| Abhashon Limited | Real estate | 2018 |
| Abhi Consulting Ltd | Information & communication | 2017 |
| Abhinav Khatri Films Ltd | Information & communication | 2025 |
| Abhishek Construction Ltd | Construction | 2024 |
| ABI Courier Ltd | Wholesale & retail | 2017 |
| ABI Motors Ltd | Wholesale & retail | 2025 |
| Abigbadamosi Ltd | Other services | 2015 |
| Abigemmanconsult Limited | Information & communication | 2025 |
| Abilux Limited | Wholesale & retail | 2025 |
| Abisara Properties Limited | Real estate | 2022 |
| Abitha Properties Limited | Real estate | 2024 |
| Abivale Limited | Other services | 2019 |
| ABK UK Services Limited | Administrative & support | 2019 |
| Abker Ltd | Wholesale & retail | 2025 |
| ABL Medical Ltd | Health & social care | 2021 |
| Abl(Sl) Ltd | Transport & logistics | 2023 |
| Abla Tech Ltd | Wholesale & retail | 2026 |
| Able Foundation | Health & social care | 2009 |
| Able Lynx Limited | Transport & logistics | 2013 |
| Able Office Technology Limited | Other services | 2009 |
| Abmg Global Limited | Manufacturing | 2022 |
| Abms Property Services Ltd | Real estate | 2024 |
| ABN Invest Ltd | Wholesale & retail | 2020 |
| Abnexia Limited | Wholesale & retail | 2026 |
| ABO Retail Ltd | Wholesale & retail | 2023 |
| Abode London Ltd | Hospitality | 2024 |
| ABR Cart Ltd | Wholesale & retail | 2024 |
| ABR Estates Limited | Real estate | 2022 |
| ABR Motors Ltd | Wholesale & retail | 2025 |
| ABR Wines Limited | Wholesale & retail | 2009 |
| Abraham Finance Limited | Professional & scientific | 2023 |
| Abraham Jacob Limited | Real estate | 2017 |
| Abrar Enterprizes Limited | Wholesale & retail | 2022 |
| Abrar Sahari Parcel Services Ltd | Transport & logistics | 2025 |
| Abridge & Partners Limited | Professional & scientific | 2022 |
| Abridge Commercials Ltd | Wholesale & retail | 2017 |
| Abridge Partners Limited | Professional & scientific | 2026 |
| Abroad S a Limited | Information & communication | 2023 |
| ABS Investments London Ltd | Real estate | 2024 |
| ABS Loftmakers Ltd | Construction | 2024 |
| Absoluetly Markable Ltd | Wholesale & retail | 2024 |
| Absolute Electricians Ltd | Construction | 2018 |
| Absolute Financial Consultants Ltd | Professional & scientific | 2020 |
| Absolute Heating & Building Services Ltd | Construction | 2021 |
| Absolutenoobstudio Limited | Information & communication | 2026 |
| Abstract Office Interiors Limited | Construction | 1996 |
| ABT Cafeteria Ltd | Hospitality | 2019 |
| ABT Finishing Ltd | Construction | 2024 |
| ABT Wood Property Limited | Real estate | 2022 |
| Abtop Joinery Limited | Construction | 2025 |
| Abukar Yusuf Limited | Transport & logistics | 2025 |
| Abux Motors Ltd | Wholesale & retail | 2022 |
| ABY Fast Logistics Limited | Transport & logistics | 2024 |
| ABY Services London Ltd | Construction | 2021 |
| ABZ Cars & Couriers Ltd | Transport & logistics | 2020 |
| ABZ Mart Ltd | Wholesale & retail | 2025 |
| ABZ Stars London Ltd | Manufacturing | 2022 |
| Abzs Foods Ltd | Hospitality | 2025 |
| AC Dragon Air Conditioning Ltd | Construction | 2022 |
| AC London Communications Ltd | Information & communication | 2025 |
| AC Studios Group Ltd | Information & communication | 2026 |
| AC Taverns Crewe Ltd | Hospitality | 2019 |
| AC3 Marketing Ltd | Professional & scientific | 2026 |
| ACA Roofing Limited | Construction | 1999 |
| Acacia Alpha Ltd | Real estate | 2024 |
| Academia Educare UK Ltd | Education | 2020 |
| Academia Pathways Ltd | Education | 2024 |
| Academic Assist Limited | Education | 2024 |
| Academix Training Ltd | Administrative & support | 2022 |
| Academy Food Imports Ltd | Wholesale & retail | 2019 |
| Acasa Delicatessen Ltd | Hospitality | 2015 |
| ACC Crunchers Ltd | Administrative & support | 2023 |
| Acceleron Ventures Ltd | Wholesale & retail | 2026 |
| Accendis Limited | Information & communication | 2010 |
| Access Construct Ltd | Construction | 2023 |
| Access Construction Services Ltd | Administrative & support | 2018 |
| Access Living Limited | Health & social care | 2007 |
| Accesscare Ltd | Health & social care | 2016 |
| Accessory Wise Limited | Wholesale & retail | 2020 |
| Accident Victims Helpline Ltd | Administrative & support | 2006 |
| Acclaim Marquees Limited | Administrative & support | 2011 |
| Acco Books Limited | Professional & scientific | 2022 |
| Acco Estates Ltd | Real estate | 2023 |
| Accord Accounting Associates Ltd | Professional & scientific | 2011 |
| Accord Consultancy Services Ltd | Professional & scientific | 2024 |
| Account Associate Ltd | Professional & scientific | 2017 |
| Account Fast Ltd | Other services | 2019 |
| Accountability PT Limited | Arts & recreation | 2026 |
| Accountancy Solutions (LHR) Ltd | Information & communication | 2023 |
| Accountancy Specialist Limited | Professional & scientific | 2020 |
| Accountants Vision Ltd | Professional & scientific | 2015 |
| Accountax Consultants UK Limited | Professional & scientific | 2004 |
| Accountax Practice Ltd | Information & communication | 2014 |
| Accountax Pro Ltd | Professional & scientific | 2012 |
| Accounting Services Group PVT Ltd | Professional & scientific | 2017 |
| Accounting Solutions Group Ltd | Professional & scientific | 2018 |
| Accountix Ltd | Professional & scientific | 2022 |
| Accountizm Limited | Professional & scientific | 2024 |
| Accountorium Limited | Professional & scientific | 2017 |
| Accountrivia Limited | Professional & scientific | 2023 |