| A2M Real Estate Limited | Real estate | 2023 |
| A3BIZSOLUTIONS Ltd | Professional & scientific | 2017 |
| AA Media Horizon Enterprises Ltd | Information & communication | 2026 |
| AA Property Experts Ltd | Real estate | 2025 |
| Aakija Ltd | Information & communication | 2026 |
| Aambee Ltd | Wholesale & retail | 2026 |
| Aasha Holdings Ltd | Financial services | 2026 |
| Aasreya Holdings Ltd | Financial services | 2026 |
| AB Beautiful Life Global Trade Services Limited | Wholesale & retail | 2025 |
| Abacus Global Associates Limited | Professional & scientific | 2021 |
| Abaja Limited | Wholesale & retail | 2025 |
| Abba's Light Childcare Ltd | Education | 2026 |
| Abbas Outlet Limited | Wholesale & retail | 2025 |
| Abbiebmakeup Ltd | Arts & recreation | 2021 |
| Abbily Ltd | Administrative & support | 2019 |
| ABC Drinks Ltd | Wholesale & retail | 2022 |
| ABC Media Standard Ltd. | Professional & scientific | 2025 |
| Abdul-Rahim Holdings Ltd | Information & communication | 2026 |
| Abdulla Innovations Ltd | Wholesale & retail | 2025 |
| Abdullah Farhat Ltd | Wholesale & retail | 2025 |
| Abebech Gebrekidan Holding Limited | Wholesale & retail | 2025 |
| Abeberry Ltd | Wholesale & retail | 2025 |
| Abercrombe Eginton Ltd | Wholesale & retail | 2025 |
| Aberdare Advisors Limited | Professional & scientific | 2025 |
| Ablewight Ltd | Administrative & support | 2011 |
| Aboen Technology Co., Ltd | Wholesale & retail | 2023 |
| Abombay Global Limited | Wholesale & retail | 2024 |
| Aboucompetitions Ltd | Arts & recreation | 2026 |
| Abruv Ltd | Information & communication | 2025 |
| Absinthe Film Entertainment Limited | Information & communication | 2019 |
| Abtonou Ltd | Wholesale & retail | 2025 |
| ABU ALI Yousaf Trading Limited | Wholesale & retail | 2025 |
| Abuai Limited | Transport & logistics | 2025 |
| Abundx UK Ltd | Other services | 2024 |
| AC Industries Co., Ltd | Extraterritorial | 2014 |
| Academy (Asia) Limited | Information & communication | 2021 |
| Acce Commodity Co., Ltd | Administrative & support | 2021 |
| Accelerateher Africa Ltd | Education | 2025 |
| Accelerating Brands Plus Ltd | Professional & scientific | 2025 |
| Acciom Limited | Information & communication | 2019 |
| Account-Angels (North West) Ltd | Professional & scientific | 2011 |
| Accounts & Advice Bureau Ltd | Professional & scientific | 2023 |
| Accounts and Bookkeeping Ltd | Financial services | 2007 |
| Accredex Ltd | Education | 2020 |
| Accretion Accountancy Ltd | Professional & scientific | 2017 |
| Acct Property Group UK Ltd | Construction | 2025 |
| Ace Global Consultancy Group Ltd | Professional & scientific | 2025 |
| Ace Management System Consultants Ltd | Professional & scientific | 2024 |
| Ace Music Booking Agency Limited | Arts & recreation | 2019 |
| Acemastars Ltd | Construction | 2022 |
| Acento Direct Management Limited | Real estate | 2025 |
| Acfe-Uk Ltd | Administrative & support | 2020 |
| Achete Limited | Wholesale & retail | 2021 |
| Ackavira Thank Pages Ltd | Information & communication | 2026 |
| Acme Football Ltd | Arts & recreation | 2021 |
| Aconn Rigging Ltd | Information & communication | 2015 |
| Acorn Social Work Limited | Health & social care | 2020 |
| Acrewood Pets Ltd | Wholesale & retail | 2026 |
| Acro Technology Industry Co., Ltd | Manufacturing | 2015 |
| Across the Pond Media Ltd | Information & communication | 2025 |
| Acrossriver Garment Limited | Administrative & support | 2013 |
| Acrymee Limited | Wholesale & retail | 2025 |
| Acswift Courier Ltd | Transport & logistics | 2026 |
| ACT Abrasives Limited | Administrative & support | 2023 |
| ACT NOW Health Coaching Ltd | Other services | 2023 |
| Actiongo Ltd | Information & communication | 2025 |
| Activex Limited | Wholesale & retail | 2025 |
| Activpoints UK Limited | Information & communication | 2014 |
| Actual Article Ltd | Wholesale & retail | 2026 |
| Actus RE Ltd | Professional & scientific | 2024 |
| Acumen Account Management Ltd | Information & communication | 2025 |
| AD Accounting and Business Solutions Limited | Professional & scientific | 2024 |
| AD Supported Housing Ltd | Real estate | 2025 |
| AD Trading Group Ltd | Manufacturing | 2026 |
| Adam Consultancy Limited | Professional & scientific | 2026 |
| Adam's Group Retail Limited | Wholesale & retail | 2024 |
| ADAM4VENTURES Ltd | Wholesale & retail | 2024 |
| Adams Wellness Ltd | Health & social care | 2024 |
| Adamson Renovations Limited | Construction | 2024 |
| Adapt Automation Ltd | Construction | 2022 |
| Adara Swan CIC | Education | 2025 |
| Addpole Media Ltd | Information & communication | 2024 |
| Adds Technology Consultancy Limited | Information & communication | 2025 |
| ADE Industrial Limited | Professional & scientific | 2019 |
| Adeenus Limited | Information & communication | 2006 |
| Adenzo Sports Ltd | Manufacturing | 2025 |
| Adety Ltd | Wholesale & retail | 2021 |
| Adeum Ltd | Information & communication | 2020 |
| ADG HID Trading Limited | Wholesale & retail | 2025 |
| Adhd & Autism Diagnostic Assessments Ltd | Health & social care | 2026 |
| Adinkra Stories Limited | Manufacturing | 2020 |
| Adlerberg Group Limited | Wholesale & retail | 2025 |
| Adlinx Media Ltd | Professional & scientific | 2023 |
| Adluminex Ltd | Information & communication | 2024 |
| Admin Svcs Ltd | Administrative & support | 2003 |
| ADMIN4YOU Ltd | Professional & scientific | 2011 |
| Adon Technologies Ltd | Wholesale & retail | 2020 |
| Adoptoryn Tool Rollout Ltd | Information & communication | 2026 |
| Adorique Ltd | Wholesale & retail | 2025 |
| Adptv Limited | Information & communication | 2021 |