| Ability Hotels (Edinburgh) Number 1 Limited | Financial services | 2019 |
| Ability Hotels (Edinburgh) Number 2 Limited | Financial services | 2019 |
| Ability Hotels (Glasgow) Limited | Real estate | 2007 |
| Ability Hotels (III) Group Limited | Financial services | 2014 |
| Ability Hotels (III) Holdings Limited | Financial services | 2014 |
| Ability Hotels (III) UK Limited | Financial services | 2014 |
| Ability Hotels (IV) Finance B Limited | Administrative & support | 2019 |
| Ability Hotels (IV) Finance Limited | Financial services | 2014 |
| Ability Hotels (IV) Group Limited | Financial services | 2014 |
| Ability Hotels (IV) Holdings B Limited | Financial services | 2019 |
| Ability Hotels (IV) Holdings Limited | Financial services | 2014 |
| Ability Hotels (IV) UK B Limited | Administrative & support | 2019 |
| Ability Hotels (IV) UK Limited | Financial services | 2014 |
| Ability Hotels (Manchester) Holdings Limited | Financial services | 2014 |
| Ability Hotels (Manchester) Limited | Real estate | 2014 |
| Ability Hotels (Newcastle) Holdings Limited | Financial services | 2014 |
| Ability Hotels (Newcastle) Limited | Real estate | 2014 |
| Ability Hotels (Peterborough) Holdings Limited | Financial services | 2014 |
| Ability Hotels (Peterborough) Limited | Hospitality | 2014 |
| Ability Hotels (Southport) Holdings Limited | Financial services | 2014 |
| Ability Hotels (Southport) Limited | Real estate | 2014 |
| Ability Hotels (V) Finance Limited | Financial services | 2016 |
| Ability Hotels (V) Group Limited | Financial services | 2016 |
| Ability Hotels (V) Holdings Limited | Financial services | 2016 |
| Ability Hotels (V) UK Limited | Financial services | 2016 |
| Abormic Services Limited | Wholesale & retail | 2023 |
| Abri Energy Ltd | Manufacturing | 2026 |
| Absolutely Spotless Limited | Other services | 1997 |
| Academy of Business and Technology UK Limited | Education | 2022 |
| Academy of Digital Industries Ltd | Education | 2022 |
| ACCELER8 Agile Limited | Information & communication | 2021 |
| Accessories Nationwide Ltd | Wholesale & retail | 2025 |
| Accountancy Back Office Limited | Professional & scientific | 2022 |
| Accountants for Ecommerce Limited | Professional & scientific | 2021 |
| Accounting One Ltd | Professional & scientific | 2018 |
| Accountique Ltd | Professional & scientific | 2020 |
| Accounts & Finance Consultants Ltd | Professional & scientific | 2011 |
| Accouting Limited | Information & communication | 2020 |
| Acctech Consulting Limited | Professional & scientific | 2009 |
| Acctech Professionals Limited | Professional & scientific | 2007 |
| Ace Cargo Clearance Ltd | Transport & logistics | 2024 |
| Acmet UK Ltd | Education | 2022 |
| Acorn Games Limited | Information & communication | 2017 |
| Action Commercial Interiors Ltd | Construction | 2018 |
| Active Mums Ltd | Arts & recreation | 2021 |
| Acucare Systems Ltd | Information & communication | 2025 |
| Acucarex Ltd | Information & communication | 2025 |
| AD Limina Limited | Professional & scientific | 2023 |
| Addedme Ltd | Information & communication | 2022 |
| Addison Giles Limited | Real estate | 2013 |
| Addo Design Ltd | Professional & scientific | 2012 |
| Adelaide Homes Limited | Real estate | 2024 |
| Adelaide Terrace NO 18 Limited | Households | 2014 |
| Aden Chagall Limited | Wholesale & retail | 2019 |
| Adept Inventories Limited | Households | 2025 |
| Adikam Ltd | Wholesale & retail | 2024 |
| Admirable Care Ltd | Administrative & support | 2020 |
| Adnan ALI Advisory Ltd | Professional & scientific | 2025 |
| Adoxa Ecology Ltd | Professional & scientific | 2025 |
| Adrem International Ltd | Real estate | 2021 |
| Adrian Mircea Ltd | Manufacturing | 2019 |
| ADV Coaching LLP | | 2025 |
| Advance College of Business and Technology Limited | Education | 2023 |
| Advanced Marketing Group Ltd | Information & communication | 2023 |
| Adveed Ltd. | Information & communication | 2017 |
| AE Bakery Holdings Limited | Construction | 2020 |
| AE Bakery Limited | Manufacturing | 2020 |
| AEB Financial Limited | Financial services | 2025 |
| Aequitas Medicolegal Ltd | Health & social care | 2024 |
| AER Technology Limited | Information & communication | 2018 |
| Aevitas IT Limited | Information & communication | 2021 |
| AFA Electric Ltd | Construction | 2021 |
| Afidia Group Ltd | Real estate | 2026 |
| Afrikan Combined Ltd. | Hospitality | 2015 |
| AG Sourcing [UK] Limited | Wholesale & retail | 2024 |
| AGENCY34 Ltd | Professional & scientific | 2016 |
| Agile and IT Digital Services Limited | Information & communication | 2021 |
| Agile Wings Limited | Information & communication | 2023 |
| Agiletrics Ltd | Information & communication | 2019 |
| Agilistic Limited | Information & communication | 2015 |
| AGP Accountants Ltd | Professional & scientific | 2014 |
| AGP Audit Ltd | Professional & scientific | 2024 |
| AGP Partnership LLP | | 2020 |
| Agrimar (U.K.) Limited | Agriculture & fishing | 1981 |
| Agro Afriq Investments Ltd | Agriculture & fishing | 2025 |
| AHK Green Olives Ltd | Hospitality | 2023 |
| Ahmed Group of Partnerships Ltd | Financial services | 2022 |
| Ahmed Portfolio Ltd | Real estate | 2020 |
| AI Call Agent Limited | Information & communication | 2026 |
| AID Movie Ltd | Information & communication | 2025 |
| AIG + Partners Ltd | Construction | 2019 |
| Air Galaxy Limited | Administrative & support | 2020 |
| Airfare Services Limited | Administrative & support | 2023 |
| Aironteam Ltd | Construction | 2020 |
| Airport and City Chauffeurs Ltd | Transport & logistics | 2018 |
| Airtask Ltd | Manufacturing | 2018 |
| Airwave Audio and Vision Ltd | Information & communication | 2012 |
| AJ Capital Ventures Limited | Financial services | 2023 |
| AJ Investo Ltd | Real estate | 2017 |
| AJ LUX Builders Ltd | Construction | 2023 |