| Read Consultants Limited | Information & communication | 1998 |
| Read Fabrications Limited | Manufacturing | 2002 |
| Read Partners Limited | Real estate | 2018 |
| Ready Coach Bournemouth Limited | Transport & logistics | 2025 |
| READY2WORK Ltd | Administrative & support | 2016 |
| Readyup Consulting Ltd | Administrative & support | 2026 |
| Real Meat Again Limited | Wholesale & retail | 2025 |
| Real Resultsai Ltd | Professional & scientific | 2025 |
| Real-Time Radio Systems Limited | Professional & scientific | 2015 |
| Realai Technologies Limited | Information & communication | 2022 |
| Realchkn.Co Ltd | Hospitality | 2022 |
| Realcube Limited | Administrative & support | 2011 |
| Realcube Technology Limited | Administrative & support | 2012 |
| Realfreshburgers Limited | Hospitality | 2025 |
| Realised AI Ltd | Information & communication | 2026 |
| Realty Southern Limited | Real estate | 2024 |
| Rebbeck Brothers Ltd | Real estate | 2013 |
| Rebeca Porton Ltd | Health & social care | 2018 |
| Rebecca Campbell Ltd | Professional & scientific | 2020 |
| Rebecca Meddings Ltd | Arts & recreation | 2012 |
| Rebecca Vincent Consulting Ltd | Financial services | 2012 |
| Rebellion SUP CIC | Education | 2020 |
| Rebourn Ltd | Financial services | 2021 |
| Rebuild Cost Assessment Limited | Professional & scientific | 2015 |
| Recharge Renewables Ltd | Construction | 2023 |
| Recoded Recruitment Ltd | Administrative & support | 2016 |
| Recovery Records Limited | Wholesale & retail | 2022 |
| Recreate Dorset | Professional & scientific | 2012 |
| Recruit & Work Limited | Administrative & support | 2023 |
| Recruiting Resources Limited | Administrative & support | 2008 |
| Red and White Stripe Company Ltd | Financial services | 2022 |
| Red Arrow Marketing Ltd | Professional & scientific | 2025 |
| Red Barber Shop 1 Ltd | Other services | 2025 |
| Red Barn Consulting Services Ltd | Information & communication | 2025 |
| Red Boat Hire Ltd | Administrative & support | 2021 |
| Red C Developments Limited | Construction | 2017 |
| Red Cherry Events Ltd | Hospitality | 2026 |
| Red Court Management (Bournemouth) Limited | Hospitality | 1989 |
| Red Crimson Ltd | Wholesale & retail | 2015 |
| Red Heart Fund | Health & social care | 2008 |
| Red Kite Leisure Limited | Administrative & support | 1999 |
| Red Lion Swanage Limited | Real estate | 2024 |
| Red Revenue Services Limited | Administrative & support | 2014 |
| Red Sails Homecare Limited | Other services | 2012 |
| Red Security Systems Ltd | Administrative & support | 2020 |
| Red Spider Ltd | Professional & scientific | 2007 |
| Red Square Construction Ltd | Construction | 2017 |
| Red Triangle Pro Ltd | Information & communication | 2014 |
| Red Triangle Projects Ltd | Construction | 2025 |
| Red Triangle Records Ltd | Information & communication | 2018 |
| Red Triangle Songs Ltd | Information & communication | 2018 |
| Redbox Recruitment Limited | Administrative & support | 2014 |
| Redcorner Limited | Households | 1981 |
| Reddico Digital Ltd | Professional & scientific | 2020 |
| Reddico Ltd | Administrative & support | 2008 |
| Redfern Building Contractors Limited | Construction | 2016 |
| Redfocus Limited | Information & communication | 2011 |
| Redgate Investment Property Ltd | Real estate | 2026 |
| Redhill Court Freehold Limited | Households | 2004 |
| Redhill Drive Estates Ltd | Households | 2022 |
| Redhill Store Limited | Wholesale & retail | 2019 |
| Redline House Limited | Real estate | 2023 |
| Redlogico Ltd | Professional & scientific | 2023 |
| Redman Homes Limited | Real estate | 2013 |
| Redmond-Smith Ltd | Wholesale & retail | 2021 |
| Reds Cars 1892 Ltd | Transport & logistics | 2023 |
| Redside Property Maintenance Ltd | Real estate | 2018 |
| Redsock Music Ltd | Information & communication | 2025 |
| Redstone Homes Limited | Real estate | 2002 |
| Redwhite CA Limited | Information & communication | 2014 |
| Redwing Management Limited | Real estate | 1993 |
| Redwood Business Finance Ltd | Financial services | 2019 |
| Redwoods Estate Agents Limited | Real estate | 1997 |
| REE Motors Ltd | Wholesale & retail | 2024 |
| Reeb Engineering Ltd | Information & communication | 2022 |
| Reed Marine Services Ltd | Manufacturing | 2025 |
| Reefdene Ltd. | Construction | 2009 |
| Reefside Catering Limited | Hospitality | 2010 |
| Reeks Marketing Ltd | Wholesale & retail | 2022 |
| Reeves Books Limited | Wholesale & retail | 2025 |
| Refine Build Ltd | Construction | 2013 |
| Refresh Life Limited | Financial services | 2019 |
| Refurbliss Development Limited | Construction | 2025 |
| Refurbliss Homes Ltd | Real estate | 2024 |
| Regain Enterprises Ltd | Wholesale & retail | 2022 |
| Regency Lorne Park Management Co Ltd | Real estate | 2015 |
| Regency Owners Limited | Households | 2022 |
| Regency Park (24-37) Limited | Households | 2002 |
| Regency Property Surveys Ltd | Construction | 2025 |
| Regency Tower Management Company Ltd | Extraterritorial | 2013 |
| Regency Twynham Lodge Management Company Ltd | Real estate | 2016 |
| Regent Investment Properties Limited | Real estate | 2023 |
| Regent Place (Alumhurst) Management Company Ltd | Households | 2002 |
| Regents Court (Poole) Management Company Limited | Households | 1997 |
| Reggie’S Roofing Ltd | Construction | 2026 |
| Regional Drain Group UK Ltd | Water & waste | 2024 |
| Regional Drainage Services Ltd | Water & waste | 2024 |
| Regishire Limited | Transport & logistics | 1986 |
| Regius Homes Limited | Real estate | 2013 |
| Reguna Limited | Health & social care | 2026 |