| Realm Homes (the Lighthouse) Management Company Limited | Households | 2002 |
| Rechord Limited | Information & communication | 2003 |
| Rectory (Central) Management Limited | Households | 1980 |
| Rectory Gardens Residents Company Limited | Households | 1999 |
| Red Depot Autocare Ltd | Wholesale & retail | 2017 |
| Red Depot Autosales Ltd | Wholesale & retail | 2018 |
| Red Marmoset Studios Limited | Information & communication | 2021 |
| Redshots Computer Services Limited | Information & communication | 1997 |
| Regents Gate Management Company Limited | Households | 1994 |
| Remr Financial Services Ltd | Professional & scientific | 2016 |
| Renate Nicolaisen Limited | Information & communication | 2019 |
| Renesas Design (UK) Limited | Professional & scientific | 1985 |
| Renesas Electronics Europe Limited | Wholesale & retail | 2002 |
| Renesas Electronics Operations Services Limited | Professional & scientific | 2013 |
| Renrag Ltd | Information & communication | 2022 |
| Rent a Cube Ltd | Real estate | 2012 |
| Reoc Construction Limited | Construction | 2019 |
| Retail & Commercial Plastics Limited | Manufacturing | 1993 |
| Retro British Ltd | Wholesale & retail | 2019 |
| Returngain Limited | Real estate | 1991 |
| Revere Developments (Smiths Lane) Ltd | Construction | 2024 |
| Revere Homes Limited | Construction | 2022 |
| REX Ventures Ltd | Professional & scientific | 2022 |
| Richardson Capital Advisory Limited | Professional & scientific | 1995 |
| Ridge View Limited | Real estate | 1998 |
| Ridlands (Canterbury) Management Company Limited | Extraterritorial | 2002 |
| Rigden Ltd | Construction | 2014 |
| Risby Limited | Administrative & support | 2015 |
| Rivermead Comms Ltd | Information & communication | 2026 |
| Rivermead Gardens (Alton) Management Company Limited | Households | 2022 |
| Riverside House Management (Bourne END) Limited | Households | 2017 |
| RK Construction Services Ltd | Construction | 2014 |
| RL Property Tech Ltd | Financial services | 2024 |
| RLM Property Consulting Ltd | Professional & scientific | 2024 |
| RNP Property Investments Ltd | Real estate | 2023 |
| Road Way Services 24 Ltd | Transport & logistics | 2024 |
| Road Way Services Limited | Transport & logistics | 2017 |
| Roads Place (Management) Limited | Households | 1987 |
| Roads Place Freehold Limited | Households | 1999 |
| Robert Barrie Limited | Wholesale & retail | 2012 |
| Robert Russell Developments Limited | Construction | 1960 |
| Roche Associates Ltd | Professional & scientific | 2006 |
| Rockport Properties Limited | Real estate | 1991 |
| Rohasco Limited | Information & communication | 2016 |
| Rolstons Sales Limited | Real estate | 2021 |
| Romeo Tango Ltd | Other services | 2014 |
| Roselands Management Co Limited | Households | 1988 |
| Rosery Residents' Association Limited(The) | Real estate | 1972 |
| Ross Grey Ltd | Manufacturing | 2011 |
| Rosslyn Marketing Services Ltd. | Administrative & support | 1995 |
| Rowan House Bourne END RTE Company Limited | Households | 2004 |
| Rowans Creative Limited | Construction | 2011 |
| Rowenna Malone Ltd | Manufacturing | 2023 |
| ROY Westwood Holdings Ltd | Financial services | 2018 |
| Ruislip Care Home Limited | Health & social care | 2013 |
| RUNNING2TIME Limited | Information & communication | 2021 |
| Ruth Miller Associates Limited | Administrative & support | 2009 |
| Rv&Rv Medical Limited | Health & social care | 2023 |
| RWF Consulting Ltd | Administrative & support | 2006 |
| S & C Properties (Reading) Limited | Real estate | 2011 |
| S Rogers Haulage Limited | Transport & logistics | 2011 |
| Sales Untangled Limited | Professional & scientific | 2006 |
| Salmi (U.K.) Limited | Administrative & support | 1994 |
| Salteal Limited | Real estate | 2017 |
| Saltings Management Company Limited | Households | 1988 |
| Samantha Thorne Properties Limited | Real estate | 2021 |
| Samphire Court Residents Limited | Extraterritorial | 1999 |
| Saxon Lodge Management Company Limited | Households | 1984 |
| SC (Projects and Consulting) Ltd | Professional & scientific | 2018 |
| Scandic Care Limited | Health & social care | 2008 |
| Scenerelay Limited | Real estate | 2002 |
| Scholarsfield Management Limited | Households | 2017 |
| Scott Compass Limited | Real estate | 1990 |
| Scram Properties Limited | Real estate | 2021 |
| Sdwm Limited | Financial services | 2019 |
| Sea Croft Management (Bournemouth) Limited | Households | 1995 |
| Searching for Silicon Ltd | Wholesale & retail | 2024 |
| Sebi Group Limited | Financial services | 2021 |
| Sebi Holdings Limited | Financial services | 2023 |
| Second Hazelwood Residents Association Limited | Households | 1990 |
| Second Weybrook Residents Association (Guildford) Limited | Households | 1988 |
| Sefton Park Ltd | Real estate | 2025 |
| September Court Management Company Limited | Administrative & support | 2009 |
| Septua Star Ltd | Financial services | 2021 |
| Server Technology UK Ltd | Information & communication | 1995 |
| SEW SEW Pretty Ltd | Manufacturing | 2018 |
| SG Fire and Security Limited | Construction | 2024 |
| SGA Property Investments Limited | Real estate | 2020 |
| Shaen Garage Limited | Wholesale & retail | 1964 |
| Sharrow House Management Limited | Households | 1970 |
| Shawlocke Homes Ltd | Real estate | 2019 |
| Shawship Enterprise Ltd | Financial services | 2024 |
| Shelley Freehold Limited | Households | 2003 |
| Shellwin Asset Management Limited | Real estate | 2023 |
| Shellwin Holdings Limited | Financial services | 2019 |
| Shellwin Limited | Construction | 1964 |
| Sherbert Research Limited | Professional & scientific | 2003 |
| Sherwood Court Management Limited | Households | 1970 |
| Sherwood Online Ltd | Wholesale & retail | 2020 |
| Ships Point Limited | Households | 2001 |