| 08152856 Limited | Real estate | 2012 |
| 1 HSB Limited | Real estate | 2025 |
| 1 MSB Limited | Real estate | 2024 |
| 11 KSB Limited | Real estate | 2020 |
| 11 MSB Limited | Real estate | 2024 |
| 16 Leys Avenue Limited | Real estate | 2024 |
| 18K Sports Limited | Professional & scientific | 2018 |
| 27 Crawley Road Limited | Real estate | 2024 |
| 2ND Greenacres Management Company Limited | Real estate | 1983 |
| 3 Spice Delivery Ltd | Hospitality | 2024 |
| 365 Aerospace Design (UK) Limited | Professional & scientific | 2019 |
| 365 Aerospace Ltd | Professional & scientific | 2014 |
| 3BIM Engineering Ltd | Professional & scientific | 2025 |
| 3KS GE Specialists Limited | Administrative & support | 2010 |
| 3RD Greenacres Management Company Limited | Real estate | 1997 |
| 4-9 Harvington Park (Management) Limited | Administrative & support | 2004 |
| 4M Square Ltd | Hospitality | 2026 |
| 523 Finchley Road Management Company Limited | Households | 2007 |
| 55 Exec Search Limited | Administrative & support | 2022 |
| 5AB Care Ltd | Health & social care | 2018 |
| 5AB Holdings Limited | Financial services | 2022 |
| 5AB Leasing Limited | Real estate | 2023 |
| 5AB Properties Limited | Real estate | 2020 |
| 60 Road Studios Limited | Information & communication | 2014 |
| 7 Baas Limited | Financial services | 2024 |
| 8-10 High Street Dartford Limited | Real estate | 2023 |
| 99 Rylston RD Management Company Ltd | Households | 2010 |
| A & S Consulting Limited | Information & communication | 1998 |
| A & T Ventilation Ltd | Other services | 2019 |
| A J Cook Builders (Herts) Ltd | Construction | 2019 |
| A. & E. Sharpe Properties Limited | Real estate | 1959 |
| A.S.A.P Steel Fabrications Ltd | Manufacturing | 2019 |
| Aalberts Surface Technologies Heat Limited | Manufacturing | 1966 |
| AAM Client Solutions Ltd | Professional & scientific | 2016 |
| Abinaas Limited | Financial services | 2018 |
| Abiola Ltd | Administrative & support | 2017 |
| ABN Property Solutions Ltd | Real estate | 2025 |
| Absolute Fitters Limited | Construction | 2018 |
| AC Developers Co LLP | | 2026 |
| AC Services (England) Limited | Manufacturing | 2006 |
| Ac&Dc Electrical Ltd | Construction | 2023 |
| ACA Solutions Limited | Construction | 2018 |
| ACA Surveyors Ltd | Professional & scientific | 2024 |
| Acac Properties Limited | Real estate | 2025 |
| Access Information Advisory Limited | Information & communication | 2025 |
| Ace Professional Consulting Limited | Professional & scientific | 2018 |
| Ace Records Limited | Information & communication | 1981 |
| Ace Records Management Limited | Information & communication | 2016 |
| Acorn Garage Doors Group Ltd | Construction | 2021 |
| Acsi Properties Ltd | Real estate | 2023 |
| Acunutrition Limited | Health & social care | 2003 |
| AD Plumbing & Heating Services Ltd | Construction | 2020 |
| Adamas Estates Limited | Real estate | 2013 |
| Adamsrgns Ltd | Health & social care | 2024 |
| Adaton Consulting Limited | Information & communication | 2014 |
| Addition Solutions Ltd | Administrative & support | 2012 |
| Adluma Limited | Wholesale & retail | 2001 |
| Admin Plus (Europe) Limited | Professional & scientific | 2004 |
| Administration (Wellingborough) Limited | Administrative & support | 1968 |
| ADP Restaurant Limited | Hospitality | 2011 |
| Adrian Artworks Ltd | Professional & scientific | 2018 |
| Advance Tanning Limited | Other services | 2012 |
| Aeax Properties Ltd | Real estate | 2026 |
| Aeronexa Ltd | Manufacturing | 2022 |
| Aery Homes Ltd | Real estate | 2017 |
| Aery Property Ltd | Real estate | 2017 |
| Aesthetic Leather Design Limited | Manufacturing | 2013 |
| Afri Legacy Incorporated Ltd | Arts & recreation | 2024 |
| AG & KG Estates Ltd | Real estate | 2013 |
| Agent Brains Escape Games Ltd | Arts & recreation | 2019 |
| AGP Funding (Euro) Ltd | Financial services | 2024 |
| AGP Funding Ltd | Financial services | 2024 |
| AGP Sustainable Real Assets Limited | Professional & scientific | 2018 |
| AI Futures Ltd | Administrative & support | 2023 |
| Air Techniques International Ltd | Manufacturing | 1999 |
| Aircrew Training Solutions Ltd | Professional & scientific | 2023 |
| AJ Operations Limited | Other services | 2025 |
| AJG Rentals Ltd | Real estate | 2025 |
| AJL Drive Ltd | Education | 2026 |
| AJL Warehousing Ltd | Professional & scientific | 2025 |
| AK Hairdressing Ltd | Other services | 2018 |
| AK Tyres and Repair Centre Ltd | Wholesale & retail | 2025 |
| AKA Traders Limited | Wholesale & retail | 2018 |
| Akay Care Services Limited | Health & social care | 2022 |
| Akkia Property Ltd | Real estate | 2020 |
| Al-Warrak Publishing Limited | Information & communication | 1995 |
| Alberti Interactive Ltd | Information & communication | 2023 |
| Albon Financial Planning Ltd | Professional & scientific | 2024 |
| Alchemy Creations Limited | Information & communication | 2008 |
| Alexander Lewis Estates Limited | Real estate | 2017 |
| Alfa Tango Ltd | Manufacturing | 2025 |
| Algae Scope Ltd | Professional & scientific | 2023 |
| ALH Property Investors Ltd | Real estate | 2019 |
| ALH Property Services Ltd | Real estate | 2020 |
| ALI Aras Ltd | Hospitality | 2023 |
| ALI Barrett Ltd | Professional & scientific | 2023 |
| ALI Guldal Investments Ltd | Real estate | 2018 |
| Ali's Venture Ltd | Hospitality | 2022 |
| Alija Ltd | Construction | 2018 |
| Alison Anderson Interiors Ltd | Professional & scientific | 2003 |