| Mdsure Solutions Limited | Administrative & support | 2025 |
| Meadowcroft Cattery Ltd | Health & social care | 2015 |
| Medusa Court Residents Association Limited | Households | 2006 |
| Mertim Limited | Hospitality | 2021 |
| Metro Cleaning (UK) Limited | Administrative & support | 2006 |
| Metro Soulz Ltd | Wholesale & retail | 2025 |
| MGB Construction and Renovation Ltd | Construction | 2018 |
| Mill & SON Services Ltd | Construction | 2022 |
| Ming & Xing Mandarin House Ltd | Hospitality | 2022 |
| Mirubavu Limited | Wholesale & retail | 2021 |
| Mivo Ltd | Transport & logistics | 2019 |
| Modern Packaging (UK) Limited | Manufacturing | 1990 |
| Motor Assist & Transport Ltd | Transport & logistics | 2026 |
| MR Chips Essex Ltd | Hospitality | 2025 |
| MR Harry Barbers Ltd | Administrative & support | 2019 |
| MR Pasha Ltd | Other services | 2026 |
| Mrcb Services Ltd | Construction | 2025 |
| Muir Wood Furnishings Limited | Manufacturing | 2025 |
| Mumma’S Cafe on the Green Ltd | Hospitality | 2022 |
| Nail Bar Limited | Other services | 2011 |
| NAR Cafe Limited | Hospitality | 2021 |
| NAS Property Ltd | Real estate | 2024 |
| Natural Force Software Development Limited | Information & communication | 2020 |
| Nautilus Property Services Ltd | Real estate | 2024 |
| Navyard Limited | Construction | 1995 |
| Nema Fabrications Ltd | Manufacturing | 2012 |
| Network Cube Ltd | Information & communication | 2012 |
| New Hall (Dovercourt) Management Company Limited | Households | 2021 |
| NIB Isareb Ltd | Transport & logistics | 2021 |
| NMH Property Services Limited | Real estate | 2003 |
| Node AV Limited | Professional & scientific | 2023 |
| NOR Systems Limited | Extraterritorial | 2000 |
| Nova Sage Creations Ltd | Arts & recreation | 2024 |
| NVQ Workforce Training Ltd | Construction | 2008 |
| O M Rewires Limited | Construction | 2023 |
| Oakey Dokeys Pre-School Limited | Education | 2012 |
| Oakley Capital Properties Ltd | Real estate | 2025 |
| Oakley Cf&A Limited | Professional & scientific | 2016 |
| Oakley Prescriptions Limited | Wholesale & retail | 2018 |
| Oakridge Haven Limited | Health & social care | 2025 |
| OBL Cleaning Ltd | Administrative & support | 2023 |
| Occasions Covered Limited | Administrative & support | 2014 |
| Oddballs International Ltd | Extraterritorial | 2016 |
| Old Oaks Cars Limited | Wholesale & retail | 2023 |
| Old School Court (Ramsey) Management Limited | Households | 2023 |
| Omega Energy Solutions Ltd | Construction | 2025 |
| One Stop Steel Shop Ltd | Manufacturing | 2015 |
| Orawa Drive Ltd | Transport & logistics | 2026 |
| Orin Marine Ltd | Construction | 2021 |
| Ovenden Book-Keeping and Accounting Services Limited | Professional & scientific | 2011 |
| Owlgate Limited | Information & communication | 1999 |
| P & S Property Holdings Ltd | Real estate | 2022 |
| P J Summers Limited | Hospitality | 2018 |
| Palmer Medina Estates Ltd | Real estate | 2022 |
| Pandora Car Alarms Essex Ltd | Administrative & support | 2025 |
| Paragon Supplies Limited | Wholesale & retail | 2008 |
| Parkeston Railway Club 2024 Community Interest Company | Health & social care | 2024 |
| Paul Fitch Plumbing & Heating Ltd | Construction | 2016 |
| PCL Bidco Limited | Professional & scientific | 2012 |
| PCL Holdco Limited | Professional & scientific | 2012 |
| Pdlm Projects Ltd | Construction | 2026 |
| Phil a Haulage Limited | Transport & logistics | 2025 |
| Phoenix Pavilions Management Company Limited | Real estate | 2005 |
| Phoenix Units Limited | Professional & scientific | 1984 |
| Plain Creation Limited | Extraterritorial | 2020 |
| PLF (UK) Limited | Manufacturing | 1994 |
| PLF Group Ltd | Financial services | 2019 |
| Potters Plants Dovercourt Ltd | Extraterritorial | 2024 |
| Premier Labellers Limited | Manufacturing | 2002 |
| Premium Admin Ltd | Administrative & support | 2021 |
| Prestige Commercial Maintenance Services Limited | Construction | 2025 |
| Pretty Little Aesthetics Limited | Other services | 2022 |
| Pro Customs Solutions Ltd | Administrative & support | 2022 |
| Purple Polly Limited | Wholesale & retail | 2013 |
| R B Davies Plumbing & Heating Limited | Construction | 2018 |
| R G Leisure Limited | Hospitality | 2012 |
| R Norman Limited | Construction | 2016 |
| R&C White Investments Ltd | Real estate | 2023 |
| Rachel's Space Ltd | Wholesale & retail | 2020 |
| Radio MI Amigo Ltd | Information & communication | 2017 |
| Raful Ltd | Manufacturing | 2019 |
| Rahat Ltd | Hospitality | 2014 |
| Raihana & Co Ltd | Wholesale & retail | 2016 |
| Rail Accessibility Limited | Professional & scientific | 2010 |
| Ramsey Hill Garage Limited | Wholesale & retail | 2003 |
| Rasz Progressive Living Ltd | Health & social care | 2020 |
| Raymondo's Cabs Limited | Transport & logistics | 2025 |
| RCB Refurbishments 2021 Ltd | Construction | 2021 |
| Rebecca Gillies Limited | Arts & recreation | 2021 |
| Recber Ltd | Other services | 2019 |
| Red 7 Developments Ltd | Construction | 2023 |
| Rely-A-Bull Finance Services Limited | Professional & scientific | 2014 |
| Right Brain Solutions Ltd | Information & communication | 2026 |
| Riley’S Spick ‘N’ Span Limited | Administrative & support | 2021 |
| River Lake Ltd | Health & social care | 2014 |
| RJT Waste Clearance Ltd | Water & waste | 2026 |
| Robert Baxter Transport Ltd | Transport & logistics | 2025 |
| Roma Ward Properties Limited | Real estate | 2011 |
| Roots Motor Group Ltd | Wholesale & retail | 2020 |
| Rosey Productions Limited | Information & communication | 2020 |