| Moorland Hall Ltd | Education | 2013 |
| Mordell Limited | Real estate | 1988 |
| Morris Bros.(Tavistock)Limited | Other services | 1959 |
| Mould Genie Ltd | Administrative & support | 2024 |
| Mount House School Trust Limited | Education | 1975 |
| Mount Kelly Enterprises Ltd | Education | 1980 |
| Mount Kelly Foundation Governors | Education | 1995 |
| Mount Kelly Overseas Limited | Education | 2016 |
| Mount Kelly Swimming Limited | Education | 2016 |
| Mount Tavy (Management) Limited | Households | 1983 |
| MR TIM Hookway Ltd | Health & social care | 2017 |
| Murmur Collective Ltd | Information & communication | 2021 |
| Mvware Ltd | Wholesale & retail | 2017 |
| Mystery Technologies Ltd | Information & communication | 2023 |
| N B Pitts Limited | Wholesale & retail | 2003 |
| Nash Chicks Ltd | Arts & recreation | 2018 |
| Nash Inc Limited | Administrative & support | 2011 |
| Nathan Mccarter Concepts Ltd | Construction | 2024 |
| Nathan Mccarter Joinery Ltd | Construction | 2019 |
| NCY 24 Limited | Hospitality | 2019 |
| Neuro Arete Limited | Health & social care | 2026 |
| New Generation Energy Ltd | Construction | 2004 |
| Nitrogin Ltd. | Manufacturing | 2017 |
| NM SW Limited | Hospitality | 2018 |
| NM Tavy Ltd | Hospitality | 2026 |
| NU Leaf (Tavistock) Limited | Administrative & support | 2025 |
| Number 58 Tavistock LLP | | 2016 |
| Numero Tredici Limited | Wholesale & retail | 2022 |
| Nurtured Education Ltd | Education | 2024 |
| O J Moore Builders Limited | Construction | 2018 |
| Off-Season World Ltd | Arts & recreation | 2024 |
| OH SO Sweet Tavistock Ltd | Hospitality | 2025 |
| Old Town Commerce Ltd | Wholesale & retail | 2021 |
| Omnis Business Services Ltd | Professional & scientific | 2013 |
| One Fish Street ST Ives Ltd | Hospitality | 2020 |
| One Made Earlier Ltd | Arts & recreation | 2022 |
| Ontor Limited | Professional & scientific | 2020 |
| Opas Growth Ltd | Wholesale & retail | 2025 |
| OPH (Holdings) Limited | Professional & scientific | 2012 |
| OPH Limited | Hospitality | 2003 |
| Optimum Coaching and Education Ltd | Education | 2023 |
| Opulentia Ltd | Real estate | 2022 |
| Orbin Ventures Ltd | Wholesale & retail | 2025 |
| Orchard Conservatories Windows and Doors Limited | Construction | 2009 |
| Orchard Court (Freehold) Company Limited | Households | 2006 |
| Ottery Park Limited | Real estate | 2020 |
| OUR Place Design Ltd | Professional & scientific | 2020 |
| Oursankalpa C.I.C. | Professional & scientific | 2017 |
| Oxford Medical Devices Limited | Professional & scientific | 2015 |
| P. J. Boucher Limited | Construction | 2002 |
| PAD Chapel Property Limited | Real estate | 2016 |
| Parishsurfsupply Ltd | Wholesale & retail | 2023 |
| Partners Hair Salon EST 2019 Limited | Other services | 2019 |
| Pattison Property's Southwest Limited | Real estate | 2024 |
| Peace Bond Ltd | Wholesale & retail | 2018 |
| Peak Academy Ltd | Education | 2019 |
| Peerless Payroll Ltd | Professional & scientific | 2018 |
| Pendragon (South West) Ltd. | Real estate | 2006 |
| Peninsula Custom Construction Limited | Construction | 2018 |
| Pension Property Investment Management Limited | Real estate | 2025 |
| Petch Properties Ltd | Administrative & support | 2019 |
| Petya Health Limited | Health & social care | 2021 |
| Phoenix Land Investment Limited | Professional & scientific | 2012 |
| Pilgrims Progress (Coaching) Limited | Health & social care | 2004 |
| Pilgrims Progress (Lettings) Limited | Real estate | 2016 |
| Pittstop Motor Services Ltd | Wholesale & retail | 2013 |
| Pixon Lane Developments Ltd | Construction | 2026 |
| Pixon Lane Garage Limited | Wholesale & retail | 2025 |
| PJ FOX Driver Hire Limited | Construction | 2024 |
| Plato Wellness Limited | Wholesale & retail | 2025 |
| Plymouth Home Care Limited | Health & social care | 2025 |
| Plymouth Pokestop UK Ltd | Wholesale & retail | 2025 |
| POD Training and Consultancy LLP | | 2011 |
| Port OUT Rigging Ltd | Information & communication | 2022 |
| PRD Holdings Ltd | Financial services | 2023 |
| PRD Property Holdings Ltd | Financial services | 2025 |
| Precision Fiber Ltd | Construction | 2024 |
| Price This Ltd | Wholesale & retail | 2025 |
| Private Line Ltd. | Information & communication | 1986 |
| Promet Consulting Ltd | Professional & scientific | 2010 |
| Putting on the Ritz Ltd | Other services | 2026 |
| Pyro Punk Pottery Ltd | Manufacturing | 2019 |
| Quasar Solutions Ltd | Administrative & support | 2007 |
| Quilt Direct Limited | Wholesale & retail | 2002 |
| Quither Properties Ltd | Real estate | 2017 |
| R 63 Consultants Limited | Wholesale & retail | 2018 |
| R and R Linen and Laundry Ltd | Administrative & support | 2026 |
| R J a Gardner Limited | Information & communication | 2014 |
| R Maitland Property Group Limited | Real estate | 2026 |
| R P Hutchins Holdings Ltd | Financial services | 2024 |
| Ramsham Farm Ltd | Agriculture & fishing | 2020 |
| Rayinspection Limited | Professional & scientific | 2024 |
| Real-Estate Land and Developments Limited | Real estate | 2020 |
| Realscape Systems Ltd | Information & communication | 2017 |
| Rebecca Garrett Media Limited | Professional & scientific | 2025 |
| Reef Passion Ltd | Wholesale & retail | 2020 |
| Regarding EVE Theatre CIC | Arts & recreation | 2021 |
| Renegade Holdings Ltd | Administrative & support | 2016 |
| Rentafford Ltd | Administrative & support | 2022 |
| Resonare Limited | Professional & scientific | 2025 |