| PSC LJP 2015 Limited | Information & communication | 2015 |
| PSP Photographic Ltd | Other services | 2012 |
| Psydro Limited | Information & communication | 2017 |
| Pure Blue Light LLP | | 2022 |
| Pure Evil Gallery Limited | Administrative & support | 2014 |
| Pureflow Solutions Ltd | Manufacturing | 2024 |
| Purezza Foods Limited | Manufacturing | 2018 |
| Purgen Ltd | Construction | 2025 |
| Purnell Classic Limited | Wholesale & retail | 2003 |
| Purple Horizons Limited | Wholesale & retail | 2016 |
| Q&F Limited | Hospitality | 2017 |
| QA Explorer Ltd | Professional & scientific | 2026 |
| QLX Holdings Ltd | Financial services | 2024 |
| Quality Fire Protection Services Limited | Public administration | 2025 |
| Quantum Building Ltd | Construction | 2018 |
| Quantum Consultancy Solutions Ltd | Professional & scientific | 2024 |
| Quarter Digital Ltd | Information & communication | 2022 |
| Qube Catering Equipment Limited | Hospitality | 2003 |
| Qubera Limited | Administrative & support | 2024 |
| Quill Construction Ltd | Construction | 1999 |
| Quorvex Consulting Ltd | Professional & scientific | 2023 |
| Qur’Anic Roots Ltd | Education | 2022 |
| R B Landscapes Services Limited | Construction | 2020 |
| R D Carpentry Limited | Construction | 2014 |
| R Foreman Brickwork Limited | Construction | 2026 |
| R H Broking Limited | Financial services | 2011 |
| R J Curtis Ltd | Construction | 2018 |
| R2R Partners Ltd | Administrative & support | 2025 |
| R8BD Properties & Development Group Limited | Real estate | 2024 |
| Rabbit Inns Limited | Hospitality | 2025 |
| Rage Ain’T Love Original Limited | Wholesale & retail | 2023 |
| Railscape Group Holdings Limited | Financial services | 2021 |
| Railscape Holdings Limited | Financial services | 2011 |
| Railscape Limited | Transport & logistics | 1997 |
| Railscape Properties Limited | Real estate | 2023 |
| Railscape Technologies Holdings Limited | Financial services | 2021 |
| Railscape Technologies Limited | Other services | 2010 |
| Raisanka Limited | Real estate | 2006 |
| Rale Property Holdings Limited | Real estate | 2025 |
| Ramonyx Limited | Financial services | 2012 |
| Rancco Ltd | Administrative & support | 2017 |
| Randa Bennett Ltd | Professional & scientific | 2013 |
| Randlogistics Limited | Extraterritorial | 1999 |
| Randstad Site Solutions Ltd | Construction | 2022 |
| Ranom Limited | Real estate | 1954 |
| Rapscallionsuk Limited | Administrative & support | 2015 |
| Raptor Services (South East) Ltd | Administrative & support | 2019 |
| Raptor Services Ltd | Professional & scientific | 2008 |
| Rave Ready Ltd | Wholesale & retail | 2024 |
| RAW Wood Limited | Construction | 2006 |
| Rawstorn Gardens (Colchester) Management Ltd | Households | 2012 |
| Raykam Ltd | Real estate | 2024 |
| Rayleigh Bike Centre Ltd | Wholesale & retail | 2025 |
| Rayleigh Career Guidance Company Limited | Education | 2011 |
| Rayleigh Developments and Holdings Limited | Construction | 2019 |
| Rayleigh Express Limited | Wholesale & retail | 2023 |
| Rayleigh Eyecare Ltd | Wholesale & retail | 2022 |
| Rayleigh F.C. Limited | Arts & recreation | 2023 |
| Rayleigh Florist Ltd | Wholesale & retail | 2020 |
| Rayleigh Foot Clinic Limited | Health & social care | 2025 |
| Rayleigh Freight Forwarding Limited | Other services | 2010 |
| Rayleigh Fruit N VEG Ltd | Manufacturing | 2010 |
| Rayleigh Grange Trading Services Limited | Health & social care | 1993 |
| Rayleigh Hair Limited | Other services | 2013 |
| Rayleigh Hi-Fi Sound & Vision Limited | Wholesale & retail | 1999 |
| Rayleigh Ltd | Hospitality | 2019 |
| Rayleigh Marketing Limited | Administrative & support | 2024 |
| Rayleigh Mobile Ltd | Construction | 2024 |
| Rayleigh MOT Centre Ltd | Administrative & support | 2016 |
| Rayleigh Motor Storage Ltd | Transport & logistics | 2019 |
| Rayleigh Nails Spa LN Ltd | Other services | 2018 |
| Rayleigh Party & Gift Shop Ltd | Wholesale & retail | 2022 |
| Rayleigh Physiotherapy Limited | Health & social care | 2018 |
| Rayleigh Programmes Limited | Wholesale & retail | 2015 |
| Rayleigh Render Systems Ltd | Construction | 2023 |
| Rayleigh Rochford and District Association for Voluntary Service | Health & social care | 2005 |
| Rayleigh Schools Trust | Education | 2013 |
| Rayleigh Vineyard | Other services | 2013 |
| Rays Heating and Electrics Limited | Professional & scientific | 2006 |
| RB Renewables Limited | Professional & scientific | 2023 |
| RBH Ltd | Real estate | 2024 |
| RCD Property Services Ltd | Real estate | 2024 |
| RCE Commercial Garden & Grounds Maintenance Ltd | Administrative & support | 2025 |
| RCM Building and Groundworks Ltd | Administrative & support | 2014 |
| RCM Landscape and Design Ltd | Administrative & support | 2020 |
| RCS Lettings Ltd | Real estate | 2017 |
| RDM International LLP | | 2013 |
| RDM UK Consultancy Limited | Administrative & support | 2018 |
| Red Bamboo Accommodation Ltd | Real estate | 2019 |
| Red Blizzard Ltd | Extraterritorial | 2016 |
| Red Ragdoll Limited | Information & communication | 2010 |
| Red Realisations (2025) Limited | Professional & scientific | 2003 |
| Red Robin Fire Limited | Public administration | 2026 |
| Redcastle Construction Limited | Construction | 2012 |
| Reds EN Route Transport Ltd | Transport & logistics | 2026 |
| Redwood and Green Consultancy Ltd | Professional & scientific | 2024 |
| Redwood Business Investments Limited | Transport & logistics | 2023 |
| Redwood Independent Financial Advisers Limited | Financial services | 2024 |
| Redwood Insurance Brokers Limited | Financial services | 2001 |
| Refined Hair Colour Specialists Limited | Other services | 2024 |