| Aqua Taps Limited | London | 2022 |
| Aqua Technics Pools UK Limited | Ashford | 2025 |
| Aqua Terra Marine Limited | Worcester | 2013 |
| Aqua Utilities & Water Limited | Skelmersdale | 2012 |
| Aqua Vivendi Limited | London | 2013 |
| Aqua X Limited | London | 2017 |
| Aqua-Bell Limited | Norwich | 1971 |
| Aqua-Dial Limited | High Wycombe | 1982 |
| Aqua-Marine International Limited | Southampton | 2004 |
| Aqua-Sol Products Ltd | Horsham | 2012 |
| Aquadigitechs Ltd | London | 2025 |
| Aquadrape Limited | Salford | 2004 |
| Aquae Sulis Renatus Limited | Bradford-On-Avon | 2014 |
| Aquafend Limited | Salisbury | 2014 |
| Aquaflame Systems Limited | Walsall | 2021 |
| Aquaflow Limited | Crewe | 2006 |
| Aquagem Investments UK Ltd | Grays | 2022 |
| Aquahealth Limited | Tanfield Lea | 2000 |
| Aquaid (UK) Ltd | Cambridge | 2005 |
| Aquajoy Limited | East Grinstead | 2010 |
| Aqualarm Limited | Rayleigh | 1988 |
| Aqualetes Ltd | Calne | 2013 |
| Aquality Ltd | Rochester | 2014 |
| Aqualogis Europe Ltd | Bexleyheath | 2015 |
| Aqualuce Limited | London | 2024 |
| Aqualution Systems Asset Management Limited | Alnwick | 2015 |
| Aquamarine Systems Limited | Leeds | 1999 |
| Aquaoak Limited | Egham | 2014 |
| Aquaphot Limited | Maldon | 1989 |
| Aquaplane Limited | Malvern | 2021 |
| Aquarius Cosmetic UK Ltd | London | 2025 |
| Aquarius Offshore Ltd | Aberdeen | 2021 |
| Aquarius Project Marine Solutions Ltd | Aberdeen | 2021 |
| Aquarius Yachting Limited | London | 2024 |
| Aquasafe Swim School Limited | Bromborough | 2017 |
| Aquascot Trustees Limited | Alness | 2008 |
| Aquascreen Ltd | Watlington | 2011 |
| Aquaserve Contracting Limited | Kettering | 2020 |
| Aquaserve Fish Limited | Kettering | 2020 |
| Aquashop Limited | Doncaster | 2012 |
| Aquaskipper UK Limited | Brackley | 2006 |
| Aquasmith Limited | London | 2014 |
| Aquaspace Ltd. | London | 2016 |
| Aquaspec Solutions Limited | Gillingham | 2025 |
| Aquasportonline Limited | Solihull | 2007 |
| Aquass Black Limited | London | 2015 |
| Aquass Bonds Limited | London | 2017 |
| Aquass Gold Limited | London | 2018 |
| Aquass Green Limited | London | 2014 |
| Aquass Limited | London | 2014 |
| Aquass Red Limited | London | 2014 |
| Aquass Yellow Limited | London | 2014 |
| Aquastay Limited | Aldershot | 2021 |
| Aquasteps Limited | Doncaster | 2012 |
| Aquatec Plumbing & Heating Services Limited | Southampton | 2000 |
| Aquatech Drilling Limited | Insch | 2012 |
| Aquatech Industrial Company Ltd. | London | 2017 |
| Aquatic Adventure Ltd | London | 2020 |
| Aquatic Complex Ltd | Norwich | 2022 |
| Aquatic Fanatics Limited | Halstead | 2017 |
| Aquatice Limited | Worksop | 2000 |
| Aquatreat Limited | Ross-On-Wye | 1983 |
| Aquavein Limited | Dorchester | 2020 |
| Aquaven Ltd | Walsall | 2000 |
| Aquawaste Solutions Limited | Bristol | 2010 |
| Aquaworld Limited | Cradley Heath | 2003 |
| Aquel Projects Limited | Northwich | 2016 |
| Aqueous (Fitted Bathrooms) II Limited | Buckinghamshire | 1999 |
| Aquila 1516 Limited | Chelmsford | 2009 |
| Aquila BTE 1 Limited | Chelmsford | 2007 |
| Aquila Chelmsford Limited | Chelmsford | 2001 |
| Aquila Ipswich Limited | Chelmsford | 2018 |
| Aquila Maldon Limited | Chelmsford | 2007 |
| Aquila Open Space Limited | Chelmsford | 2006 |
| Aquila Property (London) Limited | Ramsgate | 2009 |
| Aquila Property Search Limited | Ramsgate | 2009 |
| Aquilus Limited | London | 2007 |
| Aquivar Management Services Limited | Cambridge | 1983 |
| Aqula Ltd | Dudley | 2008 |
| Aqusof Gleam Limited | Welling | 2023 |
| Aqutran I.T. Limited | London | 2014 |
| Aqzid Property Ltd | Preston | 2024 |
| AR & KA Ltd | Harrow | 2024 |
| AR & PA Transport Limited | Norwich | 2014 |
| AR Accountancy Limited | Crossford | 2015 |
| AR Audit Services Limited | London, | 2015 |
| AR Design Consultancy Limited | Nottingham | 2010 |
| AR Diecast Models Limited | Ross-Shire | 2005 |
| AR Friends Limited | Woking | 2023 |
| AR Mining Ltd | Wakefield | 2021 |
| AR Panesar Limited | London | 2015 |
| AR Pharmaceuticals 01 Ltd | Glasgow | 2025 |
| AR Pharmaceuticals 02 Ltd | Glasgow | 2025 |
| AR Pharmaceuticals 03 Ltd | Glasgow | 2025 |
| AR Venz Componentes Industriales Ltd | Windsor | 2010 |
| Ar-Dor Beauty Limited | Belfast | 2011 |
| Ar-Pack Limited | London | 1951 |
| AR1EL Limited | Harrogate | 2020 |
| ARA Property Development Limited | Derby | 2012 |
| Arab Line Limited | London | 2013 |