| Raccoon Media Limited | Information & communication | 2022 |
| Race Fuel Ltd | Wholesale & retail | 2019 |
| Race Investments Limited | Financial services | 2024 |
| Rachel Jolliffe Limited | Administrative & support | 2015 |
| Rachel's Driving Limited | Transport & logistics | 2026 |
| RAD IT Technologies Limited | Information & communication | 2023 |
| Radata Forge Ltd | Information & communication | 2025 |
| Radburn Consulting Limited | Professional & scientific | 2026 |
| Radha Property Ltd | Real estate | 2017 |
| Radiance & Glow Ltd | Other services | 2026 |
| Radiant Management Limited | Administrative & support | 2024 |
| Radium Data Ltd | Information & communication | 2004 |
| Radlett Preparatory School Limited | Education | 1973 |
| Radnage House Stables Ltd | Arts & recreation | 2013 |
| Raes Consulting Ltd | Information & communication | 2023 |
| Rafia Hussain Productions Ltd | Arts & recreation | 2025 |
| Rafine Limited | Wholesale & retail | 1984 |
| Rafiq Properties Limited | Real estate | 2017 |
| Ragamora Ltd | Manufacturing | 2021 |
| Rahab Healthcare Ltd | Health & social care | 2023 |
| Rahil Ejaz Foods Limited | Hospitality | 2017 |
| Rahman Travels UK Ltd | Arts & recreation | 2019 |
| Rail Ingen Limited | Construction | 2021 |
| Raineynotes Ltd | Arts & recreation | 2007 |
| Raingain Marsh Capital Markets Ltd | Financial services | 2019 |
| Raingain Marsh Ltd | Financial services | 2017 |
| Raja Electronics Limited | Manufacturing | 2013 |
| Rakes Progress (Gardens) Limited | Administrative & support | 2007 |
| Rakha Consultancy Ltd | Health & social care | 2018 |
| Ralph Peters & Sons Limited | Administrative & support | 1988 |
| RAM Infotek Limited | Information & communication | 2008 |
| RAM93 Properties Limited | Real estate | 2023 |
| Rambling on Coaching Ltd | Other services | 2026 |
| Ramcrete Concrete Placing Limited | Extraterritorial | 1995 |
| Ramcrete Holdings Limited | Construction | 2025 |
| Ramcrete Property Limited | Real estate | 2019 |
| Ramcrete Pumping Services Limited | Construction | 1990 |
| Randall-Thomas (Holdings) Ltd | Construction | 2024 |
| Randeep Reehal Enterprises Ltd | Education | 2024 |
| Randem Technical Services Limited | Professional & scientific | 2020 |
| Rang Food Ltd | Hospitality | 2025 |
| Rank Hovis Milling Limited | Manufacturing | 2014 |
| Rankine Trading Limited | Wholesale & retail | 2025 |
| RAP Bluebell (Abbey Court) Ltd | Real estate | 2021 |
| RAP Bluebell (Edwards Court) Ltd | Real estate | 2021 |
| RAP Building and Developments (Desborough) Limited | Construction | 2017 |
| RAP Building and Developments (Park Lane) Limited | Construction | 2018 |
| RAP Building and Developments Ltd | Construction | 2013 |
| RAP Trans Limited | Transport & logistics | 2022 |
| Rapid Rentals Ltd | Administrative & support | 2018 |
| Rareweaves Limited | Wholesale & retail | 2024 |
| Rathina IT Limited | Information & communication | 2019 |
| Rathina Limited | Construction | 2019 |
| Rathore Corporation Ltd | Wholesale & retail | 2026 |
| Raven Science Ltd | Information & communication | 2019 |
| Ravensbury Ventures Limited | Financial services | 2022 |
| Ravenshoe Management Company Limited(The) | Administrative & support | 1985 |
| Ravindra Ltd | Real estate | 2014 |
| RAW Project Management Services Ltd | Administrative & support | 2015 |
| Rawle Gammon & Baker Holdings Limited | Wholesale & retail | 1935 |
| Rawt Ltd | Real estate | 2024 |
| Rayan & Eryk-Son Ltd | Transport & logistics | 2025 |
| Raymond Good (Joiners) Limited | Construction | 1962 |
| Rayspec Limited | Manufacturing | 1997 |
| Rayy’Z Ltd | Hospitality | 2026 |
| RAZ Enterprises Ltd | Wholesale & retail | 2019 |
| RB Industrial Roofing & Cladding Ltd | Administrative & support | 2016 |
| RBP Rental Ltd | Real estate | 2022 |
| Rcuk Holdings Ltd | Wholesale & retail | 2021 |
| RD Consulting Ltd | Information & communication | 2022 |
| RDK Foods Ltd | Wholesale & retail | 2021 |
| RDR Catering Ltd | Hospitality | 2021 |
| RE Creative Ltd | Information & communication | 2022 |
| Re-X Global Solutions Limited | Administrative & support | 2020 |
| Reach 4 Care Ltd | Health & social care | 2019 |
| Reach My Fans Limited | Information & communication | 2022 |
| React Interact Ltd | Information & communication | 2019 |
| Reactus Broadcasting Corporation Ltd | Information & communication | 2020 |
| Ready SET Rent Ltd | Real estate | 2026 |
| Readyclickandgo Limited | Administrative & support | 2008 |
| Realate Limited | Professional & scientific | 2017 |
| Realgrrt Limited | Wholesale & retail | 2024 |
| Realize.Vc Limited | Financial services | 2017 |
| Realm Productions Ltd | Information & communication | 2023 |
| Reaper Shipping Ltd | Wholesale & retail | 2025 |
| Rebel Creative & Design Ltd | Professional & scientific | 2018 |
| Reboundfit CIC | Health & social care | 2021 |
| REC45 Ltd | Construction | 2025 |
| Reccom Limited | Administrative & support | 2001 |
| Receiptcare Ltd | Information & communication | 2025 |
| Reclamation and Disposal Limited | Extraterritorial | 1966 |
| Recommerce Ltd | Administrative & support | 2017 |
| Recording and Concert Engineering Limited | Administrative & support | 2010 |
| Recruitment 99 Ltd | Administrative & support | 2018 |
| Recruitment HGV Ltd | Transport & logistics | 2023 |
| Recruitment Training and Assessment Ltd | Education | 2012 |
| Rectory Gate Limited | Households | 2007 |
| Rectory Stone Limited | Manufacturing | 2014 |
| Recycled Business Furniture Limited | Wholesale & retail | 2003 |
| Recycling Squad Ltd | Water & waste | 2019 |