| Protective Intelligence Limited | Information & communication | 2004 |
| Proteus Communications Group LLP | | 2018 |
| Proteus Environmental Communications Limited | Professional & scientific | 1996 |
| Proteus Environmental Services Limited | Professional & scientific | 1996 |
| Proteus Public Relations Limited | Professional & scientific | 1996 |
| Protile&Clean Limited | Administrative & support | 2025 |
| Proto-Machine Limited | Manufacturing | 2003 |
| Proton Scientific Ltd | Wholesale & retail | 2018 |
| Protutor Ltd | Professional & scientific | 2014 |
| Proud Builders Limited | Construction | 2003 |
| Proud Management Ltd | Professional & scientific | 2017 |
| Prounity Ltd | Wholesale & retail | 2026 |
| PRS Auto Services Ltd | Wholesale & retail | 2024 |
| Pryde Consultancy Ltd | Information & communication | 2021 |
| Prze MOC Ltd | Wholesale & retail | 2025 |
| PSJ Legal Limited | Financial services | 2024 |
| Psychavia Limited | Transport & logistics | 1983 |
| PT Talent Solutions Ltd | Administrative & support | 2022 |
| Public Car Sales Ltd | Wholesale & retail | 2025 |
| Public Sector Performance Ltd | Professional & scientific | 2022 |
| PUD & PIN Ltd | Financial services | 2021 |
| Puddingface Ltd | Hospitality | 2009 |
| Puddletown LLP | | 2011 |
| PUK S.R.L Ltd | Transport & logistics | 2024 |
| Pullen Cables Limited | Construction | 2022 |
| Pulse Medical Group Ltd | Health & social care | 2024 |
| Punafuticouriers Ltd | Transport & logistics | 2025 |
| Pure Creations Enterprises Ltd | Professional & scientific | 2012 |
| Pure Gardens Limited | Administrative & support | 2025 |
| Pure Investments Limited | Other services | 2004 |
| Pure UK International Ltd | Wholesale & retail | 2024 |
| Purely Waste Solutions Ltd | Water & waste | 2018 |
| Purevita Ltd | Wholesale & retail | 2024 |
| Purgatory Tattoos Ltd | Other services | 2025 |
| Puro Casting Ltd | Administrative & support | 2022 |
| Purple Architecture Studio Limited | Professional & scientific | 2010 |
| Purple Dove Recruitment Limited | Other services | 2015 |
| Purple Mango Restaurant Take Away Limited | Hospitality | 2025 |
| Purple Maze Consulting Limited | Professional & scientific | 2020 |
| Purple Squirrel Events Ltd | Administrative & support | 1999 |
| Pvhcc Ltd | Other services | 2007 |
| PW Prep Limited | Manufacturing | 2025 |
| PWC Living Solutions Limited | Construction | 2018 |
| QA Global Health Ltd | Extraterritorial | 2025 |
| QC Tech Centre Ltd | Other services | 2024 |
| QOD Construction Ltd | Construction | 2004 |
| QSA Partners LLP | | 2013 |
| Qstwenty Ltd | Professional & scientific | 2021 |
| Quadragon Ltd | Information & communication | 2011 |
| Quadrant B Ventures Limited | Real estate | 2026 |
| Quaestio Limited | Professional & scientific | 2023 |
| Qualis Engineering Ltd | Professional & scientific | 2018 |
| Quant Tech Ltd | Information & communication | 2025 |
| Quantum Diver Limited | Arts & recreation | 2021 |
| Quantum Space Resources Limited | Information & communication | 2025 |
| Quarter Mile Classics Ltd | Wholesale & retail | 2022 |
| Quartzlink Limited | Wholesale & retail | 2006 |
| Quay Associates Limited | Professional & scientific | 2003 |
| Quaysac Limited | Health & social care | 2021 |
| Quazar Limited | Professional & scientific | 2015 |
| Qube Network Enclosures Limited | Manufacturing | 2013 |
| Queenan Construction Limited | Real estate | 2016 |
| Quench Studios Ltd | Information & communication | 2007 |
| Quenlin Limited | Real estate | 2022 |
| Quick Motion Ltd | Transport & logistics | 2021 |
| Quickfix IT Services Ltd | Information & communication | 2023 |
| Quinn Revenue Advisory Ltd | Professional & scientific | 2024 |
| Quotespedia Ltd | Wholesale & retail | 2025 |
| R & R Griffin Ltd | Agriculture & fishing | 2002 |
| R a Walker (Farms) Limited | Agriculture & fishing | 1962 |
| R Buswell Stonemason Ltd | Construction | 2010 |
| R C Ammo Boxes and Sporting Supplies Ltd | Wholesale & retail | 2026 |
| R D & a Rhodes Limited | Agriculture & fishing | 2005 |
| R D Decorating (Banbury) Limited | Construction | 2008 |
| R D K I Limited | Construction | 2017 |
| R D Sands Holdings Limited | Administrative & support | 2025 |
| R J Murrey Electrical Limited | Construction | 2019 |
| R J R Freeman Homes Ltd | Construction | 2015 |
| R Johnson Electrical Limited | Energy | 2014 |
| R&A Cleaning Limited | Administrative & support | 2024 |
| R. Spencer Builders Limited | Construction | 2012 |
| R.A.A.N Ltd | Real estate | 2026 |
| R.B. Maintenance Limited | Construction | 2001 |
| R.C. Phillips Building Ltd | Construction | 2015 |
| R.F. Spencer and Company Limited | Extraterritorial | 1985 |
| R.J. Preston Limited | Construction | 1997 |
| R2C Limited | Wholesale & retail | 2025 |
| RA 2024 Ltd | Real estate | 2024 |
| RA Development (Banbury) Ltd | Real estate | 2023 |
| RA Marine Limited | Construction | 2001 |
| RA2025 Ltd | Real estate | 2025 |
| Rabbit Rigging Services Limited | Information & communication | 2019 |
| Race TEC Motorsports Ltd | Professional & scientific | 2009 |
| Racing Sponsors Ltd | Real estate | 2025 |
| Radman Property Holdings Limited | Real estate | 2025 |
| Radmore Consulting Limited | Professional & scientific | 2021 |
| RAF Tyres Ltd | Wholesale & retail | 2025 |
| Rafal G. Trans Ltd | Transport & logistics | 2017 |
| Rafs Builders Ltd | Construction | 2023 |
| Ragamama Limited | Manufacturing | 2019 |