| API Leading Ltd | Beckenham | 2007 |
| API Marketing Services Limited | London | 2019 |
| API North Cornwall Investments Limited | London | 2024 |
| API Oliver Investments Limited | London | 2025 |
| API Securities Limited | London | 2025 |
| API Tablet Press Ltd | Dagenham | 2018 |
| Apiary Botanicals Limited | Abingdon | 2026 |
| Apical Enterprises Ltd | Leatherhead | 2016 |
| Apice Limited | London | 2005 |
| Apidae Workforce Consulting Ltd | Cwmbran | 2021 |
| Apiezon Products Limited | Salford | 1933 |
| Apip Nominee 1 Limited | Riding Mill | 2012 |
| Apip Nominee 2 Limited | Riding Mill | 2012 |
| Apis Mellifera Cosmetics Limited | Abingdon | 2025 |
| Apisense Ltd | Colchester | 2022 |
| APK Mortgages Ltd | London | 2020 |
| APL Consortium Limited | Bristol | 2015 |
| APL Subco Limited | Lymm | 2025 |
| Apl.Me Limited | Morecambe | 2007 |
| Aplasco Industry Co., Ltd | Kenilworth | 2017 |
| Aplasco Industry Group Co., Ltd | Beckenham | 2021 |
| Aplegen Co., Ltd | Beckenham | 2024 |
| Aplr Law Office Limited | London | 2024 |
| Aplusv Group Holdings Limited | West Midlands | 2014 |
| APM A1 Limited | Oswestry | 2023 |
| APM Human Resources Limited | Leicester | 2018 |
| Apmg-Australasia Limited | Buckinghamshire | 2007 |
| Apmg-International Limited | High Wycombe | 2012 |
| Apmg-Uk Limited | High Wycombe | 2007 |
| Apml Investments Limited | London | 2019 |
| Apmmedia Ltd | Cardiff | 2016 |
| Apna Builders London Ltd | London | 2020 |
| Apna Kulcha Ltd | Slough | 2019 |
| Apna Punjab Ltd | Slough | 2019 |
| APO Tool International Ltd. | London | 2009 |
| Apokotia Ltd | London | 2026 |
| Apollo Beijing Services Co. Limited | Cardiff | 2008 |
| Apollo Dental Interiors Limited | Baldock | 2015 |
| Apollo Exchange Ltd | Stoke-On-Trent | 2020 |
| Apollo Finance Ltd. | Retford | 2016 |
| Apollo Holdings Limited | Baldock | 2015 |
| Apollo Mental Health and Well-Being CIC | Fleet | 2024 |
| Apollo Sealants Contracting Limited | Chorley | 2012 |
| Apollo Steels Limited | Mitcham | 1872 |
| Apollo Taxis Wrexham Limited | Wrexham | 2016 |
| Apollo Teaching Services (ENG) Ltd | Aberkenfig | 2018 |
| Apollo Windows Ltd | Maidstone | 2012 |
| Apopote Ltd | London | 2022 |
| Aport Ltd | Adlington | 2016 |
| Apostle Clothing Limited | Birmingham | 2019 |
| Apotekergata 2 Limited | London | 2023 |
| Apotheca Limited | Swansea | 2001 |
| App Sweden Limited | London | 2025 |
| App-Chem Limited | Amesbury | 1981 |
| Appappit Ltd | Camberley | 2015 |
| Apparel Campaign Ltd | London | 2024 |
| Apparel Source Ltd | London | 2014 |
| Appartment Living Ltd | Welling | 2023 |
| Appdrome Ltd | Solihull | 2015 |
| Appelboom Ltd | Manchester | 2021 |
| Appian-Wilson Limited | Bangor | 1963 |
| Appiculate Ltd | London | 2022 |
| Appintegro Ltd | Southampton | 2023 |
| Apple Acoustics Limited | Manchester | 2025 |
| Apple Barn Services Limited | Kent | 2002 |
| Apple Cleaning & Support Services Limited | Westbury | 2017 |
| Apple Homes Limited | Camberley | 2004 |
| Apple Nails and Beauty Ltd | London | 2016 |
| Apple Office Solutions (UK) Limited | Alcester | 2011 |
| Apple Press Limited | London | 1984 |
| Apple Print and Creative Limited | Newbury | 2013 |
| Apple Rabbit (UK) Co., Ltd | Manchester | 2020 |
| Apple Repair Centre Limited | Leominster | 2015 |
| Apple Rochester Gears Limited | Northamptonshire | 1984 |
| Apple Tree Nursery Schools Limited | Brighton | 2026 |
| Apple.Com Ltd | Middlesex | 2000 |
| Applebeegreen Ltd | Carterton | 2015 |
| Applebridge Limited | Middlesbrough | 2025 |
| Appleby Law Limited | Manchester | 2021 |
| Appleby Riverside Property Limited | Penrith | 2011 |
| Appleby, Byrne and Rosenstein Limited | London | 2020 |
| Applecheck Services Limited | Westcliff-On-Sea | 2012 |
| Applecurrant Limited | Ramsbottom | 2015 |
| Applegarth 1965 Limited | Newton Abbot | 2014 |
| Applegate Limited | Spalding | 2013 |
| Applegrove Highland Ltd | Dingwall | 2022 |
| Applehayes Rise Management Limited | Bristol | 2009 |
| Appleleaf Limited | Grimsby | 2019 |
| Applepiesport Ltd | Darwen | 2012 |
| Appleton Signs Unlimited | Eastleigh | 1979 |
| Appletree (Kent) Limited | Maidstone | 2018 |
| Appletree Court Care Limited | London | 2005 |
| Appletree Fabrics Limited | Lisburn | 1995 |
| Appletree Practice Ltd | York | 2007 |
| Appletree Strategic Land Ltd | Stratford-Upon-Avon | 2026 |
| Applewood 1960 Limited | Southampton | 2013 |
| Appleyard Consulting Limited | London | 2023 |
| Appleyards Limited | London | 2000 |
| Appliance Force Limited | Leigh-On-Sea | 2000 |
| Appliances 4 Less Limited | Ilford | 2014 |