| Anglian Pipework Ltd | Professional & scientific | 2022 |
| Anglian Planning Services Limited | Professional & scientific | 2008 |
| Anglian Plant Limited | Wholesale & retail | 2009 |
| Anglian Property and Grounds Maintenance Ltd | Construction | 2023 |
| Anglian Range Cookers Ltd | Other services | 2017 |
| Anglian Recruitment Limited | Administrative & support | 2025 |
| Anglian Safety Training Limited | Education | 2018 |
| Anglian Scaffold Limited | Professional & scientific | 2011 |
| Anglian Services Limited | Professional & scientific | 1986 |
| Anglian Smart Homes Limited | Professional & scientific | 2021 |
| Anglian Solar Thermal Limited | Professional & scientific | 1994 |
| Anglian Timber Frames Limited | Construction | 2020 |
| Anglian Tool Agency Limited | Wholesale & retail | 2015 |
| Anglian Transport Limited | Transport & logistics | 2021 |
| Anglian Tree Solutions Limited | Administrative & support | 2012 |
| Anglian Window Centres Limited | Extraterritorial | 1990 |
| Anglian Windows Limited | Professional & scientific | 2011 |
| Anglianhaul Ltd | Transport & logistics | 2023 |
| Angliian Smarttech Ltd | Construction | 2026 |
| Angling Direct PLC | Wholesale & retail | 2004 |
| Anglo Australian Taxation Services Ltd | Professional & scientific | 2013 |
| Anglo Classic Car Parts Ltd | Wholesale & retail | 2019 |
| Anglo-Celtic Holdings Ltd | Financial services | 2021 |
| Anguipede Limited | Information & communication | 2018 |
| Anguish's Educational Foundation | Other services | 2015 |
| Angy Ltd | Transport & logistics | 2016 |
| Anilan Ltd | Real estate | 2023 |
| Animal Healing With Lisa Limited | Agriculture & fishing | 2010 |
| Animal Inns Limited | Hospitality | 2011 |
| Animate Production Ltd | Professional & scientific | 2010 |
| Animate Social Care Ltd | Health & social care | 2026 |
| Animo Global Limited | Professional & scientific | 2018 |
| Anker of Coates (Ellington) Limited | Extraterritorial | 2013 |
| Anker of Coates Limited | Extraterritorial | 2013 |
| Anker Shipping Ltd | Transport & logistics | 2017 |
| Ankion Digital Ltd | Wholesale & retail | 2021 |
| Ankose CIC | Wholesale & retail | 2023 |
| ANM Sales Ltd | Wholesale & retail | 2008 |
| Anmilove Ltd | Health & social care | 2016 |
| ANN Emory Edwards Ltd | Real estate | 2024 |
| ANN USA Nails Ltd | Other services | 2011 |
| Anna Duttson Events Ltd | Hospitality | 2007 |
| Anna Mace Ltd | Professional & scientific | 2018 |
| Anna's Antiques Ltd | Wholesale & retail | 2024 |
| Annahigh Consultancy Limited | Construction | 2007 |
| Annesley House Hotel Limited | Hospitality | 2026 |
| Annie Pineau Ltd | Other services | 2019 |
| Annie's at the Boathouse Limited | Hospitality | 2002 |
| Annies Townhouse Ltd | Wholesale & retail | 2024 |
| Anniew Associates Ltd | Administrative & support | 2019 |
| Annie’S Property Management Limited | Real estate | 2023 |
| Annis Group Ltd | Financial services | 2024 |
| Annydave Ltd | Other services | 2025 |
| Another England Limited | Professional & scientific | 2020 |
| ANS Line Ltd | Information & communication | 2025 |
| Ansbk Trading Ltd | Wholesale & retail | 2021 |
| Anson Timberworks Limited | Construction | 2009 |
| Anstar Rail Limited | Professional & scientific | 2017 |
| Anstey Early Learning Pre-School Ltd | Education | 2012 |
| ANT Applied New Technologies UK Limited | Manufacturing | 2023 |
| ANT Skrim Ltd | Information & communication | 2018 |
| Antea Group UK Holding Limited | Financial services | 2023 |
| Antea Group UK Limited | Professional & scientific | 2023 |
| Anteros Arts Limited | Arts & recreation | 2010 |
| Anthony Hull Plumbing & Heating Limited | Other services | 2003 |
| Anthony Hunt Consultancy Limited | Financial services | 2022 |
| Anthony James Removals Limited | Transport & logistics | 2010 |
| Anthony Paulo Interiors Limited | Manufacturing | 2019 |
| Anthony Seaman & Sons Limited | Agriculture & fishing | 1954 |
| Anthopec Ltd | Information & communication | 2017 |
| Anthropology Applied Limited | Professional & scientific | 1989 |
| Antica Trattoria Limited | Hospitality | 2018 |
| Antikythera Capital | Financial services | 2018 |
| Antilo UK Limited | Transport & logistics | 2014 |
| Antingham Estates Limited | Administrative & support | 2012 |
| Antique Holdings Ltd | Extraterritorial | 2023 |
| Antonio Courier Services Ltd | Transport & logistics | 2026 |
| Antosilva Ltd | Administrative & support | 2017 |
| Antov Transport Services Ltd | Transport & logistics | 2024 |
| Antrim Care Services Limited | Health & social care | 2004 |
| Ants Theatre Ltd | Arts & recreation | 2020 |
| Anvald Technology Solutions Ltd | Professional & scientific | 2023 |
| Anvil SFX Ltd | Manufacturing | 2024 |
| ANY ODD JOB Limited | Information & communication | 2014 |
| Anya Photo Ltd | Other services | 2013 |
| Anycar Limited | Transport & logistics | 2025 |
| Anysta Ltd | Transport & logistics | 2017 |
| Anything Else Limited | Wholesale & retail | 2020 |
| Anytime Solutions Ltd | Construction | 2022 |
| AOE Ltd | Information & communication | 2021 |
| AP Communications Ltd | Construction | 2023 |
| APC Crafts Ltd | Manufacturing | 2025 |
| APC Pest Control Limited | Administrative & support | 2015 |
| Aperiosdesign Ltd | Arts & recreation | 2018 |
| Apertum Associates Limited | Administrative & support | 2008 |
| Apex Cosmetics Ltd | Other services | 2019 |
| Apex Electrical Norfolk Ltd | Construction | 2025 |
| Apex Financial Solutions Ltd | Administrative & support | 2018 |
| Apex Injury Clinic Ltd | Health & social care | 2022 |
| Apex Investments Limited | Real estate | 1998 |