| Kismet Properties Limited | Real estate | 2020 |
| KMC Restaurant Limited | Hospitality | 2014 |
| Kognos Energy Limited | Information & communication | 2024 |
| Kognos UK Limited | Information & communication | 2019 |
| Kyran Thrax Ltd | Arts & recreation | 2025 |
| L J Woods VW Audi LLP | | 2026 |
| L. Knight Limited | Real estate | 1942 |
| Lagoon Eco Friendly Cleaners Ltd | Other services | 2013 |
| Lala Scaffolding Ltd | Construction | 2014 |
| Lentrica Limited | Wholesale & retail | 2003 |
| Light Division Limited | Wholesale & retail | 2013 |
| Litcan Properties Ltd | Real estate | 2023 |
| Live Financial Mortgages Ltd | Financial services | 2016 |
| Local Digital Services CIC | Information & communication | 2019 |
| Lola Property Investments Limited | Real estate | 2018 |
| London Lids Limited | Manufacturing | 2001 |
| London Video Camera Hire Limited | Administrative & support | 2013 |
| London Video Productions Limited | Information & communication | 2013 |
| Londonswan 100 Limited | Real estate | 2021 |
| Lord Caninez Ltd | Other services | 2020 |
| LT Prestige Car Services Ltd | Transport & logistics | 2019 |
| LU Jian Holdings Limited | Financial services | 2023 |
| Luxbrella London Limited | Households | 2019 |
| Lyon Healthcare Ltd | Administrative & support | 2023 |
| M a Jones Homes Limited | Construction | 2005 |
| M and D Recruitment Limited | Administrative & support | 2021 |
| M.A. Property Developments Ltd | Construction | 2006 |
| MAA Alpha Investments Ltd | Real estate | 2024 |
| Mackney Holdings Limited | Construction | 2025 |
| Mackney Homes Limited | Construction | 2022 |
| Managed Technology Solutions Limited | Information & communication | 2006 |
| Manhattan House Investments Limited | Real estate | 2023 |
| Manhattan House Limited | Real estate | 2019 |
| Manhattan Management Company Limited | Households | 2020 |
| Mariana Group Limited | Wholesale & retail | 2021 |
| Mark Stephens Homes Limited | Construction | 2023 |
| MF Car Services Ltd | Transport & logistics | 2019 |
| MG Global Solutions Ltd | Wholesale & retail | 2025 |
| Mi&G Limited | Construction | 2016 |
| Mighty Properties Ltd | Real estate | 2018 |
| Mohammed Yousif Investments Ltd | Real estate | 2024 |
| Monk Plumbing & Heating LLP | | 2026 |
| Mooboo Chingford Limited | Hospitality | 2021 |
| Mood Services Limited | Professional & scientific | 2026 |
| Moon Building Construction Ltd | Construction | 2020 |
| Moore Probate Research Limited | Professional & scientific | 2011 |
| Mount Road Runners Ltd | Administrative & support | 2016 |
| MRH Geotechnical Limited | Construction | 1993 |
| Mrmosss Limited | Wholesale & retail | 2025 |
| MS Style Bespoke Furniture Ltd | Manufacturing | 2011 |
| Munchy's.Store Ltd | Hospitality | 2025 |
| MV Construct Limited | Construction | 2014 |
| My Electrolysis Ltd | Other services | 2026 |
| Myrtaj Property Investment Ltd | Real estate | 2023 |
| Naaik Limited | Real estate | 2021 |
| National Links Services Ltd | Transport & logistics | 2021 |
| Neelarm Limited | | 1964 |
| Nefis 2025 Ltd Limited | Hospitality | 2025 |
| Nefton Ltd | Construction | 2017 |
| Nest London Property Services Limited | Real estate | 2011 |
| Newstoke Limited | Real estate | 2018 |
| NJP Capital Limited | Real estate | 2019 |
| NJP Developments Limited | Construction | 2013 |
| Ntel Communications Ltd | Information & communication | 2010 |
| O Howell's Driving Limited | Transport & logistics | 2019 |
| Oaak Construction Ltd | Administrative & support | 2018 |
| Olimas Investments LLP | | 2011 |
| Oshun Healing Limited | Health & social care | 2023 |
| Osman Hassan Husseyin Ltd | Professional & scientific | 2024 |
| Parity Partners Limited | Real estate | 2019 |
| Pasenguard Limited | Real estate | 1975 |
| PAT Pong Limited | Hospitality | 2012 |
| Pembrook Design Limited | Construction | 1988 |
| Perfect Data Services Limited | Information & communication | 2024 |
| PFB Data Ltd | Construction | 2019 |
| Phase Flooring Ltd | Construction | 2010 |
| Philma Reporting Limited | Health & social care | 2019 |
| Picks Cottage Fishery Ltd | Arts & recreation | 2012 |
| Pilates in the Clouds Ltd | Other services | 2014 |
| Pjgroupuk Limited | Administrative & support | 2024 |
| Pjmax Enfield Town Limited | Hospitality | 2024 |
| Pjmax Loughton Ltd | Hospitality | 2024 |
| Pjmax Walthamstow Limited | Hospitality | 2024 |
| Pjmax Woodford Limited | Hospitality | 2024 |
| Planet Compass CIC | Education | 2023 |
| POP UP Energy Towers Limited | Extraterritorial | 2012 |
| Poroga Ltd | Other services | 2022 |
| Portland Place Limited | Real estate | 1962 |
| Porto Clean Limited | Administrative & support | 2025 |
| Potion Wines Ltd | Other services | 2019 |
| Prestige Management Services Ltd | Real estate | 2017 |
| Primary Present Ltd | Information & communication | 2023 |
| Pro-Tax Consultancy Limited | Professional & scientific | 1997 |
| Project Space Builders Ltd | Construction | 2026 |
| Quantiso Ltd | Wholesale & retail | 2025 |
| Quel Limited | Administrative & support | 2026 |
| R & Z Property Management Limited | Real estate | 2010 |
| R-Wire Limited | Construction | 2015 |
| Rdslaw Limited | Professional & scientific | 2014 |
| Real Exposure Limited | Professional & scientific | 2018 |