| Relove Limited | Professional & scientific | 2024 |
| Relove Services Limited | Professional & scientific | 2025 |
| Reltec Investments Limited | Real estate | 2021 |
| Relycomply (UK) Limited | Information & communication | 2025 |
| Remake Technology Limited | Information & communication | 2020 |
| Remarkable Truth Ltd | Information & communication | 2014 |
| Remitech Limited | Wholesale & retail | 2018 |
| Renacs Engineering Company (UK) Ltd | Other services | 2018 |
| Renaissance Publishing | Information & communication | 2001 |
| Rendi Holdings Ltd | Financial services | 2016 |
| Renovare Holdings Ltd | Financial services | 2023 |
| Renovare Learning Services Ltd | Education | 2019 |
| Renuva Ltd | Construction | 2025 |
| Repairrite Limited | Administrative & support | 2008 |
| Repensum Limited | Wholesale & retail | 2015 |
| Republic for Vitality Ltd | Health & social care | 2020 |
| Reservoir Stags Ltd | Construction | 2025 |
| Residents of 21 Red Road RTM Company Limited | Households | 2020 |
| Resolution Optics Limited | Professional & scientific | 2002 |
| Resourced Solutions Limited | Administrative & support | 2015 |
| Respawned Limited | Information & communication | 2016 |
| Restart Media Limited | Information & communication | 2013 |
| Restaurant 1804 Limited | Wholesale & retail | 2025 |
| Resto Maintenance Ltd | Construction | 2014 |
| Resumus Glocal Partners Limited | Professional & scientific | 2025 |
| Retford Healthcare Holdings Limited | Wholesale & retail | 2025 |
| Retirement & Investment Options Limited | Financial services | 2014 |
| Retreev Limited | Wholesale & retail | 2019 |
| Revive Psychology Limited | Health & social care | 2011 |
| Reynolds House Limited | Real estate | 2017 |
| Reynolds SET Designs Ltd | Construction | 2025 |
| RF Mendoza Ltd | Transport & logistics | 2022 |
| Rfcp Limited | Financial services | 2015 |
| RG & SG Limited | Financial services | 2023 |
| Rg&Vl Limited | Construction | 2026 |
| RGA Services Ltd | Construction | 2017 |
| RGB Pages Limited | Information & communication | 2017 |
| RGS Healthcare Ltd | Health & social care | 2016 |
| RGS Plumbing & Heating Ltd | Wholesale & retail | 2025 |
| Rhemaxc Consulting Ltd | Health & social care | 2017 |
| Rheum With a View Ltd | Health & social care | 2021 |
| Rhinify Ltd | Construction | 2022 |
| RHK Limited | Arts & recreation | 2018 |
| RHS Solutions Ltd | Information & communication | 2021 |
| Ricetti Ltd | Hospitality | 2016 |
| Rich GBS Limited | Information & communication | 2022 |
| Rich Imperial Ltd | Administrative & support | 2011 |
| Rich Tax Ltd | Professional & scientific | 2022 |
| Richard III Limited | Information & communication | 1995 |
| Richard Parr Associates Ltd | Professional & scientific | 2013 |
| Richard Wright Music Limited | Arts & recreation | 1972 |
| Richard Wright Music Overseas Limited | Arts & recreation | 1972 |
| Richart Dental Studio Ltd | Manufacturing | 2007 |
| Riches House Management Company Limited | Households | 2004 |
| Richfree Limited | Real estate | 2016 |
| Ridge Garage Limited | Wholesale & retail | 2010 |
| Ridgeway Phones Limited | Wholesale & retail | 2000 |
| Ridgeway Studios Management Limited | Arts & recreation | 2000 |
| Ridgewood Consulting Limited | Agriculture & fishing | 2025 |
| Rieds RES Limited | Real estate | 2024 |
| Right Choice Property Holdings Limited | Real estate | 2010 |
| Right Choice Roofing and Driveways Ltd | Construction | 2017 |
| Right Options Ltd | Real estate | 2012 |
| Rimma Ltd | Administrative & support | 2019 |
| Rinani Holdings Limited | Information & communication | 2021 |
| Rise Design Studio Limited | Professional & scientific | 2012 |
| Rise Strategy Consulting Limited | Professional & scientific | 2025 |
| Rishi Adatia Holdings Ltd | Financial services | 2026 |
| Risk Intl Limited | Professional & scientific | 2020 |
| Rita's Cocktail Bar Limited | Hospitality | 2021 |
| Ritec International Limited | Manufacturing | 1987 |
| Rito Investments Limited | Financial services | 2023 |
| River Guide Ltd | Administrative & support | 2013 |
| River LEA Holding Company Limited | Other services | 1991 |
| Rivercrest Enterprises Limited | Hospitality | 1997 |
| Riverplace Homes Limited | Real estate | 1997 |
| Rivers Property Services Ltd | Real estate | 2018 |
| Riverside Five Limited | Real estate | 2025 |
| Riverside Garden Landscapes & Maintenance Ltd | Administrative & support | 2013 |
| Riyzeup Ltd | Wholesale & retail | 2024 |
| RJ Boxing Limited | Other services | 2019 |
| RJ Northwest Ltd | Administrative & support | 2021 |
| RJA Construction Ltd | Construction | 2020 |
| Rjiwa Properties Ltd | Households | 2025 |
| RJM Carpentry and Construction Ltd | Construction | 2019 |
| RJQ Repairs Ltd | Other services | 2022 |
| RJR Building Services Ltd | Construction | 2025 |
| RK Marki Limited | Real estate | 2023 |
| Rkdental Limited | Health & social care | 2013 |
| Rkjmm Newcastle Limited | Real estate | 2026 |
| Rkmp Investments Ltd | Real estate | 2023 |
| Rlsk Limited | Administrative & support | 2020 |
| Rltp Limited | Professional & scientific | 2017 |
| RM Electronics Limited | Wholesale & retail | 2005 |
| Rm&K Social Care Consulting Ltd | Health & social care | 2021 |
| RMA Education Group Limited | Financial services | 2022 |
| RMA Hospitality Group Limited | Financial services | 2022 |
| RMA Leisure Group Limited | Financial services | 2022 |
| RMK Holding Limited | Financial services | 2019 |
| RMR Construction Solution Ltd | Construction | 2025 |