| Rachel Roberts Limited | Other services | 1998 |
| Racing 6 Ltd | Arts & recreation | 2017 |
| Racing Technique Limited | Manufacturing | 2002 |
| Rack.Computer Ltd | Wholesale & retail | 2020 |
| Racksovino Ltd | Manufacturing | 2018 |
| Radar Festival CIC | Education | 2024 |
| Radiance Beauty & Tanning Limited | Other services | 2014 |
| Raffa Production Limited | Wholesale & retail | 2020 |
| Railway Arms (Alton) Limited | Hospitality | 2022 |
| Rainmac Limited | Professional & scientific | 1993 |
| Raistone Ltd | Information & communication | 2017 |
| Ranch Farm LLP | | 2023 |
| Rapley Consulting Ltd | Financial services | 2025 |
| Raynorhall Limited | Arts & recreation | 2009 |
| Rayzume Limited | Manufacturing | 1995 |
| Razor Clam Brewing Company Limited | Manufacturing | 2020 |
| RB Perfusion Limited | Health & social care | 2024 |
| RCD Management Services Limited | Professional & scientific | 2014 |
| Reach Connectedness CIC | Other services | 2024 |
| Read Asset Management Ltd | Financial services | 2026 |
| Readymades Framing Limited | Manufacturing | 2008 |
| Realise Harmoni Ltd | Real estate | 2021 |
| Rebel and Soul UK Ltd | Professional & scientific | 2012 |
| Rebel Dread Distribution Limited | Professional & scientific | 2018 |
| Red Bushes Management Company Ltd | Households | 2007 |
| Red Dog Aviation Ltd | Education | 2021 |
| Red DOT Communications Ltd | Administrative & support | 2021 |
| Red Rose PUB Management Limited | Hospitality | 2023 |
| Redcat Aviation Services Ltd | Education | 2011 |
| Redcop Cctv Limited | Administrative & support | 2014 |
| Reddings & Co Limited | Professional & scientific | 2017 |
| Redemptorist Publications | Information & communication | 1996 |
| Redhall Engineering Services Limited | Manufacturing | 1998 |
| Rediweld Traffic Products Limited | Manufacturing | 2022 |
| Redrock Tree Care Ltd | Agriculture & fishing | 2024 |
| Redvision Cctv Limited | Administrative & support | 2000 |
| Reedbut Group Limited | Manufacturing | 2007 |
| Reedbut Holdings Limited | Manufacturing | 2019 |
| Refair Services Limited | Professional & scientific | 2024 |
| Refocus Communication Ltd | Professional & scientific | 2018 |
| Regent Vale Investments Limited | Construction | 2026 |
| Regional Letting Ltd | Real estate | 2025 |
| Regmore Limited | Professional & scientific | 2016 |
| Reheat Aero Limited | Manufacturing | 2020 |
| Reigate (T) Hairdressing Limited | Other services | 2020 |
| Relahall Limited | Real estate | 2001 |
| REM & Co Rigging Limited | Arts & recreation | 2025 |
| Rendezvous Securities Limited | Financial services | 1949 |
| Renfrew Strategic Consulting Ltd | Information & communication | 2010 |
| Rentafridge Limited | Other services | 2019 |
| REO Research Ltd | Professional & scientific | 2012 |
| Repair & Engineering Limited | Manufacturing | 2012 |
| Replay Research Limited | Professional & scientific | 2021 |
| Repost Hire Limited | Administrative & support | 2024 |
| Request Services Limited | Health & social care | 1999 |
| Resilient Numbers Limited | Information & communication | 2012 |
| Resolveuk Limited | Information & communication | 2024 |
| Resonance Records Ltd | Hospitality | 2020 |
| Restring My Racket Ltd | Wholesale & retail | 2020 |
| Retro Race Car Ltd | Wholesale & retail | 2013 |
| Revolution Joinery Ltd | Manufacturing | 2022 |
| Revolution-Zero Europe Ltd | Manufacturing | 2023 |
| RG Electrical, Mechanical & Environmental Services Limited | Administrative & support | 2021 |
| RGJ Enterprises Limited | Professional & scientific | 2015 |
| RH Waste Container Services Limited | Water & waste | 2003 |
| Rhodium Global Ltd | Transport & logistics | 2024 |
| Richmond (T) Hairdressing Limited | Other services | 2016 |
| Rickier Asset Management Limited | Professional & scientific | 2012 |
| Rigel Jenman Ltd | Professional & scientific | 2023 |
| Riordan Jewellers Ltd | Manufacturing | 2011 |
| Risky Business (Knutsford) Limited | Professional & scientific | 1995 |
| Riversdale Consultancy Ltd | Professional & scientific | 2023 |
| Riverwood (Four Marks) Limited | Households | 2013 |
| RJM Hairdressing Ltd | Other services | 2017 |
| RM Plastering Solutions Limited | Construction | 2010 |
| Robert Bruce Decorators Limited | Construction | 2018 |
| Robinjade Limited | Financial services | 2004 |
| Robinsons Educational Consulting Ltd | Education | 2013 |
| Robson Properties Limited | Real estate | 1946 |
| Robur Ventures Limited | Professional & scientific | 2022 |
| Rockdog Properties Limited | Real estate | 2025 |
| Rockit Engineering Limited | Professional & scientific | 2024 |
| Rockwater Media Limited | Information & communication | 2024 |
| Rockwater Media Ventures Ltd | Information & communication | 2025 |
| ROD Gaskin Limited | Manufacturing | 1994 |
| Roftek Holdings Limited | Manufacturing | 2021 |
| Roger Smith Distillery Ltd | Manufacturing | 2023 |
| Roknrollah Ltd | Wholesale & retail | 2025 |
| Roman Trucks (Developments) Limited | Wholesale & retail | 1995 |
| Romeo Property Holdings Ltd | Real estate | 2018 |
| Ronnie Baxter - UX Design Limited | Information & communication | 2016 |
| Rooba Limited | Wholesale & retail | 2015 |
| Rooms for Therapists (Chiswick) Ltd | Health & social care | 2019 |
| Rooms for Therapists Ltd | Professional & scientific | 2019 |
| Rosebery Mayfair Residents Company Limited | Households | 1985 |
| Rosie Ennever Ltd | Professional & scientific | 2023 |
| Rosie’S Aesthetics Limited | Other services | 2025 |
| Rosonica Ltd | Wholesale & retail | 2008 |
| Rossair Building Services Limited | Construction | 2026 |
| Rossair Group Limited | Financial services | 2024 |