| Quids Bookkeeping Ltd | Professional & scientific | 2026 |
| Quiet Miaow Limited | Arts & recreation | 2013 |
| Quiettech Ltd | Manufacturing | 2025 |
| Quilio Ltd | Information & communication | 2022 |
| Quilt BIO Limited | Professional & scientific | 2024 |
| Quintory Commercial LLP | | 2024 |
| Quintory Estates Limited | Real estate | 2017 |
| Quirky and Clever Limited | Wholesale & retail | 2025 |
| Quite Frankly Productions Limited | Information & communication | 2003 |
| Quite Great Limited | Other services | 1999 |
| Quite Stream Ltd | Information & communication | 2024 |
| Quonsilium Consulting Limited | Professional & scientific | 2015 |
| Quor Group Limited | Information & communication | 2011 |
| Quorate Ltd | Information & communication | 2026 |
| Quorvex Media Ltd. | Professional & scientific | 2026 |
| Qupic Limited | Professional & scientific | 2021 |
| Quplex Ltd | Administrative & support | 2026 |
| Qureight Limited | Professional & scientific | 2018 |
| QUY Court Management Company Limited | Households | 2006 |
| QUY Farms Limited | Agriculture & fishing | 1979 |
| QUY Investments Limited | Real estate | 2018 |
| QUY Properties Limited | Real estate | 2014 |
| QUY Tech Limited | Construction | 2026 |
| QV Aerosolutions Ltd | Manufacturing | 2025 |
| Qwings Ltd | Manufacturing | 2024 |
| QY Holdings Limited | Real estate | 2019 |
| R & R Property (London) Ltd | Real estate | 2024 |
| R & R Roofing Specialist Ltd | Construction | 2024 |
| R a & H (Bourn) Limited | Real estate | 2018 |
| R a & H Limited | Real estate | 2010 |
| R a Farm Services Limited | Manufacturing | 2025 |
| R B Electrical (Cambridge) Limited | Construction | 2003 |
| R B Sports Ltd | Arts & recreation | 2017 |
| R H Lynn Consultancy Limited | Professional & scientific | 2017 |
| R H Partnership EOT Limited | Administrative & support | 2020 |
| R H Racing Limited | Wholesale & retail | 2009 |
| R Hetherington Property Ltd | Real estate | 2017 |
| R I M Horses International Limited | Arts & recreation | 2025 |
| R J Cameron Limited | Construction | 2019 |
| R J Edwards & Sons Ltd | Transport & logistics | 2002 |
| R J Pepper & SON Ltd | Other services | 2003 |
| R M Bainbridge Limited | Construction | 2023 |
| R S & E Holdings Ltd | Financial services | 2025 |
| R Street Management Limited | Information & communication | 2003 |
| R Wilson Developments Limited | Construction | 2026 |
| R&A Brother Agricultural Limited | Wholesale & retail | 2023 |
| R&B Stringing Limited | Wholesale & retail | 2022 |
| R&C Industrial Limited | Professional & scientific | 2012 |
| R&C International Co., Ltd | Wholesale & retail | 2022 |
| R&E London Ltd | Wholesale & retail | 2023 |
| R&H Healthcare Ltd | Health & social care | 2014 |
| R&I Property Partners Ltd | Real estate | 2025 |
| R&J Developments Limited | Real estate | 2018 |
| R&T Properties Cambridge Ltd | Construction | 2021 |
| R. & H. Wale Limited | Construction | 1933 |
| R. Polito Limited | Other services | 2018 |
| R.C.P Engineering Services Ltd | Manufacturing | 2017 |
| R.D. Solutions for CNC Ltd | Manufacturing | 2026 |
| R.J.C. Construction Limited | Construction | 1987 |
| R.N Maintenance Ltd | Manufacturing | 2023 |
| R2J Smart Company Ltd | Other services | 2019 |
| R2K Properties Ltd | Real estate | 2024 |
| R3 Letts Ltd | Real estate | 2025 |
| RA Prime Ltd | Financial services | 2025 |
| Ra&H Histon Limited | Real estate | 2022 |
| Ra&H Holdings Limited | Financial services | 2021 |
| Rabbitsoft Ltd | Information & communication | 2008 |
| Race Performance Engineering Ltd | Professional & scientific | 2018 |
| Rachel Hutchinson Ltd | Professional & scientific | 2010 |
| Rachel Stroud Ltd. | Arts & recreation | 2020 |
| Racines International Ltd. | Manufacturing | 2018 |
| Racing Quest (UK) Limited | Arts & recreation | 2017 |
| Rackwallace Management Services Limited | Construction | 2019 |
| RAD SEO Ltd | Information & communication | 2012 |
| Radarch Limited | Professional & scientific | 2017 |
| Radbee Ltd. | Information & communication | 2013 |
| Radclanne Designs Ltd | Wholesale & retail | 2023 |
| Radda Brand Limited | Professional & scientific | 2008 |
| Radda Limited | Extraterritorial | 2009 |
| Radhaniyya Trading Co. Limited | Wholesale & retail | 2026 |
| Radial Cradle Ltd | Other services | 2016 |
| Radiance Gaming Ltd | Manufacturing | 2025 |
| Radiancell Limited | Manufacturing | 2021 |
| Radiant Resin & Groundworks Ltd | Construction | 2025 |
| Radiation Protection for Healthcare LLP | | 2026 |
| Radiationmetrix Ltd | Manufacturing | 2023 |
| Radical ML Limited | Professional & scientific | 2023 |
| Radical Wave Ltd | Information & communication | 2020 |
| Radii Properties Ltd | Real estate | 2019 |
| Radioplex Limited | Information & communication | 2001 |
| Radiussquared Limited | Information & communication | 2025 |
| Radmyle Apartments Management Company Limited | Real estate | 2019 |
| Radusmw Ltd | Manufacturing | 2024 |
| Raevynn Ltd | Wholesale & retail | 2022 |
| RAEWAY10 Ltd | Wholesale & retail | 2020 |
| RAF Group Investors Ltd | Financial services | 2026 |
| RAF Mechanik Ltd | Wholesale & retail | 2025 |
| Raft Content Ltd | Information & communication | 2020 |
| Ragad Ltd | Manufacturing | 2025 |
| Rage Diagnostics Limited | Professional & scientific | 2023 |