| NT Cleaners Limited | Administrative & support | 2006 |
| NW Development UK Limited | Real estate | 2007 |
| O'Sullivan Reinforcing Services Limited | Construction | 2005 |
| Oblyt Ltd | Other services | 2001 |
| Oims Ltd | Professional & scientific | 2007 |
| Oncore Heating Limited | Construction | 2023 |
| One House Group Limited | Manufacturing | 2007 |
| Opalgrange Limited | Construction | 2002 |
| Orcina Limited | Mining & quarrying | 1986 |
| Orkadia Limited | Information & communication | 1999 |
| Ormsgill OFF Licence Limited | Wholesale & retail | 2003 |
| Orton Farmers Ltd | Wholesale & retail | 2003 |
| Orwin Oliver Ltd | Professional & scientific | 2004 |
| Ostara Limited | Real estate | 1982 |
| OUR World English Schools Limited | Education | 2008 |
| OUT of Eden Limited | Wholesale & retail | 1996 |
| Oxley Avionics Limited | Professional & scientific | 1976 |
| Oxley Developments Company Limited | Manufacturing | 1942 |
| Oxley Group Limited | Professional & scientific | 1969 |
| Oxley Systems Limited | Manufacturing | 1992 |
| Oxygen Brand Consulting Limited | Professional & scientific | 1999 |
| OZ Italia Ltd | Hospitality | 2026 |
| P & W Dawes Limited | Other services | 2003 |
| P a Hannah Heating and Plumbing Limited | Construction | 2003 |
| P D & B S Lawrence Limited | Agriculture & fishing | 2006 |
| P D Hutchinson Limited | Agriculture & fishing | 2002 |
| P.T. Lakes Ltd | Wholesale & retail | 2003 |
| P.W.T. Alarms Limited | Construction | 2005 |
| PA Graham Limited | Wholesale & retail | 2001 |
| Packhorse Steel Limited | Manufacturing | 2003 |
| Palace Cycles Limited | Wholesale & retail | 2005 |
| Pamela’S Pampered Pooches Limited | Other services | 2019 |
| Papercraft Connections Limited | Wholesale & retail | 2004 |
| Parkin Investments Limited | Real estate | 2005 |
| Pastures New (Health Foods) Limited | Hospitality | 2003 |
| Pattinson & Preston Limited | Real estate | 2005 |
| Paul Devlin Limited | Other services | 2001 |
| Paul Woodcock Limited | Construction | 2002 |
| Peak Performance Training and Development Limited | Professional & scientific | 2005 |
| Pear Tree Developments Lakes Limited | Construction | 2023 |
| Pearson & SON Limited | Construction | 2003 |
| Peastree Farm Limited | Agriculture & fishing | 2005 |
| Pennine Environmental Solutions Limited | Administrative & support | 2005 |
| Pennine Ways Lettings Limited | Real estate | 2007 |
| Pennine Ways Limited | Real estate | 2007 |
| Penny Bridge Hall Farms Limited | Agriculture & fishing | 2003 |
| Penrith VW Limited | Wholesale & retail | 2003 |
| Peter Bradshaw Limited | Construction | 2002 |
| Peter Williams Plumbing Limited | Construction | 2005 |
| Pgaw Limited | Transport & logistics | 2020 |
| Philip Metcalfe Limited | Construction | 2003 |
| Phillip Coates Decorating Services Limited | Construction | 2003 |
| Phsv Limited | Transport & logistics | 2021 |
| Piam Engineering Limited | Manufacturing | 1981 |
| Pitchford Properties Limited | Real estate | 2003 |
| PJ Tremaine Limited | Construction | 2001 |
| Playdale Playgrounds Limited | Manufacturing | 1953 |
| Ponteland Estates Limited | Real estate | 2006 |
| Poole Aquatic Limited | Extraterritorial | 1997 |
| Postlethwaites Limited | Wholesale & retail | 2003 |
| Povertyswap Limited | Health & social care | 2010 |
| Power Systems (E&C) Limited | Manufacturing | 2008 |
| Power World UK Ltd | Wholesale & retail | 2003 |
| Premier Pallets Limited | Manufacturing | 1994 |
| Pristine Hills Ltd | Real estate | 2025 |
| Proclaim Marketing Ltd | Transport & logistics | 2024 |
| Progression Solicitors Limited | Professional & scientific | 2005 |
| Prospero Limited | Agriculture & fishing | 2005 |
| Provincial Funding Ltd | Financial services | 2000 |
| Puzzling Place Limited | Wholesale & retail | 2000 |
| Q a Equipment Limited | Professional & scientific | 2003 |
| Quality Cleaning & Contracting Ltd | Administrative & support | 2003 |
| Quarry Brow Day Nursery Ltd | Administrative & support | 2004 |
| R & F Atkinson Limited | Transport & logistics | 2001 |
| R & J Brown Limited | Agriculture & fishing | 2002 |
| R & S Plant Sales Limited | Other services | 2001 |
| R & T Music Limited | Wholesale & retail | 2003 |
| R D Inns Ltd | Hospitality | 2000 |
| R S Properties Limited | Real estate | 1995 |
| R Todhunter & SON Limited | Agriculture & fishing | 2000 |
| R. N. Chicken Limited | Manufacturing | 2002 |
| R.L.Brooks Limited | Wholesale & retail | 1963 |
| R.S Contracting Ltd | Administrative & support | 2006 |
| R.S. Morphet Limited | Wholesale & retail | 1967 |
| R.T.S.N. Huddart Supplies Limited | Wholesale & retail | 2003 |
| Rachel Winter Ltd | Other services | 2006 |
| Raemore Developments Limited | Construction | 2001 |
| RAR Property Investments Limited | Real estate | 2010 |
| Ratherheath Lane Ltd | Hospitality | 2002 |
| Rawling Builders Limited | Construction | 2002 |
| Rayrigg Estates Ltd | Real estate | 2001 |
| Red Oak Direct Limited | Wholesale & retail | 2003 |
| Red Raven Design Ltd. | Information & communication | 2002 |
| Refcom Limited | Administrative & support | 1999 |
| Regal MOT Centre Limited | Manufacturing | 2001 |
| Reid Taylor Limited | Real estate | 2003 |
| Rethink Development Limited | Administrative & support | 2006 |
| Review the Haircutters Ltd | Other services | 2003 |
| REX Food Ltd | Hospitality | 2022 |
| RGM Norton Limited | Wholesale & retail | 2002 |