| Aquarius 7 Limited | | 2007 |
| Aquarius Accounting Services Ltd | Liphook | 2023 |
| Aquarius Associates Limited | Norwich | 1998 |
| Aquarius Aviation Limited | Frodsham | 2003 |
| Aquarius Commissioning Solutions Ltd | Farnborough | 2020 |
| Aquarius Consultancies Ltd | Twickenham | 2023 |
| Aquarius Consulting Ltd | Liverpool | 2023 |
| Aquarius Creative Scotland Limited | Hamilton | 2020 |
| Aquarius Creative Social Limited | Hamilton | 2022 |
| Aquarius CXO Ltd | Edinburgh | 2025 |
| Aquarius Energy Logistics Ltd | Oban | 2022 |
| Aquarius Engineering (Sussex) Ltd | Worthing | 2021 |
| Aquarius Financial Planning Ltd | Bracknell | 2020 |
| Aquarius Gold Consult Ltd | Manchester | 2017 |
| Aquarius Home Staging Ltd | London | 2019 |
| Aquarius Living Limited | London | 2015 |
| Aquarius Management Solutions Limited | West Malling | 2015 |
| Aquarius Population Health Limited | London | 2011 |
| Aquarius Productions Ltd | Kingston Upon Thames | 2018 |
| Aquarius Project Associates Limited | London | 1995 |
| Aquarius Tax Consultancy Ltd | Blackburn | 2010 |
| Aquarius Technics Limited | London | 2001 |
| Aquarius Technology Services SL Ltd. | Grays | 2010 |
| Aquarius Test Engineering Ltd | Hove | 2024 |
| Aquarius Wealth UK Limited | Clevedon | 2019 |
| Aquark Technologies Limited | Eastleigh | 2020 |
| Aquarose Limited | London | 2016 |
| Aquarrii Capital Limited | Leigh-On-Sea | 2020 |
| Aquas Concepts Limited | Enfield | 2023 |
| Aquasafe Building Services Engineers Limited | Bridgend | 2007 |
| Aquasafe Environmental Limited | Bath | 2015 |
| Aquasam Limited | Dunmow | 2017 |
| Aquasanta Limited | Isleworth | 2019 |
| Aquasave Technologies Limited | Tewkesbury | 2000 |
| Aquaseeka Ltd | Newcastle Upon Tyne | 2020 |
| Aquasentry Environmental Limited | Larkfield | 2010 |
| Aquasions Limited | Borehamwood | 2022 |
| Aquasition (UK) Ltd | Keighley | 2014 |
| Aquaslava Ltd | Mildenhall | 2023 |
| Aquasphere ROV Services Ltd | Litttle Paxton, St Neots | 2011 |
| Aquasphinx Limited | Haywards Heath | 2020 |
| Aquass Secretaries Limited | London | 2015 |
| Aquastat Environmental Services Limited | Loughton | 2011 |
| Aquastat Limited | Crawley | 2017 |
| Aquastrike Limited | London | 2011 |
| Aquasun Group Ltd | London | 2022 |
| Aquasun Group Management Limited | London | 2026 |
| Aquasure Limited | Birstall | 2007 |
| Aquataur Ltd | Bristol | 2007 |
| Aquataurus Ventures Ltd | London | 2021 |
| Aquatax Limited | Stourbridge | 2007 |
| Aquate Consultancy Ltd | Dartford | 2012 |
| Aquateal Solutions Limited | Altrincham | 2024 |
| Aquatech Rubber Limited | Hythe | 1996 |
| Aquatech Survey Limited | Gloucester | 2010 |
| Aquatecture Design Services Limited | Potters Bar | 2021 |
| Aquatek Pipe Services Limited | Hamilton | 2010 |
| Aquaten Limited | Shipston-On-Stour | 2013 |
| Aquateq Pools Ltd | Glasgow | 2012 |
| Aquatera Group Limited | Stromness | 2019 |
| Aquatera Holdings Limited | Aberdeen | 2022 |
| Aquatera Limited | Stromness | 2000 |
| Aquaterra Energy (Holdings) Limited | Norwich | 2015 |
| Aquaterra Ventures Limited | Aberdeen | 2011 |
| Aquaterre Limited | Leicester | 1991 |
| Aquatic Agents Ltd | Dorking | 2021 |
| Aquatic Canine Therapy (South) Ltd | Swanage | 2015 |
| Aquatic Consultancy Ltd | Penryn | 2015 |
| Aquatic Design Limited | Finchley | 1998 |
| Aquatic Engineering & Construction Limited | Banff | 1990 |
| Aquatic Survey and Monitoring Ltd. | Weardale | 2001 |
| Aquatic Vets Ltd | Buchlyvie | 2020 |
| Aquatics Capital Ltd | London | 2017 |
| Aquatitans Ltd | Glasgow | 2022 |
| Aquatonics Limited | Crediton | 2000 |
| Aquatoona Consulting Ltd | London | 2021 |
| Aquatopia Consulting Ltd | Mansfield | 2015 |
| Aquatoria Limited | Brigg | 2019 |
| Aquatrace (U.K.) Limited | Devon | 1999 |
| Aquatread Canine Hydrotherapy Limited | York | 2015 |
| Aquatron Scientific Limited | Glasgow | 2025 |
| Aquatrust Water and Ventilation (Holdings) Ltd | Cleckheaton | 2020 |
| Aquatrust Water and Ventilation Group Limited | Cleckheaton | 2023 |
| Aquatrust Water and Ventilation Limited | Bradford | 2003 |
| Aquatti Engineering Limited | London | 2023 |
| Aquaurum Ltd | Godalming | 2012 |
| Aquause Limited | Newport Pagnell | 2021 |
| Aquavale Limited | Essex | 1998 |
| Aquavation Limited | Broughton-In-Furness | 2024 |
| Aquavera Engineering Ltd | Halesowen | 2025 |
| Aquaview Consulting Ltd | Worthing | 2022 |
| Aquavir Ltd | Swadlincote | 2024 |
| Aquavirtus Ltd | Eastleigh | 2026 |
| Aquavista Limited | Dunmow | 2007 |
| Aquavit Limited | | 1996 |
| Aquavit Translations Limited | London | 2024 |
| Aquavitale Ltd | St. Austell | 2020 |
| Aquaware Systems Limited | Wallingford | 1994 |
| Aqubit Ltd | Nottingham | 2019 |
| Aquen Ltd | Bracknell | 2026 |