| MR Duff Potash Co. Ltd | Financial services | 2012 |
| MSK Londonay Ltd | Construction | 2024 |
| MT Properties (Whitby) Ltd | Real estate | 2025 |
| MTR Autotech Ltd | Wholesale & retail | 2015 |
| Muir LEA Management Company Limited | Real estate | 2003 |
| Mulgrave Community Sports Association | Arts & recreation | 2004 |
| Mulgrave Estate (Ellerby) LLP | | 2012 |
| Mulgrave Estate Limited | Extraterritorial | 2011 |
| Mulgrave Farm Limited | Professional & scientific | 2006 |
| Musicport Festival Limited | Arts & recreation | 2023 |
| Mwcf Limited | Professional & scientific | 2006 |
| Mythos Whitby Limited | Hospitality | 2025 |
| N R Pybus Ltd | Construction | 2001 |
| N.S.Training.Management Limited | Hospitality | 2025 |
| Nano Time Limited | Professional & scientific | 2005 |
| Natures Laboratory Limited | Wholesale & retail | 2002 |
| Naturkraft Pathways Ltd | Health & social care | 2026 |
| NBV Limited | Information & communication | 2003 |
| NC Plastering & Rendering Limited | Construction | 2013 |
| Nemoss Ltd | Hospitality | 2022 |
| New Rose Adventures Limited | Hospitality | 2017 |
| Newton Architects & Designers Limited | Professional & scientific | 2012 |
| Newton Moor Farms Ltd | Mining & quarrying | 2012 |
| Nigel Parkes Builders Limited | Construction | 2017 |
| Nine Wellington Properties Ltd | Households | 2010 |
| Ninny's Tea and Cake Limited | Hospitality | 2022 |
| Noel Barrett Legal Services Limited | Other services | 2017 |
| Noel Barrett Solicitor Limited | Professional & scientific | 2017 |
| North East E-Cigs Ltd | Wholesale & retail | 2013 |
| North East Fishing Vessels Limited | Agriculture & fishing | 2008 |
| North Lettings Ltd | Real estate | 2023 |
| North Riding Engineering Limited | Professional & scientific | 2019 |
| North Sea Research Ltd | Professional & scientific | 2021 |
| North West Diagnostic Imaging Limited | Health & social care | 2025 |
| North Yorkshire Medicals Limited | Health & social care | 2021 |
| North Yorkshire Moors Company Limited | Extraterritorial | 2000 |
| Northernbird Estates Ltd | Construction | 2023 |
| Northmore Webb Properties Limited | Real estate | 2015 |
| Nrsmith Properties Ltd | Real estate | 2023 |
| O'Donnell Construction Limited | Wholesale & retail | 1986 |
| Ocean Road Management (Whitby) Limited | Real estate | 1998 |
| OFF the Scale Castleton Ltd | Wholesale & retail | 2021 |
| OG (2016) Ltd | Information & communication | 2016 |
| OK Kaye Limited | Professional & scientific | 2018 |
| Oliver Blue Ltd | Other services | 2016 |
| ONE88 Lettings Ltd | Real estate | 2019 |
| Onetap Group Ltd | Administrative & support | 2024 |
| Online Emporium (Whitby) Ltd | Wholesale & retail | 2020 |
| Ooto Properties Ltd | Real estate | 2023 |
| Orchard Estates (Goathland) Limited | Agriculture & fishing | 1996 |
| Orchid Summit LLP | | 2026 |
| Otherberry Ltd | Hospitality | 2021 |
| Outlet Store Whitby 2 Ltd | Wholesale & retail | 2024 |
| Outlet Store Whitby Ltd | Wholesale & retail | 2023 |
| Outstanding Care Consultancy Limited | Professional & scientific | 2019 |
| OWL House Studios Limited | Information & communication | 2014 |
| Own Studio Ltd | Information & communication | 2018 |
| P & M (Ramsdale) Ltd | Financial services | 2013 |
| P&De Bell Ltd | Professional & scientific | 2023 |
| P.M. Straw (Builders) Ltd | Construction | 2002 |
| Pacd Properties Limited | Real estate | 2025 |
| Pads (Whitby) Limited | Financial services | 2020 |
| Palomino Coffee Limited | Hospitality | 2022 |
| Pandemonium Whitby Limited | Wholesale & retail | 2025 |
| Park Terrace Associates Limited | Households | 2012 |
| Park Vale Court Management Company Limited | Real estate | 2005 |
| Parkdown Minerals Limited | Real estate | 2012 |
| Parkes Builders Limited | Construction | 2010 |
| Parkes Construction (Whitby) Ltd | Construction | 2017 |
| Parkin & Co. Ltd | Wholesale & retail | 2017 |
| Parkin Property Ltd | Real estate | 2024 |
| Parkol Marine Engineering Ltd | Manufacturing | 2000 |
| Parkol Marine Holdings Limited | Professional & scientific | 2019 |
| Partridge Nest Holidays Ltd | Hospitality | 2024 |
| PAS Scaffolding Limited | Construction | 2004 |
| PAT a Cake Ltd | Manufacturing | 2019 |
| Paul Collinson Ltd | Wholesale & retail | 2021 |
| Pawfect Pooches Ltd | Other services | 2020 |
| PB Civils Limited | Construction | 2023 |
| PBL Land Group Ltd | Real estate | 2026 |
| PBL Plant Ltd | Construction | 2026 |
| Peak Words Ltd | Professional & scientific | 1993 |
| Pernet Consulting Ltd | Agriculture & fishing | 2025 |
| Philip Burley & Co Accountants Ltd | Professional & scientific | 2022 |
| Pickering Container Hire Ltd | Administrative & support | 2024 |
| Pickering Storage Ltd | Administrative & support | 2024 |
| Pickering Traction Engine Rally Ltd | Arts & recreation | 2024 |
| PIE in the Sky Whitby Ltd | Real estate | 2024 |
| PKS (Whitby) Ltd | Professional & scientific | 2017 |
| Plough Inn Sleights Limited | Hospitality | 2024 |
| Plough Sleights Hospitality Limited | Hospitality | 2026 |
| Pooltown Dent Ltd | Health & social care | 2025 |
| Porto Pizza NE Ltd | Hospitality | 2023 |
| Portway Property Consultants Limited | Real estate | 2013 |
| PR Roofing Whitby Limited | Construction | 2020 |
| Pro Shod Ltd | Professional & scientific | 2015 |
| Procontrol Limited | Administrative & support | 2011 |
| Prodigy Roofing and Building Limited | Construction | 2021 |
| Professional and Caring Property LLP | | 2019 |
| Professional Designs Limited | Real estate | 2004 |