| Anthony Smith Accountancy Limited | Gloucestershire | 2003 |
| Anthony Smith Advertising Ltd | Richmond | 2006 |
| Anthony Smith HE Consulting Limited | Winchester | 2024 |
| Anthony Snowden Architect Limited | Doncaster | 2017 |
| Anthony Strathern Ltd | London | 2022 |
| Anthony Stroud Bloodstock Limited | Newmarket | 1986 |
| Anthony Swaine Architecture Limited | Hythe | 2011 |
| Anthony Systems Consulting Ltd | Gloucester | 2026 |
| Anthony Tierney Ltd | Kington | 2025 |
| Anthony Tory Limited | Abingdon | 2006 |
| Anthony Tyrer Holdings Limited | Wheatley | 2026 |
| Anthony Verduyn Limited | Solihull | 2022 |
| Anthony Ward Associates Limited | South Croydon | 2009 |
| Anthony Ward Partnership Limited | Oxford | 1999 |
| Anthony Wells Associates Limited | Hove | 2020 |
| Anthony Weston Limited | Faversham | 2013 |
| Anthony White Consulting Ltd | Moreton-In-Marsh | 2019 |
| Anthony Willett Limited | Horley | 2002 |
| Anthony Williams & Co. Limited | Redruth | 1992 |
| Anthony Wilson Associates Limited | London | 1983 |
| Anthony Woodward Consulting Limited | Colchester | 2024 |
| Anthony Wych & Co Limited | Stockport | 2021 |
| Anthony's Studio Limited | Bristol | 2007 |
| Anthonymelendrez Ltd | Hartlepool | 2022 |
| Anthoria Ltd. | Fleet | 2013 |
| Anthorn Control Systems Limited | Wirral | 2002 |
| Anthos Communications Limited | Northwich | 2019 |
| Anthos Consulting Ltd | Croydon | 2020 |
| Anthos Digital Ltd | Salford | 2024 |
| Anthoula Madden Ltd | Blackpool | 2017 |
| Anthracite Ltd | Aberdeen | 2026 |
| Anthracite Partners Limited | Bath | 2023 |
| Anthracity Limited | London | 2023 |
| Anthro Architecture Ltd | Leigh-On-Sea | 2022 |
| Anthro Bricolage Ltd | Livingston | 2024 |
| Anthro Fundraising Ltd | London | 2023 |
| Anthroengineering Consulting Ltd | Nottingham | 2025 |
| Anthroenology Ltd | Cambridge | 2016 |
| Anthrologica Ltd | Banbury | 2012 |
| Anthrologica Plus Ltd | Banbury | 2019 |
| Anthromachine Ltd | Wetherby | 2021 |
| Anthrometric Solutions Limited | Guildford | 2025 |
| Anthromod Ltd | Sutton | 2011 |
| Anthronexus Ltd | Canterbury | 1999 |
| Anthrop Capital Limited | Hull | 2010 |
| Anthrope Limited | Cambridge | 2003 |
| Anthropia Limited | London | 2025 |
| Anthropocene Consulting Insights Limited | Ripon | 2025 |
| Anthropocene Consulting Limited | London | 2017 |
| Anthropocene Ltd | Barking | 2017 |
| Anthropoid Creatives Ltd | London | 2019 |
| Anthropologie One Limited | London | 2024 |
| Anthropology Applied Limited | Norwich | 1989 |
| Anthropology Knowledge Associates Limited | Chichester | 2022 |
| Anthropos Digital Limited | London | 2017 |
| Anthropos Initiatives | Cambridge | 2025 |
| Anthropos Solutions Driven International Ltd | Bathgate | 2020 |
| Anthropulse Limited | London | 2026 |
| Anthrorg Ltd | Colchester | 2023 |
| Anthros Advisory Limited | Workington | 2026 |
| Anthro{Nation} Ltd | London | 2021 |
| Anthurium Services Limited | Edenbridge | 2017 |
| Anthysa Limited | Wimborne | 2024 |
| Anti Aging Medical Group Ltd | Stockport | 2023 |
| Anti Average Ltd | Wilmslow | 2011 |
| Anti BIO Technologies PTY Ltd | London | 2024 |
| Anti Corrosion - Europe Ltd | Preston | 2011 |
| Anti Hippo Limited | Potters Bar | 2025 |
| Anti Money Laundering Professionals Limited | King'S Lynn | 2009 |
| Anti Ordinary Ltd | Bromsgrove | 2021 |
| Anti Social Limited | London | 2026 |
| Anti Trafficking and Labour Exploitation Unit (Atleu) Limited | London | 2012 |
| Anti Vandal Shutters Limited | Hull | 2004 |
| Anti-Crime Security Services Limited | Nuneaton | 2002 |
| Anti-Friction Technology Limited | Cheltenham | 2001 |
| Anti-Ligature Shop Ltd | Warrington | 2012 |
| Anti-Money Laundering Compliance Company Limited | Lutterworth | 2002 |
| Anti-Money Laundering Ltd | London | 2016 |
| Anti-Racist Alliance Trust | Harrow | 2000 |
| Anti-Slavery International | London | 1995 |
| Anti-Slip Ltd | St. Helens | 2012 |
| Anti-Stress Accounting & Co Limited | Romford | 2018 |
| Anti-Terror Academy Ltd | London | 2025 |
| Anti-Trafficking Ltd | Croydon | 2026 |
| Antiaccident Limited | Chesterfield | 2023 |
| Antiagency Ltd | London | 2025 |
| Antiagenda Limited | Maidstone | 2025 |
| Antibes Design Limited | Birmingham | 2024 |
| Antibia Limited | London | 2016 |
| Antibo's (Leicester) Limited | Sheffield | 1998 |
| Antibodies.Com Limited | Cambridge | 2015 |
| Antibody Analytics Limited | Motherwell | 2015 |
| Antibody Applications Limited | Macclesfield | 2009 |
| Antibody Design Ltd | London | 2022 |
| Antic Animation Limited | Orpington | 2008 |
| Anticimex UK Holding Limited | Altrincham | 2022 |
| Anticipate Ltd | Bristol | 2007 |
| Anticline CS Ltd | Otley | 2019 |
| Anticonformity Limited | London | 2017 |
| Anticryptofraudattorney Ltd | London | 2025 |