| Keith Murray Spears Limited | Professional & scientific | 2000 |
| KEM 2020 Limited | Financial services | 2020 |
| Kept Hearing Ltd | Wholesale & retail | 2026 |
| Kids Crew Ltd | Education | 2024 |
| Kingsley Court Development Limited | Real estate | 2014 |
| Kingsley Court Maintenance Company Limited | Households | 1991 |
| Kirby Civil Engineering Ltd. | Construction | 2017 |
| Kirby Express Ltd | Wholesale & retail | 2026 |
| Kirby Interiors Ltd | Construction | 2007 |
| Kirby Investment Ltd | Real estate | 2020 |
| Kirby Properties Limited | Households | 2009 |
| Kittys Jules Ltd | Wholesale & retail | 2021 |
| KLM Kitchens and Bathrooms Limited | Wholesale & retail | 2011 |
| KMJ Property Developments Limited | Real estate | 2020 |
| Kyro Design Limited | Information & communication | 2022 |
| L&B Frinton Ltd | Hospitality | 2023 |
| L-X Care Limited | Health & social care | 2025 |
| LA Claudia Legal Limited | Professional & scientific | 2015 |
| Lacuna Method Ltd | Wholesale & retail | 2019 |
| Lady Phoenix 2020 Limited | Hospitality | 2019 |
| Landsquared Ltd | Wholesale & retail | 2021 |
| Lanes Traffic Management Ltd | Transport & logistics | 2024 |
| Lauries Electrical Solutions Ltd | Manufacturing | 2025 |
| LC Online Sales Ltd | Wholesale & retail | 2025 |
| Leanprint Limited | Manufacturing | 2003 |
| Leathers Bakeries Ltd | Manufacturing | 2026 |
| Lenforce Limited | Households | 1979 |
| Leys Farm Yards Limited | Real estate | 2024 |
| Libitina CIC | Education | 2023 |
| Light Into Europe | Health & social care | 1993 |
| Limehouse Retail Ltd | Wholesale & retail | 2014 |
| LMF Flooring Ltd | Construction | 2025 |
| Lodge Farm Business Units Ltd | Real estate | 2024 |
| Love to Go Ltd | Hospitality | 2021 |
| Loxford Equipment Co.Limited | Manufacturing | 1963 |
| M & J PO Limited | Wholesale & retail | 2023 |
| M & M Farmacia Limited | Wholesale & retail | 2013 |
| M&M Realty Ltd | Real estate | 2016 |
| M2M Media Ltd | Information & communication | 2025 |
| M80 Ltd | Construction | 2019 |
| Makazi Properties Limited | Real estate | 2023 |
| Mantair Ltd | Other services | 1998 |
| Mark Vyse Electrical Ltd | Construction | 2010 |
| Marks Slade Associates Limited | Real estate | 2016 |
| Maryland (Frinton) Limited | Households | 1999 |
| Maxio Limited | Administrative & support | 2017 |
| Mayel Skin and Body Ltd | Other services | 2021 |
| MCN Agencies Limited | Other services | 2020 |
| MDS Reid Electrical Limited | Construction | 1998 |
| Medusa Court Limited | Real estate | 1990 |
| Megasis Ltd | Information & communication | 2024 |
| Metal Designs Ltd | Manufacturing | 2023 |
| Mikah Limited | Real estate | 2021 |
| Mims Pubs Ltd | Hospitality | 2016 |
| MJ Smith Builder Limited | Construction | 2013 |
| Moigne Developments Ltd | Information & communication | 2023 |
| Montessa Limited | Construction | 2014 |
| Moonstone Cleaning Services Ltd | Administrative & support | 2021 |
| MPD Hospitality NO2 Ltd | Hospitality | 2012 |
| MPD Hospitality NO3 Ltd | Hospitality | 2013 |
| Mplettings Ltd | Real estate | 2018 |
| MR Clear IT Ltd | Water & waste | 2012 |
| MS Childcare Ltd | Health & social care | 2026 |
| Mugiwara Mirai Ltd | Wholesale & retail | 2024 |
| Mycargarage Limited | Wholesale & retail | 2011 |
| N.J.J.T. Limited | Professional & scientific | 2003 |
| Narissa Kang'Ombe Ltd | Administrative & support | 2015 |
| Nash and Sharpe SPV1 Ltd | Construction | 2018 |
| National Youth Music Theatre Ltd | Arts & recreation | 1980 |
| Nazari Investments Ltd | Real estate | 2021 |
| Nicholas Dominic Ltd | Construction | 2026 |
| Nicmar Bbts Ltd | Professional & scientific | 2025 |
| NO Filter Business Solutions Ltd | Professional & scientific | 2020 |
| Nordon Utilities Ltd | Construction | 2025 |
| Nova PDL Ltd | Professional & scientific | 2025 |
| Oakway Contractors Limited | Construction | 2005 |
| Ocean Breeze Yoga Ltd | Health & social care | 2025 |
| OD Housing & Developments Ltd | Real estate | 2025 |
| Onlyyousalon Limited | Other services | 2026 |
| Opalto Limited | Information & communication | 2023 |
| Orchard Management Company (Frinton) Limited | Households | 2020 |
| Oxford Court (Frinton) Residents' Company Limited | Households | 2006 |
| P. Sander Properties Limited | Real estate | 2026 |
| P2G Engineering Services Ltd | Professional & scientific | 2020 |
| PA Tanner Limited | Financial services | 2017 |
| Page Property Group Limited | Real estate | 2023 |
| Pamir Food Ltd | Wholesale & retail | 2022 |
| Passipassi Ltd | Wholesale & retail | 2023 |
| PEP Computer Services Ltd | Information & communication | 1995 |
| Peter Holmes Creative Imaging Limited | Professional & scientific | 2011 |
| PG Exec Ltd | Administrative & support | 2014 |
| PGD Promotions Ltd | Arts & recreation | 2006 |
| Plant Theatre Ltd | Manufacturing | 2008 |
| Plethora of Words Limited | Information & communication | 2020 |
| Pondtail Lodge Residents Association Limited | Households | 1999 |
| Practical Integral & Beautiful Limited | Professional & scientific | 2003 |
| PRAESIDIUM365 Ltd | Professional & scientific | 2023 |
| Principal Homes Limited | Real estate | 2006 |
| Pro-Fit Auto Installations Ltd | Wholesale & retail | 2022 |
| Q H Maldon Ltd | Hospitality | 2018 |