| Aptus Financial Ltd | Luton | 2015 |
| Aptus Group Limited | Bolton | 2012 |
| Aptus Wealth Limited | Horsham | 2012 |
| Aptyk Limited | Swindon | 2011 |
| Apudos Ltd | Borehamwood | 2019 |
| Apuk Capital Ltd | Manchester | 2025 |
| Apulia Limited | Hermitage Lane Maidstone | 2001 |
| Apunno Holding Ltd | Iver | 2025 |
| Apus Holdings Limited | Buckingham | 2025 |
| APW Film II, Ltd. | London | 2017 |
| APW Financial Planning Limited | Lancs | 2016 |
| APW Futures Limited | Eastbourne | 2020 |
| APW Group Ltd | Stevenage | 2025 |
| APW UK Arcco Limited | Lichfield | 2021 |
| APW UK Tower Holdings Limited | Lichfield | 2021 |
| APW Whelton Ltd | Stockport | 2014 |
| APX Holdings Ltd | Cardiff | 2025 |
| APX Market Trading Limited | Hebburn | 2025 |
| Apx-One Group Ltd | Atherton | 2025 |
| APX8 Ltd | London | 2025 |
| APZ London Properties Ltd | London | 2022 |
| AQ Amorgos Holdings Limited | London | 2021 |
| AQ Asset Management Ltd | Middx, Southall | 2024 |
| AQ Crossover Holdings Ltd | London | 2022 |
| AQ Finance Ltd | Manchester | 2018 |
| AQ Focus Limited | Bury Saint Edmunds | 2026 |
| AQ Heraclius Holdings Limited | London | 2020 |
| AQ Holding Ltd | Leeds | 2024 |
| AQ Holdings Group Ltd | Rotherham | 2026 |
| AQ INS Ltd | Bradford | 2014 |
| AQ Pulpo Holdings Limited | London | 2024 |
| AQ Sphere Holdings Limited | London | 2021 |
| AQ Sphere Midco Limited | London | 2021 |
| AQ1440 Ltd | London | 2021 |
| AQ1443 Ltd | London | 2022 |
| AQA Commercial Services Limited | Manchester | 2022 |
| AQA Global Limited | London | 2025 |
| AQA Group Ltd | Manchester | 2023 |
| AQA Head Office Ltd | Manchester | 2026 |
| AQA Holdings Ltd | Leeds | 2024 |
| Aqah Properties Limited | Birmingham | 2017 |
| Aqal Ltd | London | 2019 |
| AQC Group Holdings Ltd | Leigh-On-Sea | 2025 |
| Aqeeli Holding Limited | Morden | 2024 |
| Aqfx Trading Ltd | London | 2025 |
| Aqgas Group Ltd | Netherfield | 2023 |
| AQL (Financial) Limited | Leeds | 2013 |
| AQL Holdings Limited | Leeds | 2017 |
| Aqlq Holdings Ltd | Derby | 2026 |
| AQM Innovation Group Ltd | London | 2025 |
| Aqorn Ltd | London | 2024 |
| AQR Capital Management (UK Services II) Limited | London | 2020 |
| AQR Capital Management (UK Services) Limited | London | 2011 |
| AQS Midco Limited | Reading | 2021 |
| AQS Pbsa Holding (UK) Limited | Reading | 2021 |
| AQS Topco Limited | Reading | 2021 |
| Aqua Arrow Limited | London | 2016 |
| Aqua Associates Limited | Chester | 2019 |
| Aqua Brands Distribution Holdings Limited | Leicestershire | 2022 |
| Aqua Cars (Holdings) Limited | Titchfield | 2017 |
| Aqua Comms (UK) Limited | London | 2019 |
| Aqua Distrib Ltd | London | 2025 |
| Aqua Flux Technology Ltd | Guildford | 2025 |
| Aqua Global Solutions Holdings Limited | Wallington | 2026 |
| Aqua Group Holdings Ltd | Cambridge, | 2021 |
| Aqua Holdco Limited | London | 2025 |
| Aqua London Limited | London | 2022 |
| Aqua Midco Limited | London | 2025 |
| Aqua Navis Ltd | Hereford | 2018 |
| Aqua Operations Holding Limited | Bingley | 2022 |
| Aqua Platani Holdings Limited | Enfield | 2022 |
| Aqua Platinum Holdings Ltd | Fareham | 2024 |
| Aqua Pond Solutions Ltd | London | 2016 |
| Aqua Poseidon Limited | London | 2025 |
| Aqua Rush Limited | Fareham | 2023 |
| Aqua Sulis Financial Management Limited | Winchester | 2017 |
| Aqua Topco Limited | London | 2024 |
| Aqua Veritas Ltd | London | 2025 |
| Aqua Vita Capital Ltd | Sheffield | 2023 |
| Aqua Vitae PTD Ltd | London | 2025 |
| Aqua Wealth Management Limited | Hoddesdon | 2012 |
| Aquacheck Group Holdings Limited | Blackburn | 2026 |
| Aquadrome Holdings Limited | Leicester | 2023 |
| Aquae Sulis Lending Limited | Ipswich | 2022 |
| Aquagas Solutions Ltd | Caerphilly | 2025 |
| Aquagem Holdings Ltd | Stafford | 2022 |
| Aquagen Holdings Ltd | Stirling | 2017 |
| Aquagold Limited | London | 2001 |
| Aquahydra Technologies Ltd | Derby | 2021 |
| Aqualibre Digital Carbon Ltd | London | 2022 |
| Aqualibre Holdings Ltd | London | 2022 |
| Aqualight Holdings Limited | Northampton | 2019 |
| Aqualisa Finance Ltd | Kent | 2004 |
| Aqualisa Group Ltd | Kent | 2004 |
| Aqualisa Holdings (International) Limited | Westerham | 2015 |
| Aqualisa Holdings Limited | Westerham | 2012 |
| Aqualona Products USA Ltd | Potters Bar | 2024 |
| Aqualyft Ltd | Crawley | 2025 |
| Aquamain Group Limited | London | 2018 |
| Aquamain Holdings Limited | London | 2018 |