| A S N D Ltd | Adlington | 2024 |
| A S Private Fitness Ltd | London | 2017 |
| A Sarlas Racing Team Ltd | Twickenham | 2026 |
| A Sculpture Ltd | Bristol | 2023 |
| A Sehgal Coaching Ltd | Edinburgh | 2025 |
| A Sense of Place Ltd | Weymouth | 2024 |
| A Single Line Productions Ltd | London | 2024 |
| A Single Thread CIC | Bristol | 2021 |
| A Space for Art Ltd. | Leicester | 2012 |
| A Space to Make Ltd | Deeside | 2026 |
| A Space: Growing Creative Communities Ltd | Southampton | 2009 |
| A Spirit to Serve Events Ltd | Falkirk | 2018 |
| A Splinter of Hope CIC | St. Ives | 2023 |
| A Spoonful of Sugar and Co UK Ltd | Worcester Park | 2015 |
| A Squire Limited | London | 2023 |
| A Stab in the Dark Murder Mysteries Limited | Coventry | 2012 |
| A Star Ballerz Coaching Ltd | Waltham Abbey | 2020 |
| A Star Bouncy Castles Ltd | Rothley | 2016 |
| A Star Danced Limited | Littlehampton | 2023 |
| A Star Experience Limited | Shepperton | 2021 |
| A Star Fitness Limited | Hatfield | 2019 |
| A Star Leisure Ltd | Chesterfield | 2006 |
| A Star Sports Development C.I.C. | Nottingham | 2017 |
| A Star Sports Management Limited | Manchester | 2025 |
| A Star Tattoos Parlour Ltd | Chessington | 2024 |
| A Star Touring Ltd | Stourbridge | 2024 |
| A Storry Ltd | London | 2019 |
| A Story to Tell Ltd | Hebburn | 2025 |
| A T Amusements Ltd | Hemel Hempstead | 2024 |
| A T Craig Limited | Stoke-On-Trent | 2001 |
| A T Sport Services Limited | Ipswich | 2018 |
| A TAI Sports Management Limited | Ipswich | 2020 |
| A Tall Order Limited | Farnham | 2007 |
| A Taste of Salsa Limited | Ilford | 2026 |
| A Team Fitness Ltd | Northolt | 2022 |
| A Theatre (for NOW) CIC | Sheffield | 2026 |
| A Thing of the Past Ltd | Guildford | 2013 |
| A Thomas M/A Ltd | Exeter | 2017 |
| A Thomson Illustration Ltd | Guildford | 2018 |
| A Thousand Lives Ltd | London | 2025 |
| A Thousand Stars Ltd | Bexleyheath | 2026 |
| A Throw of Dice Touring Limited | London | 2006 |
| A Time of Monsters Production Limited | Edgware | 2021 |
| A Time to Breathe Limited | Dereham | 2015 |
| A to V Limited | Manchester | 2002 |
| A to Z Fitness Ltd | St. Leonards-On-Sea | 2017 |
| A Touch of Luxe Ltd | Sutton Coldfield | 2022 |
| A Tribe Called Sweat Ltd | Orpington | 2016 |
| A Type of Design Limited | Reading | 2014 |
| A Unique U Ltd | Welling | 2024 |
| A Very Naughty Christmas UK Ltd | London | 2024 |
| A Void Collective CIC | Northampton | 2026 |
| A Voyage Round My Father Limited | Bath | 2023 |
| A W Conditioning Limited | Bournemouth | 2009 |
| A W Equestrian Services Ltd | Halifax | 2018 |
| A W Kickboxing Ltd | Birmingham | 2023 |
| A Watson Creative Limited | Sale | 2010 |
| A Way With Media Productions Limited | Bromsgrove | 2017 |
| A White Events Limited | Mold | 2012 |
| A Whole Different World Ltd | London | 2020 |
| A Will and a Way Limited | Leigh | 2002 |
| A Will Works Limited | Norwich | 2019 |
| A Word in Your EAR Writing Ltd | Bath | 2012 |
| A Working Class ACT CIC | Manchester | 2026 |
| A Y Music Limited | Cranleigh | 2009 |
| A Younger Theatre Ltd | Hull | 2013 |
| A Zeldin Theatre Company Ltd | London | 2019 |
| A&A Art and Investments Ltd | London | 2026 |
| A&A Sports Management Ltd | Liverpool | 2020 |
| A&Atinydetails Ltd | London | 2026 |
| A&B Custom Solutions Ltd | London | 2026 |
| A&C Interior Design Limited | London | 2013 |
| A&C Promotions Ltd | Norwich | 2018 |
| A&D Dolan Ltd | Ipswich | 2015 |
| A&G Leith Limited | Glasgow | 2013 |
| A&G Records Limited | | 2006 |
| A&G Songs Limited | | 2006 |
| A&H Events Ltd | Barnet | 2018 |
| A&H Sports Limited | Nottingham | 2012 |
| A&J Events and Promotions Limited | Woodbridge | 2026 |
| A&M D'S Limited | Derby | 2021 |
| A&M Ents Ltd | Newcastle Upon Tyne | 2018 |
| A&N Productions Limited | Tring | 2017 |
| A&P Artist Management Ltd | London | 2012 |
| A&P Design and Build Limited | Banbury | 2024 |
| A&P Entertainment Ltd | Horsham | 2021 |
| A&P Events Ltd | Aberdeen | 2025 |
| A&P Fitness Ltd | Newbury | 2024 |
| A&S Fitness (Lichfield) Ltd | Lichfield | 2014 |
| A&S Wellness and Success Ltd | Watford | 2022 |
| A&Y Entertainment Limited | Glasgow | 2018 |
| A'Miga Gymnastics Ltd | London | 2025 |
| A'S Soft Play Centre Ltd | London | 2018 |
| A-A Bros Racing Limited | Northampton | 2022 |
| A-Design Limited | Eastbourne | 1995 |
| A-Gain Fitness Limited | Stanford-Le-Hope | 2024 |
| A-K Car Park Limited | London | 2013 |
| A-Light Sound and Light Ltd | Oldham | 2019 |
| A-List Card UK Limited | Brentwood | 2024 |
| A-List Studio Limited | London | 2024 |