| 1 Day Formation Ltd | Wholesale & retail | 2025 |
| 1 Daysbrook Road Freehold Limited | Households | 2008 |
| 1 Deerhurst Road Freehold Ltd | Households | 2024 |
| 1 Degree UK Finance Ltd | Information & communication | 2025 |
| 1 Digital-Shelf Ltd | Professional & scientific | 2025 |
| 1 Dover Street Hold Co Ltd | Hospitality | 2021 |
| 1 Dover Street Lease Co Limited | Administrative & support | 2025 |
| 1 Dover Street Operations Ltd | Hospitality | 2021 |
| 1 Drivezone Ltd | Education | 2025 |
| 1 Driving School Services Ltd | Education | 2021 |
| 1 Duke Street (Reading) Management Company Limited | Households | 2022 |
| 1 Dunollie Place Limited | Households | 1991 |
| 1 Dynham Road Ltd | Households | 2021 |
| 1 Eardley Crescent Limited | Households | 2025 |
| 1 Earls Court Square Freehold Limited | Households | 2014 |
| 1 East Hill SW18 Limited | Real estate | 2020 |
| 1 Easy Translation Limited | Professional & scientific | 2022 |
| 1 Eccleston Square Limited | Households | 1998 |
| 1 Elder Avenue Limited | Households | 1994 |
| 1 Elsworthy Rise Limited | Real estate | 2023 |
| 1 Empire Way Ltd | Real estate | 2018 |
| 1 Englewood Road Management Company Limited | Real estate | 2014 |
| 1 Ennismore Gardens Freehold Limited | Households | 2021 |
| 1 Essendine Road (Freehold) Limited | Households | 2016 |
| 1 Estate Property Ltd | Real estate | 2022 |
| 1 Estelle Road Management Limited | Households | 1984 |
| 1 Eton Avenue Management Limited | Households | 2003 |
| 1 Exeter Management Limited | Households | 2013 |
| 1 Extra Seat Limited | Professional & scientific | 2019 |
| 1 Ferrestone Road RTM Company Ltd | Households | 2022 |
| 1 Finger Crown Ltd | Financial services | 2024 |
| 1 Fire Protection Ltd | Construction | 2020 |
| 1 First Street Ltd | Information & communication | 2025 |
| 1 Fitzroy Place Limited Partnership | | 2012 |
| 1 Five Fields Square Limited | Real estate | 2021 |
| 1 Flaxseed LDN Limited | Real estate | 2019 |
| 1 for ALL Foods Limited | Wholesale & retail | 2017 |
| 1 Fordingley Road Freehold Limited | Households | 2022 |
| 1 Fordingley Road RTM Company Limited | Real estate | 2015 |
| 1 Fortisconstruct Ltd | Construction | 2025 |
| 1 Four Productions Limited | Information & communication | 2018 |
| 1 French ROW Ltd | Hospitality | 2025 |
| 1 Frognal (Management) Limited | Households | 1997 |
| 1 Gledhow Gardens Limited | Households | 2002 |
| 1 Glendower Place RTM Company Ltd | Households | 2016 |
| 1 Gloucester Street RTM Company Limited | Households | 2013 |
| 1 Goal Analytics Limited | Information & communication | 2024 |
| 1 Graham Road Freehold Company Limited | Households | 2026 |
| 1 Granary Ltd | Professional & scientific | 2013 |
| 1 Grange Ltd | Real estate | 2026 |
| 1 Green Foods Ltd | Hospitality | 2022 |
| 1 Grenadier Gardens Limited | Real estate | 2021 |
| 1 Grosvenor Mayfair Limited | Real estate | 2026 |
| 1 Grosvenor Parade Ltd | Real estate | 2026 |
| 1 Hampstead Hill Gardens Freehold Ltd. | Households | 2001 |
| 1 Hare Court Chambers Limited | Administrative & support | 2025 |
| 1 Harecourt Road Islington Limited | Administrative & support | 2003 |
| 1 Harrington Gardens Limited | Real estate | 2026 |
| 1 Hdrd Limited | Real estate | 2015 |
| 1 Heathfield Gardens (Freehold) Limited | Extraterritorial | 2011 |
| 1 High Street Poole Limited | Professional & scientific | 2014 |
| 1 High Street Studios Limited | Construction | 2024 |
| 1 Hollybush Terrace Limited | Real estate | 2013 |
| 1 Holmewood Gardens Management Company Limited | Real estate | 2005 |
| 1 Holtwood Road Limited | Construction | 2018 |
| 1 Home Service Ltd | Manufacturing | 2020 |
| 1 Homestead Road Limited | Households | 1992 |
| 1 HOP Club Ltd | Manufacturing | 2026 |
| 1 Hopton Road Freehold Limited | Households | 2015 |
| 1 Hour Quick Alterations Ltd | Other services | 2022 |
| 1 Howitt Road Management Company Limited | Real estate | 2002 |
| 1 HWL Ltd | Real estate | 2024 |
| 1 Hyde Park Square RTM Company Ltd | Households | 2025 |
| 1 in 10 Dyslexia Limited | Education | 2024 |
| 1 in 3 Women CIC | Information & communication | 2025 |
| 1 in 360 Limited | Information & communication | 2017 |
| 1 Inman Road Management Company Limited | Households | 1996 |
| 1 IP Holdings LLP | | 2009 |
| 1 Jacksons Lane Freehold Limited | Real estate | 2018 |
| 1 Jacksons Lane Management Co. Limited | Households | 1987 |
| 1 Jeffreys Road Freehold Limited | Hospitality | 2002 |
| 1 Jeweller Ltd | Wholesale & retail | 2026 |
| 1 Jupiter Star Limited | Hospitality | 2018 |
| 1 K.R. Freehold Limited | Administrative & support | 2017 |
| 1 Kelross Road Limited | Real estate | 2010 |
| 1 Kennington Park Place Limited | Hospitality | 2006 |
| 1 Kensington Gate Freehold Limited | Households | 2023 |
| 1 Kensington Road Management Company Limited | Extraterritorial | 2014 |
| 1 Kent House RTM Company Limited | Households | 2024 |
| 1 Kenwyn Road Limited | Households | 2017 |
| 1 Kings Avenue Management Limited | Professional & scientific | 2005 |
| 1 Kingscourt Road Limited | Households | 2009 |
| 1 Knoll Road Management Company Limited | Professional & scientific | 1991 |
| 1 Ladbroke Crescent Management (2014) Limited | Real estate | 2013 |
| 1 Lady Somerset Management Limited | Real estate | 2012 |
| 1 Lambert Road Freehold Company Limited | Households | 2017 |
| 1 Lancaster Gardens Developments Limited | Real estate | 2014 |
| 1 Landcroft Road Limited | Real estate | 2017 |
| 1 Lane Motors Ltd | Professional & scientific | 2025 |
| 1 Lane Recovery Ltd | Transport & logistics | 2025 |