| Acorn Security Locksmiths Limited | London | 1999 |
| Acorn Security Services Limited | Ilford | 2018 |
| Acorn Services (Northwood) Ltd | Bristol | 2020 |
| Acorn Services Group Limited | Claygate | 2002 |
| Acorn Sheetmetal Ltd | Hull | 2018 |
| Acorn SQ Ltd | London | 2019 |
| Acorn Statistical Analysis Ltd | Didcot | 2023 |
| Acorn Storage Ltd | London | 2026 |
| Acorn Support Limited | Stourbridge | 2009 |
| Acorn Surveys Limited | Goole | 2002 |
| Acorn Sussex Limited | Hailsham | 2002 |
| Acorn Talent Partners Ltd | Hornchurch | 2026 |
| Acorn Taxis Thetford Ltd | Thetford | 2019 |
| Acorn Technical Consulting Limited | Chipping Norton | 2008 |
| Acorn Technical Holdings Limited | Ilchester | 2007 |
| Acorn to Oak Environmental Ltd | Reading | 2022 |
| Acorn to Oak Landscaping Ltd | Norwich | 2020 |
| Acorn Translations Limited | South Nutfield | 1999 |
| Acorn Travel Group Ltd | Stourbridge | 2011 |
| Acorn Tree & Landscapes Ltd | Chippenham | 2026 |
| Acorn Tree Investments Limited | Leigh-On-Sea | 2024 |
| Acorn Tree Services Nottingham Limited | Nottingham | 2016 |
| Acorn Trees Ipswich Limited | Ipswich | 2026 |
| Acorn Trees Ltd | Polegate | 2017 |
| Acorn UK Enterprises Ltd | London | 2017 |
| Acorn Utilities Limited | Milton Keynes | 2010 |
| Acorn Vehicles Limited | Beaconsfield | 2009 |
| Acorn Venture Holdings Limited | Stourbridge | 2011 |
| Acorn Venture Limited | Bromsgrove | 1988 |
| Acorn Waste Management Limited | Shrewsbury | 2002 |
| Acorn Waste Services Limited | Old Hatfield | 2010 |
| Acorn West Ltd | Oldham | 2022 |
| Acorn Willow Limited | London | 2015 |
| Acorns (Holdings) Limited | Cardiff | 2018 |
| Acorns (Southern) Limited | Southampton | 2019 |
| Acorns and Oaks Limited | Orpington | 2021 |
| Acorns Management Company (1988) Limited | Northampton | 1988 |
| Acoro Services Limited | London | 2011 |
| Acorus Gardens Limited | Saffron Walden | 2022 |
| Acost Ltd | London | 2012 |
| Acoteias Limited | Bournemouth | 2016 |
| Acoup Ltd | Edinburgh | 2022 |
| Acoura Holdings Limited | Birmingham | 2010 |
| Acousonic Limited | | 2007 |
| Acoustiblok UK Limited | Ashford | 2003 |
| Acoustic Air Technology Limited | London | 2020 |
| Acoustic Angels Limited | Sheffield | 2011 |
| Acoustic Cloud Limited | Ashford | 2011 |
| Acoustic Trademarks Limited | London | 2019 |
| Acousticlean Ltd | Romford | 2025 |
| ACP (NO 5) Ltd | Nottingham | 2019 |
| ACP (NO3) Limited | Nottingham | 2019 |
| ACP (North West) Limited | Manchester | 2007 |
| ACP ALL Clean Plus Ltd | Wokingham | 2016 |
| ACP Assist Limited | Cottingham | 2023 |
| ACP Cleaning Services Limited | Nelson | 2015 |
| ACP Enterprise Ltd | Wembley | 2012 |
| ACP Exec Limited | London | 2018 |
| ACP Facilities Management Limited | Stockport | 2025 |
| ACP Landscapes & Builders Limited | Clacton-On-Sea | 2017 |
| ACP Marketing UK Limited | London | 2000 |
| ACP Music Ltd | Horsham | 2004 |
| ACP Promotions Ltd | Lincoln | 2002 |
| ACP Training & Development Ltd | Braintree | 2007 |
| ACP: North Hub Limited | Edinburgh | 2009 |
| Acpes Consulting Ltd | Luton | 2017 |
| ACQ Locksmiths Ltd | Southampton | 2009 |
| Acqua Cleaning Solutions Ltd | London | 2024 |
| Acqua Resourcing Ltd | London | 2026 |
| Acqua Surveying Ltd | Buckingham | 2011 |
| Acquablanca Limited | London | 2013 |
| Acquaint Consolidated Holdings Limited | Corby | 2023 |
| Acquaint Consolidated Services Limited | Corby | 2006 |
| Acquappesa Limited | Stanmore | 2014 |
| Acquda Limited | Leeds | 2021 |
| Acquda Solutions Limited | Cardiff | 2021 |
| Acquentis Limited | Portsmouth | 2018 |
| Acquera Club UK Ltd | London | 2024 |
| Acquester Ltd | Middlewich | 2026 |
| Acquiesce Training Ltd | Warrington | 2013 |
| Acquire Connect Ltd | Birmingham | 2023 |
| Acquire Digital Talent Limited | London | 2018 |
| Acquire Matsa Group Ltd | Luton | 2026 |
| Acquire PAY Ltd | London | 2016 |
| Acquire PMS Limited | London | 2020 |
| Acquire Recruitment Limited | Durham | 2022 |
| Acquire Semiconductor Limited | York | 2024 |
| Acquire Services Group Ltd | London | 2019 |
| Acquireasy Limited | Ringwood | 2025 |
| Acquired Talent Ltd | London | 2020 |
| Acquiring & Retiring Ltd | Wakefield | 2015 |
| Acquis Arche Limited | London | 2022 |
| Acquis Consulting UK Limited | London | 2016 |
| Acquisition & Promotions Ltd | Leicester | 2025 |
| Acquisition 395445574B Limited | London | 2016 |
| Acquisition Advisory Limited | Christchurch | 2025 |
| Acquisition Funding Experts UK Ltd | Sheffield | 2024 |
| Acquisition IT Limited | Barnsley | 2016 |
| Acquisition Origination Services Limited | London | 1994 |
| Acquisition People Limited | Ware | 2026 |