| ANT & DEC Productions Limited | London | 2000 |
| ANT & SEB Ltd | Barry | 2025 |
| ANT Carver Limited | Buckingham | 2013 |
| ANT MAN Productions Ltd | Cambridge | 2023 |
| ANT Soup Limited | Clackmannan | 2023 |
| Anta Band Ltd | Bristol | 2024 |
| Antaeus Graffiti Limited | London | 2010 |
| Antagonist Studios Ltd | London | 2022 |
| Antand Art Ltd | London | 2026 |
| Antarctic Palmtrees Ltd | London | 2013 |
| Antares Productions Ltd | Oxford | 2023 |
| Antastic Ltd | London | 2012 |
| Antcfitness Ltd | Runcorn | 2026 |
| Antelope Motor Cycle Club (Coventry) Limited(The) | Kenilworth | 1952 |
| Antenna Music Limited | Stroud | 2013 |
| Antenna Studios Limited | London | 2002 |
| Anteros Arts Limited | Norwich | 2010 |
| Anthea Represents Ltd | London | 2021 |
| Anthem Events Ltd | Whitland | 2023 |
| Anthem Function Band Ltd | Hemel Hempstead | 2024 |
| Anthem Global Sports Management Limited | London | 2020 |
| Anthem London Ltd | Weybridge | 2025 |
| Anthem Music CIC | London | 2022 |
| Anther&Style Limited | Bedford | 2014 |
| Anthm Limited | London | 2017 |
| Anthologie Tattoo Ltd | Leeds | 2019 |
| Anthology Theatre Productions Limited | London | 2015 |
| Anthony Ace Smith Ltd | Dudley | 2024 |
| Anthony Ayres Motorsport Limited | London | 2011 |
| Anthony Banks Limited | London | 1973 |
| Anthony Bruton Limited | Middlesex | 2013 |
| Anthony Clifford Studios Limited | Hornchurch | 2003 |
| Anthony Condon Showjumping Limited | Whitchurch | 2011 |
| Anthony Crolla Schools Boxing Limited | Manchester | 2020 |
| Anthony D.Harris & Sons Leisure Limited | Lichfield | 1975 |
| Anthony Edwin Limited | Kent | 2003 |
| Anthony Emeka Sports Ltd | London | 2024 |
| Anthony Field Associates Limited | London | 2006 |
| Anthony Garratt Ltd | Otford | 2004 |
| Anthony Groves Design Limited | London | 1990 |
| Anthony Haste Golf Ltd | Derby | 2017 |
| Anthony Hopkins Limited | Ballyclare | 2025 |
| Anthony J Abraham Ltd | London | 2023 |
| Anthony Lo-Giudice Dance Theatre Limited | North Shields | 2026 |
| Anthony Martin Interior Design Ltd | Shipley | 2016 |
| Anthony Meindl's Actor Workshop Ltd | London | 2017 |
| Anthony Millar Golf Limited | Lymm | 2008 |
| Anthony Oxford Fit Hub Limited | Keighley | 2024 |
| Anthony P Norris Ltd | Bromley | 2019 |
| Anthony Pullen Personal Training Ltd | Nuneaton | 2019 |
| Anthony Rule Illustration Limited | Nottingham | 2017 |
| Anthony Shaw Leisure Unlimited | Hull | 1980 |
| Anthony Shepherd Creative Ltd | Bury St. Edmunds | 2023 |
| Anthony Sieben Ltd | Aldershot | 2020 |
| Anthony the Witness Ltd | Manchester | 2024 |
| Anthony Thompson (Trumpet) Limited | Castleford | 1998 |
| Anthony Thompson Limited | Chandlers Ford | 2023 |
| Anthony Wilkinson Gallery Ltd | London | 2017 |
| Anthony Young Studios Ltd | London | 2022 |
| Anthonykoskymanagement Ltd | Virginia Water | 2024 |
| Anthos Ltd | Bedford | 2018 |
| Anthro Contrology Limited | London | 2020 |
| Anti-Clone Ltd | London | 2024 |
| Anti-Hero Ltd | Cambridge | 2024 |
| Antic Hare Ltd | London | 2015 |
| Antidote Booking Ltd | Paisley | 2017 |
| Antidote Fitness Limited | London | 2022 |
| Antifragile by Dmpt Ltd | London | 2022 |
| Antivenin Games Ltd | Brighton | 2023 |
| Antoine Multimedia Limited | Borehamwood | 2014 |
| Anton Films Limited | Warminster | 1974 |
| Anton Invicta Ltd | Bristol | 2023 |
| Anton Tattoo Art Limited | Cheltenham | 2025 |
| Antonia Hoyle Limited | Waltham Abbey | 2019 |
| Antonia Lisca Ltd | Luton | 2024 |
| Antonina Minova Art Ltd | London | 2025 |
| Antonio Ferreira Ltd | London | 2018 |
| Antonio Santorelli Black Belt Academy Limited | Cradley Heath | 2005 |
| Antonio Tarsis Ltd | London | 2023 |
| Antony Dufort Limited | Gloucester | 2009 |
| Antony Fowler Limited | Liverpool | 2012 |
| Antony Haylock Studios Limited | Hertfordshire | 2003 |
| Antony JAY Productions Limited | Langport | 1988 |
| Antony Reeves Ltd | Epsom | 2017 |
| Antony Rhythm Studios Ltd | Wigston | 2024 |
| Antrim Rovers Football Club Limited | Antrim | 2023 |
| Antrim Sports Club Ltd | Carrickfergus | 2020 |
| Antrobus Golf Club Limited | | 1993 |
| Antron Limited | Sw17 | 1994 |
| Antropia CIC | London | 2025 |
| Ants Inya Pants Limited | (Off Newport Road) | 2008 |
| Ants Theatre Ltd | Norwich | 2020 |
| Antur Llain Limited | Llantwit Major | 2018 |
| Anturfit Ltd | Burry Port | 2019 |
| Antz in Your Pantz Ltd | Altrincham | 2020 |
| Antzs PVT Ltd | Maidstone | 2016 |
| Anubis Pictures Ltd | London | 2021 |
| Anufitness Ltd | London | 2025 |
| Anusa Creatives Ltd | London | 2021 |
| Anusha Loves Parties Ltd | London | 2023 |