| Aquadigital.Ai Limited | Preston | 2025 |
| Aquadose Limited | Caldicot | 2016 |
| Aquadulce Ltd | Weybridge | 2018 |
| Aquae Sulis (Research) Limited | Bradford-On-Avon | 2004 |
| Aquae Sulis Clinical Research Ltd | Bradford On Avon | 2012 |
| Aquae Sulis Digital Limited | Bath | 2025 |
| Aquaesea Limited | Aylesbury | 2016 |
| Aquaffirm Limited | Richmond | 2014 |
| Aquafide Engineering Limited | London | 2006 |
| Aquafinity Limited | Thornbury | 2012 |
| Aquafleet Limited | London | 2002 |
| Aquaflow Consultancy Limited | London | 2024 |
| Aquaflow Drainage Services Limited | Chorley | 2003 |
| Aquaflow DS (Holdings) Limited | Chorley | 2018 |
| Aquafly Business Services Ltd | Bishop'S Stortford | 2015 |
| Aquaforce Group Ltd. | London | 1997 |
| Aquaforce Rigging & Lifting Services Limited | Middlesbrough | 2020 |
| Aquaforge Consulting Limited | Chichester | 2026 |
| Aquafront Ltd | Birmingham | 2010 |
| Aquafuel Renewables Limited | Ashford | 2008 |
| Aquafuel Research Limited | Ashford | 2001 |
| Aquafuel Tallow Technologies Limited | Ashford | 2011 |
| Aquagas (NW) Limited | Poulton-Le-Fylde | 2020 |
| Aquaguard Water Compliance Ltd | Sale | 2026 |
| Aquagy Limited | West Byfleet | 2015 |
| Aquahope Ltd | London | 2025 |
| Aquaicity Ltd | London | 2024 |
| Aquaintz Consulting Ltd | Kenley | 2022 |
| Aquainvest Acquisitions Limited | Walsall | 2004 |
| Aquainvest Holding Company Limited | Walsall | 2004 |
| Aquainvest Ventures Limited | Walsall | 2004 |
| Aquaiot Ltd | Waterlooville | 2025 |
| Aqualand Holdings Limited | Houghley Lane, Bramley, Leeds | 2002 |
| Aqualand Property Limited | London | 1994 |
| Aqualawn Ltd | Mansfield | 2016 |
| Aqualec Engineering Ltd | London | 2025 |
| Aqualegion Limited | London | 1997 |
| Aqualiance Ltd | Glasgow | 2017 |
| Aqualife Baths Limited | | 1994 |
| Aqualife Products Limited | London | 1999 |
| Aqualiner Limited | Loughborough | 2007 |
| Aqualink Consultancy Limited | Prescot | 2015 |
| Aqualis Systems Ltd | Edinburgh | 2025 |
| Aqualithium Ltd | Leeds | 2019 |
| Aqualogic (WC) Ltd | Liverpool | 2004 |
| Aqualogic Consulting Limited | Bristol | 2014 |
| Aqualogic Limited | Guildford | 2002 |
| Aqualogical Limited | Hamilton | 2025 |
| Aqualook Limited | London | 2011 |
| Aqualore Limited | London | 2025 |
| Aqualung Carbon Capture UK Limited | London | 2021 |
| Aqualux Limited | Tyseley | 1946 |
| Aqualytica Limited | Torquay | 2025 |
| Aquama & Renewables Ltd. | Harrow | 2004 |
| Aquamar Limited | South Shields | 2024 |
| Aquamarine Asset Management Ltd | Worcester | 2023 |
| Aquamarine Consultancy Limited | Bristol | 2017 |
| Aquamarine Consulting Limited | Kington | 2023 |
| Aquamarine Energy Limited | Halesowen | 2004 |
| Aquamarine Investments Limited | Gloucestershire | 1989 |
| Aquamarine Marketing Limited | Harpenden | 2011 |
| Aquamarine Media Ltd | Teignmouth | 2015 |
| Aquamast Limited | London | 2015 |
| Aquamatrix Automation Limited | Stirling | 2026 |
| Aquameadows Ltd | Nottingham | 2022 |
| Aquamonitrix UK Limited | Long Bennington | 2021 |
| Aquamoor Limited | Edinburgh | 2015 |
| Aquamorphic Limited | Gillingham | 2008 |
| Aquanaut Consulting Ltd | Hove | 2021 |
| Aquanautia Limited | Norwich | 2018 |
| Aquanav Ltd | Newcastle Upon Tyne | 2020 |
| Aquaneo Environmental Limited | East Peckham | 2024 |
| Aquaneo Limited | Tonbridge | 2020 |
| Aquanet International Limited | Basingstoke | 1992 |
| Aquanet Power UK Limited | Edinburgh | 2017 |
| Aquanet Trading Ltd | Uxbridge | 2022 |
| Aquania Consultancy Limited | Stevenage | 2014 |
| Aquanota Limited | London | 2005 |
| Aquantis Ltd | Hexham | 2009 |
| Aquapak IP Holdings Ltd | Kings Norton | 2022 |
| Aquapak IP Ltd | Kings Norton | 2022 |
| Aquapea Ltd | Newcastle Upon Tyne | 2020 |
| Aquaped Limited | Cardiff | 2010 |
| Aquaphocus Limited | Reading | 2016 |
| Aquaplus Limited | Godalming | 2015 |
| Aquaponics LAB Ltd | Todmorden | 2014 |
| Aquapress Dispense Limited | Chester | 2024 |
| Aquapulse Intelligence Limited | Orpington | 2025 |
| Aquapura Ltd | Christchurch | 2022 |
| Aquaq Clinical Limited | Belfast | 2014 |
| Aquar Consultancy Ltd | Sutton Coldfield | 2021 |
| Aquare Ltd | London | 2017 |
| Aquaread Limited | London | 2008 |
| Aquarealm Limited | London | 2009 |
| Aquareem Yachting Ltd | London | 2023 |
| Aquarian Broadcast Group Limited | Croydon | 2012 |
| Aquarian EST Limited | Clevedon | 2024 |
| Aquarite Limited | Worcestershire | 2003 |
| Aquarium Design Centre Limited | Finchley | 1991 |
| Aquarium Services Cambs Limited | Peterborough | 2014 |