| A & T Aqua Treadmill Limited | Sittingbourne | 2025 |
| A & T Golf Limited | Ross-On-Wye | 2017 |
| A 2 Z Adventures Ltd | Weymouth | 2015 |
| A 2 Z Physio Ltd | Dundee | 2012 |
| A a Martial Arts Limited | Warwickshire | 2006 |
| A Ackers IR Limited | Wigan | 2024 |
| A Adkins Touring Limited | London | 2008 |
| A and J Lifestyle Ltd | Minehead | 2024 |
| A and K Entertainment Group Ltd | Bexhill On Sea | 2026 |
| A and M Fitness Limited | Bristol | 2015 |
| A Attractions Limited | Richmond | 2023 |
| A B Agencies Ltd | Bolton | 2013 |
| A B Backline Limited | Hampton | 2008 |
| A B BET Ltd | Widnes | 2005 |
| A B C Gymnastics & Dance CIC | Wigan | 2011 |
| A B Health & Wellbeing Limited | Chesterfield | 2026 |
| A B Merchandising Limited | Watford | 2021 |
| A B SKI Limited | Reading | 2003 |
| A B Strength Ltd | Hornchurch | 2022 |
| A B Willoughby Ltd | London | 2021 |
| A Badge of Friendship Limited | Barnsley | 2009 |
| A Better Feeling Limited | London | 2018 |
| A Better Place Fitness Limited | Swindon | 2025 |
| A Better Whey Ltd | Glasgow | 2023 |
| A Bigger Conversation Limited | Rainhill | 2024 |
| A BIT of Sparkle Ltd | Bournemouth | 2019 |
| A Blank Canvas CIC | Hull | 2026 |
| A Blaze of Feather Limited | St Ives | 2023 |
| A Book of Portraits C.I.C. | Birmingham | 2025 |
| A Bowl of Tiramisu Ltd | Swansea | 2025 |
| A Brady Picture Ltd | Ipswich | 2025 |
| A Brighter Headache Limited | Aylesford | 2016 |
| A Brightmore Racing Ltd | Buxton | 2025 |
| A Brown Girl Recommends Limited | London | 2024 |
| A Bunch of Jessies Ltd | Bellshill | 2025 |
| A C Coaching & Sports Development Limited | Wolverhampton | 2008 |
| A C D Properties Limited | | 1997 |
| A C Eventing Ltd | Middle Barton | 2017 |
| A C F Sports Promotions Limited | Aberdeen | 1983 |
| A C Tennis Ltd | Solihull | 2025 |
| A Case for Books Limited | Wolverhampton | 2020 |
| A Cash Limited | Billericay | 2017 |
| A Cat Called Rover Ltd | London | 2014 |
| A Class Sessions Limited | London | 2024 |
| A Codling Ltd | Fivemiletown | 2024 |
| A Collective MCR CIC | Salford | 2025 |
| A Competition Company Ltd | Loughborough | 2026 |
| A Crafty Community Ltd | Liverpool | 2026 |
| A Crew Nutrition, Coaching & Management Services Ltd | Dundee | 2025 |
| A Culture of Sports C.I.C. | London | 2024 |
| A Curious Invitation Limited | London | 2025 |
| A Cuthbert & Co Limited | Cardiff | 2012 |
| A Cycling Ltd | Llangadog | 2015 |
| A D Elkins Ltd | Waltham Cross | 2023 |
| A D Entertaining Limited | Stoke-On-Trent | 2022 |
| A D Golf Management Limited | Leeds | 2004 |
| A Dad's Life Ltd | South Queensferry | 2025 |
| A Day on the Farm Ltd | Frome | 2020 |
| A Day With ... Limited | Eastleigh | 2003 |
| A Different Path Limited | Taunton | 2019 |
| A Digital Designer Ltd | Manchester | 2013 |
| A Donut Stunts Ltd | Leighton Buzzard | 2023 |
| A Dozen Eggs Ltd | Loughborough | 2011 |
| A DUE BUS Limited | Princes Risborough | 2014 |
| A E Brabant Limited | Warwick | 2016 |
| A E Davies Ltd | Preston | 2017 |
| A E Events Ltd | Brecon | 2014 |
| A Ellis Motorsports Ltd | Swindon | 2025 |
| A Entertainment Services Limited | Smethwick | 2026 |
| A Events London Ltd | London | 2017 |
| A F Fitness Studio Ltd | London | 2020 |
| A Farm 2024 Limited | London | 2024 |
| A Fave Five Films Limited | London | 2020 |
| A Festival Limited | Sunningdale | 2018 |
| A Finch UK Ltd | Buckhurst Hill | 2019 |
| A Fine Balance Saffron Walden Limited | Saffron Walden | 2025 |
| A Fitness Limited | Harrogate | 2014 |
| A Fitness SS Ltd | Weybridge | 2021 |
| A Fitter Life Limited | Newport Pagnell | 2011 |
| A FLY on the Wall Ltd | London | 2025 |
| A Fordable Leisure Limited | Loughton | 2010 |
| A French Production Ltd. | Saxmundham | 2007 |
| A Full English Limited | London | 2020 |
| A G Coaching Limited | Hereford | 2003 |
| A Gallery of One's Own Limited | Doncaster | 2021 |
| A GAY and a NON GAY Limited | Reading | 2019 |
| A Ghost in Your EAR Limited | Sittingbourne | 2025 |
| A Gold KG Limited | Hove | 2025 |
| A Goode Sport Ltd | Newport | 2010 |
| A Grade Music Group Limited | Belvedere | 2019 |
| A Graphics Ltd | London | 2021 |
| A Great Night OUT Ltd | Warrington | 2025 |
| A Great Nothing Ltd | Sunderland | 2024 |
| A H Entertainment Engineering Limited | Ely | 2013 |
| A H Music Management Limited | Saffron Walden | 2017 |
| A H SET Decorator Ltd | Borehamwood | 2025 |
| A H Sports Management Ltd | Glasgow | 2026 |
| A Halo Ltd | London | 2025 |
| A Handley IR Limited | Otley | 2021 |
| A Happy Rotho Ltd | London | 2021 |