| Queens House (Woodbridge) Management Company Limited | Households | 2018 |
| Queens of the City CIC | Education | 2024 |
| Queer Confidence Coaching Ltd | Education | 2023 |
| Queeraf CIC | Information & communication | 2021 |
| Quentavix Input Weave Ltd | Information & communication | 2026 |
| Quest Furniture Ltd | Wholesale & retail | 2023 |
| Questionable People Solutions Limited | Information & communication | 2022 |
| Quibixsoft Limited | Information & communication | 2024 |
| Quick Learning Ltd | Education | 2025 |
| Quick Management Services Ltd | Professional & scientific | 2024 |
| Quick Mixology Ltd | Manufacturing | 2024 |
| Quickfreight Logistics Limited | Transport & logistics | 2015 |
| Quickstep Removals Ltd | Transport & logistics | 2025 |
| Quintesson Limited | Information & communication | 2016 |
| Quipra Limited | Wholesale & retail | 2025 |
| Quiquor Ltd | Wholesale & retail | 2025 |
| Quokkaville Limited | Manufacturing | 2025 |
| Quote GUY Ltd | Information & communication | 2025 |
| Qurra Islamic Centre Ltd | Other services | 2025 |
| QXM Property Ltd | Real estate | 2023 |
| Qyoot Kulture Limited | Manufacturing | 2012 |
| Qyrex Ltd | Wholesale & retail | 2025 |
| R & C Motorcycles Ltd | Wholesale & retail | 2019 |
| R & J Catering (Hertfordshire) Limited | Hospitality | 2013 |
| R & M Property Solutions Ltd. | Construction | 2013 |
| R & R Design Services (UK) Ltd | Construction | 2012 |
| R & R Facilitation Ltd | Education | 2024 |
| R & R Properties UK Limited | Real estate | 2007 |
| R a Chaplin Ltd | Construction | 2017 |
| R and E Property Management Ltd | Real estate | 2025 |
| R and R'S Hospitality Ltd | Hospitality | 2025 |
| R Blackman Surveys Ltd | Professional & scientific | 2023 |
| R C Adam Holdings Limited | Financial services | 2024 |
| R C Adam Limited | Professional & scientific | 2020 |
| R E Engineering 09 Limited | Professional & scientific | 2014 |
| R Hathaway & Co Ltd | Other services | 2025 |
| R J C & G H Orves Limited | Agriculture & fishing | 2019 |
| R Morris Limited | Health & social care | 2018 |
| R P Valves (EOT) Ltd | Administrative & support | 2024 |
| R Tully Ltd | Hospitality | 2025 |
| R W Healey Ltd | Agriculture & fishing | 2003 |
| R&A Anaesthesia Ltd | Health & social care | 2013 |
| R&D Tax Credit Experts Ltd | Administrative & support | 2025 |
| R&G Medical Limited | Health & social care | 2019 |
| R&L Rides Ltd | Transport & logistics | 2024 |
| R&L Trading Ltd | Wholesale & retail | 2025 |
| R&M Carpentry & Joinery Ltd | Manufacturing | 2025 |
| R&R Parking Ltd | Wholesale & retail | 2025 |
| R&T Drywall Ltd | Construction | 2019 |
| R. & J. Hogg Limited | Construction | 1996 |
| R. H. Landscapes & Maintenance Services Ltd | Administrative & support | 2019 |
| R.A.D Management Solutions Ltd | Professional & scientific | 2020 |
| R.C. and P.J. Carter Limited | Transport & logistics | 2002 |
| R.J. Upton 1987 Settlement (Kings Warren) Limited | Real estate | 2007 |
| R.K.M Bouquets Ltd | Wholesale & retail | 2021 |
| R.Kazociunas Ltd | Transport & logistics | 2025 |
| R.Meskauskas Ltd | Transport & logistics | 2021 |
| R.S. Plastering & DRY Lining Contractors Ltd | Construction | 2011 |
| R.S. Services (Lincs) Ltd | Wholesale & retail | 2019 |
| R.W. Boycott Consultancy Limited | Professional & scientific | 2017 |
| R/S GAS Services Ltd | Energy | 2020 |
| R2K Joinery Ltd | Construction | 2025 |
| R3C Technologies Ltd | Information & communication | 2025 |
| R3FUNDS Ltd | Administrative & support | 2025 |
| R3VITA Ltd | Arts & recreation | 2023 |
| R45 Ltd | Wholesale & retail | 2020 |
| R60 Holdings Ltd | Hospitality | 2023 |
| R89 Services Limited | Professional & scientific | 2023 |
| RA Nexus Ltd | Information & communication | 2025 |
| RAA Nexus Group Ltd | Information & communication | 2026 |
| Rabnex Ltd | Wholesale & retail | 2026 |
| Rachel Pitman Medical Limited | Health & social care | 2019 |
| RAD Communications Developer Ltd. | Information & communication | 2016 |
| Radamec Broadcast Systems Limited | Professional & scientific | 1957 |
| Radek and Co Limited | Health & social care | 2009 |
| Radiant Horizon Enterprises Ltd | Wholesale & retail | 2024 |
| Radish Media Ltd | Information & communication | 2023 |
| Raduga Learning Centre Ltd | Administrative & support | 2025 |
| Radxone Technology Limited | Information & communication | 2011 |
| RAE Alchemy Limited | Manufacturing | 2025 |
| Raffic Designs Ltd | Information & communication | 2023 |
| Raffis Courier Services Ltd | Transport & logistics | 2025 |
| Rafire Solutions Ltd | Construction | 2021 |
| Ragamuffin Ballroom Ltd | Information & communication | 2023 |
| Ragdoll Books Ltd | Information & communication | 2026 |
| Ragilbury Roots Limited | Construction | 1998 |
| Ragnight Ltd | Wholesale & retail | 2026 |
| Ragtaglondon Limited | Information & communication | 2026 |
| RAI Property Ventures Limited | Real estate | 2023 |
| Rainbone Ltd | Financial services | 2024 |
| Rainbow Arch Limited | Hospitality | 2018 |
| Rainbow Fish Ltd | Information & communication | 2018 |
| Rainmaker Consulting Group Ltd | Financial services | 2023 |
| Rainmaker Ltd | Professional & scientific | 2023 |
| Rainstick Limited | Information & communication | 1997 |
| Rainwater Recycling Limited | Construction | 2016 |
| Rajendraleela Limited | Health & social care | 2026 |
| Rakha Trading Ltd | Wholesale & retail | 2025 |
| Rakrise UK Ltd | Wholesale & retail | 2025 |
| Rakuyou Ltd | Information & communication | 2023 |