| AAC Commercial Ltd | High Wycombe | 2024 |
| AAC Essex Group Holdings Limited | Maldon | 2025 |
| AAC Group Holdings Limited | Tamworth | 2022 |
| Aacc (Clinical) Ltd | Bridgnorth | 2025 |
| Aace Group Limited | Bristol | 2016 |
| Aacn Holdings Ltd | Sutton | 2022 |
| Aaco Holdings Ltd | Wakefield | 2020 |
| Aacr Holdings Limited | Chippenham | 2025 |
| AAD Holdings (East Anglia) Limited | Eye | 2021 |
| Aada Holding Limited | Enfield | 2026 |
| Aadam Umar Limited | Nottingham | 2021 |
| Aadams Holdings Ltd | Walsall | 2022 |
| Aadhi Services Limited | Portsmouth | 2023 |
| Aadroon Holdings Ltd | Luton | 2021 |
| Aadt Limited | Wilmslow | 2025 |
| AAE Homes Limited | Derby | 2022 |
| AAE Investment Limited | London | 2014 |
| AAE Property Group Ltd | London | 2026 |
| AAE Solutions Limited | Glasgow | 2006 |
| Aaee Holdings Limited | Ormskirk | 2024 |
| Aaem UK Holdings Limited | Liverpool | 2024 |
| Aaero Solutions Limited | Keighley | 2018 |
| AAF Holdings Limited | Newcastle | 2018 |
| AAG 1962 Ltd | Glasgow | 2024 |
| AAG Defence Services Ltd | Angmering | 2020 |
| AAG FH UK PLC | Stoke-On-Trent | 2023 |
| AAG Insurance Services Limited | Cambridge | 2016 |
| AAG Mortgage Brokerage Ltd | Solihull | 1997 |
| AAG2 Group Limited | London | 2025 |
| Aagc Limited | Harpenden | 2022 |
| Aags FX Limited | Guildford | 2024 |
| Aagsjp Limited | Solihull | 2003 |
| AAH Capital Holdings Limited | Borehamwood | 2025 |
| AAH River Limited | Haslemere | 2024 |
| AAH UK Holdings Limited | London | 2022 |
| Aahil Investments Limited | Birmingham | 2020 |
| AAI Global Holdings Limited | Cheadle | 2021 |
| AAI Solutions Limited | Bridgnorth | 2012 |
| Aaidan K Ltd | Welling | 2020 |
| Aaion Ltd | Taunton | 2023 |
| Aais Holdings Ltd | Sheffield | 2025 |
| Aaiz Holdings Limited | Lincoln | 2025 |
| AAJ Capital Ltd | Haverfordwest | 2025 |
| AAK Funding Ltd | Milton Keynes | 2022 |
| AAK Services London Ltd | London | 2021 |
| Aakglobalinvestments Limited | New Malden | 2025 |
| AAL Holdings Limited | London | 2026 |
| Aalay Collective Limited | London | 2026 |
| Aalberg, Bauer & Wilson Konsult Ltd. | Congleton | 2020 |
| Aali Capital Group Limited | Forfar | 2024 |
| Aalma Ltd | London | 2026 |
| Aals Holdco Limited | Northallerton | 2026 |
| Aalto Capital Group Limited | London | 2019 |
| Aalto Mortgages Limited | London | 2015 |
| AAM Maas Ltd | Eaton Socon | 2020 |
| AAM Northern Ltd | Stockton-On-Tees | 2025 |
| AAM Services (UK) Limited | Mansfield | 2001 |
| Aamas Investments Ltd | Bushey | 2025 |
| Aamc Ltd | London | 2025 |
| Aameds Pharma Limited | Borehamwood | 2025 |
| Aamerah Holding Ltd | Sheffield | 2025 |
| Aaml Holdings Limited | London | 2022 |
| Aamsid International (UK) Limited | Ruislip, | 2025 |
| Aamya Limited | Leeds | 2025 |
| Aanco 2025 Limited | Billingham | 2025 |
| Aanco Group Limited | Billingham | 2021 |
| Aanco Holdings Limited | Billingham | 2020 |
| Aandk (BHH) Limited | Haverhill | 2013 |
| Aanika Finance Limited | Harrow | 2022 |
| Aanika Holdings Limited | Harrow | 2023 |
| AAO Medical Consultancy Limited | London | 2021 |
| Aaoo 254 44 1 Limited | London | 2023 |
| AAP Capital Ltd | Glasgow | 2023 |
| AAP Chemicals Limited | Lewes | 2014 |
| AAP Electrical Group Limited | Milnrow | 2017 |
| AAP Introductions Limited | Edenbridge | 2026 |
| Aapka Limited | Solihull | 2021 |
| Aapmc Holdings Limited | Manchester | 2020 |
| Aaps Holdings Ltd | Droitwich | 2025 |
| AAR Assured Investment Limited | Ilford | 2024 |
| AAR Gower Holdings Limited | Swansea | 2022 |
| AAR TEE Ferretti International Holdings Ltd | Leamington Spa | 2018 |
| AAR TEE Industries Holdings UK Ltd | Leamington Spa | 2018 |
| Aarana Capital Limited | London | 2026 |
| Aarav Investment and Accounts Limited | London | 2022 |
| Aarc Assets Ltd | Northwood | 2026 |
| Aarc Associates Ltd | Bishop'S Stortford | 2013 |
| Aarc Capital Limited | Watford | 2016 |
| Aarc Holdings Ltd | Wimborne | 2023 |
| Aarc Ventures Limited | Wilmslow | 2023 |
| Aardee Real Estate Enterprises Limited | Watford | 2018 |
| Aardent Group Holdings Ltd | Bedford | 2021 |
| Aardman Holdings Limited | | 1991 |
| Aardvark Bidco Limited | London | 2021 |
| Aardvark Design Group Limited | Droitwich | 2015 |
| Aardvark FX Holdings Ltd | Keynsham | 2026 |
| Aardvark Group Limited | Rochester | 2018 |
| Aardvark Holdings Limited | Rotherham | 2022 |
| Aardvark Limited | Bexhill-On-Sea | 2015 |
| Aardvark Midco 1 Limited | London | 2021 |