| PW Leisure Limited | Wholesale & retail | 2026 |
| PWT Hire Ltd | Administrative & support | 2026 |
| Pytoons Ltd | Wholesale & retail | 2026 |
| Qualis Possessionem Ltd | Real estate | 2019 |
| Quality Auto Services Ltd | Manufacturing | 2017 |
| Quantock Road Management Company Limited | Other services | 2013 |
| Quantum Crystal Technology Ltd | Other services | 2026 |
| Quantus AI Limited | Information & communication | 2025 |
| Quenchers Catering Ltd | Hospitality | 2017 |
| Quick Composition Limited | Administrative & support | 2023 |
| Quick Transit Ltd | Transport & logistics | 2021 |
| R & P Groupings Ltd | Financial services | 2022 |
| R & P Properties (Boston) Limited | Real estate | 2003 |
| R & S Consultancy Ltd | Real estate | 2009 |
| R B Property Developments Limited | Real estate | 2004 |
| R D & T B Church Limited | Health & social care | 2014 |
| R Dheeran Retail Ltd | Wholesale & retail | 2026 |
| R Lawson & Co Ltd. | Wholesale & retail | 1991 |
| R M Capps Limited | Agriculture & fishing | 2013 |
| R Medical Diagnostics Ltd | Professional & scientific | 2022 |
| R Medical Supplies Limited | Manufacturing | 2020 |
| R W Marine Advisor and Consultancy Services Ltd | Professional & scientific | 2022 |
| R&R Estates & Investments Limited | Real estate | 2025 |
| R-Tec Engineering (Lincolnshire) Limited | Professional & scientific | 2019 |
| R. Hardy (Vegetables) Limited | Agriculture & fishing | 1951 |
| R.G. Farms Limited | Agriculture & fishing | 1985 |
| R.S&Family Ltd | Transport & logistics | 2020 |
| Rachel Mulholland Limited | Professional & scientific | 2021 |
| Radiancy Group Limited | Health & social care | 2023 |
| Radiancy Property Limited | Financial services | 2025 |
| Radius (Wrangle) Limited | Other services | 2024 |
| Rados Transport Ltd | Transport & logistics | 2016 |
| Rafprotransport Limited | Transport & logistics | 2025 |
| Rage Modelsport Limited | Manufacturing | 2026 |
| Rail Property Investments Limited | Real estate | 2004 |
| RAJ On-Call Ltd | Health & social care | 2012 |
| Rajtrans Ltd | Transport & logistics | 2022 |
| Ralph Pocklington Limited | Agriculture & fishing | 1949 |
| Rambynas Group Ltd | Hospitality | 2013 |
| Ramo Transport Limited | Transport & logistics | 2017 |
| Rancho (Boston) Limited | Hospitality | 2019 |
| Rangar Limited | Construction | 2022 |
| Rapsberry Ltd | Information & communication | 2019 |
| Rashbridge Accountants Limited | Professional & scientific | 2025 |
| Rashleigh (Holdings) Ltd | Financial services | 2017 |
| Rashleigh Property Group Ltd | Wholesale & retail | 2024 |
| Ratkevicius Sterling Ltd | Transport & logistics | 2015 |
| Rattyfatty Ltd | Wholesale & retail | 2023 |
| RAX Commercials Limited | Wholesale & retail | 2020 |
| RAY Nash Ltd | Wholesale & retail | 2025 |
| Ray&Ro Cars Ltd | Wholesale & retail | 2021 |
| Rayan Food Ltd | Wholesale & retail | 2021 |
| Razin Group Ltd | Wholesale & retail | 2023 |
| RB Joinery Limited | Manufacturing | 2025 |
| RBF Electrical Services Ltd | Construction | 2010 |
| RC & LH (Holdings) Ltd | Financial services | 2017 |
| RC Solutions Group Ltd | Professional & scientific | 2021 |
| Rccg New Convenant Assembly Boston UK | Other services | 2025 |
| Reach OUT Clinical Ltd | Health & social care | 2008 |
| Reasonable Tax Ltd | Professional & scientific | 2025 |
| Rebel Creative Media Ltd | Professional & scientific | 2017 |
| Rebel DC Operations Limited | Transport & logistics | 2025 |
| Rebel DC Plus Limited | Transport & logistics | 2025 |
| Rebos Boston Ltd | Real estate | 2020 |
| Rebose Boston Ltd | Real estate | 2025 |
| Reco Surfaces Ltd | Manufacturing | 1993 |
| Red Arrow of Boston Limited | Transport & logistics | 2022 |
| Red House Antiques Ltd | Wholesale & retail | 2012 |
| Red House Farms (Donington) Limited | Professional & scientific | 1998 |
| Red Lion Boston Commercial Limited | Administrative & support | 2017 |
| Red Lion Boston Limited | Real estate | 2016 |
| Red Mini Limited | Real estate | 2012 |
| Redteeps Limited | Information & communication | 2019 |
| Redwall Assets Limited | Real estate | 2019 |
| Regal Windows (Boston) Ltd | Construction | 2012 |
| Regenerated Ltd | Construction | 2016 |
| Regenerative Housing Limited | Real estate | 2026 |
| Regimental Statuette Manufacturers Limited | Manufacturing | 2014 |
| Relax Inn- Charlotte House Ltd | Hospitality | 2022 |
| Relex Building Ltd | Construction | 2022 |
| Relogistic Ltd | Wholesale & retail | 2026 |
| Remdrive Ltd | Transport & logistics | 2015 |
| Remodel on Repeat Ltd | Information & communication | 2025 |
| Renown Fisheries Limited | Agriculture & fishing | 2000 |
| Renuk Ltd | Transport & logistics | 2024 |
| Replica Metal Soldiers & Models Ltd | Manufacturing | 2019 |
| Retail Assistance Ltd | Construction | 2024 |
| Retina Images Limited | Professional & scientific | 2007 |
| Retro Revellers Ltd | Arts & recreation | 2024 |
| Reva Property Management Ltd | Real estate | 2025 |
| Revell Labour Services Ltd | Administrative & support | 2019 |
| Revesby Avenue Management Company Limited | Households | 2005 |
| Revesby Estate Renewables Limited | Agriculture & fishing | 2014 |
| Revive Auto Craft Ltd | Wholesale & retail | 2024 |
| RF Refurbishments Limited | Construction | 2012 |
| RG Deliveries Limited | Transport & logistics | 2014 |
| RG Hair & Beauty Ltd | Other services | 2025 |
| RGK Roofing Ltd | Mining & quarrying | 2025 |
| Rgta Ltd | Transport & logistics | 2025 |
| Rhema Holdings Ltd | Financial services | 2025 |