| Question Media Limited | Information & communication | 2011 |
| Quidproclose Limited | Other services | 2026 |
| Quigley Carpentry & Construction Ltd | Manufacturing | 2025 |
| Quinq-Am Ltd | Health & social care | 2023 |
| Quotidian Limited | Wholesale & retail | 2002 |
| Qwiktyres Stevenage Limited | Wholesale & retail | 2014 |
| R & D Lets Limited | Real estate | 2008 |
| R & R Crash Repair Centre Limited | Wholesale & retail | 1990 |
| R & R Plumbing and Heating Herts Ltd | Construction | 2022 |
| R a H Associates Limited | Professional & scientific | 2004 |
| R a H Enterprises Limited | Hospitality | 2014 |
| R Charles Property Developments Ltd | Real estate | 2024 |
| R Charles Property Lettings Ltd | Real estate | 2024 |
| R Charles Property Ltd | Real estate | 2024 |
| R Events Ltd | Hospitality | 2013 |
| R G E P Limited | Professional & scientific | 2006 |
| R G Financial Planning Ltd | Financial services | 2018 |
| R H Civils and Groundworks Limited | Construction | 2018 |
| R J D M Property Services Limited | Construction | 2017 |
| R J Stone Co Ltd | Construction | 2013 |
| R K L K E L & Co Limited | Hospitality | 2017 |
| R Lancaster & Sons Limited | Construction | 2016 |
| R N D Rural Services Limited | Agriculture & fishing | 2025 |
| R W Paintball Limited | Arts & recreation | 2019 |
| R&A Entertainment Ltd | Other services | 2020 |
| R&B Toor Holdings Ltd | Real estate | 2025 |
| R&R Gallery Limited | Wholesale & retail | 2024 |
| R&R Roofing and Building Contractors Ltd | Administrative & support | 2024 |
| R. Hitchins & Co. Limited | Extraterritorial | 2003 |
| R.B.D Trans Ltd | Transport & logistics | 2013 |
| R.C.C Property Management Ltd | Real estate | 2026 |
| R.H. Logistics Limited | Transport & logistics | 2003 |
| R.T. Mujuru Services Limited | Manufacturing | 2014 |
| Rababareeb Medical Limited | Health & social care | 2022 |
| Racewars UK Ltd | Administrative & support | 2023 |
| Raceways Motorcycles & Scooters Ltd | Wholesale & retail | 2012 |
| Rachel Moses Architect Limited | Professional & scientific | 2007 |
| Racing Star Esports (UK) Limited | Information & communication | 2021 |
| Radical OD Limited | Professional & scientific | 2020 |
| RAE Aviation Services Ltd | Manufacturing | 2025 |
| Raeburn-James Services Limited | Information & communication | 2018 |
| Rafe Abrook Wedding Photography Limited | Professional & scientific | 2019 |
| Ragnar's Roamers Ltd | Administrative & support | 2020 |
| Rail Engineering Ltd | Construction | 2016 |
| Rail Ombudsman | Other services | 2022 |
| Rail Products and Services Limited | Transport & logistics | 2021 |
| Railstar Ltd | Other services | 2018 |
| Rainbowsmart Ltd | Education | 2023 |
| Raiw Mobile Business Link Ltd | Health & social care | 2023 |
| Rajeev Aggarwal Properties Ltd | Real estate | 2019 |
| Ralm Limited | Construction | 2015 |
| Ralory Ltd | Construction | 2015 |
| Ramsey Lodge Court Limited | Households | 2020 |
| Rands and SON Limited | Construction | 2015 |
| Randz Property Group Ltd | Real estate | 2021 |
| Ranine Ltd | Health & social care | 2018 |
| Rapha Scientific Ltd | Professional & scientific | 2022 |
| Rapid Aviation Freight Clearance Limited | Other services | 2015 |
| Rapid Workforce Limited | Construction | 2019 |
| Rapidai Developments Ltd | Information & communication | 2026 |
| Rapport Ventures Ltd | Professional & scientific | 2025 |
| Rare Perspective Limited | Information & communication | 2007 |
| Rastay Healthcare Limited | Health & social care | 2018 |
| Rata Transport Ltd | Transport & logistics | 2019 |
| Rath Consultancy Limited | Professional & scientific | 2025 |
| Rauf Enterprises Ltd | Wholesale & retail | 2025 |
| Ravensbourne Court (Phase 1 - Block C) Management Company Limited | Households | 2001 |
| Ravensbourne Court (Phase 2 - Block B) Management Limited | Households | 2002 |
| Ravensbourne Court (Phase 3 - Block a) Management Company Limited | Households | 2003 |
| RAW Flowers Stevenage Limited | Wholesale & retail | 2024 |
| RAW Food Coach Limited | Other services | 2019 |
| RAW Sports Marketing Consultancy Limited | Other services | 2019 |
| RAY Healthcare Ltd | Administrative & support | 2022 |
| RAY Stevens Editing Limited | Information & communication | 2015 |
| Raya Properties Ltd | Real estate | 2023 |
| Raymondrail Ltd | Construction | 2022 |
| Raymy Ltd | Wholesale & retail | 2025 |
| Rayners Contracts Limited | Manufacturing | 2018 |
| Rayquest Building Solutions Limited | Construction | 2017 |
| Rayson Development Ltd | Real estate | 2024 |
| Razorlight Holdings Limited | Financial services | 2025 |
| RB Business Consultancy Ltd | Professional & scientific | 2024 |
| RBW Estates Group Ltd | Financial services | 2021 |
| RBW Estates Management Ltd | Real estate | 2021 |
| RBW Estates Property Management Ltd | Real estate | 2021 |
| RCB Construction Ltd | Construction | 2015 |
| RCI Group 2024 Limited | Financial services | 2024 |
| RCI Group Limited | Financial services | 2021 |
| RCI Health Group Limited | Financial services | 2018 |
| RCI Operations Limited | Other services | 2023 |
| RCI Services Limited | Financial services | 2018 |
| RD Scenic Painting Ltd | Construction | 2021 |
| RDC Glass Ltd | Construction | 2009 |
| RDH Restoration and Conservation Limited | Information & communication | 2009 |
| Rdjconsultancy Ltd | Hospitality | 2022 |
| Rdjk Properties Limited | Real estate | 2018 |
| RDL Design Limited | Information & communication | 2003 |
| Re-Con Structures Limited | Construction | 2007 |
| Re:Accounts Limited | Professional & scientific | 2010 |
| Re:View Creative Ltd | Other services | 2021 |