| Fleet Dental Centre Limited | Health & social care | 2013 |
| FMM Sugarcraft Limited | Other services | 2012 |
| Fresh Valley Foods Limited | Wholesale & retail | 1998 |
| Fresh Valley Wholesale Ltd | Wholesale & retail | 2015 |
| Gareth Wingrove Special Effects Limited | Information & communication | 2015 |
| Gateplan Management Limited | Real estate | 2001 |
| GCZ 108 Limited | Professional & scientific | 2026 |
| Gemini Dynamics Limited | Wholesale & retail | 2023 |
| Gemini Refrigeration Limited | Wholesale & retail | 2025 |
| George Bing Limited | Professional & scientific | 2011 |
| GGB Partners Ltd | Real estate | 2025 |
| Gill Capital Ltd | Real estate | 2021 |
| GLK Holdings (London) Limited | Health & social care | 2026 |
| Globalblock Holdings Ltd | Financial services | 2024 |
| Globalblock Ltd | Information & communication | 2015 |
| GLS Holdings (London) Limited | Health & social care | 2025 |
| Goldstoke Limited | Real estate | 2010 |
| Good Roots Limited | Real estate | 2019 |
| Goodwin Property (2024) Limited | Real estate | 2024 |
| Gotti Limited | Real estate | 2021 |
| GPV Properties Ltd | Real estate | 2020 |
| Greenleaf Hotels Ltd | Real estate | 2012 |
| Greystoke Builders Limited | Construction | 2006 |
| Grip Wise Ltd | Information & communication | 2025 |
| Grosvenor Gardens Limited | Administrative & support | 2003 |
| Gunt Technology Limited | Manufacturing | 2010 |
| Gurooh Ltd | Professional & scientific | 2020 |
| GVM Holdings (London) Limited | Health & social care | 2025 |
| GVS Holdings (London) Limited | Health & social care | 2026 |
| Hair by Alex Salomon Ltd | Other services | 2020 |
| Hamilton Staff Agency Limited | Administrative & support | 2023 |
| Harb Brothers Ltd | Hospitality | 2019 |
| Hawk Investments Limited | Real estate | 2024 |
| Hazcover Hire Limited | Transport & logistics | 2022 |
| Hazel House Children's Care Limited | Health & social care | 2026 |
| Hazel Tree House Ltd | Health & social care | 2025 |
| Headfort Limited | Real estate | 2006 |
| Heat Masters of Herts Ltd | Construction | 2019 |
| Heaths Holdings Ltd | Financial services | 2025 |
| Heroics and ROS Limited | Manufacturing | 1971 |
| Hidden Farm Ltd | Agriculture & fishing | 2025 |
| Highassets Limited | Real estate | 2003 |
| Hill Laundry (Harrow) Limited(The) | Real estate | 1954 |
| Hillrose Property Services Limited | Construction | 2004 |
| Hings Chinese Ltd | Hospitality | 2025 |
| Hirsch Associates Ltd | Administrative & support | 2020 |
| House of Tash Ltd | Extraterritorial | 2017 |
| Hyde SSB Ltd | Administrative & support | 2018 |
| IAN Hale Land Ltd | Real estate | 2026 |
| ID West Malling Ltd | Hospitality | 2006 |
| IM & FT Properties LLP | | 2026 |
| Impiana Ltd | Professional & scientific | 2013 |
| Inclinatio Ltd | Financial services | 2024 |
| Infrablack Limited | Extraterritorial | 2014 |
| Infusd Ltd | Wholesale & retail | 2020 |
| Inso UK (PVT) Limited | Hospitality | 2019 |
| Inspired PR Limited | Professional & scientific | 2008 |
| Intelligent Calculations Limited | Information & communication | 2016 |
| Irefield Limited | Real estate | 1988 |
| Iron AID Foundation | Other services | 2010 |
| Ithaca ADR Limited | Professional & scientific | 2026 |
| Jade's Palace Ltd | Hospitality | 2003 |
| JAG Force Security Ltd | Administrative & support | 2011 |
| JAM2000 Limited | Arts & recreation | 1995 |
| Jensen Three Consulting Limited | Professional & scientific | 1999 |
| JR Nest Limited | Real estate | 2025 |
| JSN London Ltd | Real estate | 2017 |
| K M Electrics London Ltd | Manufacturing | 2025 |
| K. M. Electrics Limited | Construction | 2002 |
| K.J. Lettings LLP | | 2008 |
| Kaboom Rentals Ltd | Administrative & support | 2025 |
| KAJ Investments Limited | Construction | 1994 |
| Kavira London Ltd | Professional & scientific | 2023 |
| Kell Technologies Limited | Real estate | 2012 |
| Kickfiit Limited | Arts & recreation | 2023 |
| Kingston Telecom Ltd | Information & communication | 2011 |
| Kingsway Kitchen Solutions Limited | Construction | 2017 |
| Kiri Consulting Limited | Professional & scientific | 2024 |
| KJ Building and Maintenance Ltd | Construction | 2022 |
| Knight Wovens Ltd | Manufacturing | 2013 |
| Knuckledust Limited | Information & communication | 2013 |
| Kokoa Collection Limited | Hospitality | 2011 |
| Krosbie Group Ltd | Other services | 2022 |
| Krosbie Holdings Ltd | Financial services | 2012 |
| L Heath Consultants Limited | Information & communication | 2023 |
| L.A. Motor Company Limited | Real estate | 1997 |
| Langley Bites Limited | Manufacturing | 2020 |
| Launch Point Holdings Limited | Financial services | 2025 |
| Lawrence Dawson & Co. Limited | Financial services | 1976 |
| LE Provencal Primrose Hill Ltd | Hospitality | 2017 |
| Lena Cohen Ltd | Manufacturing | 2018 |
| Lexcross Limited | Professional & scientific | 2011 |
| Leyland (MK) Limited | Real estate | 2011 |
| LHC Concepts Limited | Real estate | 2025 |
| Liberty Lodge Care Ltd | Health & social care | 2008 |
| Lifestax Limited | Information & communication | 2026 |
| Lighthouse Brands Limited | Wholesale & retail | 2018 |
| Lionhead Construction Limited | Construction | 2005 |
| Little Crickets Learning Centre Limited | Education | 2010 |
| Lmtj Limited | Real estate | 2020 |