| Advisory Solutions Ltd | Warrington | 2024 |
| Advisory Studio Ltd | London | 2026 |
| Advisorype Limited | London | 1995 |
| Advisoryx Ltd | London | 2025 |
| Advisoryxpress Ltd | Scarborough | 2025 |
| Advista Solutions Ltd | Gerrards Cross | 2024 |
| Advisu Ltd | Waltham Abbey | 2022 |
| Advisx Ltd | New Malden | 2025 |
| Advita Academy Ltd | Milton Keynes | 2025 |
| Advizar Ltd | Leighton Buzzard | 2024 |
| Advize Ltd | Hitchin | 2025 |
| Advizen Ltd | Brighton | 2025 |
| Advizor Limited | Bideford | 2016 |
| Advizr Ltd | Ashford | 2022 |
| Advnc - Tailored Business Solutions Ltd | Leicester | 2017 |
| Advo Holdings Limited | Maidstone | 2005 |
| Advoc Limited | Exeter | 1991 |
| ADVOC8 Ltd | Grantham | 2018 |
| Advocacy & Capacity Development Association Ltd | Cardiff | 2023 |
| Advocacy Advisory International Limited | London | 2025 |
| Advocacy Agency Ltd | Stoke-On-Trent | 2020 |
| Advocacy Coaching and Solutions Ltd | London | 2018 |
| Advocacy Coaching International Ltd | London | 2021 |
| Advocacy Consultancy Ltd | Kent | 2015 |
| Advocacy Services Limited | Stourbridge | 2004 |
| Advocap UK Ltd | Blackburn | 2025 |
| Advocas Limited | | 2007 |
| Advocasey Advisory Limited | Darwen | 2025 |
| Advocata Ltd | London | 2018 |
| Advocate Accounting & Consultancy Ltd | Dartford | 2022 |
| Advocate Business Services Limited | London | 2011 |
| Advocate Legal Services Limited | Knutsford | 2011 |
| Advocate Lovemore Frank P Ltd | London | 2025 |
| Advocate Marketing Communications Limited | Twickenham | 2019 |
| Advocate Marketing Ltd | Reading | 2015 |
| Advocate Public Affairs (Midlands) Ltd | Birmingham | 2024 |
| Advocate Services Ltd | Nottingham | 2019 |
| Advocate Solutions Ltd | Leeds | 2024 |
| Advocate Training and Consultancy Ltd. | Little Totham Maldon | 1989 |
| Advocate Zylka Ltd | London | 2025 |
| Advocated Ltd | London | 2015 |
| Advocates for Animals | London | 2018 |
| Advocates for International Development | London | 2006 |
| Advocates Global Magazines Limited | London | 2023 |
| Advocates Studio Limited | Kingsbridge | 2019 |
| Advocating Action Ltd | Cardiff | 2016 |
| Advoco (SW) Limited | Weymouth | 2002 |
| Advoco (UK) Holdings Limited | Cheadle | 2011 |
| Advoco Consulting Services Ltd | Cheadle | 2009 |
| Advoco Contractor Umbrella Limited | Weymouth | 2017 |
| Advoco Legal Services Limited | Newcastle Upon Tyne | 2017 |
| Advoco Ltd | Woodford Green | 2008 |
| Advoco Planning Limited | Alresford | 2011 |
| Advocure Ltd | London | 2023 |
| Advogen Ltd | London | 2025 |
| Advokat Consultancy Ltd | Liverpool | 2019 |
| Advokat Urban Olson Limited | Cobham | 2001 |
| Advokatai Ltd | Manchester | 2012 |
| Advokate Communications Ltd | London | 2024 |
| Advolve UK Ltd | Penrith | 2024 |
| Advora Limited | London | 2015 |
| Advotax Limited | London | 2021 |
| Advotox Limited | Harrogate | 2016 |
| Advrt Marketing Limited | Southampton | 2017 |
| Advtech Solution Limited | Stafford | 2016 |
| Advue Technologies Ltd | London | 2026 |
| Advvest Limited | Edgware | 2022 |
| Advx Ltd | Godalming | 2024 |
| Advyan Limited | Watford | 2024 |
| Advyse Limited | Lewes | 2022 |
| ADW Architecture Limited | Saltash | 2015 |
| ADW Associates Ltd | Tadley | 2014 |
| ADW Consultancy Ltd | Kingswinford | 2025 |
| ADW Consultants Limited | Preston | 2017 |
| ADW Developments Limited | Harrow | 2009 |
| ADW Engineering NW Ltd | Colne | 2015 |
| ADW Financial Management Limited | Luton | 2012 |
| ADW Hull Limited | Kingston Upon Hull | 2020 |
| ADW Management & Investment Limited | Birmingham | 2025 |
| ADW Mechanical Site Services Limited | Worksop | 2015 |
| ADW Medical Solutions Limited | Sheffield | 2018 |
| ADW Safety Cloud Limited | Basingstoke | 2016 |
| ADW Solutions Limited | Cheadle Hulme | 2011 |
| ADW Studios Limited | Ipswich | 2024 |
| ADW Technical Solutions Limited | Liversedge | 2017 |
| ADW Technologies Limited | Dewsbury | 2019 |
| ADW Utility Solutions Ltd | Leighton Buzzard | 2025 |
| Adwaa Almarai for Engineering Consulting Ltd | Cardiff | 2025 |
| Adwalker (UK) Limited | Potters Bar | 2004 |
| Adwalkersnationwide.Com Limited | Plymouth | 2015 |
| Adwani Autogas Ltd | Musselburgh | 2021 |
| Adwaviation Ltd | Watford | 2024 |
| Adway Ltd | Luton | 2020 |
| Adweb Digital Limited | Northampton | 2012 |
| Adwell & Greene (Accountants) Limited | London | 2022 |
| Adwell Media Ltd | London | 2014 |
| Adwest Media Ltd | London | 2007 |
| Adwick Advisory Ltd | Wirral | 2022 |
| Adwill Company Limited | Northampton | 2012 |
| Adwise Consulting Ltd | Camberley | 2015 |