| Redhills Management Company (Leeds) Limited | Real estate | 1996 |
| Redhouse Lane Communications Limited | Information & communication | 1988 |
| Reditum Capital Management Limited | Administrative & support | 2020 |
| Reditum SPV 32 Ltd | Financial services | 2017 |
| Reditum SPV 37 Ltd | Financial services | 2017 |
| Reditum SPV 39 Ltd | Financial services | 2018 |
| Reditum SPV 40 Ltd | Financial services | 2018 |
| Reditum SPV 46 Ltd | Financial services | 2018 |
| Reditum SPV 57 Ltd | Financial services | 2020 |
| Reditum SPV 58 Ltd | Financial services | 2020 |
| Reditum SPV 69 Ltd | Financial services | 2021 |
| Redkite Supplies Limited | Administrative & support | 2017 |
| Redlec Limited | Construction | 2020 |
| Redlestone Management Company Limited | Real estate | 2008 |
| Redley Electrical Services Ltd | Construction | 2014 |
| Redm | Financial services | 1998 |
| Redmayne (Nominees) Limited | Financial services | 1961 |
| Redmayne Capital Limited | Financial services | 2000 |
| Redmayne Nominees (P.E.P.) Limited | Financial services | 1986 |
| Redmayne Perth LLP | | 2009 |
| Redmayne-Bentley LLP | | 2009 |
| Rednivar Communications Ltd | Administrative & support | 2014 |
| Redox Software Ltd | Information & communication | 2006 |
| Redrise Consultancy Ltd | Professional & scientific | 2018 |
| Redruth Holdings 2 Limited | Administrative & support | 2017 |
| Redruth Holdings 3 Limited | Administrative & support | 2018 |
| Redruth Holdings 4 Limited | Administrative & support | 2018 |
| Redruth Holdings 5 Limited | Administrative & support | 2018 |
| Redruth Holdings 6 Limited | Administrative & support | 2018 |
| Redruth Holdings 7 Limited | Administrative & support | 2018 |
| Redruth Holdings Limited | Administrative & support | 2016 |
| Redsky Corporate Services Limited | Professional & scientific | 2008 |
| Redstone Manufacturing Services Ltd | Manufacturing | 2021 |
| Redstone SOL Tech Ltd | Wholesale & retail | 2016 |
| Reducer Ltd | Administrative & support | 2017 |
| Redux Retail Ltd | Wholesale & retail | 2026 |
| Redwing 4 Limited | Construction | 2023 |
| Redwing 5 Limited | Construction | 2023 |
| Redwing Block Management Limited | Hospitality | 2025 |
| Redwing Global Limited | Professional & scientific | 2026 |
| Redwing Holdings Limited | Construction | 2020 |
| Redwing Properties (2) Limited | Construction | 2021 |
| Redwing Properties (3) Limited | Construction | 2021 |
| Redwing Properties Limited | Construction | 2020 |
| Redwood Capital Holdings Ltd | Hospitality | 2024 |
| Redwood Contracting (UK) Ltd | Construction | 2023 |
| Redwood Redevelopment Ltd | Real estate | 2025 |
| Redwood Technology Ltd | Information & communication | 2009 |
| Redwood Trustees Ltd | Financial services | 2021 |
| Red’N’Greens Limited | Wholesale & retail | 2025 |
| Reeboot Property Limited | Construction | 2017 |
| Reech Health & Fitness Ltd | Arts & recreation | 2024 |
| Reed Enterprises Ltd | Administrative & support | 2024 |
| Reed Medical (Holdings) Limited | Financial services | 2018 |
| Reed Medical Limited | Manufacturing | 1991 |
| Reed Property Ventures Limited | Real estate | 2017 |
| Reedrange Ltd | Administrative & support | 2017 |
| Reeds Golf Ltd | Wholesale & retail | 2024 |
| Reedtec Ltd | Construction | 2025 |
| Reedtech Consultancy Ltd | Information & communication | 2024 |
| Reedyford Holdings Limited | Administrative & support | 2021 |
| Reef Al-Yemen Restaurant, Alnasim Branch Ltd | Hospitality | 2025 |
| Reef Ranch Publishing Ltd | Agriculture & fishing | 2022 |
| Reeg Media Ltd | Professional & scientific | 2019 |
| Reek Consult Limited | Administrative & support | 2018 |
| Reel Forge Limited | Wholesale & retail | 2025 |
| Reen Platforms Ltd | Information & communication | 2025 |
| Reena Properties Ltd | Real estate | 2022 |
| Reer Elmi Limited | Health & social care | 2015 |
| Reesdenton Limited | Real estate | 2000 |
| Reeshy Ltd | Information & communication | 2026 |
| Reesk 0 Group Ltd | Construction | 2025 |
| Reestablish | Health & social care | 2015 |
| Reet Yorkshire Food Ltd | Manufacturing | 2020 |
| Reeth Medical Limited | Health & social care | 2010 |
| Reeth Rentals Ltd | Real estate | 2019 |
| Reeves Construction Leeds Limited | Construction | 2021 |
| Reeves Property Investments Ltd | Real estate | 2022 |
| REF79 Holdings Ltd | Financial services | 2024 |
| REF79 Ltd | Real estate | 2024 |
| Referbits Limited | Wholesale & retail | 2023 |
| Refill and Go Ltd | Wholesale & retail | 2019 |
| Refill Collective Ltd | Wholesale & retail | 2025 |
| Refinco Limited | Financial services | 2024 |
| Refine Auditing Solutions Limited | Professional & scientific | 2024 |
| Refine Ltd | Arts & recreation | 2025 |
| Refined and Radiant Aesthetics Ltd | Other services | 2016 |
| Refined Reverie Ltd | Professional & scientific | 2025 |
| Refinery Games Limited | Information & communication | 2021 |
| Refinish Distribution Ltd | Wholesale & retail | 2025 |
| Reflect Design & Build Limited | Construction | 2015 |
| Reflect Visuals Ltd | Information & communication | 2020 |
| Reflections Community Support | Health & social care | 2010 |
| Reflex ARC Ltd | Information & communication | 2011 |
| Reforma Club Limited | Arts & recreation | 2025 |
| Reforma Ltd | Arts & recreation | 2025 |
| Reforward AI Ltd | Information & communication | 2026 |
| Refract Productions Limited | Professional & scientific | 2023 |
| Refractiv Limited | Information & communication | 2012 |
| Refractive Media Limited | Information & communication | 2007 |