| AC Management Limited | London | 1999 |
| AC Mortgage & Protection Solutions Limited | Hertford | 2022 |
| AC Mortgages Limited | Beckenham | 2015 |
| AC Newco Limited | Loughborough | 2023 |
| AC Overseas Limited | London | 2024 |
| AC Plastics (EOT) Limited | Liverpool | 2021 |
| AC Port Services Ltd | Rotherham | 2026 |
| AC Private Finance Ltd | Oldbury | 2019 |
| AC Prop 1 Limited | London | 2021 |
| AC Response Holdings Limited | High Wycombe | 2021 |
| AC Rowley Limited | Leigh-On-Sea | 2025 |
| AC SAP Holding Limited | Stoke On Trent | 2021 |
| AC TGP I Limited | London | 2020 |
| AC Timber Packs Ltd | Ely | 2024 |
| AC Townsend Holdings Limited | Hitchin | 2026 |
| AC Trading & Investments Ltd | Bagshot | 2026 |
| AC Training Holdco Limited | London | 2020 |
| AC Ventures (Belfast) Limited | Belfast | 2023 |
| AC Wealth Management Limited | Hove | 2022 |
| AC Wealth Solutions Limited | Bexley | 2011 |
| Ac-Cc Holdings Limited | Bold | 2025 |
| Ac/Dc Investments Ltd | London | 2020 |
| AC19 Limited | London | 2019 |
| AC2000 Holdings Ltd | St. Albans | 2026 |
| AC360 Ltd | Loughborough | 2025 |
| ACA (Midlands) Holdings Limited | Greater Manchester | 2022 |
| ACA Asset Holdings Ltd | Colchester | 2025 |
| ACA Compliance (Europe) Limited | London | 2002 |
| ACA Corporate Holdings Ltd | Moy | 2024 |
| ACA Group Limited | Inchinnan | 2016 |
| ACA Invest Ltd | Wigan | 2026 |
| ACA Marine Limited | London | 2017 |
| ACA Philanthropy and Fundraising Ltd | London | 2012 |
| ACA Property Holdings Ltd | Barnet | 2023 |
| ACA Risks Limited | Stockport | 2016 |
| Aca-Toro Ltd | Ruislip | 2022 |
| Acacia Financial Services Limited | Bishop'S Stortford | 2000 |
| Acacia Groundcare Group Ltd | Henfield | 2025 |
| Acacia Holdings (Shropshire) Ltd | Bridgnorth | 2023 |
| Acacia Holdings GP Limited | London | 2022 |
| Acacia Holdings Ltd | Rugeley | 2016 |
| Acacia JA Holdings Limited | Chichester | 2026 |
| Acacia Mortgages Limited | Stourport On Severn | 2001 |
| Acacia Outdoors UK Finco 1 Limited | London | 2026 |
| Acacia Outdoors UK Manco Limited | London | 2026 |
| Acacia Outdoors UK Topco Limited | London | 2026 |
| Acacia Property Capital Limited | Harrow | 2018 |
| Acacia Wealth Limited | London | 2009 |
| Acacia-Mib Ltd | London | 2023 |
| Acacium Group Limited | London | 2020 |
| Acad Holdings Limited | Harrogate | 2006 |
| Acad Ltd | Harrogate | 2018 |
| Academia Group Limited | Bury St Edmunds | 2004 |
| Academic Appointments 2017 Limited | Leeds | 2017 |
| Academically Ltd | Newcastle Upon Tyne | 2019 |
| Academy Coffee Holdings Limited | Barry | 2018 |
| Academy Financial Services Limited | Billericay | 2010 |
| Academy Insurance Services Limited | Reading | 1995 |
| Academy Investment Group Limited | Birmingham | 2024 |
| Academy Motor Group Limited | Manchester | 2016 |
| Academy of Coaching & Training Ltd | Abingdon | 2011 |
| Academy of Music & Sound (Holdings) Limited | Exeter | 2021 |
| Academy Services (Holdings) Limited | Swanley | 2001 |
| Acadia Bidco Limited | Brighton | 2025 |
| Acadia Holdings Limited | London | 2025 |
| Acadia Management Limited | Southwick | 2017 |
| Acadia Midco Limited | Brighton | 2025 |
| Acadia Topco Limited | Brighton | 2025 |
| Acadian Asset Management (UK) Limited | London | 2005 |
| Acai Finance Ltd | London | 2022 |
| Acai Group Holdings Limited | London | 2020 |
| Acai Holding Ltd | London | 2018 |
| Acai Ltd | Watford | 2013 |
| Acai Ventures Ltd | Birmingham | 2026 |
| Acaiva Group Ltd | Romford | 2026 |
| Acal BFI Group Limited | Wokingham | 2021 |
| Acal BFI Holdings Limited | Wokingham | 2021 |
| Acal BFI Midco 1 Limited | Wokingham | 2021 |
| Acal BFI Midco 2 Limited | Wokingham | 2021 |
| Acal Capital Advisory Ltd | London | 2018 |
| Acalton Limited | London | 2022 |
| Acam Aviation Capital Ltd | London | 2026 |
| Acam Invest Limited | Pembs | 2009 |
| Acanthus Capital Limited | London | 2014 |
| Acanthus U.S. Ltd | London | 2023 |
| Acap Real Estate Ltd | London | 2018 |
| Acapo Holdings Ltd | Nottingham | 2021 |
| Acaps Holdings Ltd | Woodford Green | 2020 |
| Acapuk Limited | Billingham | 2024 |
| Acar International Group Ltd | London | 2026 |
| Acar Management Ltd | London | 2019 |
| ACAR2GO Holdings Ltd | Aylesbury | 2021 |
| Acas Group Holdings Ltd | Batley | 2022 |
| Acas Group Ltd | Bamber Bridge | 2016 |
| Acas Holdings Limited | Bedford | 2023 |
| Acast Group Ltd | Spalding | 2017 |
| Acasta Europe Limited | Cheadle | 2010 |
| Acasta Partners Holdings Limited | London | 2024 |
| Acaster Lloyd Holdings Ltd | London | 2025 |
| Acaster Lloyd Trustee Limited | London | 2026 |