| Mollusc Property (Corsham) Limited | Households | 2018 |
| Monksley Limited | Arts & recreation | 2020 |
| Monroir Ltd | Wholesale & retail | 2025 |
| Monstera Visual Limited | Other services | 2019 |
| Montague House (Bath) Management Limited | Households | 1991 |
| Munchkins Lettings Ltd | Real estate | 2024 |
| MV Packaging Limited | Manufacturing | 2001 |
| My Lake Como Wedding Limited | Administrative & support | 2014 |
| Myads Solutions Ltd | Professional & scientific | 2013 |
| N C Architects Partners LLP | | 2014 |
| Najuk Limited | Financial services | 2010 |
| Napfisheries Limited | Information & communication | 2002 |
| Natural Steps Coaching and Consultancy Ltd | Other services | 2022 |
| Neale Court Limited | Households | 2012 |
| Neon Surveys Ltd | Professional & scientific | 2012 |
| Neston Gardens Management Company Limited | Households | 2019 |
| Nestwell Property Management Limited | Real estate | 2024 |
| Netguard Limited | Information & communication | 2009 |
| Neutralgrey Ltd | Health & social care | 2025 |
| New Access (East Anglia) Limited | Wholesale & retail | 2011 |
| New Kulcha Ltd | Manufacturing | 2024 |
| New Leaf Farm Limited | Hospitality | 2020 |
| Nigel J Unwin Limited | Other services | 2011 |
| Nizzero Consulting Ltd | Professional & scientific | 2020 |
| NKS Bath Ltd | Households | 2018 |
| NO.3 the Deli Ltd | Hospitality | 2021 |
| Noko Construction Ltd | Manufacturing | 2022 |
| Norbin Farm Limited | Agriculture & fishing | 2008 |
| Norman E. Webb Transport Services Limited | Wholesale & retail | 1998 |
| Northanger Court Limited | Households | 1990 |
| Notre Dame Doors Ltd | Other services | 2023 |
| Novaclay Limited | Health & social care | 2023 |
| Novarc UK Limited | Financial services | 2018 |
| NTN Catering & Electrical Services Ltd | Manufacturing | 2011 |
| Nudge Invest Limited | Financial services | 2019 |
| Nudge Nutrition Limited | Extraterritorial | 2011 |
| Nurtured Gardens Limited | Administrative & support | 2014 |
| Nutshell Research Limited | Professional & scientific | 2021 |
| Oakwood Recovery Limited | Transport & logistics | 2008 |
| Oakwrights Bath Ltd | Manufacturing | 2003 |
| Oarbridge Ltd | Professional & scientific | 2026 |
| Octavian Wine Services Limited | Transport & logistics | 2011 |
| Office Clearance Wiltshire Limited | Extraterritorial | 2013 |
| Old Orchard (Bath) Management Limited | Households | 1991 |
| Ollie COX Productions Limited | Information & communication | 2005 |
| Omenfang Ltd | Health & social care | 2012 |
| Omniview Inc Ltd | Information & communication | 2025 |
| Oriten Limited | Information & communication | 2025 |
| Oscar Windebanks Timber Limited | Wholesale & retail | 2019 |
| Outset Mind Ltd | Health & social care | 2023 |
| Overmoor Limited | Real estate | 1994 |
| Overnhill Court (NO. 1) Limited | Households | 1970 |
| Oxygen Therapy South West Ltd | Health & social care | 2024 |
| P & S Rawlings Horse Transport Limited | Administrative & support | 2007 |
| P J Hubbard Ltd | Wholesale & retail | 2016 |
| P M-Mendes (International) Limited | Wholesale & retail | 1977 |
| P&B Weir Electrical Limited | Manufacturing | 2016 |
| Panacea Holdings Limited | Financial services | 2016 |
| Panagora Consulting Ltd | Financial services | 2007 |
| Panagora Holdings Limited | Professional & scientific | 2011 |
| Panagora Trading Limited | Wholesale & retail | 2012 |
| Park Lane Press Limited | Manufacturing | 1998 |
| Parkside Scanning Services LLP | | 2017 |
| Parkwhat Management Company Ltd | Households | 2025 |
| Paul Marshall Ltd | Administrative & support | 2013 |
| Peacock Court Bences Lane Ltd | Households | 2016 |
| Peahen Publishing Ltd | Information & communication | 2015 |
| Peaks Healthcare Limited | Health & social care | 2023 |
| Peppercombe Management Company Limited | Households | 2018 |
| Pepperpot Events Limited | Hospitality | 2005 |
| PER Mare - ROV Services Ltd | Professional & scientific | 2016 |
| Perchard Structural Timberworks Ltd | Construction | 2017 |
| Perfect Eyes Group Limited | Extraterritorial | 2025 |
| Perfect Eyes Ltd. | Health & social care | 2012 |
| Perfect Skin Studio Limited | Wholesale & retail | 2023 |
| Perfect Stays Bath Ltd | Real estate | 2023 |
| Perry Holdings Limited | Real estate | 1993 |
| Peter Gabriel Limited | Information & communication | 1973 |
| Peter MAY Bovine Health and Reproduction Limited | Real estate | 2012 |
| Pettemerides Personal Training Ltd | Arts & recreation | 2016 |
| PG Productions Limited | Information & communication | 2010 |
| Pharmaxo Limited | Extraterritorial | 2023 |
| Pharmaxo Pharmacy Services Limited | Wholesale & retail | 2009 |
| Phoenix ALL Care Ltd | Public administration | 2020 |
| Pick ME UP Bouquet Limited | Transport & logistics | 1990 |
| Pickwick Academy Trust | Education | 2011 |
| Pickwick Clinical Ltd | Health & social care | 2025 |
| Pickwick Management Company (Corsham) Limited | Households | 2019 |
| Pinckney Green Fireplaces Limited | Manufacturing | 2004 |
| PIP & Crown Rural Solutions Ltd | Agriculture & fishing | 2022 |
| Pitfield Properties Ltd | Real estate | 2023 |
| PJB Property Management Ltd | Real estate | 2023 |
| PJW Consultancy Limited | Information & communication | 1993 |
| Plant.Eat.Licious Green PUB Ltd | Hospitality | 2023 |
| Playargentina Sport and Travel Ltd | Administrative & support | 2020 |
| Plots 1 - 7 Kingston Farm Limited | Real estate | 2017 |
| Plots 116 - 122 Kingston Farm Management Company Limited | Households | 2019 |
| Plots 132 - 138 Kingston Farm Management Company Limited | Real estate | 2019 |
| Pool World (Wessex) Ltd | Construction | 2006 |
| Porters Mead Management Company Limited | Households | 2005 |