| 1 Douglas Avenue (Hythe) Limited | Construction | 2020 |
| 101 Hornsey Lane RTM Company Limited | Households | 2006 |
| 15-21 Rainsford RD Limited | Real estate | 2026 |
| 163 Shardeloes Road Management Limited | Households | 1990 |
| 1818 Limited | Professional & scientific | 2020 |
| 187 Elmers END Limited | Real estate | 2024 |
| 1NESECURITY Limited | Financial services | 2025 |
| 2 Essex Road Ltd | Real estate | 2023 |
| 24PROPERTY Ltd | Real estate | 2020 |
| 258 Richmond Road (Freehold) Limited | Households | 2018 |
| 258 Richmond Road RTM Company Limited | Households | 2013 |
| 274 Theatre Limited | Arts & recreation | 2025 |
| 29 VIC Ltd | Real estate | 2025 |
| 32 Degrees Swim School Limited | Education | 2021 |
| 33 High Street Sevenoaks Ltd | Real estate | 2022 |
| 36 Kinsale Road Freehold Limited | Real estate | 2023 |
| 3J&M Limited | Public administration | 2022 |
| 4 in One Limited | Information & communication | 2008 |
| 40 Chastilian Freehold Ltd | Real estate | 2025 |
| 46 Coldharbour Limited | Real estate | 2020 |
| 46810 Drive Limited | Households | 2024 |
| 5N Consulting Limited | Professional & scientific | 2022 |
| 63QTR Limited | Real estate | 2008 |
| 91455 Limited | Construction | 2009 |
| A & D Medical Services Limited | Health & social care | 2005 |
| A B Boutique Limited | Wholesale & retail | 2017 |
| A J S Finance Limited | Financial services | 2012 |
| A Lane Consultants Limited | Financial services | 2009 |
| A1 Appliance Repairs Limited | Manufacturing | 2014 |
| A1 Carriages Car Sales Limited | Wholesale & retail | 2003 |
| A1 Carriages Limited | Wholesale & retail | 1999 |
| AA Dharma Ltd | Real estate | 2025 |
| AB Building Solutions Ltd | Construction | 2016 |
| Abbeywood Floorcoverings Limited | Construction | 1988 |
| Abbeywood Flooring Limited | Professional & scientific | 1972 |
| ABC Roofing and Building Limited | Construction | 2011 |
| Abdul Chota DON Limited | Wholesale & retail | 2025 |
| Abeeba Ltd | Information & communication | 2022 |
| Aberdeen One Ltd | Real estate | 2022 |
| Abfab Landscapes Limited | Administrative & support | 2020 |
| Ability Scaffolding 29 LLP | | 2011 |
| Able Services Ltd | Construction | 2003 |
| Absolute Property Maintenance Group Limited | Construction | 2022 |
| Academy Services (Holdings) Limited | Financial services | 2001 |
| Academy Services (Tendring) Limited | Administrative & support | 2001 |
| Academy Services (Waltham Forest) (Holdings) Limited | Administrative & support | 2003 |
| Academy Services (Waltham Forest) Limited | Administrative & support | 2003 |
| Acaires Ltd | Information & communication | 2019 |
| Accental Services Limited | Professional & scientific | 2026 |
| Accurate Roofing Ltd. | Construction | 2007 |
| Ace Dental Limited | Health & social care | 2020 |
| Ace Drainage Systems Ltd | Water & waste | 2024 |
| Ace’S Properties Ltd | Real estate | 2025 |
| ACM REC Limited | Administrative & support | 2024 |
| Adamlina Limited | Administrative & support | 2023 |
| Adaptive Heating Limited | Construction | 2022 |
| Adem Doda Ltd | Construction | 2024 |
| Adhimar Limited | Health & social care | 2013 |
| Advance Screeding UK Limited | Construction | 2011 |
| Advikaz Motor Sport Limited | Professional & scientific | 2022 |
| Advocacy for ALL | Health & social care | 1997 |
| Aemel Consulting Limited | Other services | 2008 |
| Affinity (Reading) Holdings Limited | Professional & scientific | 2003 |
| Affinity (Reading) Limited | Administrative & support | 2003 |
| Afnopharma UK Ltd | Wholesale & retail | 2025 |
| AGA Comms Ltd | Construction | 2025 |
| Agile Logiciel Limited | Information & communication | 2024 |
| AGP (2) Limited | Extraterritorial | 2001 |
| AGP Holdings (1) Limited | Financial services | 2001 |
| AGS (Southeast) Limited | Wholesale & retail | 2009 |
| AGS Education and Training Limited | Arts & recreation | 2013 |
| AGS Equestrian Ltd | Agriculture & fishing | 2024 |
| AH Security Locksmiths Ltd | Administrative & support | 2022 |
| AIM Property Investments Limited | Real estate | 2021 |
| AIP Ardenham Holding 1 (UK) Ltd | Financial services | 2025 |
| AIP Ardenham Holding 2 (UK) Ltd | Financial services | 2025 |
| AIP CB2 Holding (UK) Ltd | Financial services | 2025 |
| Airspace Homes HA Limited | Construction | 2022 |
| Airspace Homes LA Limited | Construction | 2022 |
| Airspace Homes Limited | Construction | 2022 |
| Airspace Homes Management Limited | Construction | 2022 |
| Airspace Homes PA Limited | Construction | 2022 |
| Aitech Consulting Limited | Information & communication | 2001 |
| AJA Auto Services Limited | Wholesale & retail | 2025 |
| AJS Solutions Inc Ltd | Financial services | 2024 |
| Akal Retail Limited | Hospitality | 2025 |
| AKH Enterprise Limited | Other services | 2022 |
| Albion Heating & Plumbing Ltd | Construction | 2018 |
| Albus Environmental Limited | Water & waste | 2012 |
| Alcb Limited | Real estate | 2019 |
| Alder HEY (Special Purpose Vehicle) Limited | Construction | 2013 |
| Alder HEY Holdco 1 Limited | Professional & scientific | 2013 |
| Alder HEY Holdco 2 Limited | Professional & scientific | 2013 |
| Alder HEY Holdco 3 Limited | Professional & scientific | 2013 |
| Aleia Home Ltd | Administrative & support | 2026 |
| Aleksandar Pavlov Ltd | Transport & logistics | 2025 |
| Alex Griffiths Services Ltd | Professional & scientific | 2013 |
| Alexander Ross Management Services Limited | Professional & scientific | 1980 |
| Alfies Way Ltd | Hospitality | 2025 |
| Ali's IT and Telecommunication Services Limited | Information & communication | 2010 |