| LM Carpet & Flooring Solutions Ltd | Construction | 2022 |
| Lmrce Ltd | Construction | 2025 |
| Loaf by the Sea Limited | Hospitality | 2023 |
| Loaf Sandgate Limited | Hospitality | 2023 |
| Loaf Trading Limited | Hospitality | 2017 |
| LOC8 Global Limited | Extraterritorial | 2016 |
| Local Blend Home Limited | Wholesale & retail | 2016 |
| Local Vape Limited | Wholesale & retail | 2018 |
| Localstyle Limited | Real estate | 1986 |
| Locked in Rooms Limited | Arts & recreation | 2017 |
| Lockwood Building Projects Limited | Construction | 2022 |
| Loconoco Limited | Professional & scientific | 2023 |
| Logsys Limited | Information & communication | 2023 |
| London Road Press Ltd | Manufacturing | 2010 |
| Loom Coffee Limited | Hospitality | 2026 |
| Lordpower Limited | Hospitality | 2000 |
| Loro Sport Ltd. | Wholesale & retail | 2020 |
| Lost Souls Hospitality Ltd | Hospitality | 2024 |
| Loud Lemon Limited | Information & communication | 2004 |
| Love My Leisure Limited | Administrative & support | 2012 |
| LOW Tide Properties Limited | Real estate | 2021 |
| Lowh Studio Limited | Professional & scientific | 2021 |
| Loylymark Ltd | Professional & scientific | 2025 |
| Lpmc Properties Limited | Real estate | 2018 |
| LS Capital Investments Limited | Financial services | 2022 |
| LSE Building Standards Ltd | Professional & scientific | 2018 |
| LSF Cleaning Limited | Administrative & support | 2022 |
| LSO Stone Ltd | Manufacturing | 2022 |
| Lucas Landscape Maintenance Limited | Administrative & support | 2016 |
| Lucas Management Ltd | Real estate | 2018 |
| Lucky Hythe Ltd | Wholesale & retail | 2018 |
| Lucy Warnock Consulting Ltd | Professional & scientific | 2024 |
| Luke Pattie Limited | Administrative & support | 2010 |
| Lumen OWL Limited | Manufacturing | 2020 |
| Luna Films Ltd | Information & communication | 2020 |
| Lunasol Innovation Limited | Professional & scientific | 2023 |
| LUX Electrical Contractors Ltd | Construction | 2024 |
| Luxe Manor Construction Ltd | Construction | 2025 |
| Luxford's Hair & Beauty Ltd | Other services | 2020 |
| Luxurious Pet Move Abroad Ltd | Transport & logistics | 2024 |
| Luxury Pet Taxi Ltd | Wholesale & retail | 2022 |
| Lwandy's & Co Ltd | Manufacturing | 2025 |
| LWF Fundraising Ltd | Other services | 2021 |
| Lyminge Community Hub CIC | Health & social care | 2025 |
| LYN Court Shorncliffe Road RTM Company Limited | Extraterritorial | 2013 |
| Lynchpin Property Limited | Real estate | 2010 |
| Lyra Consulting Limited | Professional & scientific | 2024 |
| M & K Simpson Services Ltd | Administrative & support | 2016 |
| M Chandler Counselling Service Ltd | Health & social care | 2013 |
| M Stott Rail Limited | Other services | 2016 |
| M&B Medics Ltd | Administrative & support | 2022 |
| M&B Security Ltd | Administrative & support | 2022 |
| M&C Soloutions Limited | Professional & scientific | 2011 |
| M&E Property and Holdings Limited | Real estate | 2019 |
| M&E Property Maintenance Limited | Construction | 2020 |
| M&M Construct Ltd | Construction | 2023 |
| M&S Turner Ltd | Real estate | 2025 |
| M.A.G 2 Construction Ltd | Construction | 2008 |
| MA Property Living Ltd | Financial services | 2023 |
| Maaf Services Ltd | Professional & scientific | 2020 |
| MAC Aviation Engineering Ltd | Transport & logistics | 2021 |
| Macca Properties Limited | Real estate | 2016 |
| MACKINTOSH14 Limited | Professional & scientific | 2025 |
| Macon Race Cars Limited | Manufacturing | 2004 |
| Made in Folkestone Limited | Professional & scientific | 2023 |
| Made With Champagne Limited | Information & communication | 2021 |
| Madeira Court (Folkestone) Limited | Households | 1961 |
| Maheswaran Ltd | Information & communication | 2026 |
| Maidstone Mews Limited | Construction | 2022 |
| Maidstone Tree Services Ltd | Agriculture & fishing | 2016 |
| Mail Expertise LLP | | 2012 |
| Maitreya Samuha Ltd | Other services | 2024 |
| Majestic Kitchen Ltd | Hospitality | 2020 |
| Mama Stores Limited | Wholesale & retail | 2025 |
| Management @ NO 2 RTM Company Ltd | Real estate | 2022 |
| Management Property Arundale Limited | Households | 2015 |
| Manor Court (Folkestone) RTM Company Limited | Households | 2016 |
| Manor House Residents Association (Folkestone) Limited | Households | 1996 |
| Manorial Title Register Limited | Information & communication | 2023 |
| Mansfield Capital Limited | Real estate | 2015 |
| Mansion Garden Properties UK Limited | Professional & scientific | 2005 |
| Manstone Developers Ltd | Construction | 2013 |
| MANUFACTURER2YOU Ltd | Wholesale & retail | 2023 |
| Marchwoods (Motor Engineers) Limited | Wholesale & retail | 2007 |
| Marco Campardo Studio Ltd | Professional & scientific | 2022 |
| Margins Accounting Services Ltd | Professional & scientific | 2013 |
| Marine Training Corps C.I.C. | Education | 2021 |
| Marissa Kara Aesthetics Ltd | Other services | 2021 |
| Maritek Group Limited | Manufacturing | 2024 |
| Mark Davies Construction Ltd | Construction | 2015 |
| Mark G Richardson Limited | Professional & scientific | 2024 |
| Mark Gubbins Ltd | Financial services | 2023 |
| Mark Rampton (UK) Limited | Arts & recreation | 2018 |
| Mark Rampton Ltd | Administrative & support | 2010 |
| Markup UK Conferences Limited | Administrative & support | 2018 |
| Marleys Bistro Ltd | Hospitality | 2018 |
| Marsh Groundworks UK Limited | Administrative & support | 2009 |
| Marshall Health & Safety Services Ltd | Professional & scientific | 2017 |
| Martello Hire & Logistics Limited | Administrative & support | 2021 |
| Martello Mechanical Services Limited | Construction | 2023 |