| Anwar Buffe Restaurang Limited | London | 2024 |
| Anwar Property and Investments Limited | Harrow | 2017 |
| Anxiety Bgone Ltd | Leicester | 2022 |
| Anxin Jingyuan Trading Co., Ltd | Stafford, | 2012 |
| ANY Old Icon Limited | Brighton | 2005 |
| ANY Old Ironing Limited | London | 2022 |
| ANY Pond Limited | Daventry | 2023 |
| ANY Spec Limited | Milton Keynes | 2016 |
| ANY TOM Dick & Harry Limited | Birmingham | 2024 |
| Anya Dawn Renshaw Ltd | Tregaron | 2021 |
| Anya Kaur Bhatoa Ltd | Birmingham | 2024 |
| Anyarin Limited | London | 2007 |
| Anycast 03 Ltd | London, Southgate | 2006 |
| Anycastle Limited | Battle | 1987 |
| Anycomp 2017 Limited | London | 2017 |
| Anydiy Auto Co., Ltd | Beckenham | 2015 |
| Anyki Ltd | London | 2019 |
| Anymix Limited | Birmingham | 1930 |
| Anyname Limited | North Lincolnshire | 2001 |
| Anyone Waiting Ltd | Llanelli | 2021 |
| Anysharp Limited | Dundee | 2004 |
| Anyspare Limited | Sutton-In-Ashfield | 2003 |
| Anystore Ltd | Gillingham | 2019 |
| Anything Assist Ltd | Romford | 2023 |
| Anything Print Limited | Ipswich | 2015 |
| Anything Studio International Ltd | Beckenham | 2016 |
| Anytime Health Care and Cleaners Ltd | Walsall | 2019 |
| Anytime Ventures (Aldgate) Limited | Petersfield | 2021 |
| Anytime Ventures (Bloomsbury) Limited | Petersfield | 2021 |
| Anytimewatch Limited | London | 2019 |
| Anyvate Ltd | London | 2023 |
| Anyways Creative Limited | London | 2011 |
| Anywhere Limited | Warrington | 2001 |
| Anzinc Co., Ltd | Suffolk | 2013 |
| AO B2B Limited | Bolton | 2019 |
| AO Business Limited | Bolton | 2019 |
| AO Care Limited | Bolton | 2019 |
| AO Club Limited | Bolton | 2019 |
| AO Distribution Limited | Bolton | 2019 |
| AO JIU Wang Co., Ltd | Manchester | 2024 |
| AO Logistics Limited | Bolton | 2020 |
| AO Premium Club Limited | Bolton | 2019 |
| AO Rental Limited | Bolton | 2019 |
| AO Trade Limited | Bolton | 2019 |
| AOA Holdings III UK Limited | London | 2022 |
| AOB Marine Limited | Stanford-Le-Hope | 2012 |
| AOC International Limited | Aberdeen | 1976 |
| Aodoroa Medical Aesthetics LAB Ltd | West Midlands, England | 2023 |
| Aoearth Foundation Limited | Cambridge | 2025 |
| AOG Alliance (UAE) Limited | London | 2013 |
| AOG Freight Limited | Poole | 2011 |
| AOG Ltd | Winchmore Hill | 2024 |
| AOG Support Limited | Stevenage | 2015 |
| AON UK Trustees Limited | London | 1999 |
| Aone Industrial Co., Ltd | Beckenham | 2014 |
| Aoneuk Globalfood Limited | Southampton | 2022 |
| Aopuno (UK) International Import & Emport Ltd | Beckenham | 2020 |
| Aorangi 101 Limited | London | 2003 |
| Aoredo Ltd | London | 2024 |
| Aortech International Limited | Irvine | 2020 |
| AOS Property Management Limited | Manchester | 2022 |
| AOS Property Services Limited | London | 2009 |
| AOS Renewables Limited | Waltham Cross | 2012 |
| AOT Travel Ltd | Nottingham | 2006 |
| Aovopro Scooter Co., Ltd | East Ham | 2020 |
| AOW Carpentry Ltd | Wimborne | 2020 |
| Aowei Group UK Co., Ltd. | Weston-Super-Mare | 2020 |
| Aoxna Limited | Reading | 2023 |
| AP Carlson Ltd | Bristol | 2023 |
| AP Consultare Ltd | Morden | 2018 |
| AP Dove Limited | Portsmouth | 2024 |
| AP Filmworks Ltd | London | 2020 |
| AP Jewellery Company Limited | Bexleyheath | 2013 |
| AP Ltd | Newmarket | 2009 |
| AP Marketing Ltd | London | 2025 |
| AP North West Limited | Wigan | 2013 |
| AP Runoff Limited | London | 2006 |
| AP Strategy Ltd | London | 2024 |
| AP21 Ltd. | London | 2014 |
| APA Water Resources Limited | Chorley | 2012 |
| Apac Packaging Limited | Loughborough | 2014 |
| Apacare Group Limited | Beckenham | 2020 |
| Apache Auto Limited | Leeds | 2023 |
| Apal Inc Ltd | London | 2021 |
| Apam London Limited | London | 2006 |
| Apartel Limited | Burnley | 2014 |
| Aparthotel Investments Limited | Bristol | 2018 |
| Apartment 17 Limited | London | 2004 |
| Apartment Avenue Ltd | Halesowen | 2024 |
| APB Alloys Limited | Stonehouse | 2002 |
| APC Distribution Limited | St. Helens | 2024 |
| APC Jobs Limited | Surbiton | 2006 |
| APD23 Ltd | Malmesbury | 2023 |
| Apdgroundworks Ltd | Great Yarmouth | 2024 |
| APE Culture Brand Alliance Limited | Beckenham | 2020 |
| APE Rescue Trust | Southampton | 1999 |
| Apea Truck & Trailer Parts Ltd | Lisburn | 2013 |
| Aped Group Ltd | London | 2018 |
| Apei UK Limited | Halifax | 2003 |
| Apeiron Properties Limited | Salford Quays | 2002 |