| Academy Photography Ltd | Newcastle Under Lyme | 2002 |
| Academy Portraits Limited | Cheltenham | 1998 |
| Academy Remedial Surveyors Limited | Redhill | 2012 |
| Academy Services (Norwich) Holdings Limited | London | 2005 |
| Academy Services (Oldham) Holdings Limited | London | 2005 |
| Academy Street Consulting Ltd | Dumfries | 2024 |
| Academy Success Divanova Ltd | London | 2025 |
| Academy Surveys Ltd | Epping | 2011 |
| Academy's Buildings Compliance Limited | London | 2016 |
| ACADEMY4 International Ltd | Neath | 2022 |
| Academyfd Ltd | Kettering | 2024 |
| Academyx Consulting Ltd | Edinburgh | 2026 |
| Acadent Limited | Cranleigh | 2003 |
| Acadevis Foreign Education Consultant Limited | Barking | 2022 |
| Acadia Accounting Limited | Cheshire | 2007 |
| Acadian Marine Holdings Limited | London | 2015 |
| Acadian Skye Limited | Glasgow | 2024 |
| Acadiant Limited | London | 2012 |
| Acadustri Limited | Reading | 2006 |
| Acaerus Limited | Worcester Park | 2019 |
| Acainn Ltd | Ryde | 2012 |
| Acair Marine Ltd | Kilmarnock | 2018 |
| Acair Maritime Ltd | Stornoway | 2017 |
| Acal Electronics Limited | Guildford | 1985 |
| Acamar Coaching Limited | Farnham | 2003 |
| Acams (UK) Ltd. | London | 2014 |
| Acan Ltd | Coventry | 2011 |
| Acanda Ltd | London | 2010 |
| Acanfora Design Ltd | London | 2015 |
| Acann Limited | Portsmouth | 2024 |
| Acantha Limited | London | 2024 |
| Acanthurus Ltd | Dorking | 2010 |
| Acanthus Accountancy Limited | Calne | 2008 |
| Acanthus Associated Architectural Practices Limited | Leeds | 1986 |
| Acanthus Change Limited | Retford | 2021 |
| Acanthus Darbyshire Architects Limited | Leeds | 2013 |
| Acanthus Holdings Limited | Cannock | 2005 |
| Acanthus W S M Architects Limited | Leeds | 1987 |
| Acap Advisory Ltd | London | 2015 |
| Acap Marketing Ltd | Manchester | 2024 |
| Acap Renewables Ltd. | London | 2021 |
| ACAP123 Ltd | Glasgow | 2019 |
| Acapella Capital Limited | London | 2018 |
| Acapella Publishing Resources Limited | Baldock | 2008 |
| Acapo Onsagers UK Ltd | Cambridge | 2023 |
| Acappella Accounting Limited | London | 2024 |
| Acar Associates Ltd | Ashton-Under-Lyne | 2019 |
| Acar Consultancy Ltd | London | 2020 |
| Acar Engineering Limited | Cardiff | 2011 |
| Acar Legal International Limited | London | 2020 |
| Acar Studio Limited | London | 2020 |
| Acara Finance Ltd | London | 2026 |
| Acaria Coaching & Consulting Ltd | Billericay | 2019 |
| Acars Qa/Qc Services Ltd | Inverurie | 2019 |
| Acarya Ltd | Tunbridge Wells | 2018 |
| Acas Consultants Ltd | Redditch | 2019 |
| Acasta Risk Limited | London | 2018 |
| Acaster Lloyd Consulting Limited | London | 2016 |
| Acaster Safety Management Limited | Leeds | 1997 |
| Acataro | Wigan | 2026 |
| Acatec Limited | Aberdeen | 2022 |
| Acav Ltd | Bedford | 2024 |
| Acazam Ltd | Watford | 2022 |
| ACB Accountancy & Bookkeeping Ltd | Nuneaton | 2021 |
| ACB Accountancy Services Ltd | Wrexham | 2018 |
| ACB Audit Limited | Ruardean | 2024 |
| ACB Consulting Limited | Buckingham | 2010 |
| ACB Fire Consultancy Limited | Ashford | 2012 |
| ACB Holdings Ltd | Rotherham | 2024 |
| ACB Management Consultancy Ltd | Hatch End | 2015 |
| ACB Management Services Ltd | Witney | 2025 |
| ACB PR Limited | Leicester | 2022 |
| ACB Project Consultancy Ltd | Peterborough | 2023 |
| ACB Projects and Consulting Ltd | Kidderminster | 2021 |
| ACB Properties Limited | Wadhurst | 1999 |
| ACB Quantity Surveying Ltd | Wokingham | 2019 |
| ACB Robotics Limited | Coventry | 2011 |
| ACB Scientific Services Ltd | London | 2018 |
| ACB Solutions (SW) Ltd | Bridgwater | 2019 |
| ACB Studio Ltd | Castlethorpe | 2024 |
| ACB Surveyors Ltd | Horsham | 2023 |
| ACB Training Ltd | Pontyclun | 2013 |
| ACB UK Consulting Ltd | Nottingham | 2026 |
| Acbc Tech Ltd | Newcastle Upon Tyne | 2018 |
| Acbl Consultancy Limited | Aylesbury | 2023 |
| Acbo Ltd | London | 2016 |
| Acbookkeepingservices Limited | Port Talbot | 2013 |
| Acbrands Limited | Congleton | 2024 |
| ACC Accountancy Ltd | Derby | 2011 |
| ACC Cons UK Ltd | South Queensferry | 2018 |
| ACC Consulting Ltd. | Woodbridge | 2005 |
| ACC Design Services Limited | Somerset | 2007 |
| ACC Experts Ltd | Romford | 2023 |
| ACC Finance Solutions Limited | London | 2023 |
| ACC Financial Services Limited | London | 2026 |
| ACC Group Holdings Limited | Leicester | 2019 |
| ACC Language Services Ltd. | Plymouth | 2016 |
| ACC Marine Consulting Limited | Gourock | 2022 |
| ACC Publishing Group Limited | Woodbridge | 1991 |
| ACC Quality Engineering & Inspection Services Ltd | Edinburgh | 2021 |