| Rhubarb Bridge Ltd | Information & communication | 2025 |
| Rhuu Logistics Ltd | Transport & logistics | 2024 |
| Rhythm Nutrition Ltd | Manufacturing | 2017 |
| Ria's Interiors Limited | Construction | 2026 |
| Riaan Investments Ltd | Real estate | 2025 |
| Riboxy Solutions Ltd | Information & communication | 2013 |
| Rica Trans Ltd | Other services | 2015 |
| Riceland 33 Ltd | Hospitality | 2023 |
| Rich Carpenters Ltd | Manufacturing | 2018 |
| Rich Famous Bespoke Ltd | Wholesale & retail | 2026 |
| Richard Clarke Marine Limited | Professional & scientific | 2012 |
| Richard Groucott Limited | Construction | 2017 |
| Richard Holland Consulting Limited | Professional & scientific | 2002 |
| Richard Marshall Wealth Management Limited | Professional & scientific | 2013 |
| Richard Peet Music Limited | Information & communication | 2022 |
| Richards Carpentry/Construction Ltd | Construction | 2011 |
| Richards Engineering Limited | Extraterritorial | 2008 |
| Richards Property Refurbishments Ltd | Construction | 2015 |
| Richardson & Cock Limited | Agriculture & fishing | 1955 |
| Richardson 426 Limited | Manufacturing | 1995 |
| Richardson Family Holdings Limited | Financial services | 2017 |
| Richardson Fit Limited | Other services | 2023 |
| Richardson Machinery Sales Limited | Wholesale & retail | 2022 |
| Richdex Limited | Health & social care | 2016 |
| Richlou Ltd | Real estate | 2022 |
| Richmark Solutions Ltd | Professional & scientific | 2018 |
| Richmond Helgiford Ltd | Real estate | 2012 |
| Richmore Project Management Ltd | Real estate | 2004 |
| Richyear Property Services Limited | Real estate | 1999 |
| Rickele Ltd | Transport & logistics | 2023 |
| Rickwood Interim Leadership Ltd | Professional & scientific | 2020 |
| Ricky Lets Ltd | Real estate | 2025 |
| Ride Right Cycle Training Limited | Education | 2024 |
| Ridgeway Garage Doors Limited | Construction | 2008 |
| RIG Commercials and Car Sales Ltd | Wholesale & retail | 2017 |
| RIG International Ltd | Construction | 2019 |
| Rigate Limited | Health & social care | 2019 |
| Rigby Commercial Services Limited | Professional & scientific | 2021 |
| Right Electrics Ltd | Construction | 2021 |
| Right Personnel Group Ltd | Administrative & support | 2024 |
| Right Property Development Ltd | Construction | 2023 |
| Right Property Limited | Real estate | 2021 |
| Right Renovation Services Ltd | Construction | 2021 |
| Rightwell Properties Limited | Real estate | 2011 |
| Rigx Ltd | Transport & logistics | 2021 |
| Riley's Automotive Ltd | Wholesale & retail | 2019 |
| Rimkai Ltd | Real estate | 2025 |
| Rimsha Investment Ltd | Real estate | 2025 |
| Rimshah Limited | Wholesale & retail | 2025 |
| Ringrose Grimsley Limited | Financial services | 2003 |
| Ringwood Crescent Residents Company Limited | Households | 2002 |
| Rinnovate Ltd | Construction | 2026 |
| Rinzal Dreams Ltd | Wholesale & retail | 2020 |
| Rippleroot Ltd | Construction | 2025 |
| Rippon B Limited | Wholesale & retail | 2020 |
| Riri&Vanii Limited | Construction | 2025 |
| Rise and Shine Day Nursery Peterborough Ltd | Health & social care | 2024 |
| Rise Property Solutions Ltd | Construction | 2020 |
| Rishi Property Ltd | Real estate | 2026 |
| Rishi Retails Ltd | Wholesale & retail | 2026 |
| Rising Stars (Peterborough) Limited | Arts & recreation | 2022 |
| Risk Control Experts Ltd | Administrative & support | 2013 |
| Risse Ltd | Administrative & support | 2018 |
| Ritasmart Ltd | Health & social care | 2019 |
| Ritchie Logistics Ltd | Administrative & support | 2022 |
| Rithvik Ruthra Investments Ltd | Real estate | 2023 |
| Ritzy Community Development CIC | Education | 2025 |
| Ritzy Mini Market Limited | Wholesale & retail | 2001 |
| Ritzy Studio Ltd | Other services | 2020 |
| Rivalogix TOO Limited | Information & communication | 2025 |
| Rivan Residential Care Ltd | Health & social care | 2026 |
| River Nene Power Limited | Energy | 2001 |
| Rivercircle Limited | Manufacturing | 1983 |
| Rivergate Export Import Ltd | Wholesale & retail | 2024 |
| Rivermark Property Holdings Ltd | Real estate | 2026 |
| Riverside Beads Media Ltd | Information & communication | 2015 |
| Riverside Business Park Phase One Ltd | Construction | 2015 |
| Riverside Business Park Phase Two Limited | Construction | 2018 |
| Riverside Inn Surfleet Ltd | Hospitality | 2021 |
| Riverside Property Contractors Limited | Construction | 2014 |
| Riverside Residents Association (ST. Ives) Limited | Households | 1998 |
| Riverside Rise (Allington) Residents Company Limited | Households | 2019 |
| Riverview House Freehold Limited | Households | 2017 |
| Riviera Investment Holdings Limited | Financial services | 2025 |
| Riviere Blanche Consulting Ltd | Extraterritorial | 2018 |
| Rivolve Motorworks Ltd | Wholesale & retail | 2022 |
| RIX Developments Limited | Construction | 2015 |
| Riya and Diya Ltd | Health & social care | 2021 |
| Riyadiya Properties Ltd | Real estate | 2021 |
| Rizebio Ltd | Wholesale & retail | 2025 |
| Rizq Peterborough Ltd | Hospitality | 2018 |
| RJ Jones Developments Ltd | Construction | 2024 |
| RJ Travels Ltd | Administrative & support | 2025 |
| RJB East Limited | Construction | 2003 |
| RJC Countryside Ltd | Administrative & support | 2026 |
| RJC Legal Limited | Professional & scientific | 2020 |
| RJG Commercials Ltd | Wholesale & retail | 2022 |
| RJH Courier Company Ltd | Transport & logistics | 2019 |
| RJJ1983 Ltd | Construction | 2014 |
| RJL Drainage Ltd | Water & waste | 2018 |