| Richard a Harrison Limited | Wholesale & retail | 2006 |
| Richard Edgeworth Associates Ltd | Professional & scientific | 2010 |
| Richmond Lock Management Company Limited | Households | 2004 |
| Richmond Mycology Limited | Agriculture & fishing | 2025 |
| Richmond Towers and Courts Company Limited | Households | 1993 |
| Richmond Upon Thames Crossroads Care | Health & social care | 1994 |
| Rising App Limited | Information & communication | 2024 |
| Risk Capital Management Limited | Financial services | 2020 |
| Risk MKT Limited | Information & communication | 2025 |
| River Confluence Ltd | Information & communication | 2026 |
| Rivermead Close Block E Freehold Ltd | Real estate | 2019 |
| Rivermead Gatehouse Property Management Ltd | Households | 2024 |
| RJR Touring Limited | Arts & recreation | 2008 |
| RMP Transport Consulting Limited | Transport & logistics | 2026 |
| RMW Markets Advisory Limited | Professional & scientific | 2026 |
| RNS Drinks & Grocery Ltd | Wholesale & retail | 2023 |
| Roan Records Ltd | Wholesale & retail | 2020 |
| ROB Osborne Design Ltd | Professional & scientific | 2013 |
| Robert Collins Electrical Limited | Construction | 1976 |
| Robert Owen Communities | Health & social care | 1986 |
| Robin James Consulting Limited | Professional & scientific | 2025 |
| Robitect Limited | Information & communication | 2014 |
| Rock School Limited | Professional & scientific | 2015 |
| ROD Linter Consulting Limited | Professional & scientific | 2010 |
| Rodgers Corporate Ltd | Wholesale & retail | 2017 |
| Roebuck Mortgages and Protection Limited | Financial services | 2018 |
| Roger Gray Consulting Limited | Professional & scientific | 2025 |
| Roofpro London Ltd | Construction | 2006 |
| Room for Work Limited | Education | 2014 |
| Roots + Wings Studio Limited | Professional & scientific | 2021 |
| Rose&Gs Ltd | Wholesale & retail | 2025 |
| ROSES247 Ltd | Wholesale & retail | 2024 |
| Rosewick Limited | Real estate | 2024 |
| Roundtable (UK) Limited | Administrative & support | 2006 |
| Rowden Reporting Limited | Information & communication | 2024 |
| Rowe Consultancy Services Limited | Extraterritorial | 2019 |
| Rozsa Builders Ltd | Construction | 2018 |
| RP NET Ltd | Information & communication | 2008 |
| RPA Home Limited | Construction | 2013 |
| RR Squared Properties Limited | Real estate | 2018 |
| RR Tennis Ltd | Education | 2025 |
| RSH Land Ltd | Real estate | 2016 |
| RSL Awards Limited | Education | 1991 |
| RSL Group Holdings Limited | Financial services | 2024 |
| RSL Group Services Limited | Administrative & support | 1996 |
| Rubiconnect Ltd | Information & communication | 2025 |
| Ruils | Other services | 2008 |
| Rural Investors Ltd | Real estate | 2022 |
| Rushmere Grove Management Company Limited | Households | 1997 |
| Russell Education Trust | Education | 2010 |
| Ruth Redding Ltd | Professional & scientific | 2024 |
| S Croft Business and Accountancy Services Limited | Professional & scientific | 2013 |
| S W Packing Limited | Transport & logistics | 2008 |
| S.A. Morton Real Estates Ltd | Real estate | 2018 |
| S.J Shatri Construction Limited | Construction | 2024 |
| S.O.S Brothers Construction Ltd | Construction | 2024 |
| Saccomaninewton Limited | Professional & scientific | 2012 |
| Sacred Waters Boatworks Ltd | Manufacturing | 2025 |
| Safety Differently Limited | Professional & scientific | 2018 |
| Safetylogz Ltd | Information & communication | 2020 |
| Sage EYE Media Ltd | Information & communication | 2014 |
| Sakinx Ltd | Information & communication | 2023 |
| Salamander Quay (Hampton Wick) Residents Association Limited | Real estate | 1978 |
| Sally Hughes Ltd | Information & communication | 2012 |
| SAM Bulkeley Therapy Ltd | Health & social care | 2023 |
| SAM Fish Bar Ltd | Hospitality | 2023 |
| Samms Consulting Ltd | Professional & scientific | 2024 |
| Sample Answers Limited | Administrative & support | 1995 |
| Sandfords London Limited | Construction | 1994 |
| Sandhurst Marquees Limited | Arts & recreation | 2003 |
| Sandkasteel Investing Limited | Financial services | 2020 |
| Sanse International Ltd | Professional & scientific | 2017 |
| Sant Cugat Advisory Ltd | Professional & scientific | 2025 |
| Saprorganix Ltd | Agriculture & fishing | 2022 |
| Sarah Dormer-Thomas Limited | Financial services | 2015 |
| Sarah E Wright Consulting Ltd | Professional & scientific | 2018 |
| Sarah White Creative Limited | Professional & scientific | 2026 |
| Sarathy Limited | Health & social care | 2020 |
| Sarbel Property Ltd | Real estate | 2017 |
| Sargood Golf Ltd | Arts & recreation | 2022 |
| Sarosi Transport Ltd | Transport & logistics | 2018 |
| Sarvy Collection Limited | Real estate | 2025 |
| Sasare Group Limited | Hospitality | 2014 |
| Saunders Networks Ltd | Information & communication | 2023 |
| Saunders Scott Consulting Limited | Administrative & support | 2026 |
| Saunders Scott Limited | Administrative & support | 2010 |
| Saxon Gate Development Limited | Construction | 2016 |
| Saxonhurst RTM Company Limited | Households | 2013 |
| Scaffold Shakespeare Company Limited | Arts & recreation | 2013 |
| SCM Food Services UK Ltd | Wholesale & retail | 2026 |
| Scolari Limited | Education | 2025 |
| SCOOPER1 Ltd | Professional & scientific | 2023 |
| Scorpius Nutrition Limited | Health & social care | 2012 |
| Scots Consultants (London) Limited | Financial services | 2015 |
| Scots Trustees and Pensions Limited | Information & communication | 1982 |
| Scribble Productions Limited | Information & communication | 2005 |
| SD Handyman Ltd | Construction | 2019 |
| Sea Swallow Ltd | Hospitality | 2025 |
| Sebrand Limited | Professional & scientific | 2008 |
| Secnix Systems Limited | Information & communication | 2010 |