| Renaissance IT Services Limited | Real estate | 2008 |
| RES Paraplanning Ltd | Financial services | 2026 |
| Resolution Web Limited | Information & communication | 2026 |
| Revolution VW Specialists Ltd | Wholesale & retail | 2019 |
| Reynolds Property Group Ltd | Real estate | 2019 |
| Richard Simpson Consulting Ltd | Information & communication | 2023 |
| Ricobongo Ltd | Information & communication | 2025 |
| Ridgeway Health and Aesthetics Limited | Health & social care | 2018 |
| Rightsurv Ltd | Professional & scientific | 2011 |
| Rightsurvey Ltd | Professional & scientific | 2012 |
| Road Farm Countryways C.I.C. | Agriculture & fishing | 2014 |
| Robertson and Partners Ltd | Real estate | 2025 |
| Robinson Telecom Services Limited | Information & communication | 2004 |
| Roco Holdings UK Ltd | Administrative & support | 2016 |
| Rodwell Close (Canberra House) RTM Company Limited | Households | 2003 |
| Rodwell Close (Ottawa House) RTM Company Limited | Households | 2004 |
| Rodwell Close (Pretoria House) RTM Company Limited | Households | 2004 |
| Rodwell Close (Salisbury House) RTM Company Limited | Households | 2004 |
| Rodwell Close (Wellington House) RTM Company Limited | Households | 2004 |
| Romquick Limited | Other services | 1996 |
| Rooksnest Ltd | Information & communication | 2023 |
| Ropewalk 35 Limited | Real estate | 2020 |
| RPG Performance Limited | Arts & recreation | 2022 |
| RTB Technology LLP | | 2026 |
| Rubber Nova Ltd | Professional & scientific | 2017 |
| Rutland House Residents Association Limited | Real estate | 1990 |
| Safety Boat Support Services Ltd | Administrative & support | 2022 |
| Samantha Jones Limited | Professional & scientific | 2017 |
| Sampson LOW, Marston and Company Limited | Information & communication | 2021 |
| Sandra Bull Communications Limited | Professional & scientific | 2005 |
| Sarah Wrench Associates Ltd | Professional & scientific | 2021 |
| Satin and TAT Limited | Arts & recreation | 2006 |
| SBS Holdings Limited | Real estate | 1997 |
| SCAN2SOLD Ltd | Professional & scientific | 2025 |
| Scurzon Associates Limited | Information & communication | 2022 |
| Seaford Close Freeholders Limited | Real estate | 1997 |
| Sehgal and Daughters Private Limited | Wholesale & retail | 2025 |
| Seilan Limited | Information & communication | 2021 |
| Septura Limited | Arts & recreation | 2014 |
| SGD Project Management Ltd | Construction | 2025 |
| Sheepcot Lane Garston Management Limited | Real estate | 2008 |
| Shepherd's HUT Outdoor Day Nursery Ltd | Education | 2023 |
| Sherbet Business Solutions Limited | Administrative & support | 2024 |
| Sherwood Accounting Limited | Professional & scientific | 2009 |
| Shields Residents' Association Limited | Real estate | 1979 |
| Shivom Global Limited | Wholesale & retail | 2025 |
| Side Door Productions Ltd | Information & communication | 2026 |
| Silky Ears Consulting Limited | Professional & scientific | 2013 |
| Silverdew Ltd | Professional & scientific | 2020 |
| Simmons & Hawker (Falcon Estate) Limited | Real estate | 1934 |
| Sinelly Limited | Hospitality | 2022 |
| SJD Decorating Services Ltd | Construction | 2024 |
| Smart Digital Forensics Ltd | Other services | 2019 |
| Smart Security Ltd | Manufacturing | 2000 |
| Solinger Farm Enterprises Limited | Agriculture & fishing | 2021 |
| Soulbravo Company Ltd | Wholesale & retail | 2017 |
| Southbound Records Ltd | Information & communication | 2025 |
| Sovereign Place (High Wycombe) Management Company Limited | Households | 2016 |
| Special Waste Services Limited | Water & waste | 2016 |
| Spencer HOW Ltd | Administrative & support | 2010 |
| Split App Ltd | Information & communication | 2024 |
| Sports Junction Ltd | Professional & scientific | 2005 |
| ST Trading (UK) Limited | Hospitality | 2015 |
| ST. Bernard's Court (High Wycombe) Limited | Real estate | 1972 |
| ST. Martin's Management (West Drayton) Limited | Households | 2001 |
| Staqservicesdevelopment Ltd | Extraterritorial | 2022 |
| Star Sky Music Ltd | Arts & recreation | 2021 |
| Starfish Legal Limited | Professional & scientific | 2023 |
| Stead Supply Chain Limited | Professional & scientific | 2009 |
| Stera International Limited | Professional & scientific | 1998 |
| Sterling North Ltd | Professional & scientific | 2013 |
| Storico Restorations Ltd | Wholesale & retail | 2012 |
| STR Pharma Ltd | Education | 2018 |
| Streamline Change Consulting Ltd | Administrative & support | 2006 |
| Stuart E Blagg Limited | Health & social care | 2009 |
| Student Support Service Ltd | Hospitality | 2008 |
| SUE Egan Associates Limited | Professional & scientific | 2010 |
| Sunday Communications Ltd | Professional & scientific | 2025 |
| Sunny Day Traders Ltd | Wholesale & retail | 2024 |
| Surindera Studios Ltd | Professional & scientific | 2008 |
| Suro Consulting (EP) Limited | Professional & scientific | 2017 |
| Susie Seligman Interior Design Limited | Professional & scientific | 2015 |
| Sycamore Court Residents Association (Hayes) Limited | Other services | 1985 |
| Taha Fish Bar Ltd | Hospitality | 2026 |
| Tajoma Brands Limited | Wholesale & retail | 2016 |
| Tangerine Sage Luxury Foods Limited | Manufacturing | 2003 |
| Tankard Bowkett Architects Limited | Administrative & support | 2017 |
| Taylor Estates (UK) Limited | Real estate | 2004 |
| TDN Limited | Professional & scientific | 2005 |
| Teen Engagement and Mentoring Limited | Education | 2023 |
| TGO Limited | Financial services | 2015 |
| Thame Road Haddenham (NO.2) Limited | Households | 1993 |
| THC Design Limited | Professional & scientific | 2018 |
| THE Abbeyfield Great Missenden & District Society | Hospitality | 1974 |
| THE Agency Partnership Ltd | Professional & scientific | 2017 |
| THE CAN Coach Ltd | Education | 2025 |
| THE Chequers Endodontic Practice Limited | Health & social care | 2013 |
| THE Chiltern Cider Company Limited | Manufacturing | 2015 |
| THE Community Equipment Code of Practice Scheme C.I.C. | Professional & scientific | 2011 |
| THE Crofters Residents (Maidenhead) Limited | Households | 1989 |