| Posh Wash Mobile Valeting Ltd | Wholesale & retail | 2026 |
| Positive Gains Ltd | Professional & scientific | 2012 |
| Post Oak Production Ltd | Information & communication | 2021 |
| Potentilla Limited | Professional & scientific | 2000 |
| Pottrill Holland Property Agents Limited | Real estate | 2022 |
| Pounds to Pleasure Ltd | Professional & scientific | 2025 |
| Povami Ltd | Financial services | 2020 |
| PRC Construction Ltd | Construction | 2020 |
| PRC South West Ltd | Construction | 2023 |
| Precision Biosearch Ltd | Administrative & support | 2020 |
| Premiere Dressage Equestrian Ltd | Agriculture & fishing | 2024 |
| Premiere Studios Group Limited | Information & communication | 2021 |
| Pressential Limited | Professional & scientific | 2017 |
| Prestige Sash Restoration Ltd | Construction | 2025 |
| Pretoria Properties Ltd | Real estate | 2022 |
| Prevs Group Limited | Administrative & support | 2022 |
| Prgrmtk Limited | Professional & scientific | 2014 |
| Price-Smith Limited | Information & communication | 1997 |
| Pride PT Studio Ltd | Arts & recreation | 2026 |
| Print 4 Business Limited | Manufacturing | 2003 |
| Privare Ltd | Wholesale & retail | 2025 |
| Privileged Connections Ltd | Administrative & support | 2012 |
| Pro Graphic Installations Limited | Arts & recreation | 2011 |
| Prochem (UK) Limited | Professional & scientific | 1997 |
| Prochem Europe Limited | Wholesale & retail | 1974 |
| Product Heads Limited | Information & communication | 2021 |
| Production Music Awards Limited | Administrative & support | 2026 |
| Professional Chemical and Equipment Company Limited | Professional & scientific | 1996 |
| Profile Hardware Ltd. | Manufacturing | 1995 |
| Programme Control Services Ltd | Information & communication | 2012 |
| Progress 55 Management Limited | Real estate | 2006 |
| Progressive Imaging Partners Limited | Professional & scientific | 2017 |
| Project Hypernova Ltd | Professional & scientific | 2026 |
| Project Planning and Management Limited | Professional & scientific | 1991 |
| Projectable Limited | Professional & scientific | 2022 |
| Prolificvoices Ltd | Information & communication | 2023 |
| Proline Garage Limited | Wholesale & retail | 2025 |
| Promoter Software Limited | Information & communication | 1991 |
| Propelling Pencil Communications Ltd | Administrative & support | 2023 |
| Property Movements Group Ltd | Real estate | 2025 |
| Proprent Limited | Real estate | 2012 |
| Prospera House Limited | Professional & scientific | 2025 |
| Protermars Ltd | Manufacturing | 2017 |
| Proteus Consulting LLP | | 2023 |
| Pryke Developments Limited | Professional & scientific | 2016 |
| PTR Plumbing & Heating Ltd | Construction | 2020 |
| Pull Focus Ltd | Information & communication | 2011 |
| Purchasing Systems (MEA) Limited | Other services | 2002 |
| Pure Saffron Ltd | Hospitality | 2024 |
| Pure Sourcing Ltd | Real estate | 2019 |
| Purely Planning Limited | Professional & scientific | 2017 |
| Purplemass Limited | Information & communication | 2010 |
| PWJ Consultancy & Design Ltd | Professional & scientific | 2023 |
| Pyxll Ltd | Information & communication | 2010 |
| Qaviss Limited | Professional & scientific | 2011 |
| Qubos Associates Limited | Professional & scientific | 2012 |
| Quendon Enterprises Limited | Financial services | 1994 |
| Quentin Letts Limited | Construction | 2004 |
| Quinergy Limited | Professional & scientific | 2012 |
| R & B Building Works Limited | Construction | 2017 |
| R & P Consulting Services Limited | Professional & scientific | 2007 |
| R and J Home Solutions Limited | Real estate | 2023 |
| R-Tech Computer Services Ltd | Other services | 2020 |
| R. B. Dennison Limited | Real estate | 2016 |
| R.A. Bacon & SON Limited | Wholesale & retail | 1972 |
| Racing Newmarket Limited | Professional & scientific | 2004 |
| Rackham & Co Ltd | Administrative & support | 2021 |
| Radhika Holmstrom Limited | Administrative & support | 2002 |
| Radiant Bits Ltd | Information & communication | 2026 |
| Radwinter Barns Ltd | Real estate | 2022 |
| Radwinter Wild Game Company LLP | | 2008 |
| Ragt Seeds Limited | Agriculture & fishing | 2004 |
| Railway Street Barbers Ltd | Other services | 2019 |
| Raipec Limited | Manufacturing | 2001 |
| Rand Surveyors Ltd. | Real estate | 2007 |
| Rangiputa Records Limited | Information & communication | 2006 |
| Rare Earth International Ltd | Information & communication | 2019 |
| RDY Properties Limited | Professional & scientific | 2014 |
| Read Business Consultancy Ltd | Other services | 2018 |
| Readers Field Glamping Ltd | Hospitality | 2025 |
| Real Bodies Health & Fitness Ltd | Arts & recreation | 2010 |
| Real Hackney Dave Enterprises Limited | Arts & recreation | 2019 |
| Real Time Club Limited | Other services | 2011 |
| Realturf UK Ltd | Wholesale & retail | 2020 |
| Rebel Finance Ltd | Financial services | 2021 |
| Recco Project and Safety Consultants Limited | Professional & scientific | 2017 |
| Red & White Films Limited | Information & communication | 2012 |
| Red Box INT Holdings Limited | Financial services | 2009 |
| Red Box International Limited | Manufacturing | 1994 |
| Red Green Marketing Ltd | Hospitality | 2015 |
| Red Green Wine Ltd | Wholesale & retail | 2026 |
| Red Oak Property Limited | Construction | 2026 |
| Red Ring Limited | Information & communication | 2012 |
| Red River Construction Ltd | Construction | 2025 |
| Red Sky Capital Solutions LLP | | 2008 |
| Redfern Electronics Limited | Professional & scientific | 2007 |
| Redgate Property Lettings Ltd | Real estate | 2018 |
| Redrat Limited | Manufacturing | 2002 |
| Redwalls Property Services Limited | Professional & scientific | 2018 |
| Redwood Event Solutions Limited | Professional & scientific | 2015 |