| Number Two Royal Crescent Whitby Management Company Limited | Households | 2002 |
| Nyangoro TM Ltd | Construction | 2025 |
| Nymr PLC | Manufacturing | 1990 |
| O Preece TM Ltd | Construction | 2024 |
| Oak Brewery Company Limited(The) | Extraterritorial | 1946 |
| Oakdale Consultancy Services Limited | Professional & scientific | 2003 |
| Oakdale Golf Club (Harrogate) Limited | Arts & recreation | 1914 |
| Oakscliff | Hospitality | 1958 |
| Oates Building Company Limited | Construction | 2005 |
| Ogden of Harrogate Limited | Wholesale & retail | 1981 |
| Old Forge Motors Limited | Wholesale & retail | 2006 |
| Omar (Harrogate) Limited | Wholesale & retail | 1946 |
| On-Site Archaeology Limited | Construction | 1999 |
| Opus Energy (Corporate) Limited | Energy | 2004 |
| Opus Energy Group Limited | Financial services | 2002 |
| Opus Energy Limited | Energy | 2002 |
| Opus Energy Renewables Limited | Energy | 2010 |
| Opus GAS Limited | Energy | 2006 |
| Opus GAS Supply Limited | Energy | 2009 |
| Opus Water Limited | Extraterritorial | 2015 |
| Orbitra International Ltd | Wholesale & retail | 2026 |
| Oriel House (Scarborough) Management Company Limited | Households | 2006 |
| Osbaldwick Fisheries & Co Ltd | Hospitality | 2002 |
| Othalusala TM Ltd | Construction | 2025 |
| Ousegate Builders Limited | Construction | 1970 |
| Over the Air to YOU Limited | Information & communication | 2003 |
| Owls Holdings Limited | Financial services | 2026 |
| Oxton Estate | Extraterritorial | 1993 |
| Oxton Farm | Agriculture & fishing | 1950 |
| P H Machin Limited | Construction | 2003 |
| P R Fullerton Limited | Construction | 2002 |
| P Sturdy Joinery Ltd | Construction | 2007 |
| P. J. Raines Limited | Professional & scientific | 2003 |
| P. Mcginty (Cladding) Limited | Construction | 2006 |
| P.A. Thorpe (Vehicle Components) Limited | Manufacturing | 1977 |
| P.S. Design Group Limited | Professional & scientific | 1990 |
| P.W.Archer and SON Limited | Transport & logistics | 1946 |
| Paracelly Limited | Professional & scientific | 2007 |
| Parkhouse Management Company (Harrogate) Limited | Households | 1994 |
| Parkinson Research Solutions Ltd | Professional & scientific | 2014 |
| Paul a Beal Ltd | Construction | 2003 |
| Paul Garland Limited | Wholesale & retail | 2003 |
| Paul Jarvis Ltd | Wholesale & retail | 2003 |
| Pavilion Square (Scarborough) Limited | Extraterritorial | 1961 |
| Pennita Limited | Wholesale & retail | 2006 |
| Persimmon Developments (NO 6) Limited | Extraterritorial | 2007 |
| Persimmon Developments (NO 7) Limited | Extraterritorial | 2007 |
| Pestguard Limited | Administrative & support | 1993 |
| Peter Easton Plumbing & Heating Limited | Energy | 2000 |
| Peter Reineck Associates Limited | Professional & scientific | 2005 |
| Peter Rhodes Feed Services Limited | Agriculture & fishing | 2006 |
| Peterton Grove Limited | Real estate | 2003 |
| Philip Burley (Whitby) Limited | Professional & scientific | 2002 |
| Philip Makin Transport Limited | Transport & logistics | 2001 |
| Phillipe's Bakery Limited | Manufacturing | 2002 |
| Phwsg Ltd | Wholesale & retail | 2026 |
| Pickersgill Consultancy & Planning Limited | Professional & scientific | 1990 |
| Pinfold Mews (York) Management Co Limited | Households | 1983 |
| Pinnacle Roofline Limited | Construction | 2002 |
| PJ Hunt Limited | Professional & scientific | 2005 |
| PJI Contracting Services Limited | Information & communication | 2004 |
| Placelease Property Management Limited | Households | 1991 |
| Placeteam (EU) Limited | Professional & scientific | 2007 |
| Planet Pharma Group Limited | Information & communication | 2021 |
| Plumb Tech (Cleveland) Ltd | Construction | 2004 |
| Plusmark Services Limited | Hospitality | 1999 |
| Pluspure Public Limited Company | Extraterritorial | 1988 |
| Porter & Tate Limited | Construction | 2007 |
| Power Plastics Limited | Manufacturing | 2001 |
| Premier Window Cleaners Limited | Administrative & support | 2006 |
| Premium Pack Trading Co Ltd | Wholesale & retail | 2026 |
| Prestige Performance (Yorkshire) Ltd | Wholesale & retail | 2007 |
| Prestige World Wide Travel Ltd | Administrative & support | 2001 |
| Pro Shine Professional Cleaning Services Limited | Administrative & support | 1997 |
| Pro-Pak Foods Limited | Manufacturing | 1998 |
| Proberts & Sons Limited | Professional & scientific | 2007 |
| Profitmax Limited | Professional & scientific | 1998 |
| Projectsky Property Management Limited | Households | 1990 |
| Promatec Limited | Manufacturing | 1997 |
| Property 4-FAST-SALE Limited | Real estate | 2006 |
| Prosperity Financial Management Limited | Financial services | 2003 |
| Providence Holdings Limited | Professional & scientific | 2004 |
| PW Property Holdings Limited | Real estate | 2001 |
| Pyramid Construction & Maintenance Limited | Wholesale & retail | 2006 |
| QPS Plastics Limited | Manufacturing | 2001 |
| Quality Engineering Group Company Ltd | Professional & scientific | 2026 |
| Quantum Arbiter Limited | Professional & scientific | 1997 |
| Quantum Projects Limited | Professional & scientific | 2001 |
| Quorn Foods Limited | Manufacturing | 2016 |
| Quotemass Limited | Households | 1988 |
| R & M Gaskarth | Hospitality | 1928 |
| R & S Marton Limited | Agriculture & fishing | 2003 |
| R a Wheeler Limited | Construction | 2004 |
| R D Landscapes & Design Ltd | Administrative & support | 2021 |
| R H Thompson & SON Ltd | Agriculture & fishing | 2003 |
| R Moore & SON Limited | Construction | 2006 |
| R N Verity Limited | Agriculture & fishing | 2006 |
| R R Mackley Limited | Agriculture & fishing | 2006 |
| R.S.T. JAY Limited | Construction | 1998 |
| Racehigh Property Management Limited | Households | 1984 |