| Inclusive Development Limited | Other services | 2021 |
| Intellegens Limited | Professional & scientific | 2017 |
| International Development Parks Limited | Hospitality | 2024 |
| International Publishing Services Ltd | Information & communication | 1994 |
| Isohelio Ltd | Information & communication | 2018 |
| J Halbert Consulting Limited | Professional & scientific | 2020 |
| Jack Taylor Holdings Limited | Financial services | 2026 |
| Jamaa Ltd | Financial services | 2025 |
| JB Milton Limited | Hospitality | 2019 |
| JCF Consultants Limited | Professional & scientific | 2018 |
| JET Developments Esher Limited | Construction | 2023 |
| JET Developments Essex Limited | Construction | 2026 |
| JET Investment Developments Limited | Construction | 2021 |
| JET Investments Enfield Limited | Construction | 2021 |
| JET Investments Limited | Real estate | 2014 |
| JO Townshend Architect Limited | Professional & scientific | 2010 |
| JPI Holdings Limited | Construction | 2023 |
| Jtdavison's Ltd | Construction | 2018 |
| Jupita Blue Limited | Hospitality | 2025 |
| Khaki Rhino Ltd | Real estate | 2024 |
| Kiezebrink UK Limited | Manufacturing | 2002 |
| Kiikii Foods Ltd | Hospitality | 2017 |
| Kiikii Limited | Construction | 2013 |
| Kingsmoor Holdings Limited | Information & communication | 2024 |
| Kmor Ltd | Professional & scientific | 2025 |
| KSP Workplace Matters Ltd | Administrative & support | 2017 |
| Ladbroke Holdings Limited | Real estate | 2017 |
| Laffe Limited | Manufacturing | 2018 |
| Lamoureux Ltd | Financial services | 2020 |
| Landview Development Investments UK Ltd | Real estate | 2023 |
| Larkspur International Limited | Professional & scientific | 2017 |
| Lasered Components Limited | Manufacturing | 1998 |
| LB Tech Consulting Ltd | Information & communication | 2026 |
| Lighthouse Aesthetics Limited | Wholesale & retail | 2016 |
| Lighthouse Commercial Consulting Ltd | Other services | 2013 |
| Linkmaster Finance Limited | Other services | 1994 |
| Linkmaster Property Finance Limited | Real estate | 2001 |
| Literature Cambridge Ltd | Education | 2023 |
| Little Paddocks Limited | Hospitality | 2002 |
| Llamadillo Consulting Limited | Information & communication | 2018 |
| Ltjd Holdings Ltd | Financial services | 2025 |
| Lupin Investments UK Ltd | Real estate | 2023 |
| M Delamere LLP | | 2022 |
| M & M Building and Decorating Ltd | Construction | 2014 |
| M & R Haydon Export/Import Limited | Manufacturing | 2025 |
| M&R Bennett Limited | Professional & scientific | 2020 |
| Macintosh Property Services Ltd | Construction | 2024 |
| Magma Cars Limited | Wholesale & retail | 2023 |
| Marconato Limited | Hospitality | 2000 |
| Marconato Restaurant Ltd | Hospitality | 2016 |
| Mast Safety Ltd | Professional & scientific | 2022 |
| Matt Macintosh Plumbing and Heating Limited | Construction | 2007 |
| MCJ Group Ltd | Financial services | 2020 |
| Meadhall Investments Limited | Real estate | 2021 |
| Meridian Chase Limited | Construction | 2016 |
| Merrydale Plastics Limited | Wholesale & retail | 1996 |
| Meta Financial Planners Ltd | Extraterritorial | 2022 |
| Meta Financial Planning Ltd | Extraterritorial | 2022 |
| Meta Money Ltd | Extraterritorial | 2022 |
| Metroglaze Ltd | Construction | 2003 |
| Mildenhall Memorials Ltd | Manufacturing | 2026 |
| Millertec Limited | Manufacturing | 2016 |
| Minton Care Hotels Ltd | Health & social care | 2015 |
| MJS (Letchworth) Building Services Limited | Construction | 2011 |
| Monk Brothers Joinery Ltd | Manufacturing | 2012 |
| Monk Joinery Ltd | Manufacturing | 2014 |
| Monk Spraying Limited | Manufacturing | 2017 |
| Morton Medica Limited | Health & social care | 2025 |
| MPN UK Limited | Professional & scientific | 2003 |
| MSV Limited | Professional & scientific | 2004 |
| NAD Carpentry Limited | Construction | 2003 |
| Narrowglen Ltd | Construction | 2004 |
| Neologism Ltd | Professional & scientific | 2023 |
| New Home Group Limited | Construction | 2016 |
| Newheat Limited | Construction | 2007 |
| Newton Hall Chase Management Limited | Households | 2023 |
| Nomad Graphique Limited | Arts & recreation | 2002 |
| Novem Systems Ltd | Information & communication | 2025 |
| Oakright Ltd | Transport & logistics | 2003 |
| Obsidian Finance Limited | Financial services | 2026 |
| Obsidian Green Ltd | Construction | 2018 |
| OCB Systems Ltd | Professional & scientific | 2018 |
| Oldacres Limited | Construction | 2012 |
| One Wild One Limited | Wholesale & retail | 2024 |
| Onelife Training Limited | Health & social care | 2003 |
| Optifarm Ltd | Agriculture & fishing | 2018 |
| Ortho ED Ltd | Education | 2020 |
| Orthohubxyz Ltd | Education | 2020 |
| Oundle Limited | Professional & scientific | 2012 |
| OUR Crew Ltd | Information & communication | 2018 |
| Paediatric Neurology Chambers Limited | Health & social care | 2022 |
| Palmer & SON Scaffolding Limited | Construction | 2014 |
| Paper Labels 4 U Limited | Water & waste | 2011 |
| Patterrn Ltd | Professional & scientific | 2011 |
| Paws Playfield Datchworth Ltd | Other services | 2021 |
| PBJ Partners Limited | Financial services | 2026 |
| PCJ Construction & Restoration Limited | Construction | 2025 |
| PCJ Developments Limited | Construction | 2025 |
| PCJ Holdings Limited | Real estate | 2023 |
| Peardon Health and Safety Limited | Administrative & support | 2016 |