| Adun Toridas Ltd | Bradford | 2026 |
| Adupresh Resources Ltd | Oldham | 2024 |
| Adur Design Solutions Ltd | Littlehampton | 2016 |
| Adura Limited | London | 2013 |
| Aduray Ltd | Wimborne | 2020 |
| Aduro Creative Ltd. | London | 2018 |
| Aduro-It Limited | Woking | 2011 |
| Aduunyo Records Limited | Hook | 2025 |
| Aduven Enterprises Limited | London | 2026 |
| Aduvi Limited | Exeter | 2018 |
| Aduvo Limited | St John'S Wood | 2006 |
| ADV Devtech Ltd | Kington | 2022 |
| ADV Fusionex Limited | Birmingham | 2008 |
| ADV Media Partners Ltd | London | 2014 |
| ADV Media Productions Limited | Stockport | 2024 |
| ADV Mobility Solutions Ltd | London | 2021 |
| Advacom Limited | Kent | 1998 |
| Advadanet Limited | London | 2022 |
| Advai Ltd | London | 2020 |
| Advaice Limited | Reading | 2025 |
| Advaita Pharmaceutical and Clinical Services Limited | Reading | 2015 |
| Advaita Wellness Ltd | Leeds | 2025 |
| Advaith IT Solutions Ltd | Basingstoke | 2025 |
| Advaitha Consulting UK Limited | High Wycombe | 2010 |
| Advaitha Limited | Droitwich | 2024 |
| Advalorem Risk Advisory Ltd | Hail Weston | 2015 |
| Advaltis Limited | London | 2019 |
| Advance - Adtech Ltd | London | 2024 |
| Advance AI Ltd | Abbotsley | 2022 |
| Advance AI Services Ltd | London | 2025 |
| Advance Analytica Limited | Bradford | 2024 |
| Advance AVP Limited | Northallerton | 2009 |
| Advance Cabling Solutions Ltd | Stirling | 2017 |
| Advance Carbon Offsetting Ltd | Spalding | 2024 |
| Advance Cash Register Limited | Dunstable | 1975 |
| Advance Chronicle Limited | London | 2011 |
| Advance Communications UK Limited | Cardiff | 2007 |
| Advance Computer Centre Limited | London | 1988 |
| Advance Computer Services Limited | East Sussex | 1992 |
| Advance Computing Solutions Limited | London | 2015 |
| Advance Data Analytics Limited | Sutton | 2024 |
| Advance Data Solutions Limited | London | 2025 |
| Advance Digital (Yorkshire) Ltd | Scarborough | 2009 |
| Advance Digital Limited | Eastleigh | 2022 |
| Advance Digital Solutions Ltd | Stevenage | 2017 |
| Advance Dynamics Ltd | Blandford Forum | 2020 |
| Advance Global IT Support Ltd | London | 2020 |
| Advance Hashtag Limited | Bromley | 2015 |
| Advance Health Technologies Ltd | West Terrace | 2020 |
| Advance in IT Limited | London | 2011 |
| Advance IT Group Limited | Epsom | 2007 |
| Advance IT Ltd | Doncaster | 2018 |
| Advance IT Solutions Limited | Epsom | 2006 |
| Advance IT Systems Limited | Epsom | 2006 |
| Advance Itsm Limited | Wednesbury | 2009 |
| Advance Leap International Limited | Luton | 2025 |
| Advance Leap Limited | Wilmslow | 2016 |
| Advance Legal Solutions Limited | London | 2017 |
| Advance Ltd | London | 2023 |
| Advance Media Ltd | London | 2016 |
| Advance Myanmar Ltd | London | 2010 |
| Advance Networks Limited | Leicester | 2003 |
| Advance Performance Coach Ltd | London | 2025 |
| Advance Point Solutions Limited | Luton | 2025 |
| Advance Presence Solutions Ltd | Bradford | 2024 |
| Advance Project Planning Ltd | Blairgowrie | 2024 |
| Advance PSC Limited | Southampton | 2025 |
| Advance Publishing Ltd | Newcastle Upon Tyne | 2024 |
| Advance QA Ltd | Shipley | 2024 |
| Advance Security Solutions Ltd | Barking | 2022 |
| Advance Services and Solutions Limited | Reading | 2004 |
| Advance Services Group Ltd | Manchester | 2019 |
| Advance Sharepoint Ltd | Carmarthen | 2013 |
| Advance Solutions Corp Ltd | Belfast | 2024 |
| Advance Tech (UK) Ltd | Chorley | 2010 |
| Advance Tech Global Ltd | Somerton | 2023 |
| Advance Tech Services Ltd | London | 2025 |
| Advance Telecom (UK) Limited | Kent | 2004 |
| Advance Traders Limited | Harrow | 2002 |
| Advance Training and Consulting Ltd | Sittingbourne | 2022 |
| Advance Web Software Limited | London | 2023 |
| Advance Your PAY Limited | Rayleigh | 2020 |
| Advancecentre Limited | Waterlooville | 2000 |
| Advanced IT Solutions UK Limited | Middlesex | 2005 |
| Advanced Additive Manufacturing Technology Ltd | Mildenhall | 2025 |
| Advanced Agri-Tech Solutions Ltd | Huddersfield | 2020 |
| Advanced AI Limited | London | 2024 |
| Advanced AI Marketing Ltd | Llanelli | 2026 |
| Advanced Analytica Limited | Cheltenham | 2013 |
| Advanced Analytics Labs Ltd | Waringstown | 2017 |
| Advanced Analytics Limited | Barnet | 2022 |
| Advanced Animations (UK) Limited | Greater Manchester | 2011 |
| Advanced App Develop Marketing Software Creating Group Limited | London | 2025 |
| Advanced Approach Limited | Southport | 2009 |
| Advanced Broadcast Integration Ltd | Basingstoke | 2012 |
| Advanced Broadcast Services Limited | London | 2000 |
| Advanced Business Consulting Limited | Edgware | 2021 |
| Advanced Business Innovation Limited | Cardiff | 2020 |
| Advanced Business Machines (North West) Limited | Liverpool | 1990 |
| Advanced Business Software Limited | Worcester | 2003 |