| Providence Investments Limited | Real estate | 2003 |
| Prowse Restaurant Ltd | Hospitality | 2025 |
| Proyecto Bolivar | | 1997 |
| Pruthi Lettings Limited | Real estate | 2025 |
| Pryceless Sports Group Ltd. | Arts & recreation | 2026 |
| Prycross Limited | Real estate | 2002 |
| Pryority Services Limited | Manufacturing | 2001 |
| PSL Tuning Files Ltd | Wholesale & retail | 2021 |
| PSP Dwellings Company Ltd | Construction | 2026 |
| Psychangles Ltd | Health & social care | 2025 |
| Psychedelic Enterprises Ltd | Wholesale & retail | 2021 |
| Ptlgateway Limited | Information & communication | 2005 |
| Public Sector Information Limited | Information & communication | 1997 |
| Publications International Limited | Information & communication | 1985 |
| Puddings and Poetry Ltd | Manufacturing | 2019 |
| Pufftata Art Limited | Wholesale & retail | 2025 |
| Pukam Ltd | Wholesale & retail | 2026 |
| Pukka Kids Limited | Extraterritorial | 2004 |
| Pukkanasha Ltd | Information & communication | 1998 |
| Pullan Hunt Limited | Construction | 2000 |
| Pulsehelp CIC | Health & social care | 2024 |
| Pulsenova Ltd | Wholesale & retail | 2026 |
| Pulserate Medical Services Ltd | Health & social care | 2002 |
| Pure IT Recruitment Limited | Administrative & support | 2020 |
| Pure Sales Ltd | Wholesale & retail | 2025 |
| Pure Wild Ltd | Wholesale & retail | 2026 |
| Purple Fountain Limited | Real estate | 2022 |
| Purplex Limited | Real estate | 1997 |
| Purvi Limited | Wholesale & retail | 2003 |
| Pushpa Foods Ltd | Wholesale & retail | 2026 |
| Pushpa Seafoods Ltd | Wholesale & retail | 2025 |
| Pyramid Investments (UK) Limited | Real estate | 2000 |
| Python Electrical Services Ltd | Construction | 2024 |
| Q a T C (Europe) Limited | Administrative & support | 1993 |
| Q. P. P. Limited | Manufacturing | 1992 |
| Q.A.A. Limited | Professional & scientific | 1997 |
| Q.E. Logistics Limited | Transport & logistics | 2001 |
| Q.Siddiqui & Co Ltd | Professional & scientific | 2012 |
| Q7 Limited | Other services | 2006 |
| Qarah Digital Services Ltd | Information & communication | 2022 |
| QC Wellbeing CIC | Education | 2023 |
| Qcktech Trading Company Ltd | Wholesale & retail | 2025 |
| Qingdao Gembea Jewelry Co., Ltd | Wholesale & retail | 2025 |
| Qiudan Times (UK) Co., Limited | Manufacturing | 2023 |
| QIV Global Limited | Other services | 2026 |
| Qroboros Limited | Wholesale & retail | 2026 |
| Qrsm International Co. Ltd | Construction | 2024 |
| QRU TIA Ltd | Wholesale & retail | 2020 |
| Quaife Music Publishing Ltd | Manufacturing | 2001 |
| Qualcon Joinery (89) Limited | Wholesale & retail | 1989 |
| Quality Products and Services Limited | Administrative & support | 2007 |
| Quality Property and Rentals Limited | Real estate | 2024 |
| Quantrofx PVT Limited | Administrative & support | 2026 |
| Quantum Beer Limited | Extraterritorial | 1998 |
| Quantum Skill Solutions Limited | Information & communication | 2024 |
| Quantumrange Limited | Real estate | 1992 |
| Quantyra Ltd | Wholesale & retail | 2026 |
| Quatromed Limited | Wholesale & retail | 2006 |
| Queenborough Properties Limited | Households | 2006 |
| Queens Square Limited | Financial services | 2023 |
| Questone Ltd | Professional & scientific | 2007 |
| Quetzal Group Limited | Health & social care | 2025 |
| QUICK2DOOR Ltd | Wholesale & retail | 2026 |
| Quicksilver Couriers (Brentwood) Limited | Transport & logistics | 2002 |
| Quicksilver Language Services Limited | Professional & scientific | 2001 |
| Quicktime Contracts Limited | Administrative & support | 2000 |
| Quilco Limited | Financial services | 2007 |
| Quintessential Education Ltd | Education | 2021 |
| Quion Ltd | Wholesale & retail | 2025 |
| Quipix Ltd | Wholesale & retail | 2025 |
| Quorvex Ltd | Wholesale & retail | 2025 |
| R & a Electrical London Limited | Other services | 2021 |
| R & H Ltd | Wholesale & retail | 1996 |
| R & K Property Services Limited | Real estate | 2000 |
| R & R Design (UK) Limited | Professional & scientific | 2005 |
| R Eighteen Ltd | Manufacturing | 2025 |
| R G Rupal Ltd | Professional & scientific | 2003 |
| R J Electrics Limited | Construction | 1998 |
| R J Travels & Tours Ltd | Administrative & support | 2005 |
| R L Communications Ltd | Information & communication | 2007 |
| R M Restorations (Colchester) Limited | Wholesale & retail | 2003 |
| R Mgmt. Ltd | Administrative & support | 2026 |
| R N S Mechanical Engineering Limited | Construction | 2002 |
| R Pomphrett Limited | Administrative & support | 2006 |
| R Z R Trading Limited | Administrative & support | 1995 |
| R&H Confectionery Ltd | Hospitality | 2019 |
| R&M Capital Ltd | Real estate | 2003 |
| R-Glass Limited | Manufacturing | 1987 |
| R. G. Prentice Limited | Wholesale & retail | 2007 |
| R. J. V. Limited | Wholesale & retail | 2007 |
| R. Vora & Co. Limited | Professional & scientific | 2003 |
| R.B. Radley & Company Limited | Manufacturing | 1966 |
| R.D. Plaster Mouldings Ltd | Construction | 2003 |
| R.D.G. Fire Safety Limited | Manufacturing | 2007 |
| R.E. Choles Limited | Real estate | 1953 |
| R.G. Brooks Limited | Administrative & support | 2004 |
| R.Gibson & Sons Limited | Agriculture & fishing | 1957 |
| R.I. Lilly Ltd | Construction | 2000 |
| R.J. Warbey & Co. Limited | | 1974 |
| R.J.C. (U.K.) Limited | Other services | 1977 |