| A Harmony Production Ltd | London | 2025 |
| A Hart Painting NOT Ltd | London | 2022 |
| A Hartland Ltd | London | 2022 |
| A I C (2019) Tour Ltd | London | 2019 |
| A I M Rail Consultants Limited | Castle Douglas | 2001 |
| A IS for Alphabet Limited | Banbury | 2013 |
| A J Cross Ltd | Birmingham | 2011 |
| A J E-Commerce Ltd | Wigan | 2014 |
| A J Events Services Ltd | Blackwood | 2019 |
| A J Graphic Design Limited | Gillingham | 2014 |
| A J Miller Limited | Scunthorpe | 2000 |
| A J P Creative Ltd | Honiton | 2019 |
| A J Promotions Ltd | Formby | 2011 |
| A J Smith Music Ltd | Stockport | 2019 |
| A J Williams Cheltenham Limited | Cheltenham | 2014 |
| A Jean Cake Production Ltd | Leeds | 2023 |
| A K Benedict Ltd | Eastbourne | 2013 |
| A K Casino Knights Limited | Ashford | 2007 |
| A K Watson Limited | Slough | 2014 |
| A Keshales Limited | London | 2018 |
| A L 10 Limited | Torquay | 2016 |
| A L B a JJ (Solihull) Ltd | Leamington Spa | 2024 |
| A L Beauty Clinic Ltd | Larkhall | 2010 |
| A L C Music Limited | Romford | 2008 |
| A L Racing Limited | Ipswich | 2011 |
| A L Sporting Ltd | Winchester | 2020 |
| A Leek Limited | Pevensey | 2026 |
| A Leisure Ltd | Hull | 2024 |
| A Lingard Ltd | Barnsley | 2017 |
| A List Live Ltd | London | 2026 |
| A Little Girls Dream Ltd | London | 2020 |
| A Little Longer Events Ltd | London | 2026 |
| A Little One for the Road Ltd | Manchester | 2008 |
| A Little RAY of Sunshine Limited | Bristol | 2014 |
| A Little Something by Sarah Ltd | London | 2014 |
| A Little Sound Music Ltd | Abingdon | 2023 |
| A Live Sound Ltd | Glasgow | 2012 |
| A Lone Star Ltd | London | 2025 |
| A Lost Dog Film Ltd | London | 2025 |
| A Love Supreme (Operations) Limited | London | 2021 |
| A Love Supreme Limited | London | 2021 |
| A M Challis Trust Ltd | Cambridge | 2008 |
| A M Conservation Ltd | Durham | 2025 |
| A M Gym Ltd | Macclesfield | 2022 |
| A M K Motorsport Limited | Market Harborough | 2013 |
| A M L Enterprises Limited | Fareham | 2012 |
| A M Touring Limited | London | 2010 |
| A Magic Place Ltd | Berkhamsted | 2020 |
| A Maher Leisure Limited | Liverpool | 2024 |
| A Method Ltd | London | 2018 |
| A Midlands Collaboration Ltd | Birmingham | 2025 |
| A Mighty Lamb Production Limited | Wymondham | 2024 |
| A Mikey Idea Limited | London | 2025 |
| A Million Dreams Sleepover Ltd | Bexhill-On-Sea | 2019 |
| A Million Dreamz Events Limited | Birmingham | 2021 |
| A Million Freds Productions Limited | London | 1998 |
| A Mind to Perform Ltd | Oakham | 2009 |
| A Minor Ltd | Bristol | 2014 |
| A Monkman PT Ltd | Kirkwall | 2025 |
| A Motor Sport Limited | London | 2019 |
| A Murder of Crowes Ltd | Newton Abbot | 2013 |
| A N Fitness Limited | Milton Keynes | 2012 |
| A N Management Limited | Cradley Heath | 1997 |
| A Need 4 Speed Limited | Witney | 2006 |
| A New Miller Limited | Glasgow | 2007 |
| A New Plane Limited | Richmond | 2022 |
| A New YOU Ltd | Stratford-Upon-Avon | 2025 |
| A Nice Cuppa TV Ltd | London | 2026 |
| A North Coast Local Ltd | Belfast | 2017 |
| A Obolenskaya Limited | Rickmansworth | 2021 |
| A Oliphant Ltd | Innerleithen | 2022 |
| A P K Promotions Limited | Chorley | 2011 |
| A P Tech Ltd | Thetford | 2024 |
| A Phew Services Ltd | Port Sunlight | 2021 |
| A Phocou Art Limited | Manchester | 2023 |
| A Place for US Productions Ltd | Liverpool | 2025 |
| A Place to Escape Ltd | Redcar | 2024 |
| A Place to Potter Ltd | Bury | 2016 |
| A Play, a PIE and a Pint Ltd | | 2004 |
| A Plus Fit Ltd | London | 2020 |
| A Ponder Ltd | Brentford | 2023 |
| A Puddle of Otters Touring Ltd | Pudsey | 2025 |
| A Purple Vision Limited | Leigh-On-Sea | 2000 |
| A Quest for Home Ltd | London | 2025 |
| A Quick Release (Holidays) Limited | Preston | 2003 |
| A Quiet Word | | 1997 |
| A R Entertainments Limited | Stokesley | 2007 |
| A R Models & Props Ltd | High Wycombe | 2018 |
| A R Personal Training Limited | Kingsbridge | 2024 |
| A R Thorn Enterprises Limited | Crowthorne | 2016 |
| A Rahe Limited | London | 2008 |
| A Raving Community Ltd | Isleworth | 2026 |
| A Relaxed Company Ltd | Kingsbridge | 2022 |
| A Ritchie Production Limited | | 2003 |
| A Ritz Thing Ltd | Guildford | 2020 |
| A Room of My Own Ltd | Lancaster | 2019 |
| A Rose by ANY Other Name Ltd | Liverpool | 2021 |
| A Ross Limited | Malton | 2002 |
| A S Athletics Limited | London | 2017 |
| A S Football Academy Limited | Waterlooville | 2015 |