| Nuvora Collective Ltd | Administrative & support | 2025 |
| O Soar Ltd | Professional & scientific | 2020 |
| Oak Tree Farm Products Limited | Wholesale & retail | 2012 |
| Oakstream Consulting Limited | Professional & scientific | 2015 |
| Oakwell Investments Limited | Extraterritorial | 1960 |
| Oakwell Properties Limited | Real estate | 1954 |
| Oatenvale Limited | Manufacturing | 1981 |
| OB Dorman Flooring Specialist Ltd | Construction | 2019 |
| Ocean West Properties Ltd | Real estate | 2015 |
| ODD Exhibitions Limited | Manufacturing | 2009 |
| Olivers Fish and Chips (Ilkeston) Limited | Hospitality | 2025 |
| Olympus Scaffolding Ltd | Construction | 2021 |
| Omnixenon Ltd | Information & communication | 2023 |
| Onkel MO Ltd | Wholesale & retail | 2025 |
| Only Poles and Hoses Limited | Administrative & support | 2021 |
| Optelec Limited | Wholesale & retail | 1985 |
| Optima Stratergies Ltd | Professional & scientific | 2024 |
| Opus Frames Limited | Wholesale & retail | 2011 |
| Oracle Line Ltd | Arts & recreation | 2015 |
| Organic Home Delivery Ltd | Wholesale & retail | 2024 |
| Ortoncrest Holdings Limited | Extraterritorial | 1996 |
| Os&C Consulting Ltd | Professional & scientific | 2026 |
| Osborne of Ilkeston Ltd | Manufacturing | 2000 |
| Ostara Engineering Maintenance Services Ltd | Professional & scientific | 2022 |
| OUR Crafty Place CIC | Arts & recreation | 2024 |
| Outbuildings by Design Ltd | Construction | 2019 |
| Outlaw Pictures Ltd | Information & communication | 2017 |
| Outlaw Stunts Limited | Information & communication | 2020 |
| Over the Hedge (Ilkeston) Ltd | Administrative & support | 2024 |
| Oversite Ltd | Construction | 2026 |
| Owen Carpet & Flooring Ltd | Construction | 2026 |
| P P Plant Limited | Construction | 2000 |
| P.S Mechanical Solutions Ltd | Construction | 2025 |
| P1 Composites Limited | Manufacturing | 2022 |
| P3 | Extraterritorial | 2003 |
| Pagimed Limited | Administrative & support | 2025 |
| Paint Studio Warehouse Ltd | Wholesale & retail | 2026 |
| PAN UK Hire Ltd | Construction | 2026 |
| Panelkraft Ltd | Manufacturing | 2014 |
| Paragon Martial Arts & Fitness Ltd | Education | 2024 |
| Pare Money Limited | Information & communication | 2026 |
| Park Driveways & Paving Ltd | Administrative & support | 2012 |
| Park View Home Improvements Ltd | Construction | 2003 |
| Parkside High CIC | Health & social care | 2017 |
| Parliament House Ltd | Real estate | 2009 |
| Partnerpay Ltd | Information & communication | 2019 |
| Partridge & Street Property Services Limited | Construction | 2013 |
| Pask Ltd | Transport & logistics | 2014 |
| PAT a Cake Studio Ltd | Manufacturing | 2021 |
| Patios by Paul Ltd | Administrative & support | 2021 |
| Paul Gaughan Building Consultants Limited | Professional & scientific | 2007 |
| Pawsjoy Ltd | Wholesale & retail | 2025 |
| Payroll Matters Ltd | Professional & scientific | 2023 |
| PB Prime Developments Limited | Real estate | 2024 |
| PB Prime Renovations Limited | Construction | 2024 |
| PDG Electrical Ltd | Construction | 2023 |
| PDL Fabrication Specialists Limited | Construction | 2012 |
| Peace & Beauty Limited | Other services | 2008 |
| Peak Fitness Ltd | Arts & recreation | 2014 |
| Peak Home Assist Group Limited | Health & social care | 2022 |
| Peak Home Assist Ltd | Health & social care | 2019 |
| Peak Lodge Limited | Health & social care | 2022 |
| Peak Packaging Limited | Manufacturing | 1992 |
| Peak Recruitment Solutions (Midlands) Limited | Administrative & support | 2025 |
| Peckbrook Estates Ltd | Real estate | 2024 |
| Pegasus Enforcement Services Ltd | Professional & scientific | 2019 |
| Pelham Building Services Ltd | Construction | 2018 |
| Pelham Electrical Contractors Ltd | Construction | 2016 |
| Penna Clothing Ltd | Manufacturing | 2017 |
| Pennine VA Ltd | Administrative & support | 2024 |
| Peony Hospitality Ltd | Wholesale & retail | 2023 |
| People Potential Possibilities | Other services | 1990 |
| Perfect Party Hire Ltd | Hospitality | 2026 |
| Perfectly House Proud Limited | Administrative & support | 2014 |
| Performance Nautique Holdings Limited | Financial services | 2019 |
| Performance Nautique Limited | Wholesale & retail | 2004 |
| Petals Flowers (Ilkeston) Ltd | Wholesale & retail | 2026 |
| Peters Bridal Warehouse Ltd | Manufacturing | 2014 |
| PETERSON74 Ltd | Transport & logistics | 2016 |
| Peveril House Clinic Limited | Health & social care | 2015 |
| PG Fire Safety & Joinery Ltd | Construction | 2026 |
| Phairway Civils & Groundworks Ltd | Construction | 2026 |
| Phairway Civils Groundworks Ltd | Construction | 2026 |
| Phil's Auto Electrics Ltd | Wholesale & retail | 2021 |
| Phillips Consult (Ilkeston) Ltd | Professional & scientific | 2025 |
| Phoenix NC Holdings Limited | Professional & scientific | 2025 |
| Phoenix Network Communications Limited | Information & communication | 1997 |
| Pier Homes Ltd | Households | 2024 |
| PIER2008 Ltd | Wholesale & retail | 2024 |
| Pietrzak Legacy Holdings Limited | Financial services | 2026 |
| Pink Property Developments Ltd | Real estate | 2023 |
| Piper Special Vehicles Limited | Wholesale & retail | 2017 |
| PIT & Pint Ltd | Hospitality | 2025 |
| Pixel Point Tech Ltd | Information & communication | 2024 |
| PIXEL8UK Limited | Wholesale & retail | 2023 |
| PJ Direct Ltd | Transport & logistics | 2022 |
| Plantex Trading Ltd | Administrative & support | 1996 |
| Plastic & Metal Components Limited | Manufacturing | 1993 |
| Platta Bistro Ltd | Hospitality | 2023 |
| Platta Ltd | Hospitality | 2020 |