| MKW Bookkeeping Ltd | Professional & scientific | 2011 |
| MKW Publishing Limited | Information & communication | 2010 |
| ML Consultancy Services Limited | Professional & scientific | 2016 |
| MO2U Community Interest Company | Arts & recreation | 2024 |
| Mobile Stadiums Ltd | Administrative & support | 2020 |
| Monkey Composites Limited | Manufacturing | 2017 |
| Monsal Trail Limited | Wholesale & retail | 2011 |
| Moorhen Holdings Limited | Professional & scientific | 2000 |
| Moorstone Community Care Limited | Health & social care | 2024 |
| Moorstone Grove Propco Limited | Real estate | 2021 |
| Moorstone Holdings Limited | Health & social care | 2021 |
| Moorstone Opco Limited | Health & social care | 2017 |
| Moorstone Penns Propco Limited | Real estate | 2019 |
| Moorstone Propco Limited | Real estate | 2017 |
| Moorstone York Opco Limited | Health & social care | 2018 |
| Moorstone York Propco Limited | Real estate | 2018 |
| Moorstone Zebra Limited | Real estate | 2024 |
| Morans Limited | Hospitality | 2009 |
| Morgan Wilton Properties Limited | Hospitality | 2016 |
| Morris Developments (Chesterfield) Ltd | Real estate | 2013 |
| Moscar Farm Limited | Agriculture & fishing | 2012 |
| MRS Tiggy Winkles Ltd | Wholesale & retail | 2025 |
| Munster Earthworx Limited | Administrative & support | 2018 |
| Mypeakevent Ltd | Hospitality | 2024 |
| N C Joinery Ltd | Construction | 2011 |
| N R Hickman Limited | Financial services | 2004 |
| N X U Limited | Hospitality | 2018 |
| N X U Properties Limited | Real estate | 2018 |
| N(Code) Digital Limited | Information & communication | 2015 |
| NC12 Properties Ltd | Real estate | 2018 |
| NC12 Turtle Bay Limited | Real estate | 2020 |
| Nelop Systems Limited | Information & communication | 2010 |
| Network Consultancy Associates | | 1992 |
| New Close Farm Limited | Agriculture & fishing | 1986 |
| Nextdoor Services Limited | Other services | 2016 |
| Nichols Investments Ltd | Other services | 2019 |
| Noonah Holdings Limited | Financial services | 2016 |
| Noonah Marketing Limited | Administrative & support | 2011 |
| Norse Restaurant Ltd | Hospitality | 2024 |
| Northwood Investments (UK) Limited | Professional & scientific | 2008 |
| Novantia Limited | Extraterritorial | 2015 |
| NSA Motorcycles Limited | Wholesale & retail | 2010 |
| Nutrition Wholesale Ltd | Wholesale & retail | 2018 |
| Oak & Stone Heritage Ltd | Construction | 2011 |
| Old Methodist Church RTM Company Limited | Households | 2022 |
| Olscon Limited | Professional & scientific | 2017 |
| Optimum Healthcare Solutions (Fulwood) Limited | Professional & scientific | 2016 |
| Oslomond Limited | Construction | 2012 |
| Oulsnam Design Limited | Professional & scientific | 1997 |
| Oulsnam Projects Group Ltd | Extraterritorial | 2018 |
| P M Cars Limited | Professional & scientific | 1973 |
| P M Tractors Limited | Professional & scientific | 1971 |
| P M Trucks Limited | Professional & scientific | 1972 |
| P.J Wrieden Limited | Other services | 2003 |
| P.W. Tanking Services Ltd | Water & waste | 2020 |
| Palmito Property Ltd | Real estate | 2025 |
| PAR 6 Limited | Professional & scientific | 2003 |
| Paradigm Corporate Rescue Limited | Administrative & support | 1998 |
| Park Farm (Ashford) Limited | Real estate | 2012 |
| Parkhead Property Services Limited | Real estate | 2024 |
| Parry Engineering Geological Services Limited | Professional & scientific | 2013 |
| Pasties and Puddings Limited | Other services | 2019 |
| Payne Landscapes Limited | Administrative & support | 2003 |
| PCS Contract Cleaning Services Limited | Administrative & support | 2008 |
| Peacock Hotel (Baslow) Limited | Hospitality | 1964 |
| Peak Aggregates Limited | Mining & quarrying | 2021 |
| Peak Ales Limited | Manufacturing | 2015 |
| Peak Associates Limited | Administrative & support | 2005 |
| Peak Case Management Ltd | Health & social care | 2023 |
| Peak Commercial Properties Limited | Real estate | 1980 |
| Peak District Alpacas Ltd | Agriculture & fishing | 2020 |
| Peak District Counselling Limited | Education | 2018 |
| Peak District Enterprises Ltd | Professional & scientific | 2009 |
| Peak District Lettings Ltd | Real estate | 2009 |
| Peak District Supplies Ltd | Wholesale & retail | 2014 |
| Peak District Yoga Studio Limited | Other services | 2025 |
| Peak Dyslexia Limited | Other services | 2024 |
| Peak Engineers Ltd | Administrative & support | 2014 |
| Peak Engineers Sport Ltd | Administrative & support | 2021 |
| Peak Inside Ltd | Other services | 2019 |
| Peak Inside Properties Limited | Real estate | 2023 |
| Peak Kitchens & Appliances Limited | Wholesale & retail | 2024 |
| Peak Lines Ltd | Education | 2021 |
| Peak Plant Supports Limited | Other services | 2011 |
| Peak Properties (U.K) Limited | Other services | 1998 |
| Peak PUB Co Ltd | Hospitality | 2023 |
| Peak Soap Ltd | Manufacturing | 2018 |
| Peak Venues Ltd | Extraterritorial | 2015 |
| Peakland Cycles Ltd | Wholesale & retail | 2017 |
| Peakland Leisure Limited | Hospitality | 2003 |
| Peaktiles Limited | Manufacturing | 2024 |
| Peaky Properties Ltd | Households | 2025 |
| Pebbles Performance Limited | Other services | 2020 |
| Pecorino Limited | Manufacturing | 2023 |
| Peejay Enterprises Limited | Wholesale & retail | 2003 |
| Penelope Thornton Hotels Limited | Hospitality | 1997 |
| Penns Mount Limited | Health & social care | 2001 |
| People Project Consulting Limited | Administrative & support | 2019 |
| Peppery Limited | Professional & scientific | 2016 |
| Performance Motorsport Wiring Ltd | Manufacturing | 2022 |