| A Life More Mindful Ltd | Professional & scientific | 2018 |
| A M Dental Care Limited | Health & social care | 2009 |
| A M Popescu Accountancy Ltd | Professional & scientific | 2014 |
| A N K Print Limited | Professional & scientific | 2014 |
| A P Letting & Properties Management Services Ltd | Real estate | 2019 |
| A S Daniel Ltd | Real estate | 2022 |
| A S Integration Ltd | Information & communication | 2005 |
| A Star Improvements Ltd | Construction | 2020 |
| A Time of Monsters Limited | Information & communication | 2020 |
| A Time of Monsters Production Limited | Arts & recreation | 2021 |
| A to Z Construction Solutions Limited | Construction | 2012 |
| A to Z London Services Ltd | Real estate | 2023 |
| A V Bodyworks Limited | Wholesale & retail | 2009 |
| A&A Professional Consulting Limited | Education | 2017 |
| A&B Build Ltd | Construction | 2017 |
| A&C Business Consultants Limited | Professional & scientific | 2019 |
| A&C Food & VEG Limited | Wholesale & retail | 2024 |
| A&C Logistik Ltd | Manufacturing | 2022 |
| A&E Property Care and Solutions Ltd | Real estate | 2022 |
| A&G Roofing and Building Ltd | Construction | 2021 |
| A&G Roofing Construction Ltd | Construction | 2023 |
| A&J Construction Ltd | Construction | 2012 |
| A&L Finishing Ltd | Construction | 2018 |
| A&M Holisticretailshop Limited | Wholesale & retail | 2008 |
| A&N Swift Services Ltd | Transport & logistics | 2026 |
| A&R Recruitment Ltd | Wholesale & retail | 2022 |
| A&R&S Ltd | Construction | 2024 |
| A&S 1984 Limited | Transport & logistics | 2025 |
| A&S Building and Maintenance Ltd | Other services | 2019 |
| A&S Dental Ltd | Health & social care | 2014 |
| A&S Rendering Limited | Construction | 2018 |
| A'S Lawns Limited | Administrative & support | 2019 |
| A+ Heating and Plumbing Ltd | Wholesale & retail | 2007 |
| A-Cross Music Ltd | Education | 2014 |
| A-M.Yoga Ltd | Arts & recreation | 2008 |
| A-Z Prestige Limited | Other services | 2019 |
| A. C. Nunney (Properties) Limited | Real estate | 1962 |
| A. P. Imaging Limited | Wholesale & retail | 2012 |
| A. V. Specialised Properties Limited | Real estate | 2004 |
| A.A. Lettings Ltd. | Real estate | 1993 |
| A.B Grand Estates Ltd | Real estate | 2025 |
| A.B. Davis Limited | Wholesale & retail | 1977 |
| A.B.S Basement Systems Limited | Construction | 2024 |
| A.B.S. Property Care Limited | Construction | 2014 |
| A.C.E Multi CIC | Education | 2024 |
| A.Gupta & Co. (Acca) Ltd | Other services | 2019 |
| A.I.W Consultancy Limited | Professional & scientific | 2016 |
| A.I.W. Investment Limited | Real estate | 2020 |
| A.J.D. Watches & Jewellery Limited | Wholesale & retail | 2015 |
| A.Kryeziu Builders Ltd | Construction | 2022 |
| A.N.A Homes & Lettings Ltd | Real estate | 2025 |
| A.N.K. Limited | Construction | 1999 |
| A.R.F Advisory Ltd | Professional & scientific | 2025 |
| A.T.E. Data Limited | Information & communication | 1988 |
| A1 Builders & Constructors Limited | Construction | 2019 |
| A1 Building Supplies U.K. Limited | Wholesale & retail | 2006 |
| A1 Decor Limited | Construction | 2017 |
| A1 Property (London) Ltd | Real estate | 2015 |
| A1TEC Solutions Ltd | Professional & scientific | 2023 |
| A2H2 Properties Limited | Real estate | 2019 |
| A2Z VIP Services Ltd | Wholesale & retail | 2023 |
| AA Foods Online Limited | Hospitality | 2024 |
| AA Motoring School Ltd | Education | 2025 |
| AA Motors London Ltd | Wholesale & retail | 2025 |
| AA Online Investments Ltd | Wholesale & retail | 2026 |
| AAA Pressure Cleaning Ltd | Administrative & support | 2026 |
| AAB Media Limited | Information & communication | 2018 |
| AAH ENT Ltd | Health & social care | 2024 |
| Aang Innoveng UK Limited | Wholesale & retail | 2018 |
| Aarav Housing Ltd | Real estate | 2018 |
| Aarav Supported Living Limited | Health & social care | 2024 |
| Aari Tamil Ltd | Wholesale & retail | 2025 |
| Aarinya Limited | Wholesale & retail | 2026 |
| Aarm Property Limited | Real estate | 2021 |
| Aarya Children Homes Limited | Health & social care | 2024 |
| Aarya New Homes Limited | Real estate | 2024 |
| Aarya North Drive Property Ltd | Real estate | 2023 |
| Aaryama Ltd | Real estate | 2026 |
| Aaryan Home Lettings Limited | Real estate | 2024 |
| Aayu Centre Ltd | Wholesale & retail | 2025 |
| AAZ Limited | Wholesale & retail | 2013 |
| AB Plumbing & GAS Ltd | Construction | 2012 |
| AB & C Cleaning Services Ltd | Administrative & support | 2023 |
| AB Moves Ltd | Transport & logistics | 2026 |
| Abakay Limited | Professional & scientific | 2021 |
| Abalane Limited | Real estate | 1982 |
| Abargain Limited | Administrative & support | 2012 |
| Abbas Versi Limited | Information & communication | 2022 |
| Abbeyfields (Barking) Management Company Limited | Households | 2002 |
| Abbotsford 1 Limited | Other services | 2021 |
| Abby Construction Limited | Construction | 2026 |
| ABC Buildcon Limited | Construction | 2022 |
| ABC Edit Ltd | Information & communication | 2024 |
| ABC Estates Limited | Extraterritorial | 2016 |
| ABC Estates Sales Limited | Real estate | 2014 |
| ABC Estates Surveyors Ltd | Administrative & support | 2019 |
| ABC II (Services) Limited | Administrative & support | 2013 |
| ABC III (Group) Limited | Financial services | 2014 |
| ABC Kidz Nurseries Ltd | Health & social care | 2017 |
| ABC Nursery Milk Ltd | Administrative & support | 2020 |