| Acres Landscaping Ltd | Chelmsford | 2025 |
| Acres Pet Cremation Ltd | Southminster | 2025 |
| Acres Wild Limited | West Sussex | 2001 |
| ACRES22.COM Limited | Leeds | 2024 |
| Acresfield Developments Limited | Bolton | 2016 |
| Acresis UK Limited | Cambridge | 2015 |
| Acrestrand Ltd | London | 2003 |
| Acret Ltd | London | 2025 |
| Acreven Ltd | Peterborough | 2021 |
| Acria DX Ltd | Cambridge | 2023 |
| Acrial Ltd | Croydon | 2024 |
| Acridge Limited | Bakewell | 2011 |
| Acrifa Energy Limited | London | 2024 |
| Acrimon Veterinary Services Ltd | London | 2024 |
| Acrin (Tobaccos) Limited | London | 1946 |
| Acrio Limited | Motherwell | 2009 |
| Acrion Limited | Swindon | 2017 |
| Acris Consultants Limited | | 1989 |
| Acrity Limited | Aylesbury | 2013 |
| Acrivia Ltd | London | 2022 |
| Acro Aeronautical Services Limited | Peterborough | 1983 |
| Acro Agency Ltd | London | 2020 |
| Acro Aviation Services Limited | Horsham | 2025 |
| Acro Ecology Ltd | Newquay | 2024 |
| Acro Holdings Limited | Northampton | 2017 |
| Acro Technical Services Limited | Isle Of Lewis | 2025 |
| Acrobat Consulting and Marketing Limited | Cheadle | 1995 |
| Acrobat Corporate Services Ltd. | Canterbury | 1998 |
| Acrobat Ltd | Winchester | 2015 |
| Acrobiosystems Limited | Chessington | 2021 |
| Acroft Digital Ltd | Wilmslow | 2024 |
| Acrogen Limited | Weymouth | 1995 |
| Acrokool Limited | Saffron Walden | 1984 |
| Acroma Limited | Twickenham | 2006 |
| Acron Asbestos Ltd | Glasgow | 2011 |
| Acron Limited | London | 2022 |
| Acronex Limited | London | 2017 |
| Acronym Asset Management Ltd. | Saffron Walden | 2022 |
| Acronym BIM Ltd | Glasgow | 2024 |
| Acronym Community Empowerment (Ace) | Liverpool | 2015 |
| Acronym Group Ltd | Kidlington | 2024 |
| Acropolis Consultants Limited | London | 2020 |
| Acropolis Developments Limited | Aylesford | 1997 |
| Acros Pharma Services Limited | Wokingham | 2013 |
| Acrospire Holdings Limited | Basingstoke | 2020 |
| Across 110TH Ltd. | Poole | 2015 |
| Across Borders Consulting Limited | Belfast | 2020 |
| Across Borders Educare Ltd | Ilford | 2020 |
| Across Boundaries Consulting Ltd | Epsom | 2025 |
| Across Design Ltd | London | 2010 |
| Across Drug Delivery Solutions Ltd | Glasgow | 2026 |
| Across Expert Limited | Doncaster | 2017 |
| Across Pilgrimages & Travel | Bishop'S Stortford | 2019 |
| Across the Board Fieldwork Limited | Kingsbury | 2018 |
| Across the Line Consulting Ltd | London | 2020 |
| Across the Line Ltd | Aylesbury | 2023 |
| Across the Pond Group Limited | London | 2009 |
| Across the Pond Revenue Solutions Limited | Warrington | 2023 |
| Across the Universe Communications Ltd | London | 2015 |
| Across the Universe Ventures Limited | Northwood | 2021 |
| Acrossform Projects Limited | Llansamlet, Swansea | 1993 |
| Acrosswater Limited | Lichfield | 1996 |
| Acrossworks Ltd | London | 2024 |
| Acroterion Ltd | Bexhill On Sea | 2016 |
| Acroweb Limited | East Wittering | 2013 |
| Acrston Ltd | Monmouth | 2026 |
| Acrt Services Limited | Glasgow | 2022 |
| Acru Limited | London | 2025 |
| Acrux Ltd | London | 2024 |
| Acrux Partners Ltd | London | 2015 |
| Acryate Research and Development Limited | Rochdale | 2004 |
| Acrylic Artists Limited | Princes Risborough | 2022 |
| ACS (UK) Consulting Limited | Ashby-De-La-Zouch | 2004 |
| ACS - Advanced Corporate Solutions Limited | London | 2025 |
| ACS Accountants Ltd | Portsmouth | 2014 |
| ACS Accounting (Berkshire) Limited | Wokingham | 2004 |
| ACS Accounts Services Ltd | Dartford | 2014 |
| ACS Asbestos Measurement &Testing Limited | Kilmacolm | 2023 |
| ACS Bespoke Engineering Limited | Cradley Heath | 2025 |
| ACS Bookkeeping Services Ltd | Teddington | 2017 |
| ACS Business Change Ltd | Lymington | 2011 |
| ACS Commercial Risk Engineering Ltd | London | 2024 |
| ACS Commercial Roofing Ltd | Halifax | 2023 |
| ACS Computers Limited | Devon | 2002 |
| ACS Consultancy Services Ltd | Gateshead | 2024 |
| ACS Design and Management Ltd | Devizes | 2026 |
| ACS Design Consultancy Limited | Dunstable | 2023 |
| ACS Detailing Ltd | Rochdale | 2023 |
| ACS Direct Limited | Bury | 2019 |
| ACS Employee Ownership Trustee Limited | Pontypridd | 2024 |
| ACS Endoscopy Limited | Salisbury | 2021 |
| ACS Engineering Consulting Ltd | London | 2025 |
| ACS Engineering Services Limited | Blackburn | 2024 |
| ACS Europe Limited | Greater London | 2023 |
| ACS Executive Limited | Hove | 2026 |
| ACS Fire Protection Limited | Luton | 2017 |
| ACS Fire Safety Ltd | Rochester | 2026 |
| ACS Food Consultancy Limited | Lymm | 2016 |
| ACS Global Education Ltd | London | 2020 |
| ACS Global Management Ltd | Glasgow | 2012 |