| Applecross Sports and Wellbeing CIC | Applecross | 2025 |
| Applelandkidz Limited | London | 2025 |
| Apples and Pears Marketing Limited | Nottingham | 1999 |
| Apples and Snakes | London | 1986 |
| Appleseed Arts | Gosport | 2016 |
| Appleton Rifle Club Limited | Warrington | 1964 |
| Appletons Funfairs Ltd | Rugby | 2026 |
| Appletons Leisure Ltd | Rugby | 2025 |
| Appley Bridge Gymnastics Club Ltd | Chorley | 2026 |
| Applied Artists and Makers Co Ltd. | Swansea | 2001 |
| Applied Arts Limited | Goffs Oak | 2015 |
| Applied Fitness Limited | Rochdale | 2023 |
| Applied Martial Arts Academy Ltd | Derby | 2021 |
| Applied Practice Ltd | Borehamwood | 2026 |
| Applied Prose Limited | Blandford Forum | 2025 |
| Applied Scripted ARC Ltd | Droitwich | 2025 |
| Applied Visual Systems Limited | London | 2025 |
| Applify Limited | Dartford | 2013 |
| Apprian Ltd | Preston | 2025 |
| Approach Golf Limited | Epping | 2002 |
| Approaching Fish Productions Ltd | London | 1996 |
| Approtein Limited | Castell-Nedd | 2026 |
| Appsolute Productions Limited | Harrow | 2021 |
| APR Studios Limited | Walsall | 2025 |
| Apres London Ltd | London | 2024 |
| Apres Polo Limited | Egham | 2007 |
| Apricity Theatre Ltd | Westbury | 2020 |
| Apricot Leisure Limited | Tankersley | 1996 |
| Apricus LDN Ltd | Bexley | 2024 |
| April & Gemma Ltd | London | 2023 |
| April Blossoms Ltd | Teddington | 2009 |
| April Companions Ltd | London | 2026 |
| April Media Limited | Guilden Morden | 2005 |
| April Seven Music Ltd | London | 2014 |
| April to July Ltd | London | 2020 |
| April's Street Feet CIC | Clydebank | 2019 |
| Aprilhunterboxing Ltd | Knutsford | 2022 |
| Aprés Music Limited | Liverpool | 2020 |
| APS Fitness Limited | Rickmansworth | 2011 |
| APS Global Holdings Limited | Woodford Green | 2024 |
| APS Pools Ltd | Glastonbury | 2026 |
| APS159 Limited | Oldham | 2021 |
| Apsara Arts | Croydon | 2004 |
| APT 10 Entertainment Ltd | Abingdon | 2021 |
| APT Creations Limited | Wheathampstead | 2012 |
| APT Entertainment Limited | London | 2013 |
| APT Theatre Ltd. | Birmingham | 2026 |
| Aptd International Ltd | London | 2010 |
| Apte Basketball Ltd | London | 2025 |
| Apti Taekwondo Limited | Banbury | 2009 |
| Aptitude Health & Fitness Ltd | Chester | 2020 |
| Aptitude Personal Training Limited | Congleton | 2017 |
| Apton Dance Studio (Essex) Limited | Bishop'S Stortford | 2011 |
| Apus Productions Limited | Hessle | 2014 |
| APV Consultancy Ltd | Chorleywood | 2024 |
| APV Leisure Limited | Leeds | 1992 |
| Apvox Events Limited | Preston | 2024 |
| APW Collective Group Ltd | Pudsey | 2026 |
| APW Productions Ltd | Cardiff | 2022 |
| APX Global Ltd | London | 2024 |
| APX Treatments Limited | Altrincham | 2017 |
| APY Productions Ltd | Norwich | 2014 |
| Aqib Fiaz Boxing Ltd | Manchester | 2024 |
| Aqofficial Limited | Luton | 2022 |
| Aqua Academy GB Ltd | Southsea | 2005 |
| Aqua Academy Ltd | Swansea | 2002 |
| Aqua Action Ltd | Waltham Abbey | 2019 |
| Aqua Beans Ltd | Stratford-Upon-Avon | 2016 |
| Aqua Descaling Co. Limited | Wolverhampton | 1982 |
| Aqua Dogs Bury Ltd | Bury | 2015 |
| Aqua Equestrian Ltd | Harrow | 2021 |
| Aqua Fit Pro Limited | London | 2013 |
| Aqua Fit Senior Ltd | Burnham-On-Crouch | 2019 |
| Aqua Inspire Ltd | London | 2018 |
| Aqua Kids Swim School Limited | Bradford | 2021 |
| Aqua Parcs Limited | Northampton | 2017 |
| Aqua Parcs MK Limited | Milton Keynes | 2025 |
| Aqua Parcs Stevenage Limited | Milton Keynes | 2020 |
| Aqua Park Cardiff Limited | Lichfield | 2016 |
| Aqua Park Grafham Limited | Lichfield | 2021 |
| Aqua Park Lakeside Limited | Lichfield | 2019 |
| Aqua Park Rutland Limited | Lichfield | 2016 |
| Aqua Parks Group Limited | Lichfield | 2016 |
| Aqua Passport Limited | Swansea | 2013 |
| Aqua Physical Limited | Portland | 2014 |
| Aqua Pool & Sauna Limited | Northallerton | 2025 |
| Aqua Rangers Weybridge Ltd | Chertsey | 2013 |
| Aqua Rhythm Limited | Derby | 2017 |
| Aqua Savage Designs Ltd | Bristol | 2017 |
| Aqua Spin Southwest Ltd | Exmouth | 2018 |
| Aqua Sports Yachting Limited | Bournemouth | 2004 |
| Aqua Stars Swim School Limited | Lincoln | 2018 |
| Aqua Swansea Ltd | Swansea | 2019 |
| Aqua Waterpark Ltd | Waltham Abbey | 2025 |
| Aqua With Ashleigh Limited | Sheffield | 2018 |
| Aqua Yachts International Ltd | Lymington | 2023 |
| Aqua Zone Swim School Ltd | Southend-On-Sea | 2025 |
| Aquabatix Limited | Kent | 2005 |
| Aquabelle Swim School Limited | Wickford | 2016 |
| Aquaberry Swim School Ltd | Brentwood | 2026 |