| Make Innovate Consult Ltd | Professional & scientific | 2025 |
| Mallia Hair Limited | Other services | 2024 |
| Mango Hair ETC Limited | Other services | 2006 |
| Marc Smith Bespoke Limited | Manufacturing | 2016 |
| Marine Theatre Limited | Professional & scientific | 2003 |
| Mark Snelling Therapy Ltd | Health & social care | 2022 |
| Marsden Public House Ltd | Hospitality | 2025 |
| Martin Gordon Landscapes Ltd | Other services | 2006 |
| Marton Developments Limited | Construction | 2014 |
| Materials Matter Ltd | Professional & scientific | 2017 |
| Maydown Farm Limited | Professional & scientific | 2003 |
| MBH Industrial Limited | Construction | 2018 |
| MBH Industrial Properties Limited | Real estate | 2022 |
| Mbitrans Consulting Ltd | Information & communication | 2010 |
| Medo Skincare Ltd | Wholesale & retail | 2022 |
| Melrose Telecommunications Limited | Extraterritorial | 1997 |
| Meritek Computer Consultants Limited | Information & communication | 1996 |
| Metier Sound & Vision Limited | Information & communication | 2003 |
| Michael Richardson Associates Limited | Professional & scientific | 2021 |
| Mike Alsop Development Limited | Professional & scientific | 2012 |
| Milford & Dormor Solicitors LLP | | 2018 |
| Milkbere Property Limited | Real estate | 1963 |
| Millers Farm Shop Limited | Wholesale & retail | 2006 |
| Millers Farmshop Properties Ltd | Real estate | 2023 |
| Mitchell Gardens Management Limited | Households | 2015 |
| MJP Plumbing and Heating Services Limited | Construction | 2016 |
| MLR Trading Ltd | Wholesale & retail | 2018 |
| Moneysavvyness Ltd | Other services | 2021 |
| Monmouth Park Ltd | Construction | 2025 |
| Monster Grips Ltd | Administrative & support | 2021 |
| Moonlit.Market Retro Technologies Ltd | Manufacturing | 2026 |
| Moor Instruments EOT Limited | Professional & scientific | 2025 |
| Moorland Carpenters Limited | Construction | 2013 |
| Mountfield House Limited | Real estate | 2018 |
| MPR Property Management Ltd | Real estate | 2012 |
| Mrjb Limited | Wholesale & retail | 2010 |
| MSR Plumbing Supplies Ltd | Wholesale & retail | 2025 |
| Munchies Cakes Ltd | Wholesale & retail | 2014 |
| Musbury Garage Limited | Wholesale & retail | 2007 |
| MW Harrisons Ltd | Transport & logistics | 2022 |
| My Lettings (South West) Ltd | Real estate | 2013 |
| MYY Ltd | Construction | 2002 |
| N.I. & R.J. Herrod Limited | Hospitality | 2021 |
| Nebula Digital Cinema Limited | Information & communication | 2016 |
| Neon Marcomms Limited | Professional & scientific | 2007 |
| Neutral Futures CIC | Agriculture & fishing | 2024 |
| New Leaf Ecology Ltd | Professional & scientific | 2014 |
| Newenham Ground Works Limited | Households | 2024 |
| Newenham Restorations Limited | Manufacturing | 2024 |
| Newhow Limited | Wholesale & retail | 2025 |
| Next Phase Electrical Ltd | Construction | 2018 |
| NIP and Tuck (UK) Limited | Professional & scientific | 2005 |
| NO Toy Left Behind Community Interest Company | Wholesale & retail | 2021 |
| Norchfam Training Ltd | Education | 2024 |
| Nordic Spaces Invest Ltd | Construction | 2021 |
| Nordic Spaces Ltd. | Construction | 2020 |
| Nordic Spaces Properties Ltd | Construction | 2023 |
| Norton Woodwork Limited | Construction | 2010 |
| Norwegian Homes Leisure Limited | Construction | 2005 |
| Novella (KG) Ltd | Professional & scientific | 2021 |
| Nuco Tools Limited | Manufacturing | 2025 |
| Nurture in Nature Limited | Education | 2020 |
| Nurturing Tutors Limited | Education | 2026 |
| Nutriri Limited | Information & communication | 2018 |
| Oak Financial (South West) Limited | Financial services | 2007 |
| Oasa Rosa Aesthetics Ltd | Other services | 2022 |
| Ocean City Accommodation Limited | Hospitality | 2023 |
| Ocean Speed Limited | Professional & scientific | 1994 |
| Odysseus Security Risk Management Ltd | Administrative & support | 2015 |
| Okee Limited | Wholesale & retail | 2016 |
| Old Berts Limited | Professional & scientific | 2016 |
| Old Manor Lodge Shepherd Huts Ltd | Hospitality | 2024 |
| Olicana Book Group Limited | Financial services | 2025 |
| ON the Wire Productions CIC | Administrative & support | 2018 |
| ONL Online Limited | Wholesale & retail | 2021 |
| Onpointproperties Ltd | Real estate | 2019 |
| Opal Portal Ltd | Wholesale & retail | 2025 |
| Operational Metrics Limited | Professional & scientific | 2016 |
| Origin of Africa Ltd | Wholesale & retail | 2018 |
| Originn Limited | Professional & scientific | 2019 |
| Otter Energy Assets Limited | Energy | 2022 |
| Otter Energy Limited | Administrative & support | 2017 |
| Otter Homes Ltd. | Real estate | 1998 |
| Outsource Finance Directors Limited | Professional & scientific | 2026 |
| Ownercars Limited | Professional & scientific | 2026 |
| Oxlea Management Services Limited | Professional & scientific | 2009 |
| Oysstta Limited | Transport & logistics | 2022 |
| P & D H Property Ltd | Real estate | 2019 |
| P D Crabbe Building Contractor Ltd | Construction | 2014 |
| P&Lt Holdings Limited | Financial services | 2018 |
| Palakuzhayil Trading Company Ltd | Professional & scientific | 2025 |
| Pana Wellness Ltd | Other services | 2019 |
| Paradise Pines Limited | Hospitality | 2015 |
| PARKING4LESS Ltd | Other services | 2019 |
| Part and Company Limited | Administrative & support | 2008 |
| Pass and Joyce Limited | Information & communication | 2024 |
| Paul Hansford Limited | Construction | 2005 |
| Paul Vine Electrics Limited | Construction | 2002 |
| Paul Vine Limited | Wholesale & retail | 2017 |
| Paws & Pause Ltd | Other services | 2021 |