| Reasons Trading Ltd | Wholesale & retail | 2024 |
| Recruitment Capital Investment Holdings Ltd | Financial services | 2026 |
| Red Peppers Grillhouse Ltd | Hospitality | 2026 |
| Refined Bodyshop Ltd | Wholesale & retail | 2020 |
| Renaissance Window Systems Limited | Manufacturing | 2008 |
| Rence Engineering Service Limited | Manufacturing | 2002 |
| Republik of Ideas Limited | Manufacturing | 2023 |
| Resilience Business Support Limited | Professional & scientific | 2022 |
| Retail Systems Consultancy Limited | Administrative & support | 1996 |
| Retro Sports Cars Ltd | Wholesale & retail | 2012 |
| Reubens Deli Ltd | Hospitality | 2024 |
| RG Electrical Contractors Ltd | Construction | 2024 |
| RG Home Developments Ltd | Construction | 2024 |
| RH Bespoke Ltd | Manufacturing | 2023 |
| RH Retail Ecom Ltd | Wholesale & retail | 2023 |
| Rhapsody Earlsfield Limited | Hospitality | 2026 |
| Rhapsody Pubs & Bars Limited | Hospitality | 2026 |
| Rhapsody Southwark Limited | Hospitality | 2026 |
| Rhee Consultancy Ltd | Professional & scientific | 2026 |
| Richard Tattersall Limited | Construction | 2016 |
| Richardson Consulting (Manchester) Limited | Other services | 2010 |
| Ridesafe Limited | Education | 2010 |
| Ridley Property Projects Limited | Real estate | 2024 |
| Ridwans Takeaway Ltd | Hospitality | 2026 |
| RJW Mechanical Services Ltd | Manufacturing | 2020 |
| RMK Building & Developments Ltd | Construction | 2023 |
| RMK Rentals Ltd | Real estate | 2024 |
| Rmpm Contracting Limited | Professional & scientific | 2019 |
| Rnhbarber Ltd | Other services | 2026 |
| Robbie Barr Entertainment Ltd | Arts & recreation | 2023 |
| Robinson MAY Investments Ltd | Households | 2022 |
| Rocksteady Group Limited | Manufacturing | 2022 |
| Rojo Properties Limited | Real estate | 2004 |
| Rolla Distribution Systems Limited | Professional & scientific | 1975 |
| Rolla Holdings Limited | Financial services | 2018 |
| Rolla Limited | Manufacturing | 1950 |
| Roodduke Limited | Wholesale & retail | 2008 |
| Rooted FIG Limited | Professional & scientific | 2024 |
| Rose Speech Therapy Limited | Health & social care | 2022 |
| Rowley Utilities Ltd | Construction | 2023 |
| RP Brighouse Limited | Hospitality | 2022 |
| RP Events Ltd | Professional & scientific | 2012 |
| RPT Services Ltd | Professional & scientific | 2024 |
| Rr.Truck Service Ltd | Transport & logistics | 2023 |
| RS Spice Ltd | Hospitality | 2026 |
| RSH Developments Ltd | Extraterritorial | 2020 |
| Rsmithutilityservices Limited | Construction | 2025 |
| Rsrey Limited | Wholesale & retail | 2024 |
| Rsth Property One Ltd | Real estate | 2024 |
| RTL Investments Limited | Information & communication | 2020 |
| Rtmv Jain Limited | Real estate | 2009 |
| Russetglow Limited | Real estate | 1987 |
| RX Coal Limited | Wholesale & retail | 2026 |
| Ryecorn Wholefoods Limited | Wholesale & retail | 2010 |
| S & O Fabrications Limited | Manufacturing | 2002 |
| S B Splint Limited | Health & social care | 2018 |
| S.Barber & Son's Ltd | Real estate | 2017 |
| S.G. Castings (Nelson) Limited | Manufacturing | 1983 |
| S3 Support Services Ltd | Professional & scientific | 2022 |
| Sabre Instrument Valves Limited | Manufacturing | 1991 |
| Safety Inspection Solutions Limited | Manufacturing | 2012 |
| Saffron Kashmiri Cuisine Ltd | Hospitality | 2024 |
| Sagko Limited | Real estate | 2025 |
| Sales Fuel Ltd | Construction | 2014 |
| Salutem Services Limited | Construction | 2023 |
| Samuel Gledhill & Sons Limited | Mining & quarrying | 1949 |
| Sander-Shade Blinds Limited | Manufacturing | 1985 |
| Sandy & Bielby Limited | Health & social care | 2014 |
| Satec Company Limited | Professional & scientific | 2015 |
| Sawyer Bros. (Bookmakers) Limited | Arts & recreation | 1999 |
| Sawyer Inns Ltd | Hospitality | 2023 |
| Scott Houlahan Ltd | Professional & scientific | 2024 |
| Screot Ltd | Financial services | 2024 |
| Seahouses Coastal Retreats Ltd | Real estate | 2026 |
| Seahouses Retreats Ltd | Real estate | 2020 |
| Sentinel Digital Services Ltd | Information & communication | 2025 |
| Servable Ltd | Information & communication | 2020 |
| Sessions Label Solutions Limited | Manufacturing | 2010 |
| Shampooch Pet Services Limited | Other services | 2016 |
| Shaw Consulting Ltd | Information & communication | 2010 |
| Shells Brighouse Ltd | Hospitality | 2019 |
| Sherwood Enterprises (London) Limited | Administrative & support | 2014 |
| Showstock Limited | Wholesale & retail | 1992 |
| Shrmm Ltd | Real estate | 2023 |
| Siddall & Hilton Products Limited | Manufacturing | 1997 |
| Signature CBD Co. Limited | Wholesale & retail | 2023 |
| Silent Site UK Ltd | Other services | 2018 |
| Simply Flowers Brighouse Ltd | Wholesale & retail | 2025 |
| Simply Freight Ltd | Transport & logistics | 2019 |
| SJA Property Holdings Ltd | Households | 2022 |
| SJA Yorkshire Property Ltd | Real estate | 2016 |
| SKI Consulting Ltd | Administrative & support | 2026 |
| Skyfall Companies Limited | Financial services | 2020 |
| Sleepin Limited | Manufacturing | 2016 |
| Sleigh & Story Ltd | Professional & scientific | 2007 |
| Sliding Sash Windows Online Ltd | Administrative & support | 2023 |
| Small Building Services Limited | Professional & scientific | 2002 |
| Smart City Contractors Ltd | Information & communication | 2020 |
| Smart City Recruiters Ltd | Information & communication | 2019 |
| Smarties Nursery Limited | Education | 2015 |