| Riviera Iced Tea Ltd. | Wholesale & retail | 2021 |
| RJ Ground Engineering Ltd | Construction | 2022 |
| RJE Consulting Services Limited | Professional & scientific | 2026 |
| RJS Farms Ltd | Agriculture & fishing | 2003 |
| RKF Holdings Ltd | Real estate | 2020 |
| RM Design & Marketing Limited | Professional & scientific | 2023 |
| RM Safety Solutions Limited | Professional & scientific | 2023 |
| Rmdev Limited | Real estate | 2025 |
| RMS Newark Ltd | Wholesale & retail | 2022 |
| Roadstone Recycling Limited | Water & waste | 2018 |
| Roast Beef Holdings Limited | Real estate | 2022 |
| Robert George Construction Ltd | Construction | 2024 |
| Robert Marshall & Sons Limited | Administrative & support | 2015 |
| Robert Teal Limited | Real estate | 1938 |
| Robert Townsend Electrical Limited | Construction | 1988 |
| Robertshaw Farms Limited | Agriculture & fishing | 2011 |
| Robertshaw Poultry Limited | Administrative & support | 2018 |
| Robertson Stewart Limited | Professional & scientific | 2021 |
| Robin Hood Airport Developments Limited | Construction | 2015 |
| Robin Hood Entertainment Limited | Arts & recreation | 2009 |
| Robin Wright Limited | Construction | 2022 |
| Robinson & Sons Timber Limited | Agriculture & fishing | 2012 |
| Robinsons Commercial Properties (Nottinghamshire) Limited | Real estate | 2025 |
| Rocco Property Ltd | Real estate | 2022 |
| Rock Hill Consulting Limited | Professional & scientific | 2025 |
| Rock Resource Management Limited | Manufacturing | 2017 |
| Rockingham Court Management Company Limited | Households | 2005 |
| Rocky Prospects Limited | Administrative & support | 2007 |
| ROD George Limited | Professional & scientific | 2010 |
| Rodewell Consultancy Ltd | Professional & scientific | 2022 |
| Roewood Limited | Hospitality | 2005 |
| Roger Walmsley Contracts Limited | Construction | 1995 |
| Rogerson Agri-Trade Ltd | Agriculture & fishing | 2020 |
| ROO Studio Limited | Other services | 2025 |
| ROOFING2U (Newark) Ltd | Construction | 2026 |
| ROOFING2U Ltd | Construction | 2026 |
| Rookfield Limited | Agriculture & fishing | 2023 |
| Room to Move Ltd | Construction | 2007 |
| Ropa Developments Ltd | Construction | 2018 |
| Ropamikeuk Ltd | Health & social care | 2016 |
| Ropsley Developments Limited | Construction | 2019 |
| Rosa Rosa Limited | Wholesale & retail | 2004 |
| Rosa Sparklet Limited | Real estate | 2025 |
| Rose (Newark) Estates Limited | Real estate | 2016 |
| Rose Gardens Resident Company Limited | Households | 2022 |
| Rose Orchard Limited | Hospitality | 2026 |
| Rose Terracotta Limited | Manufacturing | 2011 |
| Rosehay Properties Limited | Construction | 1990 |
| Roseland Estates Limited | Transport & logistics | 1992 |
| Roseland Park Stud Limited | Agriculture & fishing | 2018 |
| Rosimian Limited | Professional & scientific | 2008 |
| Rossington Carpets Limited | Wholesale & retail | 2016 |
| Rotanna Okoli Ltd | Health & social care | 2024 |
| Rothbury Conservation Trust | Arts & recreation | 2025 |
| Rothwell Estates Limited | Real estate | 2004 |
| Rototek Limited | Manufacturing | 2010 |
| Round Governance Services Limited | Professional & scientific | 2018 |
| Roundabout Free Community Newspaper | Information & communication | 2015 |
| ROY Hill Haulage Limited | Transport & logistics | 2014 |
| Royale Mobility Ltd | Wholesale & retail | 2014 |
| RR Detailing Ltd | Administrative & support | 2022 |
| RR Signs & Print Limited | Manufacturing | 2020 |
| RS Electrical Services (2007) Limited | Construction | 2012 |
| RS Hire Limited | Administrative & support | 2015 |
| RSC Forestry Group Ltd | Agriculture & fishing | 2022 |
| RST Telekom Limited | Information & communication | 2026 |
| RTL (Europe) Limited | Manufacturing | 2003 |
| Rufford Consultants Limited | Professional & scientific | 2012 |
| Rufford Holdings Ltd | Real estate | 2025 |
| Rufford Homes Limited | Construction | 2025 |
| Rufford Park Golf LLP | | 2022 |
| Rufus Properties (UK) Limited | Real estate | 2003 |
| Running Horse Construction Ltd | Construction | 2018 |
| Runo Ltd | Administrative & support | 2022 |
| Runspiral Limited | Real estate | 1987 |
| Ruscal Limited | Administrative & support | 2018 |
| Rushingarrow Limited | Real estate | 2010 |
| Rushingwind Limited | Real estate | 2021 |
| Rushmoor Park (II and III) Management Company Limited | Households | 1998 |
| Russell EKE Limited | Extraterritorial | 2012 |
| Rutland Life Ltd | Wholesale & retail | 2019 |
| RW Business Development Services Limited | Administrative & support | 2023 |
| RW Farming Company Limited | Agriculture & fishing | 2007 |
| RW Shot Contractor Ltd | Wholesale & retail | 2023 |
| Rydan Automation Ltd | Manufacturing | 2010 |
| Rydzyk Group Ltd | Transport & logistics | 2015 |
| S & E Timber Supplies Ltd | Wholesale & retail | 2014 |
| S & JS Consultancy Ltd | Professional & scientific | 2022 |
| S J Insulations Ltd | Construction | 2021 |
| S R Holmes & SON Ltd | Transport & logistics | 2023 |
| S R W Commercials Ltd | Wholesale & retail | 2023 |
| S S T Management Limited | Households | 1985 |
| S Y C Notts Ltd | Wholesale & retail | 2025 |
| S&B Landscapes Ltd | Administrative & support | 2020 |
| S&H Management Ltd | Construction | 2017 |
| S&P Industrial Limited | Construction | 2021 |
| S&Sco Ltd | Wholesale & retail | 2019 |
| S. Pearce Property Lettings Limited | Real estate | 2017 |
| S.Allwood & SON Limited | Wholesale & retail | 1960 |
| S.C.C. Controls Limited | Information & communication | 1996 |