| Acceszibles Limited | Milton Keynes | 2019 |
| Accevo Accountancy Limited | Fareham | 2012 |
| ACCEXX360 Consultancy Limited | London | 2025 |
| Accfin Services Ltd | Warrington | 2022 |
| Accfinix Limited | Sidcup | 2025 |
| Accfit Ltd | Southampton | 2021 |
| Accident & Injury Helpline Limited | Elland | 2010 |
| Accident Answers Limited | Guildford, Surrey | 2004 |
| Accident Assist Network Ltd | Dunstable | 2025 |
| Accident Assist Nottingham Limited | Nottingham | 2012 |
| Accident Claim Solutions (UK) Limited | Mitcham | 2007 |
| Accident Claims Assist Limited | Canning Town | 2024 |
| Accident Claims Compensation Specialists Ltd | Slough | 2011 |
| Accident Claims Help Time Ltd | Hounslow | 2007 |
| Accident Claims Lawyers Limited | Manchester | 2020 |
| Accident Helpline Limited | Kettering | 1997 |
| Accident Law Group Ltd | Bradford | 2023 |
| Accident Lawyers Helpline (ALH) UK Ltd. | Chorley | 2012 |
| Accident Legal Group Limited | Chester Le Street | 2000 |
| Accident Line Limited | Welwyn Garden City | 2013 |
| Accident Management Advice Limited | Finchley | 2005 |
| Accident Management Services Limited | Southampton | 2001 |
| Accident Repair Centre (Scotland) Limited | Greenock | 2009 |
| Accident Repair Centre Uxbridge Limited | Northwood | 2022 |
| Accident Replacement Taxis Limited | Wigan | 2007 |
| Accident Solicitors Direct Limited | Sheffield | 2008 |
| Accident Solicitors Limited | Newcastle Upon Tyne | 2004 |
| Accidentassessors Ltd | Banbridge | 2013 |
| Accidentnavigator Ltd | Margate | 2015 |
| Accidents First Limited | Telford | 2003 |
| Acciel Consulting Ltd | London | 2013 |
| Accile Limited | Lincoln | 2023 |
| Accindo Fine Wines Limited | London | 2008 |
| Accio Consulting Limited | Beaconsfield | 2010 |
| Accio Depulso Limited | Altrincham | 2024 |
| Accio Global Ltd | Beckenham | 2016 |
| Accio TX Biobank Online Ltd | Newmarket | 2021 |
| Accio V Biobank Online Ltd | Newmarket | 2021 |
| Accipio Digital Ltd | St. Albans | 2017 |
| Accipio Hospitality Services Ltd | Chelmsford | 2025 |
| Accipio Leadership Ltd | St. Albans | 2017 |
| Accipiter Advisory Ltd | Thirsk | 2022 |
| Accipiter Commodity Headhunters Limited | London | 2026 |
| Accipiter Consulting Limited | Worcester | 2008 |
| Accipiter Designs Limited | Cardiff | 1987 |
| Accipiter Ltd | Boldon Colliery | 2021 |
| Accipiter Strategy Ltd | London | 2024 |
| Accipitrine Consulting Limited | Forest Row | 2009 |
| Accis Educational (UK) Ltd | Chelmsford | 2013 |
| Accis Investments Ltd | Chelmsford | 2013 |
| Accis Property Ltd | Chelmsford | 2013 |
| Accismo Ltd | Manchester | 2014 |
| Accl Stucks Limited | Nuneaton | 2017 |
| Acclaim (UK) Ltd | Upminster | 2014 |
| Acclaim Biomedical Consulting Ltd | Tetbury | 2014 |
| Acclaim Business Services Ltd | Harrow | 2011 |
| Acclaim Business Solutions Ltd | East Grinstead | 2011 |
| Acclaim Clinical Consulting Ltd | Solihull | 2024 |
| Acclaim Consulting Solutions Limited | Carshalton | 2008 |
| Acclaim Holdings Limited | Southampton | 2011 |
| Acclaim Legal Services Limited | Mold | 2013 |
| Acclaim Roofing Limited | 50 Alexandra Street, | 2003 |
| Acclaimed Accounting Ltd | Watchfield | 2021 |
| Acclaria UK Limited | Liphook | 2004 |
| Acclaro Accountancy & Bookkeeping Limited | Chesham | 2012 |
| Acclaro Advisory Limited | Wokingham | 2012 |
| Acclaro Localization & Technology Limited | London | 2023 |
| Acclaro Tax Accountants Ltd | Chelmsford | 2025 |
| Acclarogen Limited | Cambridge | 2009 |
| ACCLIM8 Limited | London | 2026 |
| Acclimation Ltd | York | 2019 |
| Acclivity Advisors Ltd | London | 2019 |
| Acclivity Project Services Ltd | Maidstone | 2024 |
| Accly Tax & Accounting Ltd | London | 2025 |
| Acclytics Accounting Ltd | Pinner | 2020 |
| Accma Accountants Ltd | Hounslow | 2006 |
| Accma Limited | London | 2006 |
| Accman & Co. Accountants Limited | Croydon | 2003 |
| Accnet Limited | Shoreham-By-Sea | 2002 |
| Accnet Solutions Limited | London | 2014 |
| Accnnum Limited | London | 2019 |
| Accnovate Ltd | Preston | 2025 |
| Accntax Ltd | Bolton | 2011 |
| Acco Books Limited | Ilford | 2022 |
| Acco Brands Europe Limited | Aylesbury | 2005 |
| Acco Digit Ltd | London | 2025 |
| Acco Europe Limited | Aylesbury | 1987 |
| Acco-Rexel Group Services Limited | Aylesbury | 1950 |
| Accoff Solutions Ltd | London | 2016 |
| Accofintax Ltd | London | 2025 |
| Accofox Ltd | Bury St. Edmunds | 2024 |
| Accola Services Ltd | Maldon | 2022 |
| Accolade Building Group Limited | Ringwood | 2010 |
| Accolade Consulting UK Limited | London | 2003 |
| Accolade Global Consulting Ltd | Coseley | 2019 |
| Accolade Heating Technologies Limited | Dunfermline | 2004 |
| Accolade L&D UK Limited | Rugby | 2020 |
| Accolade Management Ltd | Iver | 2022 |
| Accolade Measurement Ltd | Welwyn Garden City | 1993 |
| Accolade Property Group Ltd | Basingstoke | 2025 |