| Minor Travel Ltd | Transport & logistics | 2022 |
| Mint Plum Limited | Construction | 2020 |
| Mirzaei Nield Ltd | Professional & scientific | 2025 |
| MJ Hpps Ltd | Construction | 2004 |
| MKI Finishes Ltd | Construction | 2024 |
| Mobility People International Recruitment Limited | Administrative & support | 2010 |
| Mogers Drewett Investments LLP | | 2021 |
| Mogers Drewett LLP | | 2009 |
| Mogers Drewett Services Limited | Administrative & support | 2017 |
| Molior Architects Ltd | Professional & scientific | 2018 |
| Monocle of Sherborne Ltd | Construction | 2019 |
| Montague Gardens Management Company Limited | Households | 1989 |
| Mooncalf Ltd | Information & communication | 2025 |
| More Professional Solutions Limited | Extraterritorial | 2005 |
| Morning Munch Ltd | Hospitality | 2025 |
| Morts & Dorts Limited | Hospitality | 2007 |
| Mount Sandford LVA LLP | | 2022 |
| Moviola Limited | Information & communication | 2004 |
| MP Renewable Consultancy Ltd | Professional & scientific | 2022 |
| MS Crabb Limited | Agriculture & fishing | 2003 |
| MUG & Barrel Ltd | Hospitality | 2025 |
| Mulberry Bistro Limited | Real estate | 2006 |
| Munden House Limited | Hospitality | 2011 |
| Muntanya Ltd | Wholesale & retail | 2018 |
| Musgrove Willows Limited | Agriculture & fishing | 2010 |
| MWP Data Solutions Ltd | Information & communication | 2025 |
| Mxmg Ltd | Information & communication | 2019 |
| Mylor Bridge LVA LLP | | 2015 |
| N Mogridge Ltd | Manufacturing | 2017 |
| N. F. S. Coaching Ltd | Education | 2023 |
| Nailsea Block 2 LVA LLP | | 2014 |
| Nailsea 4 East LVA LLP | | 2019 |
| Nailsea Block 1 LVA LLP | | 2014 |
| Nailsea Block 3 LVA LLP | | 2015 |
| Nailsea Holdings LVA LLP | | 2014 |
| Nameline Limited | Professional & scientific | 2017 |
| Nanna Moons Cafe Limited | Hospitality | 2015 |
| NAS Construction Ltd | Construction | 2022 |
| Natalia COX Ltd | Other services | 2019 |
| Naturally Inspired Skincare Ltd | Financial services | 2019 |
| Negative Space Design Ltd | Professional & scientific | 2017 |
| Neonlake Limited | Extraterritorial | 2007 |
| Neopath Ltd | Information & communication | 2025 |
| Nest Seeker Estates Ltd | Households | 2024 |
| Neurofounders Hub CIC | Professional & scientific | 2026 |
| New Leaf Trading Ltd | Hospitality | 2014 |
| New Sherborne Nails Ltd | Other services | 2026 |
| Newcourse Healthcare Ltd | Professional & scientific | 2018 |
| Newlifes Catering Ltd | Wholesale & retail | 2020 |
| Newquay LVA LLP | | 2020 |
| Newton & DYL Interiors Ltd | Wholesale & retail | 2026 |
| Newton Stovold Associates Limited | Wholesale & retail | 2006 |
| NG Interim Finance Limited | Professional & scientific | 2016 |
| Niris Murray Limited | Real estate | 2017 |
| Nmmb Limited | Professional & scientific | 2023 |
| Nominees of Sigma Limited | Professional & scientific | 1999 |
| Norah FRY (CP) Limited | Households | 2015 |
| Norah FRY (Shepton Mallet) Limited | Households | 2005 |
| North Curry LVA LLP | | 2017 |
| North Petherton LVA LLP | | 2019 |
| Northam LVA LLP | | 2017 |
| NPB Developments Limited | Real estate | 2016 |
| NPB Holdings Ltd | Financial services | 2019 |
| NSP Stores Ltd | Wholesale & retail | 2014 |
| Number 6 Boutique Limited | Wholesale & retail | 2019 |
| NYB Medical Limited | Information & communication | 2025 |
| Nystart Limited | Professional & scientific | 2011 |
| O'Brien Commercial Management Ltd | Professional & scientific | 2015 |
| O3 Biotechnology Limited | Professional & scientific | 2012 |
| Oak and Ivory Estates Ltd | Real estate | 2026 |
| Oakmount Investments Ltd | Real estate | 2018 |
| Oborne House Management Company Limited | Households | 2024 |
| Obsession PR Limited | Professional & scientific | 2010 |
| Offpiste Theatre Ltd | Arts & recreation | 2020 |
| Og-Engineering Limited | Manufacturing | 2024 |
| Ogilvy & More Events Limited | Hospitality | 2025 |
| Ogilvy & More Property Limited | Real estate | 2025 |
| OH Daisy Limited | Wholesale & retail | 2025 |
| Old Barn Framing Gallery Limited | Manufacturing | 2009 |
| Old OX Inn Community CIC | Arts & recreation | 2026 |
| Oliver Leech Architects Limited | Administrative & support | 2017 |
| Olpol & Co Limited | Professional & scientific | 2020 |
| Omina Jpeg Ltd | Professional & scientific | 2019 |
| On-Reflection Mirrors Limited | Wholesale & retail | 2003 |
| One MAN & HIS Mower Limited | Professional & scientific | 2009 |
| Opstel Professional Solutions Limited | Information & communication | 1997 |
| Orchard Architects Ltd | Professional & scientific | 2022 |
| Origin Immersive Ltd | Hospitality | 2026 |
| Original Landscapes Limited | Construction | 2002 |
| Orso Capital Limited | Professional & scientific | 2020 |
| Osprey Hovercraft Limited | Manufacturing | 2021 |
| OUR Field Ltd | Professional & scientific | 2025 |
| Own Brand Ltd | Professional & scientific | 2018 |
| Oxygen Wellbeing Ltd | Health & social care | 2022 |
| P W & a S L Hunt Ltd | Agriculture & fishing | 2014 |
| P&B Investments Limited | Real estate | 2015 |
| P&C Hawkins Ltd | Professional & scientific | 2016 |
| P.J. Brake Developments Limited | Construction | 1982 |
| Paintball Massacre Ltd | Information & communication | 2018 |
| Pakhar Limited | Extraterritorial | 2010 |