| LCT Home Ltd | Wholesale & retail | 2021 |
| Leap in Ltd | Arts & recreation | 2011 |
| Leasam Heights Management Limited | Households | 2012 |
| Leos Camber Limited | Hospitality | 2025 |
| Leptrex Ltd. | Manufacturing | 2011 |
| LES Allodis Limited | Real estate | 1989 |
| LES Reves Ltd | Real estate | 2014 |
| Lfhm Limited | Other services | 2016 |
| Lime Wharf Cafe and Farm Shop Limited | Hospitality | 2014 |
| Little FIX Limited | Other services | 2015 |
| Little Orchard Estates (Battle) Limited | Construction | 2015 |
| Little Orchard Estates Limited | Construction | 2014 |
| Lola & Sidney Ltd | Wholesale & retail | 2024 |
| Loma Supply Limited | Hospitality | 2017 |
| Lotus Imports Limited | Wholesale & retail | 2000 |
| Louisa Codjoe Limited | Health & social care | 2014 |
| Loveland Productions Limited | Information & communication | 2025 |
| LOW Food Miles Ltd | Wholesale & retail | 2010 |
| LRI Solutions Ltd | Wholesale & retail | 2011 |
| Lucari Solutions Limited | Manufacturing | 2019 |
| Lucky Day Films Limited | Information & communication | 2015 |
| Lucy Andrew Limited | Professional & scientific | 2002 |
| Lukada Ltd | Construction | 2025 |
| Luke's Retail Ltd | Wholesale & retail | 2026 |
| Luminescent CIC | Information & communication | 2024 |
| Lyus Carpentry Ltd | Construction | 2016 |
| M Dearden Limited | Transport & logistics | 2003 |
| M I Carpentry Limited | Construction | 2012 |
| M. and C.Farms Limited | Agriculture & fishing | 1940 |
| M.P.D. Lifestyle Limited | Other services | 2004 |
| MA Anand Calzagga Enterprises Ltd | Hospitality | 2018 |
| Magic Caravan Camber Sands Ltd | Hospitality | 2024 |
| Magnolia House RYE Ltd | Hospitality | 2019 |
| Maid in RYE Limited | Administrative & support | 2017 |
| Mannew Property Ltd | Construction | 2021 |
| Manning Wistow Architects Ltd | Professional & scientific | 2007 |
| Manroy Properties LLP | | 2009 |
| Maple Property Consultants Limited | Construction | 2024 |
| Marcus Niamh Ltd | Real estate | 2017 |
| Mark Swait Carpentry Contractors Limited | Construction | 2002 |
| Market ARC Advisory Limited | Administrative & support | 2026 |
| Market Development & Promotional Communications Ltd | Information & communication | 1996 |
| Marley and Barley Ltd | Manufacturing | 2016 |
| Marmalade Floor Limited | Construction | 2016 |
| Martello Appledore 2 Limited | Real estate | 2019 |
| Martello Appledore Limited | Real estate | 2016 |
| Martello Bourne Limited | Real estate | 2017 |
| Martello Bridge Point Limited | Real estate | 2015 |
| Martello Charles Road Limited | Professional & scientific | 2013 |
| Martello Developments Limited | Financial services | 2016 |
| Martello Investments Limited | Real estate | 2018 |
| Martello RYE Creative Centre Limited | Education | 2020 |
| Mary Stanford Lifeboat House Limited | Arts & recreation | 2011 |
| Masters (South East) Limited | Construction | 2015 |
| Material Rescue Limited | Other services | 2024 |
| Matt Sellers Ltd | Information & communication | 2020 |
| MAX A2Z Builders Ltd | Construction | 2024 |
| Mccully & Crane Art Ltd | Wholesale & retail | 2015 |
| MD Medical Devices Group Ltd | Professional & scientific | 2024 |
| Mdlx Technologies Limited | Information & communication | 2024 |
| Medusas Stone Ltd | Manufacturing | 2025 |
| Mehta Property Limited | Real estate | 2016 |
| Merchant & Mills (House) Limited | Wholesale & retail | 2025 |
| Merchant & Mills Ltd | Wholesale & retail | 2011 |
| Mermaid Inn Limited | Hospitality | 1993 |
| Mermaid Leisure Limited | Construction | 2014 |
| Mermaid Limited | Construction | 1996 |
| Mermaid Street Limited | Wholesale & retail | 2026 |
| Meryon Court Limited | Households | 2000 |
| Metris Projects Limited | Construction | 2007 |
| Mightyfist European Distributor Ltd | Manufacturing | 2014 |
| Mill House Properties Limited | Real estate | 2012 |
| Mimi Fleur Limited | Wholesale & retail | 2015 |
| Minnie Bertha's Ltd | Hospitality | 2014 |
| Miss Leylah Linda Limited | Arts & recreation | 2023 |
| MJL Renewables Limited | Construction | 2023 |
| MLT Garage Limited | Wholesale & retail | 2022 |
| Mmxx Estates Limited | Financial services | 2020 |
| Mobile Motorhome Care Ltd | Manufacturing | 2019 |
| Moccz Limited | Manufacturing | 2017 |
| Modwerks Ltd | Information & communication | 2013 |
| Moloney & Partners (Property) Limited | Real estate | 2023 |
| Moloney and Partners Limited | Real estate | 2016 |
| Moloney Country Property Limited | Real estate | 2022 |
| Momentum Marketing RYE Ltd | Administrative & support | 2024 |
| Monkey Business Camber Limited | Hospitality | 2019 |
| Montpelier Interiors Ltd | Professional & scientific | 2020 |
| Moon Sun Nails & Beauty Ltd | Other services | 2023 |
| MPW Carpentry & Building Contractors Limited | Extraterritorial | 2015 |
| Mulberry Leaf Consulting Ltd | Professional & scientific | 2023 |
| Munch Toys Ltd | Manufacturing | 2025 |
| Mundus Interiors Limited | Wholesale & retail | 2025 |
| Music for Young Minds CIC | Education | 2022 |
| Music Lifeline CIC | Health & social care | 2009 |
| Mustafov Limited | Wholesale & retail | 2022 |
| My ERA Skincare Ltd | Manufacturing | 2023 |
| My Fit Bubble Limited | Information & communication | 2009 |
| Mythic Accounting Limited | Professional & scientific | 2025 |
| New London Orchestra Limited | Arts & recreation | 1988 |
| New Pathways Education Ltd | Education | 2024 |