| Rivalmiddle Limited | | 1988 |
| Riverside (Sipp) Ltd | Extraterritorial | 2006 |
| RJC Planning Ltd | Professional & scientific | 2025 |
| Rmarcys Limited | Wholesale & retail | 2026 |
| RMM South East Ltd | Construction | 2018 |
| Roach Manufacturing Limited | Manufacturing | 1979 |
| Roanmond Limited | Manufacturing | 1988 |
| Robert James (Farnborough) Limited | Real estate | 2001 |
| Robert Perera Fine Art Limited | Wholesale & retail | 2003 |
| Robert Tutton Town Planning Consultants Limited | Professional & scientific | 2007 |
| Rockhopper Web Design Limited | Information & communication | 2006 |
| Roger Black Limited | Administrative & support | 1992 |
| Rohde & Schwarz U.K. Limited | Wholesale & retail | 1954 |
| Rolec Enclosures Limited | Wholesale & retail | 1999 |
| Romsey and District Buildings Preservation Trust Limited | Construction | 1975 |
| Romsey Coaches Limited | Transport & logistics | 2002 |
| Romsey Trout Farm Limited | Agriculture & fishing | 1980 |
| Ronald V.Henderson (Bearings) | Wholesale & retail | 1959 |
| Rong YI Ltd | Hospitality | 2017 |
| Rose Enterprises (Southern) Limited | Administrative & support | 2018 |
| Roseworld Properties Ltd | Extraterritorial | 2024 |
| Rosie Landscapes Ltd | Administrative & support | 2004 |
| Roslyne Ltd | Professional & scientific | 2007 |
| Rostherne Investments Limited | Real estate | 2006 |
| Rowland SON & Vincent(Property)Limited | Construction | 1964 |
| Royalblue Ltd. | Extraterritorial | 1994 |
| Royce UK Limited | Manufacturing | 2000 |
| Royle Jackson Limited | Manufacturing | 1985 |
| Royston House (Andover) Limited | Households | 2006 |
| RRS Commerce Limited | Wholesale & retail | 2021 |
| RSA Property Limited | Construction | 2009 |
| RSI Limited | | 1979 |
| Rudra Innovations Limited | Information & communication | 2021 |
| Runfold Plastics Limited | Manufacturing | 1976 |
| Running Crazy Limited | Administrative & support | 2004 |
| Rushcliffe Day Nurseries Limited | Education | 2008 |
| Ryder Computer Services Limited | Information & communication | 1994 |
| Ryland Research Limited | Manufacturing | 2003 |
| S J Epps Joinery Limited | Construction | 2002 |
| S P Carpentry Limited | Construction | 2004 |
| S W Asgood Holdings Limited | Financial services | 2004 |
| S White Plastering Limited | Construction | 2007 |
| S. DE Ville Robinson Marketing Solutions Limited | Professional & scientific | 2007 |
| S.B.T.S. Limited | Professional & scientific | 2007 |
| S.D. Howells Builders Limited | Construction | 2002 |
| S.J.B. International Limited | Information & communication | 1987 |
| S.R.G. Plumbing & Heating Limited | Construction | 2003 |
| S.R.Gas Ltd | Construction | 2008 |
| S49 Limited | Professional & scientific | 2005 |
| Saddlers Close Management Company Limited | Households | 2003 |
| Saishi Limited | Information & communication | 2003 |
| Salad Publishing Limited | Administrative & support | 2005 |
| SAM Porter Ltd | Wholesale & retail | 1975 |
| Samantha Donald Limited | Professional & scientific | 2007 |
| Sander Computer Service Limited | Transport & logistics | 1996 |
| Sandles Health Clinic Limited | Arts & recreation | 2006 |
| Sangy Limited | Professional & scientific | 2007 |
| Sanjarani Software Limited | Information & communication | 2006 |
| Sansa Corp Ltd | Information & communication | 2018 |
| Saorphin Farms Limited | Financial services | 2003 |
| Sapom Trading Ltd | Wholesale & retail | 2023 |
| Sarisbury Sports & Football Club Limited | Arts & recreation | 1996 |
| Sarson Limited | Administrative & support | 2007 |
| SAS Plumbing & Heating Limited | Construction | 2006 |
| Sastra Arts Limited | Other services | 2023 |
| Sawpod Ltd | Agriculture & fishing | 2007 |
| Saxar Ltd | Extraterritorial | 2021 |
| Sayer Redman Limited | Construction | 2005 |
| Scanners (Europe) Limited | Information & communication | 1993 |
| Scanners Television Outside Broadcasts Limited | Information & communication | 1997 |
| SCH Engineering Limited | Professional & scientific | 2007 |
| Schatzi Digital Ltd | Information & communication | 2023 |
| Schlumberger Flow Measurement Limited | Professional & scientific | 1945 |
| Scorecharge Limited | Households | 2002 |
| Scott Bailey LLP | | 2007 |
| Scotweiller Consultancy Ltd | Professional & scientific | 2007 |
| SD Analytica Limited | Professional & scientific | 2003 |
| Sdlg UK Limited | Other services | 2026 |
| Sea Fare Two Limited | Hospitality | 2006 |
| Seetrax CAE Limited | Manufacturing | 2003 |
| Sefton & Co 1936 Ltd | Health & social care | 2013 |
| Segal & Higney Developments Limited | Construction | 2011 |
| Select Refurbishment & Maintenance Ltd | Construction | 2007 |
| Seligman Farm Enterprises Limited | Agriculture & fishing | 2006 |
| Selsound Limited | Manufacturing | 1975 |
| Sensonic-Uk Limited | Professional & scientific | 2019 |
| Sentha Retail Ltd | Wholesale & retail | 2023 |
| Sentinel Investments Limited | Transport & logistics | 1994 |
| Sentry Self Storage Limited | Transport & logistics | 1988 |
| Serco Pension Trustee Limited | Administrative & support | 2015 |
| Serverforce Limited | Information & communication | 2004 |
| Seven Seeds Vending Ltd. | Wholesale & retail | 1995 |
| Seven TEN Five Hundred Limited | Transport & logistics | 2007 |
| SEW & Stitch Limited | Other services | 2002 |
| SG Scientific Communications & Consultancy Limited | Professional & scientific | 2024 |
| Shape Southsea Limited | Other services | 2003 |
| Sharman Media Limited | Information & communication | 2007 |
| Sharpe Commercial Limited | Administrative & support | 2019 |
| Sharron Davies Limited | Information & communication | 1996 |
| Shaun Bradley Project Services Ltd. | Professional & scientific | 1993 |