| Pointons Site Services Ltd | Meriden | 2021 |
| Poise Cleaning Services Ltd | Gloucester | 2023 |
| Polding Construction Limited | | 1999 |
| Polihim-Ss UK Limited | Dartford | 2014 |
| Polimer Industries Ltd | London | 2025 |
| Polish Waste Movers Ltd | Uxbridge | 2023 |
| Polished Performance Limited | Bristol | 2002 |
| Polkacrest Midlands Limited | Marlow | 1993 |
| Poll Trans Ltd | Bicester | 2024 |
| Pollard Services (2001) Limited | St. Ives | 2001 |
| Polo Polymer Limited | London | 2019 |
| Polvenna Limited | Truro | 2025 |
| Poly and Paper Ltd | Blackburn | 2020 |
| Poly DAN Ltd | South Shields | 2023 |
| Polycycle Global Limited | Birmingham | 2024 |
| Polycycle Solutions Ltd | Derby | 2024 |
| Polyforce Ltd | Abergavenny | 2025 |
| Polyfuel (N.I.) Limited | Belfast | 2017 |
| Polymer Floor Sweeps Recovery Ltd | Chorley | 2023 |
| Polymer Matters Limited | Omagh | 2022 |
| Polymer Recovery UK Ltd | Nottingham | 2017 |
| Polymer Resource Limited | Armagh | 2017 |
| Polymer Resource Management Limited | Armagh | 2017 |
| Polymer Services Ltd | Ashford | 2024 |
| Polystar Plastics Recycling Limited | Southampton | 2021 |
| Polywaste UK Ltd | Wigan | 2011 |
| Poma International Services Ltd | London | 2018 |
| Ponmani Services Limited | Hayes | 2019 |
| Pontardulais Skip Hire Limited | Swansea | 2017 |
| Ponte Capital Ltd. | Leicester | 2019 |
| Pontypool Waste Disposal Limited | Pontypool | 2009 |
| POO Pickers Ltd | Barry | 2025 |
| Pool Products Limited | Halesowen | 2013 |
| Poolie Junk Monkeys Ltd | Wynyard | 2022 |
| Popa Expedition Ltd | Slough | 2025 |
| Popes Lane by Products Limited | High Peak | 2002 |
| Popit Drainage Ltd | Rochester | 2024 |
| Poplars Resource Management Company Limited | High Wycombe | 1991 |
| Poppy Services (South Ribble) Ltd | Kington | 2026 |
| Poppy's Pet Crematorium Plymouth Limited | Plymouth | 2026 |
| POPSOLUTION2007 Ltd | Barking | 2019 |
| Porcement Limited | Newton Abbot | 2022 |
| Porfa LAS CYF | Cardigan | 2017 |
| Porkys Autospares Ltd | York | 2006 |
| Port Harcon Limited | Newport | 2024 |
| Porta-Lux Solutions Ltd | Birmingham | 2024 |
| Portable Toilets Hire Ltd | Hayes | 2019 |
| Portable Welfare Ltd | Coleford | 2021 |
| Portapura Limited | Shillington | 2017 |
| Portawater UK Ltd | Leigh-On-Sea | 2013 |
| Porter Plant Ltd | Edgware | 2021 |
| Porters Associated Services Limited | Manchester | 2021 |
| Porters Metals & Skip Hire Limited | Marlborough | 2000 |
| Porthcasseg Energy Ltd | Chepstow | 2014 |
| Portishead Waste Clearance Ltd | Portishead | 2023 |
| Portland Crescent Management Services Ltd | London | 2024 |
| Portland Scrap Metal Ltd | Weymouth | 2012 |
| Portland Skips Limited | Weymouth | 2011 |
| Portland Stone Limited | Weymouth | 1995 |
| Portsdale WMS Holdings Limited | Ellesmere Port | 2025 |
| Portsmouth Mini Skips Ltd | Portsmouth | 2023 |
| Portsmouth Water Limited | Havant | 1990 |
| Portstewart Motorcycle and ATV Recycling Ltd | Portstewart | 2013 |
| Portway Plant Limited | Birmingham | 1999 |
| Porvar Limited | Weybridge | 2019 |
| Poseidon Water Treatment Ltd | Luton | 2022 |
| Post Prior Partners Ltd | London | 2018 |
| Potter's Hazardous Waste Services Ltd | Gillingham | 2022 |
| Potter's Insulations Limited | Manchester | 1948 |
| Potteries Demolition Company Limited | Stoke On Trent | 1970 |
| Potteries Waste Limited | Newcastle | 1997 |
| Potters (Midlands) Limited | Telford | 2017 |
| Potters Environmental Limited | Southam | 2017 |
| Potters Waste Services Ltd | Welshpool | 2020 |
| Pottventic Ltd | London | 2025 |
| Poundarena Ltd | Croydon | 2019 |
| POW Property Asbestos Limited | Bournemouth | 2025 |
| POW Skips Limited | Leicester | 2022 |
| Power Junk Ltd | London | 2024 |
| Power Recovery Solutions Ltd | Leigh-On-Sea | 2021 |
| Power ROD (Home Counties) Limited | Harrow | 2015 |
| Power Waste Management Limited | Brentwood | 2025 |
| Powerbetter Developments Limited | Oulton | 1988 |
| Powerday PLC | London | 1980 |
| Powered by POO Ltd | Alloa | 2025 |
| Poweroy Environment Care Solutions Ltd | Bristol | 2022 |
| Powertankers Ltd | Colchester | 2025 |
| Powley & Gray Ltd | London | 2019 |
| Powys Environmental Limited | Llandrindod Wells | 1990 |
| Pozitive Water Limited | London | 2017 |
| PP Environmental Ltd | Market Harborough | 2022 |
| PP O'Connor Aggregates and Recycling Limited | Bury | 2016 |
| PP O'Connor Enviro Limited | Bury | 2010 |
| PPA Handyman Limited | Wrexham | 2022 |
| Ppcrecycling Ltd | Ilkeston | 2018 |
| PPE Recycling Limited | Nr Bridgnorth | 2020 |
| PPL BHAM2 Ltd | Nuneaton | 2025 |
| PPP Group Holding Company Limited | Ballymena | 2017 |
| PPP Group Tyre Recycling Limited | Ballymena | 2018 |
| PPP Salvage Limited | Ballymena | 2017 |