| ABACHA575 Services Limited | Construction | 2014 |
| Abaci Catering Ltd | Hospitality | 2018 |
| Abaci Online Ltd | Wholesale & retail | 2017 |
| Abaci Payments Ltd | Professional & scientific | 2013 |
| Abacigil Family Estates Limited | Real estate | 2025 |
| Abacium Group Ltd | Professional & scientific | 2025 |
| Abaco A.M. Limited | Professional & scientific | 2016 |
| Abaco Consulting Ltd | Professional & scientific | 2022 |
| Abaco Films Ltd | Information & communication | 2017 |
| Abaco Global Resources Ltd | Mining & quarrying | 2017 |
| Abaco Insurance Brokers Limited | Financial services | 2011 |
| Abaco International Loss Adjusters UK Ltd | Administrative & support | 2015 |
| Abaco Marea Ltd | Construction | 2017 |
| Abaco Recruitment Limited | Administrative & support | 2009 |
| Abaco(Uk) Limited | Information & communication | 2022 |
| Abaconsultantlondon Ltd | Education | 2023 |
| Abacus & Azure Ltd | Professional & scientific | 2014 |
| Abacus - AB Building Services Limited | Administrative & support | 2005 |
| Abacus Account Solutions Ltd | Professional & scientific | 2025 |
| Abacus Accountancy (LDN) Ltd | Professional & scientific | 2009 |
| Abacus Accountancy UK Ltd | Professional & scientific | 2007 |
| Abacus Accounting Technicians Limited | Professional & scientific | 1999 |
| Abacus Agent Accounting Ltd | Professional & scientific | 2016 |
| Abacus Analysis Limited | Information & communication | 1996 |
| Abacus Analytics Ltd | Information & communication | 2010 |
| Abacus ARK Holdings Ltd | Education | 2024 |
| Abacus ARK Ltd | Education | 2012 |
| Abacus ARK Property Limited | Real estate | 2026 |
| Abacus ARK2 Limited | Education | 2014 |
| Abacus Arkadia Limited | Arts & recreation | 2025 |
| Abacus Asset Investments Ltd | Real estate | 2021 |
| Abacus Assets Limited | Real estate | 2024 |
| Abacus Azure Ltd | Professional & scientific | 2010 |
| Abacus Bureau Investments Ltd | Financial services | 2011 |
| Abacus Bureau Limited | Professional & scientific | 2008 |
| Abacus Cambridge Partners Limited | Information & communication | 2017 |
| Abacus CFN Solution Ltd | Administrative & support | 2026 |
| Abacus Claims Ltd | Professional & scientific | 2025 |
| Abacus Consulting Europe Ltd | Professional & scientific | 2006 |
| Abacus Consulting Services Limited | Other services | 2006 |
| Abacus Contracts Limited | Professional & scientific | 2009 |
| Abacus Corporation Limited | Administrative & support | 1993 |
| Abacus Customs Ltd | Professional & scientific | 2011 |
| Abacus Digital Advisory Ltd | Professional & scientific | 2017 |
| Abacus Digital Limited | Information & communication | 2016 |
| Abacus Education Group Ltd | Education | 2026 |
| Abacus Energy Enterprises Limited | Administrative & support | 2019 |
| Abacus Estates (Harrow) Limited | Real estate | 2023 |
| Abacus Estates (Highgate) Limited | Real estate | 2026 |
| Abacus Estates (Holdings) Limited | Real estate | 2026 |
| Abacus Gems Jewellery Limited | Manufacturing | 2022 |
| Abacus Homes 24 Limited | Construction | 2025 |
| Abacus Homes Construction 24 Limited | Construction | 2026 |
| Abacus Horizons (UK) Limited | Administrative & support | 1999 |
| Abacus House Clearance Ltd | Water & waste | 2021 |
| Abacus Ideas Ltd | Professional & scientific | 2020 |
| Abacus Inc Ltd | Construction | 2022 |
| Abacus Information Technology UK Limited | Information & communication | 2013 |
| Abacus Installations Ltd | Administrative & support | 2024 |
| Abacus IT Consulting Ltd | Information & communication | 2025 |
| Abacus Land ASP 1 Limited | Extraterritorial | 2022 |
| Abacus Land ASP 2 Limited | Extraterritorial | 2022 |
| Abacus Lease Investment Limited | Administrative & support | 2015 |
| Abacus Markets Limited | Financial services | 2019 |
| Abacus Micro Limited | Construction | 2016 |
| Abacus Nominees Limited | Professional & scientific | 1984 |
| Abacus Paper Products Limited | | 1986 |
| Abacus Partners (LDN) LLP | | 2010 |
| Abacus Partners II Limited | Financial services | 2015 |
| Abacus Partners Ltd | Professional & scientific | 2018 |
| Abacus PM Ltd | Professional & scientific | 2023 |
| Abacus Printing Company Limited | Manufacturing | 1969 |
| Abacus Properties Limited | Real estate | 2005 |
| Abacus Residential Limited | Real estate | 2004 |
| Abacus Resource Solutions Limited | Professional & scientific | 2015 |
| Abacus Restoration Ltd | Manufacturing | 2024 |
| Abacus Results Limited | Administrative & support | 2025 |
| Abacus Skunkworks Limited | Information & communication | 2024 |
| Abacus Soft Limited | Information & communication | 2017 |
| Abacus Software Limited | Information & communication | 1997 |
| Abacus Sport & Golf UK Ltd | Wholesale & retail | 2009 |
| Abacus Support Ltd | Administrative & support | 2022 |
| Abacus Systems (UK) Limited | Information & communication | 2006 |
| Abacus Technologies and Software Ltd | Information & communication | 2025 |
| Abacus Technology Limited | Information & communication | 2018 |
| Abacus Trading Co. Limited | Extraterritorial | 2016 |
| Abacus Transport (South East) Limited | Transport & logistics | 2016 |
| Abacus Tutoring Services Limited | Other services | 2014 |
| Abacus Video Limited | Information & communication | 1982 |
| Abacus Wandsworth Common Ltd | Education | 2024 |
| ABACUS24 Limited | Administrative & support | 2016 |
| ABACUS6IX Limited | Manufacturing | 2022 |
| ABACUSARK3 Limited | Health & social care | 2022 |
| Abacusbio International Limited | Professional & scientific | 2017 |
| Abacuservices Limited | Professional & scientific | 2025 |
| Abacuzz Group Limited | Transport & logistics | 2015 |
| Abad Designs Ltd | Manufacturing | 2019 |
| Abada Wellness Ltd | Information & communication | 2018 |
| Abadan BM Ltd | Other services | 2026 |
| Abadan.Lv Ltd | Health & social care | 2015 |