| Abacus Quantum Solutions Ltd | Manchester | 2020 |
| Abacus Resource Solutions Limited | London | 2015 |
| Abacus Risk Management Consultancy Services Limited | Birmingham | 2023 |
| Abacus Services (Highlands) Limited | Oban | 2020 |
| Abacus Software Development Limited | Birmingham | 1992 |
| Abacus Spares Limited | Mirfield | 2020 |
| Abacus Square Limited | Stowmarket | 2016 |
| Abacus Stock Auditors Limited | Weybridge | 2005 |
| Abacus Structural Limited | Birmingham | 2020 |
| Abacus Surveying Limited | Northampton | 2025 |
| Abacus Surveying Services Limited | Wolverhampton | 2008 |
| Abacus Surveyors Limited | Belvedere | 2024 |
| Abacus Talent Group Limited | Belfast | 2018 |
| Abacus Tax Advisors Ltd | Leeds | 2015 |
| Abacus Tax Consultants Ltd | Birmingham | 2017 |
| Abacus Tax Solutions Ltd | Yeovil | 2024 |
| Abacus the Law C0STS Consultants Limited | Harpenden | 2008 |
| Abacus Time Services Ltd | Wilmslow | 2022 |
| Abacus Training Centre Limited | Stoke-On-Trent | 2011 |
| Abacus Ventures Ltd | Park Row | 2018 |
| Abacus Wealth Limited | Dudley | 2011 |
| Abacus Wills & Trusts Global Limited | High Wycombe | 2019 |
| Abacus Windows and Doors Ltd | Chelmsford | 2001 |
| Abacus WS Holding Company Limited | Kingswinford | 2018 |
| ABACUS4EVER Limited | Weybridge | 2014 |
| Abacusbean Limited | Stockton-On-Tees | 2018 |
| Abacusbean Tax Limited | Stockton-On-Tees | 2021 |
| Abacusbio International Limited | London | 2017 |
| Abacuservices Limited | London | 2025 |
| Abacusonlinesolutions Limited | Romford | 2017 |
| Abad Consultancy Services Limited | Taunton | 2022 |
| Abadriel Clinical Ltd | Harlow, Essex | 2026 |
| Abag Design Studio Limited | London | 2022 |
| Abainbridge Consultants Ltd | Birmingham | 2018 |
| Abajur Ltd | Enfield | 2022 |
| Abakas Services Limited | Woodford Green | 2017 |
| Abakas UK Limited | London | 2024 |
| Abakay Limited | Edgware | 2021 |
| Abakcom Ltd | Manchester | 2013 |
| Abakon Leisure Limited | Dorchester | 1994 |
| Abakos Inc Ltd | London | 2020 |
| Abakus Consulting Limited | London | 2017 |
| Abakus Invest PLC | Egham | 2020 |
| Abakus Management Ltd | Egham | 2017 |
| Abal Cymru Cyfyngedig | Porth Tywyn | 2000 |
| Abal Insight Ltd | Bristol | 2011 |
| Abal International Ltd | Camden Town | 2020 |
| Abal Mckey Limited | Wimborne | 2018 |
| Abaleth Limited | Sevenoaks | 2012 |
| Abalfadhltv | Harrow | 2021 |
| Aball Consulting Ltd | London | 2026 |
| Abalone Consulting Ltd | Brighton | 2018 |
| Abalone Productions Ltd | Exeter | 2013 |
| Abalt Solutions Limited | Aberdeen | 2001 |
| Abaly Ltd | London | 2020 |
| ABAM3D Limited | Wantage | 2021 |
| Abamentis Ltd | Cirencester | 1996 |
| Aban Legal Consultancy Limited | York | 2022 |
| Abande Ltd | London | 2024 |
| Abange Limited | Wolverhampton | 2022 |
| Abante Ltd | London | 2025 |
| Abante Solutions Limited | Reigate | 2007 |
| Abantu Elite Group Ltd | London | 2025 |
| Abaque Services Ltd | London | 2015 |
| Abaqus Limited | Gloucester | 2016 |
| Abar Group Limited | London | 2021 |
| Abarbanel Ltd | London | 2025 |
| Abarchitectural Ltd | Stamford | 2021 |
| Abaris Consulting Limited | Bristol | 2013 |
| Abarlan Limited | London | 2018 |
| Abarno Consulting Ltd | Norwich | 2018 |
| Abas Marketing Ltd | Edinburgh | 2022 |
| Abasi People Forum Ltd | London | 2025 |
| Abasin Linguistic Services Limited | Belfast | 2025 |
| Abass & Co. Accountants and Consult Ltd. | London | 2019 |
| Abass Leisure Limited | Bury St Edmunds | 2013 |
| Abass Studio Limited | Kingston Upon Thames | 2012 |
| Abassido UK Ltd | South Ockendon | 2025 |
| Abastos Consulting Limited | London | 2024 |
| Abat Group Limited | Maguiresbridge | 2025 |
| Abatek Limited | Anlaby | 2024 |
| Abatis Legal Consultants Ltd | Gloucester | 2024 |
| Abatis Safety Services Limited | Spalding | 2002 |
| Abattex Ltd | London | 2014 |
| Abatti.Creative Ltd | Market Deeping | 2026 |
| Abature Ltd | Surrey | 2006 |
| Abavro Ltd | London | 2025 |
| Abax Consultants Limited | Romford | 2025 |
| Abax Holdings Ltd | Newtownstewart | 2016 |
| Abay Solutions Limited | London | 2013 |
| Abaya Klosette Limited | Leicester | 2026 |
| Abaye Management Limited | Stevenage | 2014 |
| ABB Alba & Co Limited | Glasgow | 2024 |
| ABB Consulting - Europe Ltd | Manchester | 2012 |
| ABB Controls Ltd | Cardiff | 2025 |
| ABB Enterprises Limited | Bolton | 2019 |
| ABB Holdings Limited | Warrington | 1994 |
| ABB Innovation Limited | Banff | 2024 |
| ABB Safety Solutions Ltd | Watford | 2016 |
| ABB Technology Management Limited | Alton | 2016 |