| Access Overseas Company Holdings Limited | Loughborough | 2018 |
| Access Paysuite Ltd | Loughborough | 2002 |
| Access Platform Solutions Limited | Stoke-On-Trent | 2020 |
| Access Property Finance Limited | London | 2015 |
| Access Repairer Funding Ltd | Whitefield | 2010 |
| Access Self Storage (Insurance Administration) Limited | | 2004 |
| Access to Growth GM Limited | Sheffield | 2017 |
| Access to Investment GM Limited | Sheffield | 2020 |
| Access to Profit Ltd | Bury St. Edmunds | 2008 |
| Access to Property Ltd | Leicester | 2016 |
| Access Training Enterprises Ltd | Swansea | 2024 |
| Access Underwriting Limited | Gloucester | 1999 |
| Access USD Ltd | Loughborough | 2022 |
| Access VC Limited | Slough | 2019 |
| ACCESS2HEALTHCARE Ltd | Arundel | 2010 |
| ACCESS2LEARN Holdings Limited | Southampton | 2025 |
| Accessia Group Ltd | London | 2021 |
| Accessible Accounting Limited | Wimborne | 2018 |
| Accessible Insurance Services Ltd | Milton Keynes | 2021 |
| Accessible Payment Solutions Ltd | Halesowen | 2020 |
| Accesspoint Group Holdings Limited | London | 2015 |
| Accg Holdings Ltd | London | 2023 |
| Accident & Health Underwriting Limited | Bishop'S Stortford | 2000 |
| Accident & Injury Associates Limited | Birmingham | 2011 |
| Accident and Claims Ltd | London | 2016 |
| Accident Claim Management Ltd | Middlesex | 2019 |
| Accident Claims Services Limited | London | 2004 |
| Accident Compensation (Scotland) Ltd | Glasgow | 2009 |
| Accident Direct Claims Limited | Birmingham | 2012 |
| Accident Hotline Limited | North Shields | 2005 |
| Accident Intelligence Holdings Limited | Aylesbury | 2025 |
| Accident Solution Claims Ltd | London | 2011 |
| Accident Solutions (Dartford) Limited | Barking | 2012 |
| Accident Solutions Nottingham Limited | Nottingham | 2012 |
| Accident Specialists Watford Limited | Watford | 2014 |
| Accident Support Group Limited | London | 2008 |
| Accident Support Limited | London | 1997 |
| Accio Finance Ltd | Nottingham | 2019 |
| Accio Group (Holdings) Ltd | Nottingham | 2025 |
| Acclaim Contracts Holding Limited | Wickford | 2022 |
| Acclaimed Mortgage Consultancy Ltd | Coventry | 2020 |
| Acclaimed Services Limited | Sittingbourne | 2019 |
| Acclarans Ltd | London | 2018 |
| Acclimatise Management Limited | Derby | 2015 |
| Accm Capital Ltd | Broadstairs | 2022 |
| Acco Europe Trustee Company Limited | Aylesbury | 1969 |
| Acco Systems Holdings Limited | Cradley Heath | 2025 |
| Acco UK Finance 1 Limited | Aylesbury | 2025 |
| Acco UK Finance 2 Limited | Aylesbury | 2025 |
| Acco UK Holdings 1 Limited | Aylesbury | 2025 |
| Acco UK Holdings 2 Limited | Aylesbury | 2025 |
| Accolade Building Partnership Ltd | Bournemouth | 2021 |
| Accolade Education Equipment Leasing Limited | Torpoint | 2023 |
| Accolade Education Finance Holdings Limited | Torpoint | 2023 |
| Accolade Education Finance Limited | Torpoint | 2017 |
| Accolade Education Financial Investments Limited | Torpoint | 2023 |
| Accolade Finance Holdings Limited | Torpoint | 2022 |
| Accolade Finance Investments Limited | Torpoint | 2022 |
| Accolade Finance Limited | Torpoint | 1996 |
| Accolade Financial Planning Ltd | Burgess Hill | 2025 |
| Accolade Group Limited | London | 2025 |
| Accolade Group NW Ltd | Liverpool | 2023 |
| Accolade Industrial Holdings Limited | Stoke On Trent | 2025 |
| Accompagna Limited | Chislehurst | 2013 |
| Accomplish Acquico Ltd | Halesowen | 2022 |
| Accomplish Group Bidco Limited | Halesowen | 2014 |
| Accomplish Group Holdco Limited | Halesowen | 2014 |
| Accomplish Group Interco Limited | Halesowen | 2014 |
| Accomplish Group Midco Limited | Halesowen | 2014 |
| Accomplish Mipco Limited | Halesowen | 2022 |
| Accomplished Financial Solutions Ltd | Leicester | 2023 |
| Accon BPS Ltd | Bury St Edmunds | 2020 |
| Accor (U.K.) Limited | London | 1982 |
| Accora Holdings Ltd | Royston | 2022 |
| Accord Bidco Limited | Wigan | 2015 |
| Accord Compliance Limited | Melton Mowbray | 2021 |
| Accord Holdings (South East) Ltd | Eastbourne | 2023 |
| Accord International Planning Limited | Bristol | 2018 |
| Accord Investment Partners Ltd | London | 2020 |
| Accord Language Schools Limited | Shanklin | 2013 |
| Accord Living Developments Ltd | Hemel Hempstead | 2026 |
| Accord Midco Limited | London | 2015 |
| Accord Mortgages Limited | Bradford | 1987 |
| Accord Topco Limited | London | 2015 |
| Accordant (RDA) UK Limited | Shoreham-By-Sea | 2026 |
| Accordant Holdings Limited | London | 2026 |
| Accordia Mortgages Ltd | Tunbridge Wells | 2016 |
| Accordial Holdings Limited | Smethwick | 2021 |
| Account for YOU Ltd | Purfleet-On-Thames | 2018 |
| Account on Time Limited | Surrey | 2014 |
| Accountability Financial Solutions Ltd | Washington | 2012 |
| Accountability Group Holdings Ltd | Basingstoke | 2024 |
| Accountability Solutions Limited | Watford | 2009 |
| Accountably Holdings Ltd | Southampton | 2024 |
| Accountancy 4 Limited | Droitwich | 2026 |
| Accountancy Exam Masters Holdings Ltd | Maldon | 2023 |
| Accountancy Holdings Limited | Corby | 2024 |
| Accountancy Outsourcing Services Ltd | London | 2023 |
| Accountancypro Limited | Guildford | 2023 |
| Accountant Sea Ltd | Fareham | 2023 |