| A2Z MOT Station Ltd | Wholesale & retail | 2024 |
| A2Z Premium Services Ltd | Other services | 2025 |
| A3 Consultancy Ltd | Professional & scientific | 2022 |
| A3 Investments Limited | Real estate | 2022 |
| A4 INV Limited | Real estate | 2023 |
| A40 Bathrooms and Kitchens Ltd | Construction | 2022 |
| A6 Investment Limited | Real estate | 2021 |
| A7 Investments Limited | Real estate | 2017 |
| A8 Investments Limited | Real estate | 2021 |
| AA Dream Construction Ltd | Construction | 2018 |
| AA Engineering Consultancy Ltd | Wholesale & retail | 2015 |
| AA Products Ltd | Wholesale & retail | 2013 |
| AA Zindagi Trading Ltd | Wholesale & retail | 2026 |
| AAA Actuarial Services Ltd | Professional & scientific | 2022 |
| AAA Airport Cars Limited | Transport & logistics | 2025 |
| Aaa&R Ltd | Hospitality | 2026 |
| Aaarconstruction Ltd | Construction | 2025 |
| Aadev Ltd | Real estate | 2025 |
| Aadi Property Solutions Ltd | Real estate | 2025 |
| AAE Everything AO Ltd | Information & communication | 2025 |
| Aahlee International Ltd | Real estate | 2023 |
| AAL Properties Limited | Real estate | 2021 |
| AAM Morina Ltd | Construction | 2024 |
| AAN Enterprises Ltd | Wholesale & retail | 2013 |
| AAR Aesthetics Limited | Health & social care | 2021 |
| Aarav Camberley Ltd | Real estate | 2021 |
| Aarmish Estate Limited | Real estate | 2026 |
| Aarshiv Ventures Ltd | Real estate | 2025 |
| Aarvee Smiles Limited | Manufacturing | 2019 |
| Aaryan Investment Holdings Limited | Real estate | 2024 |
| Aaryana Limited | Extraterritorial | 2022 |
| Aashvi Beautycare Ltd | Other services | 2024 |
| Aavtar Ltd | Real estate | 2025 |
| Aayu Wellness Ltd | Information & communication | 2026 |
| AAZ Driving School Ltd | Education | 2020 |
| Aazconstruction Ltd | Construction | 2022 |
| AB & CB Property Limited | Real estate | 2024 |
| AB and MB Developments Limited | Construction | 2015 |
| AB Cleaning Solutions Limited | Administrative & support | 2025 |
| AB Global Sports Ltd | Professional & scientific | 2025 |
| AB Nail Salon Limited | Other services | 2024 |
| AB Remedy Limited | Professional & scientific | 2023 |
| Ab-Ab Construction Ltd | Construction | 2023 |
| Abacus Tech Solutions Limited | Information & communication | 2008 |
| Abba Designs Ltd | Professional & scientific | 2023 |
| Abber Limited | Real estate | 2019 |
| Abbey View Management Company Limited | Real estate | 1989 |
| Abbots March Limited | Information & communication | 2022 |
| Abbots Wood Management (Sevenoaks) Limited | Real estate | 1986 |
| ABC Food Market Ltd | Information & communication | 2013 |
| ABE Hospitality Limited | Hospitality | 2026 |
| Abfn Ltd | Wholesale & retail | 2025 |
| Abhi-Tech Limited | Information & communication | 2022 |
| Abhinavagupta Centre for Advanced Studies Ltd | Education | 2024 |
| Abhl Limited | Wholesale & retail | 2022 |
| Abiaf Ltd | Health & social care | 2023 |
| Abie Trading Ltd | Wholesale & retail | 2013 |
| Abilite Solutions Ltd | Information & communication | 2023 |
| ABN Property Management Limited | Real estate | 2020 |
| Above & Beyond Consulting Limited | Information & communication | 2024 |
| Abrish Global Ltd | Wholesale & retail | 2025 |
| Absee Ltd | Education | 2021 |
| Abshar Banqueting 2 Ltd | Hospitality | 2019 |
| Abshar Banqueting Limited | Hospitality | 2015 |
| Absolute Building Control Limited | Energy | 2013 |
| Absolute Catering and Refrigeration Ltd | Manufacturing | 2025 |
| Absolute Property Maintenance Ltd | Households | 2023 |
| Absolute Scenes Ltd | Information & communication | 2017 |
| ABT Europe Ltd | Wholesale & retail | 2020 |
| AC Design Solutions Ltd | Professional & scientific | 2012 |
| AC Meat & Fish Ltd | Wholesale & retail | 2023 |
| AC Mediatech Limited | Information & communication | 2023 |
| AC1 Investments Ltd | Real estate | 2024 |
| Academic Research Benchmarking Ltd | Education | 2023 |
| Accelerate Financial Services Ltd. | Financial services | 2023 |
| Accelerate in Automotive CIC | Education | 2022 |
| Accelright Limited | Information & communication | 2010 |
| Acclaim Services Ltd | Water & waste | 2025 |
| Accountability Outsourced Support Limited | Professional & scientific | 2009 |
| Accountancy Tax Direct Limited | Professional & scientific | 2004 |
| Accountingaid Limited | Financial services | 2025 |
| Accsen Consultancy (UK) Limited | Information & communication | 2012 |
| Acctax Direct LLP | | 2013 |
| Accurist Ltd | Professional & scientific | 2024 |
| Ace Detailing Ltd | Real estate | 2023 |
| Ace Grab Hire and Haulage Limited | Transport & logistics | 2013 |
| Ace Laboratories Limited | Professional & scientific | 2013 |
| Ace Learning Skills Ltd | Education | 2022 |
| Ace Marine Engineering Ltd | Manufacturing | 2025 |
| Ace Pest Ltd | Agriculture & fishing | 2014 |
| ACG Holdings & Investments Ltd | Professional & scientific | 2022 |
| ACK Properties Limited | Real estate | 2011 |
| Acon Interiors Ltd | Construction | 2016 |
| Acorn Business Machines (Holmfirth) Ltd | Manufacturing | 2007 |
| ACR Manpower Limited | Construction | 2017 |
| Acre House Management Limited | Households | 1986 |
| Acrux Property Limited | Real estate | 2019 |
| ACS Automotive Ltd | Wholesale & retail | 2025 |
| ACS Autowerks Limited | Other services | 2006 |
| Action Space Bar Limited | Hospitality | 2024 |