| Achieva Group Limited | London | 2020 |
| Achieva Investments Limited | Harrow | 2022 |
| Achieva Limited | Harrow | 2021 |
| Achievable Care Quality Community Ltd | Tewkesbury | 2024 |
| Achievable Group Ltd | Tyne And Wear | 2023 |
| Achieve Breakthrough Trustees Limited | Bath | 2023 |
| Achieve Business Solutions Limited | Hythe | 2010 |
| Achieve Care Solutions Ltd | Manchester | 2011 |
| Achieve Coaching & Training Ltd | East Sussex | 2006 |
| Achieve Competitive Advantage Ltd | Riding Mill | 2011 |
| Achieve Corporation Ltd | London | 2014 |
| Achieve Events Ltd | Nottingham | 2019 |
| Achieve for Life Ltd | London | 2023 |
| Achieve Global Services Ltd | Tidworth | 2026 |
| Achieve Group Ltd | Ilford | 2018 |
| Achieve Holdings Limited | Woodford Green | 2018 |
| Achieve Medix Ltd | Telford | 2005 |
| Achieve Professionals Limited | Middlesbrough | 2023 |
| Achieve Recruitment Ltd | Waterlooville | 2024 |
| Achieve Safety Ltd. | Warrington | 2008 |
| Achieve Search Ltd | Leeds | 2024 |
| Achieve Social Care Ltd | Macclesfield | 2025 |
| Achieve Together Services Limited | Leatherhead | 2022 |
| Achieve UN Limited | Brighton | 2017 |
| Achieve Your Dreams Limited | Herne Bay | 2017 |
| ACHIEVE24HEALTH Home Care Ltd | Huntingdon | 2025 |
| ACHIEVE2GETHER Limited | Chichester | 2022 |
| Achievecleaning Ltd | Milton Keynes | 2026 |
| Achievement Recruitment Ltd | Dudley | 2026 |
| Achiever Group Ltd | Glasgow | 2025 |
| Achiever Ltd | London | 2022 |
| Achieverplus Services Ltd | Gillingham | 2026 |
| Achievers Cleaning Limited | Harlow | 2025 |
| Achievers Healthcare Limited | Milton Keynes | 2022 |
| Achievers Recruitment Ltd | Dunstable | 2022 |
| Achievers Support CIC | Waltham Cross | 2019 |
| Achieving Results in Communities CIC | Leamington Spa | 2011 |
| Achievingoals Limited | London | 2008 |
| Achille Administration Services Limited | Bletchingley | 2011 |
| Achille Construction Service Ltd | Poole | 2025 |
| Achilleion Travel Ltd | Doncaster | 2021 |
| Achilles Clean Limited | Enfield | 2022 |
| Achilles Foot Clinic Limited | Brighton | 2018 |
| Achilleus Security (East) Limited | London | 2017 |
| Achilleus Security (London) Limited | London | 2018 |
| Achilleus Security (North) Limited | Cardiff | 2019 |
| Achilleus Security Management Ltd | Peterborough | 2019 |
| Achmedia Ltd | Cambridge | 2010 |
| Achnaduin Limited | Oban | 2016 |
| Achomer Energy Ltd | Perth | 2011 |
| Achonu Limited | Northolt | 2025 |
| Achr Ltd | St. Neots | 2022 |
| Achu Ltd | Hatfield | 2026 |
| Achw Limited | Poole | 2025 |
| ACI & Lords Services Ltd | London | 2025 |
| ACI (Northern) Limited | Sheffield | 2010 |
| ACI Directors Limited | Hitchin | 2014 |
| ACI Support Services Limited | London | 2020 |
| ACI Technical Solutions Limited | Leeds | 2011 |
| ACI UK Learning Limited | Guildford | 2006 |
| Aci-Uk Limited | Blackpool | 1999 |
| Acia Aero Leasing North Sea Limited | Reading | 2022 |
| Acid Marketplace Ltd | Chichester | 2013 |
| Acies Cleaning & Support Services Limited | Brighton | 2015 |
| Acies Limited | Cinderford | 2016 |
| Acif Limited | Swindon | 2020 |
| Acionna Ltd | Manchester | 2024 |
| Acire Recruitment Agency Ltd | Birmingham | 2020 |
| Acitt Ltd | Peterborough | 2011 |
| ACJ Accountants Limited | Radlett | 2024 |
| ACJ Cranes Limited | Southampton | 2019 |
| ACJ Credit Management Ltd | Winchester | 2003 |
| ACJ Holdings Limited | Bewdley | 2018 |
| ACJ Management Services Limited | Taunton | 2005 |
| ACJ Plant Hire Limited | Southampton | 2021 |
| ACJ Plant Ltd | London | 2016 |
| ACJ Search Limited | Birmingham | 2019 |
| ACJ Security Systems Ltd | Sidcup | 2019 |
| ACJ Talent Partners Ltd Trading AS Respond Recruitment Ipswich Limited | Ipswich | 2025 |
| Acjj Limited | Coventry | 2020 |
| Acjlc Consulting Ltd Ltd | Glasgow | 2024 |
| Acjul Ltd | Norwich | 2023 |
| ACK Packaging Ltd | Farrington Gurney | 2023 |
| ACK Property Services Limited | Ilford | 2012 |
| Ackan Recruitment Limited | Leeds | 2024 |
| Ackerman Pierce Group Ltd | Surbiton | 2024 |
| Ackerman Pierce Limited | Surbiton | 2013 |
| Ackerman Pierce Payroll Ltd | Wolverhampton | 2026 |
| Ackers Roofing and Cladding Ltd | Blackburn | 2019 |
| Ackhurst Construction & Project Management Limited | Wigan | 2016 |
| Acklam Intruder Alarms Ltd | Middlesbrough | 2018 |
| Acknowledge Designs Ltd | London | 2014 |
| Acks Global Limited | Nottingham | 2018 |
| ACL (AR) Ltd | Altrincham | 2020 |
| ACL (Worcester) Ltd | Droitwich | 2017 |
| ACL 2007 Ltd | Cheltenham | 2007 |
| ACL Asset Management Limited | London | 2003 |
| ACL Automotive Contracts Ltd | Maidstone | 2007 |
| ACL Automotive Ltd | Maidstone | 2010 |
| ACL Brickwork Limited | Leigh-On-Sea | 2014 |