| Primrose Hill Flats Management Limited | Extraterritorial | 1989 |
| Print Copy Consulting Ltd. | Administrative & support | 2005 |
| Printx Ltd | Manufacturing | 2023 |
| Project Swann Bidco Limited | Financial services | 2024 |
| Project Swann Topco Limited | Financial services | 2024 |
| Promote Direct Ltd | Arts & recreation | 1996 |
| Properties (C.S.) Ltd. | Real estate | 1998 |
| Protech Finishing Employees Trustee Limited | Financial services | 2022 |
| Proximity Fire and Security Ltd | Construction | 2020 |
| Pureform Aeshetics Ltd | Other services | 2026 |
| Pureplan Building Services Limited | Construction | 2007 |
| Pyke Smith & Cutler Limited | Financial services | 2002 |
| Pytchley Estates Limited | Construction | 2000 |
| Pyxidia Solutions Limited | Extraterritorial | 2005 |
| QCG Limited | Wholesale & retail | 2003 |
| Queensberry Court Management Company Limited | Households | 1990 |
| Questclass Limited | Professional & scientific | 2003 |
| Quick Brown FOX Creative Services Limited | Professional & scientific | 2007 |
| Quoin Building Limited | Construction | 2002 |
| R & G Draper (Haulage) Limited | Transport & logistics | 1975 |
| R a O Stationers Limited | Wholesale & retail | 1992 |
| R D Millard Limited | Construction | 2007 |
| R J D Technical Services Limited | Professional & scientific | 2003 |
| R J Whyman Plant Hire Limited | Construction | 2002 |
| R&S Plumbing Limited | Construction | 2006 |
| R. Wilson Contractors Limited | Construction | 1999 |
| R.G. Collins Upholsterers Limited | Other services | 2002 |
| R.I.J.O. (UK) Limited | Other services | 1997 |
| R.Meadows Ltd | Professional & scientific | 2002 |
| Racecrest Limited | Construction | 1970 |
| Rack & Shelf Labels (UK) Limited | Administrative & support | 2006 |
| Rainbow Electrical Contracting Limited | Construction | 1977 |
| RAJ Rentals Ltd | Real estate | 2024 |
| Rakecane Ltd | Professional & scientific | 2015 |
| Rampchild Limited | Construction | 2003 |
| Ranheat Engineering Limited | Manufacturing | 1991 |
| Raso Trading Limited | Hospitality | 2023 |
| Readwell Care Limited | Education | 2006 |
| Rectory Court (Rushden) Management Co. Ltd. | Real estate | 1994 |
| Redfox Consultancy Limited | Information & communication | 2005 |
| Regal Park Management Limited | Extraterritorial | 1991 |
| Reids DRY Cleaners Limited | Other services | 2003 |
| Reids of Henley Limited | Other services | 2005 |
| Reids Playground Maintenance Limited | Construction | 2007 |
| REMINGTON2 Services Limited | Administrative & support | 2018 |
| Resolversolutions Limited | Information & communication | 2007 |
| Respect at Work Limited | Professional & scientific | 2007 |
| Retec Machine Tools Limited | Manufacturing | 1990 |
| RGR Memorials Limited | Administrative & support | 2001 |
| Richard Adams Furnishings Limited | Manufacturing | 2002 |
| Richard Gary (Contracting) Limited | Manufacturing | 1998 |
| Richardson Retail Limited | Extraterritorial | 1971 |
| RKB Precision Products Limited | Manufacturing | 1992 |
| RMP Business Services Limited | Professional & scientific | 2003 |
| Roberts and Chick (Timber Lines) Limited | Transport & logistics | 1996 |
| Rockingham Management Ltd | Real estate | 1991 |
| Rocks OFF Limited | Manufacturing | 2003 |
| Rodgers Coaches Limited | Transport & logistics | 2004 |
| Rogers and Family Limited | Real estate | 2024 |
| Rooms by Design Limited | Professional & scientific | 1996 |
| Rotaswift Limited | Other services | 1993 |
| Rotasystem Service Ltd | Professional & scientific | 2024 |
| Rousselet/Robatel UK Limited | Administrative & support | 2003 |
| RS Haynes Contracting Limited | Construction | 2001 |
| Rudra Modha Ltd | Hospitality | 2002 |
| Rugby Eyecare Limited | Health & social care | 2007 |
| Rushden Sports Limited | Real estate | 1920 |
| Rutland Shoe Company Limited | Extraterritorial | 1992 |
| Ryne Quality Confectionery Limited | Transport & logistics | 1979 |
| S & S Automotive Limited | Wholesale & retail | 2001 |
| S M O'Keife (Installations) Limited | Administrative & support | 2016 |
| S. L. I. K. Sparks Limited | Construction | 2004 |
| S. Wheatman Consultancy Ltd | Professional & scientific | 1999 |
| S.P. Marks Services Ltd. | Construction | 1996 |
| S.Warwick & SON Limited | Wholesale & retail | 1962 |
| Safety First UK Limited | Professional & scientific | 2005 |
| Saffiro Limited | Administrative & support | 1979 |
| Sala Management Limited | Professional & scientific | 2001 |
| Samic Industrial Enamellers Limited | Manufacturing | 1974 |
| Sammy Squirrel Limited | Administrative & support | 2006 |
| Sandfield Group Limited | Professional & scientific | 1949 |
| Sandgate (Ealing) Ltd. | Real estate | 2007 |
| Sapphire Consultancy Limited | Professional & scientific | 2007 |
| Sarma Limited | Real estate | 1984 |
| Saywards Limited | Wholesale & retail | 2007 |
| Sceptre Engineering Limited | Professional & scientific | 2007 |
| Scotts of Thrapston Limited | Manufacturing | 2001 |
| SD Beards Limited | Financial services | 2002 |
| Securelease Residents Management Limited | Households | 1987 |
| Seychell Products Limited | Extraterritorial | 1997 |
| Shades Investments Limited | Real estate | 1996 |
| Shadowood Residents Company Limited | Households | 1987 |
| Shakti Limited | Real estate | 1995 |
| Sharnbrook Amateur Theatre Trust Limited(The) | Arts & recreation | 1965 |
| Sheelaltaf Perpetual Investments Limited | Real estate | 2003 |
| Shiells Thatching Ltd | Construction | 2002 |
| Shire Glass Northampton Limited | Construction | 2006 |
| Silverstone Circuits Limited | Arts & recreation | 1966 |
| Simat Limited | Construction | 2003 |
| Sky Electronic Systems Limited | Manufacturing | 1993 |