| Advantica Accountants Ltd | London | 2023 |
| Advantiq Solutions Limited | London | 2014 |
| Advantis Global Group Ltd | Pinner | 2020 |
| Advantis OP EX Limited | Manchester | 2016 |
| Advantis Services Limited | Droitwich | 1999 |
| Advantix Consulting Ltd | Gateshead | 2025 |
| Advantix Licensing Solutions Ltd | London | 2025 |
| Advantix Limited | Northwood | 2002 |
| Advantix Services Ltd | Northwood | 2024 |
| Advantology Limited | East Southampton | 2025 |
| Advantus Consulting Ltd | London | 2025 |
| Advantus Group Limited | Worthing | 2004 |
| Advaskin Limited | Leeds | 2006 |
| Advasol Management Ltd | Ilford | 2003 |
| Advastas Limited | Chislehurst | 2023 |
| Advatech UK Limited | London | 2006 |
| Advayd UK Solutions Ltd | Stanmore | 2024 |
| Advbruk Law Firm Ltd | London | 2026 |
| Advct Group Limited | London | 2022 |
| Advd Ltd | Manchester | 2025 |
| Adve Law Limited | Lampeter | 2012 |
| ADVECTION7 Limited | Nuneaton | 2023 |
| Advectus Consulting Ltd | Lutterworth | 2026 |
| Advectus Marketing Ltd | Glasgow | 2024 |
| Adved Infotech Limited | Orpington | 2023 |
| Adveda Limited | London | 2019 |
| Adveert Limited | Pinner | 2017 |
| Adven Management Ltd | Chislehurst | 2023 |
| Advena Business Services and Sons Ltd. | Hillingdon | 2024 |
| Advena Business Services Ltd. | London | 2012 |
| Advencap UK Limited | London | 2022 |
| Advenia Limited | Biggleswade | 2011 |
| Advenio Ltd | Liverpool | 2024 |
| Advent (Leicester) Limited | Loughborough | 2009 |
| Advent Accountants Ltd | York | 2024 |
| Advent Accounting (Suffolk) Limited | Leiston | 2010 |
| Advent Advocacy Limited | Barnet | 2007 |
| Advent AGE Limited | Orpington | 2008 |
| Advent Asset Management Ltd | Ballymena | 2013 |
| Advent Consulting Limited | Hailsham | 2023 |
| Advent Ductwork Systems Ltd | East Horsley | 1979 |
| Advent Energy Ltd | Ballymena | 2010 |
| Advent Engineering Associates Ltd | London | 2024 |
| Advent Engineering Solutions Ltd | Tonbridge | 2023 |
| Advent Global Ltd | Watford | 2023 |
| Advent Maintenance Services Limited | East Horsley | 1998 |
| Advent Marketing Ltd | London | 2021 |
| Advent Print & Design Ltd | Preston | 2014 |
| Advent RTA Limited | Bootle | 2023 |
| Advent Solutions Ltd | London | 2022 |
| Advent South Estate Ltd. | London | 2015 |
| Advent Technical Ltd | Fareham | 2015 |
| Advent Visual Ltd | Bath | 2023 |
| Advent Wind B Limited | Banbridge | 2023 |
| Adventa Digital Ltd | Amington | 2025 |
| Adventine Associates Ltd | New Malden | 2014 |
| Advention Business Partners (UK) Limited | London | 2006 |
| Advention Business Partners Limited | London | 2001 |
| Advention Consulting Limited | Altrincham | 2023 |
| Adventiq Limited | Cambridge | 2005 |
| Adventis Consulting Partners Limited | London | 2022 |
| Advento Group Ltd | Wirral | 2023 |
| Adventous Global Group Ltd | Dursley | 2025 |
| Adventstar Designs Limited | London | 2024 |
| Adventumtraining Ltd | Kenilworth | 2014 |
| Adventure 1 Ltd | South Shields | 2009 |
| Adventure Bike Store Ltd | Ystradgynlais | 2017 |
| Adventure Business Solutions Scotland Limited | Edinburgh | 2011 |
| Adventure CAP Ltd | London | 2022 |
| Adventure Capital Partners Limited | Cheltenham | 1997 |
| Adventure Capitalists Limited | London | 1999 |
| Adventure Collective Ltd | Carlisle | 2017 |
| Adventure Consultancy Worldwide Ltd | Kidderminster | 2022 |
| Adventure Digital Ltd | Newport | 2018 |
| Adventure Education (UK) Limited | Somerset | 2003 |
| Adventure Engineering Ltd | Ely | 2020 |
| Adventure Finance Investments Limited | Reading | 2011 |
| Adventure Finance Limited | Reading | 2001 |
| Adventure Financial Ltd | London | 2024 |
| Adventure Fit Ltd | Kings Lynn | 2016 |
| Adventure Graphics Limited | Sutton Coldfield | 2009 |
| Adventure Green Ltd | Rossendale | 2025 |
| Adventure LAB Ltd | Beare Green | 2024 |
| Adventure NAC Limited | Keswick | 2024 |
| Adventure NO. 1 Limited | Norwich | 2017 |
| Adventure Paws Ltd | Penarth | 2020 |
| Adventure Playground Limited | Belfast | 2015 |
| Adventure Rails Ltd | York | 2022 |
| Adventure Risk Management Services Ltd | Scarning, Dereham | 2019 |
| Adventure Stories Limited | Bath | 2018 |
| Adventure Uncovered Ltd | Wimbledon | 2016 |
| Adventure Websites Ltd | London | 2021 |
| Adventure.Amore Ltd | Redditch | 2024 |
| Adventurean Ltd | Surrey | 2000 |
| Adventuremapping Ltd | London | 2013 |
| Adventures and Wisdom Limited | Eastbourne | 2023 |
| Adventures Begin Ltd | Altrincham | 2018 |
| Adventures in Adland Limited | Preston | 2024 |
| Adventures in Arizona Ltd | Chichester | 2005 |
| Adventures in Art & Wonder Ltd | London | 2026 |