| Lr-Xs (UK) Ltd | Wholesale & retail | 2013 |
| Lrcs Medical Ltd | Health & social care | 2024 |
| LRK Accounting Limited | Professional & scientific | 2020 |
| LRP Civil Engineering Limited | Professional & scientific | 2023 |
| LRY 2015 Ltd | Administrative & support | 2015 |
| LS Marketing Services Ltd | Professional & scientific | 2018 |
| LS Tech Services Limited | Information & communication | 2017 |
| LSF Hospitality Ltd | Administrative & support | 2026 |
| LSG2 Consultancy Ltd | Professional & scientific | 2023 |
| LT Kite Property Services Ltd | Real estate | 2021 |
| LT Medical Services Limited | Health & social care | 2015 |
| LT Welding and Fabrications Ltd | Construction | 2016 |
| Luanelle Limited | Health & social care | 2023 |
| Lucas Aero Technics Limited | Manufacturing | 2017 |
| Lucas,Hodson and Lucas Limited | Wholesale & retail | 1963 |
| Lucaslegal Ltd | Professional & scientific | 2015 |
| Lucky MAN TV Limited | Information & communication | 2017 |
| Lucky Star (TA) Limited | Other services | 2011 |
| Lucy Hicklin Limited | Health & social care | 2024 |
| Luis Martinez Ltd | Arts & recreation | 2006 |
| Luke Morgan Consulting Limited | Real estate | 2025 |
| Luke Sherwin Creative Limited | Professional & scientific | 2008 |
| Lumbini Investments Limited | Wholesale & retail | 2018 |
| Lumen Partners Group Ltd | Professional & scientific | 2025 |
| Luna Moon Logistics Limited | Transport & logistics | 2017 |
| Luna Pharma Consulting Ltd | Health & social care | 2016 |
| Luna Wellness Ltd | Manufacturing | 2019 |
| Lunar Developments INT Ltd | Energy | 2021 |
| Lusori Holdings Limited | Financial services | 2022 |
| Lusted Consulting Limited | Professional & scientific | 1993 |
| Luum Limited | Extraterritorial | 2016 |
| Luxor Pools Ltd | Manufacturing | 2021 |
| Luxsa Lighting Limited | Wholesale & retail | 1994 |
| LUZ Services Ltd | Administrative & support | 2025 |
| Lyle's Landscapes Limited | Administrative & support | 2022 |
| Lynch Architects Limited | Professional & scientific | 2005 |
| Lynwood House Limited | Construction | 2015 |
| M & C Consultancy Services Ltd | Professional & scientific | 2020 |
| M & M Building Developers Limited | Other services | 2017 |
| M & M Developers LLP | | 2017 |
| M & P Properties Limited | Hospitality | 1994 |
| M and N Asset Management LLP | | 2017 |
| M H Plumbing & Heating (Kent) Limited | Construction | 2018 |
| M J K Groundworks & Construction Ltd | Construction | 2015 |
| M K a Architects Ltd | Professional & scientific | 2006 |
| M M George Limited | Other services | 2024 |
| M N Jenks & Co Limited | Professional & scientific | 2002 |
| M Sagoo Limited | Health & social care | 2010 |
| M Zuleika Ltd | Health & social care | 2018 |
| M&A Manor Limited | Real estate | 2026 |
| M&G’S Cleaning Ltd | Administrative & support | 2024 |
| M&M Developments (Kent) Ltd | Construction | 2016 |
| M. P. M. (Projects) Limited | Construction | 2005 |
| M.A. Ludwick Plumbing & Heating Limited | Other services | 2012 |
| M.J. Pallets LLP | | 2008 |
| M.Pascoe.W.I.S Limited | Financial services | 2018 |
| M2S Services Ltd | Wholesale & retail | 2024 |
| MA Consultants U.K Ltd | Education | 2023 |
| MA Social Ltd | Arts & recreation | 2020 |
| Macapath Limited | Health & social care | 2020 |
| Maccarthy Medical Practice Ltd | Health & social care | 2020 |
| Mackay Meters (UK) Limited | Manufacturing | 1991 |
| Made in the Ukraine Ltd | Professional & scientific | 2024 |
| Made in UA Ltd | Professional & scientific | 2025 |
| Made to BE Driven Ltd | Wholesale & retail | 2024 |
| Madelinemolloy Limited | Professional & scientific | 2024 |
| MAG Anaesthesia Ltd | Health & social care | 2020 |
| Magham Developments Limited | Construction | 2020 |
| Magnum Partnership (Brenchley) Limited | Construction | 2020 |
| Magnum Partnership (LM) Limited | Construction | 2025 |
| Magnum Partnership (RTW) Limited | Construction | 2021 |
| Magnum Partnership (Sevenoaks) Limited | Construction | 2024 |
| Magrah Services Limited | Administrative & support | 2017 |
| Maguire Baylis Limited | Real estate | 2023 |
| Mahila Limited | Health & social care | 2018 |
| Mahnaz Akunjee Gynaecology Services Limited | Health & social care | 2025 |
| Maidstone Chicken House Limited | Hospitality | 2017 |
| Maidstone Physiotherapy and Sports Injury Clinic Limited | Health & social care | 2013 |
| Maidstone Road (Paddock Wood) Management Limited | Households | 2024 |
| Maiseypay Limited | Administrative & support | 2019 |
| Maison Brenchley Ltd | Real estate | 2025 |
| Maison Touzet Ltd | Administrative & support | 2005 |
| Majestic Lofts & Carpentry Ltd | Construction | 2021 |
| MAK2020 Limited | Real estate | 2023 |
| Make Capital Technology Ltd | Information & communication | 2018 |
| Malcolm G Consulting Ltd | Professional & scientific | 2024 |
| Maldon Oceanic Limited | Administrative & support | 1997 |
| Malen Limited | Real estate | 2015 |
| Mallion Corporate Services Limited | Professional & scientific | 2014 |
| Malozza (UK) Limited | Professional & scientific | 1999 |
| Malozza Distribution Limited | Wholesale & retail | 2002 |
| Mammoth Housing Limited | Real estate | 2022 |
| MAN OR Mouse Studio Limited | Professional & scientific | 2002 |
| Managed Estates Limited | Real estate | 1997 |
| Management Services Kent Ltd | Professional & scientific | 2019 |
| Mango Construction Services Limited | Construction | 2016 |
| Mangus Creative Limited | Information & communication | 2008 |
| Manhar 7 MP Limited | Construction | 2017 |
| Manhar Holding (UK) Limited | Construction | 2015 |
| Manhar Property (Chatham) Limited | Construction | 2016 |