 2023 |
| Anna Obst Productions Ltd | Information & communication | 2018 |
| Annapurna Ltd | Wholesale & retail | 2026 |
| Annbutik Plussize Ltd | Wholesale & retail | 2025 |