| Overton Water Community Interest Company | Chesterfield | 2023 |
| Ovolia Ltd | Bradford | 2023 |
| Ovonis Limited | Lichfield | 2025 |
| OVS Services Ltd | Leatherhead | 2023 |
| OVS Waste Management Ltd | Leatherhead | 2019 |
| Owen UK Limited | Colwyn Bay | 1994 |
| OWS Drainage and Plumbing Services Ltd | Liverpool | 2018 |
| Owu-Com Company Limited | Birmingham | 2021 |
| OX Locations Ltd | Buckingham | 2025 |
| Oxfam Activities Limited | Oxford | 1964 |
| Oxford Direct Services Trading Limited | Oxford | 2017 |
| Oxford Grab Hire Ltd | Abingdon | 2023 |
| Oxford Mobile Skips Ltd | Oxford | 2017 |
| Oxford Wood Recycling Ltd | Abingdon | 2005 |
| Oxfordshire Drain Services Limited | Wantage | 2013 |
| Oxfordshire Fuels Limited | Banbury | 2010 |
| Oxi-Tech Solutions Limited | Exeter | 2017 |
| Oxidane Compliance Ltd | Swansea | 2023 |
| Oxiflo Limited | Ilford | 2015 |
| Oxload Ltd | Dagenham | 2026 |
| Oxon Cleaning Services Ltd | Oxford | 2020 |
| Ozone Efficiency Ltd | Walsall | 2015 |
| P & a Environmental Limited | Stockport | 2018 |
| P & D Burrisson Recycling Ltd | Weston-Super-Mare | 2010 |
| P & D Green Waste Limited | Hereford | 2014 |
| P & D Material Recovery Ltd | Leigh-On-Sea | 2016 |
| P & HB Limited | Buckingham | 2020 |
| P & J Metals Ltd | Coventry | 2018 |
| P & M Boyce Limited | Slough | 2006 |
| P & P Drainage Ltd | Belfast | 2019 |
| P & P Waste Movers Ltd. | Romney Marsh | 2014 |
| P & R Waste Management Limited | Blackmore | 2014 |
| P a Moody Recycling Limited | Gateshead | 2005 |
| P and T Moore Limited | Herefordshire | 2007 |
| P B Donoghue (Waste Management) Limited | Watford | 2011 |
| P B Donoghue Construction (Watford) Limited | Watford | 2015 |
| P D Construction & Plant Ltd | Denbighshire | 2007 |
| P D J Glazing Limited | Sheffield | 2008 |
| P Eveleigh Waste Management Limited | Barry | 2026 |
| P Farrow and Sons Limited | Scarborough | 2005 |
| P G Metals Limited | | 2006 |
| P J & Sons Services Limited | Aldershot | 2023 |
| P J Brown & Sons Limited | Hemel Hempstead | 2018 |
| P J Doolan Cutting Services Ltd | Sheffield | 2019 |
| P J Jevons Limited | Rotherham | 2003 |
| P J Plant & Equipment Limited | Barnsley | 1998 |
| P J Recycling Limited | Aldershot | 2010 |
| P J Skips Limited | Lisburn | 2005 |
| P LEE Waste Management Limited | Carlisle | 2024 |
| P M Hinder and Sons Ltd | Bristol | 2012 |
| P Quigley and SON Limited | Omagh | 2015 |
| P R Junior Limited | Manchester | 2013 |
| P&B Management Ltd | London | 2019 |
| P&R Pallets Ltd | Nottingham | 2025 |
| P&W Waste Solutions Ltd | Cotgrave | 2016 |
| P-Metals Limited | Cardiff | 2022 |
| P. Fitzsimmons Limited | Fareham | 2002 |
| P. H. Chandler (Leyland) Limited | Centre White Moss Businesspark | 1963 |
| P. Johnson & SON (1976) Limited | Warlingham | 1976 |
| P. LEE (Waste Oils) Limited | Carlisle | 1998 |
| P.C. Textile Wipers Limited | Denny | 1998 |
| P.C.M. Drainage Ltd | Bridgend | 2024 |
| P.E. Metals Limited | Bilston | 1997 |
| P.Et-Al Tech Ltd | Hull | 2026 |
| P.H Scrap Metal Collections Limited | Waterlooville | 2021 |
| P.H. Byproducts Ltd | Ongar | 2020 |
| P.J. Burke Properties Limited | Marden | 1987 |
| P.J. Cole (Southern) Limited | Godalming | 1996 |
| P.J. Products Limited | Polegate | 1998 |
| P.J.M.R.R Limited | Milford Haven | 2025 |
| P.V. O'Neill Limited | Batley | 1952 |
| P.W. Tanking Services Ltd | Bakewell | 2020 |
| PA Plant & Recycle Limited | Reading | 2019 |
| Pack&Attack Removals Ltd | London | 2025 |
| Packaged Feedstocks Limited | Milton Keynes | 2025 |
| Packaged Group Limited | Milton Keynes | 2015 |
| Packaging Recycling UK Limited | Barnsley | 2008 |
| Packaging Reuse & Disposal Services Ltd | Wigan | 2010 |
| Packaging Waste Solutions Ltd | Wembley | 2024 |
| Packco Handling Limited | Middlewich | 2006 |
| Packit & Go UK Ltd | Chorley | 2021 |
| Packshare Ltd | Falmouth | 2018 |
| PAF Recycling Ltd | Coventry | 2026 |
| Page & Co the Clearance Company Ltd | Ilminster | 2021 |
| Pailton Drainage Association Ltd. | Rugby | 2003 |
| Paisley Auto Breakers (Paisley) Ltd | Paisley | 2022 |
| Pajo Grab & Skip Hire Limited | London | 2024 |
| PAK 5 Star Ltd | Glasgow | 2019 |
| Pakoaway Ltd | Southall | 2024 |
| Palincore Ltd | Belfast | 2024 |
| Palindrome Consultancy Ltd | London | 2026 |
| Palladian Healthcare Limited | Blackpool | 2015 |
| Pallet Brothers Limited | Portsmouth | 2021 |
| Pallet Recycling Services UK Limited | Swansea | 2008 |
| Pallet Solution Leicester Limited | Leicester | 2026 |
| Pallets 4 U Limited | Milton Keynes | 2014 |
| Palletworld Scotland Ltd | Paisley | 2012 |
| Pallinc Limited | Lincoln | 2015 |
| Pallister & Co Ltd | Ashington | 2012 |
| Palm Environmental Ltd | Sunderland | 2018 |