| Havering Engineering Services Ltd | Other services | 2021 |
| Health-Weigh Services Limited | Other services | 2005 |
| Hidden Vision Systems Limited | Wholesale & retail | 2016 |
| Hill Building & Developments Ltd | Construction | 2019 |
| Hill Fencing & Landscaping Ltd | Construction | 2019 |
| Hilton Roofing Limited | Construction | 2018 |
| Hobbits Limited | Construction | 2023 |
| Hodstons Development Ltd | Construction | 2016 |
| Holt Installations Limited | Construction | 2022 |
| Home-Sellerz.Net Limited | Professional & scientific | 2002 |
| Horndon Electrical Testing Limited | Energy | 2026 |
| HRD Development Limited | Construction | 2019 |
| Hunt Site Services Limited | Construction | 2022 |
| Hutch Refurbs Ltd | Construction | 2025 |
| Iaam Enterprise Ltd | Administrative & support | 2025 |
| Ikonmac Limited | Wholesale & retail | 2010 |
| Integral CS Limited | Transport & logistics | 2014 |
| J L Caroline Ltd | Arts & recreation | 2021 |
| J R M Vehicle Solutions Ltd | Wholesale & retail | 2025 |
| Jacksons Warehouse Ltd. | Real estate | 1995 |
| James Alexander Flooring Ltd | Construction | 2023 |
| Jamesongrey PM Ltd | Professional & scientific | 2023 |
| JBS Systems Ltd | Administrative & support | 2026 |
| JC3 Construction Ltd | Construction | 2022 |
| JD Building Developments Ltd | Construction | 2026 |
| JET Demolition Limited | Construction | 2017 |
| JET Management London Ltd | Construction | 2026 |
| JK23 Property Limited | Real estate | 2024 |
| Jltrees Ltd | Agriculture & fishing | 2023 |
| JMF Holdings Cambs Limited | Real estate | 2023 |
| JOE Camden Carpentry Ltd | Construction | 2025 |
| Johnson Executive Transport Ltd | Transport & logistics | 2026 |
| JP Dawson Ltd | Professional & scientific | 2025 |
| JPR Accountancy and Tax Ltd | Professional & scientific | 2023 |
| JT Fibre Comms Ltd | Information & communication | 2023 |
| JT Mechanical Solutions Ltd | Construction | 2021 |
| Jubilee Commercials Ltd | Wholesale & retail | 2026 |
| K & S Public House Limited | Hospitality | 2013 |
| K H Fire Limited | Construction | 2007 |
| Kenlee Auto Services Ltd | Wholesale & retail | 2021 |
| Kenlee Total Car Care Ltd | Wholesale & retail | 2026 |
| Kent Property & Developments Ltd | Real estate | 2022 |
| Kents Construction & Development Ltd | Construction | 2020 |
| Kick Start Property Solutions Ltd | Real estate | 2020 |
| Konnect BPO Technologies Ltd | Administrative & support | 2022 |
| L Salter Limited | Construction | 2022 |
| LAP Transport (UK) Ltd | Transport & logistics | 2026 |
| Laura J Farr Ltd | Information & communication | 2026 |
| Lb's Chelmsford Ltd | Hospitality | 2026 |
| LB6 Limited | Wholesale & retail | 2018 |
| LDB Landscape Design and Build Ltd | Administrative & support | 2026 |
| LDN Construct and Build Ltd | Construction | 2026 |
| LET4 Properties Limited | Real estate | 2024 |
| LH Interior Projects Ltd | Construction | 2022 |
| Lillywhites Electrical Ltd | Construction | 2023 |
| LIP Sync Beauty Limited | Manufacturing | 2016 |
| Little Tylers Livery Ltd | Agriculture & fishing | 2026 |
| LJ Interior Builds Ltd | Construction | 2025 |
| LJW Ventilation Ltd | Manufacturing | 2016 |
| Lodge & Holmes Ltd | Construction | 2025 |
| Lofthouse Drylining Ltd | Construction | 2016 |
| Logixx Consulting Limited | Administrative & support | 2024 |
| London & Essex Enterprises Ltd | Transport & logistics | 2026 |
| London Fleet Solutions Ltd | Wholesale & retail | 2025 |
| London Holistic Academy Ltd | Health & social care | 2019 |
| LOO4U & Services Ltd | Construction | 2024 |
| Loughton Property Ltd | Real estate | 2026 |
| Love Electrical Solutions Ltd | Construction | 2019 |
| LSW Locks Ltd | Administrative & support | 2026 |
| Luxe Executive Transport Limited | Transport & logistics | 2026 |
| Luxe Worldwide Ltd | Professional & scientific | 2025 |
| LWD Commercial Ltd | Wholesale & retail | 2025 |
| M J Heed Electrical Limited | Construction | 2014 |
| Maldon SPH Ltd | Real estate | 2023 |
| Maldon Structural & Plant Hire Ltd | Construction | 2015 |
| Mansion Haus Developments Ltd | Professional & scientific | 2002 |
| MAS SON Construction Limited | Construction | 2017 |
| Matrixs Building Services Ltd | Construction | 2022 |
| Mckanna Holdings Limited | Financial services | 2024 |
| Mckanna Meats Limited | Wholesale & retail | 1983 |
| Melia Ceramica Ltd | Construction | 2026 |
| Meridian World Wide Ltd | Professional & scientific | 2025 |
| Metbuild Ltd | Manufacturing | 2018 |
| MGT IT Consulting Ltd | Information & communication | 2022 |
| Michael Young Plumbing & Heating Ltd | Construction | 2019 |
| Mindset Roofing (UK) Ltd | Construction | 2023 |
| Moore Coaching Limited | Education | 2020 |
| Moore Football Club Ltd | Arts & recreation | 2025 |
| Morgan Property Development Group Limited | Construction | 2021 |
| MOS Plant Limited | Wholesale & retail | 2016 |
| MR Vapes 11 Ltd | Wholesale & retail | 2022 |
| MRL Interiors Ltd | Wholesale & retail | 2020 |
| MS Fabrications Ltd | Manufacturing | 2026 |
| Munifix Limited | Manufacturing | 2012 |
| Murrell Scaffolding (UK) Ltd | Construction | 2026 |
| Mustart Enterprises (UK) Ltd | Wholesale & retail | 2026 |
| MWF Plumbing & Mechanical Ltd | Construction | 2026 |
| Myridium Active.Com Limited | Wholesale & retail | 2000 |
| Natural Beauty Services Limited | Other services | 2011 |
| NC Engineering Services Ltd | Professional & scientific | 2018 |