| Abbey Shield Limited | Professional & scientific | 2019 |
| Abbie Construction Ltd | Construction | 2017 |
| Abbm Group Ltd | Hospitality | 2025 |
| Abbott Sanag (UK) Group Co Ltd | Extraterritorial | 2019 |
| Abbotts Drive 1968 Limited | Extraterritorial | 2015 |
| Abbotts Place Ltd | Real estate | 2026 |
| Abby Designs Ltd | Wholesale & retail | 2022 |
| ABC Equity Limited | Construction | 2019 |
| Abdeenly Ltd | Wholesale & retail | 2026 |
| Abeeha Car Hire Ltd | Other services | 2017 |
| Abel Commercial Ltd | Financial services | 2025 |
| Abel Management Ltd | Real estate | 2016 |
| Abel Photo Specialist Ltd | Administrative & support | 2006 |
| Abington Fish Bar Limited | Hospitality | 2019 |
| Abira Properties Limited | Real estate | 2024 |
| Abira Trading Ltd | Wholesale & retail | 2022 |
| Able AI Strategy Ltd | Information & communication | 2026 |
| Able Clothing Ltd | Wholesale & retail | 2021 |
| Abnormal Media Ltd | Professional & scientific | 2024 |
| Abokesh Ltd | Construction | 2014 |
| Above and Beyond Construction Ltd | Construction | 2010 |
| Above Clouds Studio Ltd | Information & communication | 2025 |
| Aboyne Groceries Ltd | Wholesale & retail | 2022 |
| ABP Clinic Limited | Health & social care | 2023 |
| ABR International Ltd | Manufacturing | 2021 |
| Abraham Automotive Ltd | Wholesale & retail | 2026 |
| Absolute Construction Planning Ltd | Construction | 2024 |
| Absolute Services Construction Ltd | Construction | 2026 |
| Abssm Ltd | Professional & scientific | 2026 |
| ABT Consultation Ltd | Health & social care | 2023 |
| ABX Properties Limited | Real estate | 2017 |
| ABZ Finds Ltd | Wholesale & retail | 2025 |
| Abzay Properties Ltd | Real estate | 2025 |
| AC Construction Ltd | Construction | 2019 |
| AC Contractors Limited | Construction | 2005 |
| AC Utility Limited | Construction | 2014 |
| Academic Partners Limited | Education | 2018 |
| Academy of Soft & Hard Tissue Augmentation Ltd | Health & social care | 2021 |
| Acatrinei Limited | Transport & logistics | 2018 |
| Accelerate Couriers Ltd | Transport & logistics | 2025 |
| Accelerating Potential Ltd | Professional & scientific | 2013 |
| Access Accounting Services Limited | Professional & scientific | 1993 |
| Access Long Hair (UK) Ltd | Wholesale & retail | 2024 |
| Accident Management Service Limited | Other services | 2009 |
| Accident Storage & Recovery Ltd | Transport & logistics | 2018 |
| Accion Limited | Manufacturing | 2019 |
| Account Logic Ltd | Professional & scientific | 2008 |
| Account Settlements Ltd | Professional & scientific | 2026 |
| Accountancy Hub Limited | Professional & scientific | 2008 |
| Accruna Ltd | Information & communication | 2025 |
| Accurate Professional Limited | Construction | 2011 |
| Ace Building Services Engineering Ltd | Administrative & support | 2017 |
| Ace Clothing Company Ltd | Wholesale & retail | 2025 |
| Ace Medical Education Limited | Education | 2020 |
| Ace Practice Management Ltd | Other services | 2012 |
| Acedean Limited | Real estate | 2011 |
| Acehug Ltd | Professional & scientific | 2021 |
| Acepower Recruitment PVT Ltd | Administrative & support | 2024 |
| Aceprosoft Solutions Limited | Information & communication | 2009 |
| Acesirofficial Ltd | Wholesale & retail | 2020 |
| Achieve School of Motoring Ltd | Education | 2017 |
| Achievers Education Ltd | Education | 2024 |
| ACI Services Ltd | Wholesale & retail | 2025 |
| Ackley MA LEE & Co Ltd | Professional & scientific | 2019 |
| Acorn Technology and Services Limited | Information & communication | 2024 |
| ACP Enterprise Ltd | Administrative & support | 2012 |
| ACR & ARL Real Estate Consultancy Ltd | Real estate | 2015 |
| ACR Car Repair Ltd | Administrative & support | 2016 |
| Acredart Limited | Real estate | 1984 |
| ACS Asset Management Ltd | Real estate | 2023 |
| ACS Professionals in Construction Limited | Construction | 1986 |
| ACS Property Investments Limited | Professional & scientific | 1999 |
| Action 4 Kids C.I.C. | Education | 2025 |
| Action Breaks Silence Ltd | Health & social care | 2013 |
| Action Potential Tech Ltd | Administrative & support | 2013 |
| Action Results Limited | Professional & scientific | 2013 |
| Active Care & Support Ltd | Health & social care | 2003 |
| Active Guard Security Limited | Administrative & support | 2012 |
| Active Mobile Tyre Ltd | Other services | 2021 |
| Active Residence Limited | Real estate | 2025 |
| Active Response 247 Ltd | Construction | 2025 |
| Activetime Children's Activities Daynursery Ltd | Education | 2018 |
| Activetime Day Nursery Kenton Ltd | Health & social care | 2024 |
| Acuwellness Ltd | Other services | 2013 |
| AD & V Ltd | Other services | 2014 |
| AD Agency Directory Limited | Professional & scientific | 2024 |
| AD Astra Creative Arts Ltd | Administrative & support | 2025 |
| AD Cargo Limited | Transport & logistics | 2025 |
| AD Commercials Ltd | Construction | 2026 |
| AD Infinitum Health Ltd | Health & social care | 2022 |
| AD Wholesale Group Limited | Wholesale & retail | 2026 |
| ADA Interiors Ltd | Construction | 2025 |
| Adaj Limited | Real estate | 2021 |
| Adam & AAA Ltd | Transport & logistics | 2025 |
| Adam and Angel Fashion Ltd | Wholesale & retail | 2025 |
| Adam Kino Limited | Information & communication | 2026 |
| Adam Property Services Ltd | Households | 2018 |
| Adams Investments & Developments Ltd | Real estate | 2025 |
| Adams Pizza & Grill Limited | Hospitality | 2022 |
| Adams Transportation Ltd | Transport & logistics | 2022 |