| Red Box Hosted Solutions Limited | Information & communication | 2010 |
| Red Box Recorders Group Limited | Information & communication | 2013 |
| Red Box Recorders Innovations Limited | Information & communication | 1988 |
| Red Brick Communications Limited | Professional & scientific | 1996 |
| Red Brick Rooms Ltd | Real estate | 2021 |
| Red Bricks&Mortar Ltd | Real estate | 2025 |
| Red Button Fire Ltd | Public administration | 2019 |
| Red C Café & Restaurant Ltd | Hospitality | 2026 |
| Red Cat Properties Ltd | Real estate | 2021 |
| Red Chameleon Nottingham Ltd | Construction | 2016 |
| Red Chilli Nottm Limited | Manufacturing | 2019 |
| Red Cliff Education Ltd | Education | 2026 |
| Red District Ltd | Wholesale & retail | 2024 |
| Red Dog Transport Ltd | Transport & logistics | 2013 |
| Red Door Investments Ltd | Real estate | 2019 |
| Red Eagle One (Shipley) Limited | Real estate | 2020 |
| Red Education Ltd | Education | 2021 |
| Red Feather Photography Limited | Other services | 2010 |
| Red FOX Letting Limited | Real estate | 2017 |
| Red Group Global Ltd | Wholesale & retail | 2026 |
| Red HAT Beechdale Ltd | Hospitality | 2026 |
| Red Horizon Property Ltd | Hospitality | 2022 |
| Red IFA (Nottingham) Limited | Administrative & support | 2016 |
| Red Kite Therapeutics Limited | Health & social care | 2017 |
| Red Lane (Midlands) Limited | Construction | 2009 |
| Red Lion (Grenoside) Ltd | Hospitality | 2017 |
| Red Lion Holding Group Limited | Real estate | 2024 |
| Red Lion Thurgarton Properties Limited | Hospitality | 2018 |
| Red Monkey Limited | Information & communication | 2018 |
| Red Panda Properties Ltd | Real estate | 2023 |
| Red Peak Design Limited | Administrative & support | 2017 |
| Red Property Maintenance Services Ltd | Construction | 2024 |
| Red Reclaim Limited | Construction | 2019 |
| Red Red Frog Ltd | Professional & scientific | 2023 |
| Red Rose BHD Limited | Financial services | 2025 |
| Red Rose Project Management Limited | Professional & scientific | 2025 |
| Red Sea Car Wash Ltd Ltd | Administrative & support | 2026 |
| Red Sea Club C.I.C. | Arts & recreation | 2024 |
| Red Sea Couriers Ltd | Transport & logistics | 2022 |
| Red Sidney Management Ltd | Real estate | 2021 |
| Red Sky Architects Ltd. | Professional & scientific | 2011 |
| Red Sky Contracts Ltd | Construction | 2025 |
| Red Sky Serviced Accommodation Ltd | Real estate | 2019 |
| Red Spark Property Limited | Real estate | 2019 |
| Red Squirrel Estates Ltd | Real estate | 2026 |
| Red Squirrelz Ltd | Professional & scientific | 2023 |
| Red Umbrella Bespoke Mental Healthcare Ltd | Administrative & support | 2018 |
| Red Vape Limited | Wholesale & retail | 2014 |
| Red Wine Entertainment UK Ltd | Information & communication | 2025 |
| Red's Sports Bar Ltd | Hospitality | 2020 |
| Redainvest Limited | Real estate | 2023 |
| Redbox Technologies Ltd | Information & communication | 2016 |
| Redbricks Estates Ltd | Real estate | 2018 |
| Redcar Design Limited | Information & communication | 2003 |
| Redcar Investment and Management Limited | Real estate | 2014 |
| Redcliffe House Management Company (Nottingham) Ltd | Households | 2011 |
| Redcliffe House Management Limited | Real estate | 1997 |
| Redcoin Properties Ltd | Households | 2023 |
| Redd Mortgages Limited | Financial services | 2021 |
| Reddington PUB Company Limited | Hospitality | 2021 |
| Reddog Ales Ltd | Manufacturing | 2022 |
| Redecor Ltd | Professional & scientific | 2023 |
| Redeemed Christian Church of GOD Divine Covenant Centre | Other services | 2011 |
| Redefining Living CIC | Administrative & support | 2024 |
| Redfern Share Holdings Limited | Other services | 2015 |
| Redferns Home Movers Ltd | Transport & logistics | 2016 |
| Redgate DRY Cleaners Ltd | Other services | 2011 |
| Redhill Academy Trust | Education | 2010 |
| Redhill Car Wash Ltd | Administrative & support | 2022 |
| Redhill Garage (EM) Limited | Wholesale & retail | 2025 |
| Redhill Garage Limited | Manufacturing | 2002 |
| Redhill Marine Services Ltd | Manufacturing | 2018 |
| Redhill Productions Ltd | Information & communication | 2006 |
| Redhot Chinese Ltd | Wholesale & retail | 2022 |
| Redington Labs Ltd | Wholesale & retail | 2025 |
| Redland Accounting Limited | Professional & scientific | 2019 |
| Redline AI Ltd | Information & communication | 2026 |
| Redline Homes Ltd | Real estate | 2026 |
| Redline Property Ltd | Real estate | 2021 |
| Redmond Services UK Ltd | Professional & scientific | 2024 |
| Redrev Construction Ltd | Construction | 2025 |
| Redrox Legal Consultants Limited | Professional & scientific | 2015 |
| Reds Survey Limited | Information & communication | 2021 |
| Redshep Telco Ltd | Information & communication | 2016 |
| Redskysa Holdings LLP | | 2025 |
| Redsmith Property Limited | Real estate | 2024 |
| Redstone RIP OUT and Clearances Ltd | Water & waste | 2025 |
| Redstones Construction Limited | Construction | 2022 |
| Redwing Coaches of London Ltd | Transport & logistics | 2025 |
| Redwood Asset Management Ltd | Real estate | 2016 |
| Redwood Childcare Ltd | Health & social care | 2023 |
| Redwood Court (Nottingham) Limited | Households | 2017 |
| Redwood Estate Management Limited | Real estate | 2015 |
| Redwood Estates (UK) Limited | Real estate | 2005 |
| Redwood Joinery Contractors Limited | Construction | 2016 |
| Redwood Property Investment Holdings Limited | Real estate | 2024 |
| REE Enterprise UK Ltd | Health & social care | 2015 |
| Reed & Squeak Ltd | Wholesale & retail | 2013 |
| Reedsdale Inspections Ltd | Professional & scientific | 2024 |
| Reeena Limited | Health & social care | 2021 |