| Isorb Technology Limited | Leatherhead | 1999 |
| Israel and Sons Limited | Halesowen | 2020 |
| IT Builds LAB Limited | Luton | 2026 |
| IT Cycle Ltd | Sidcup | 2020 |
| IT Help Hub Ltd | Paisley | 2025 |
| IT Prodigies Ltd | Hull | 2021 |
| IT Remarket Limited | Farnham | 2026 |
| Italat Recycle UK Limited | London | 2016 |
| Item Recycling Limited | Cardiff | 2007 |
| ITR Global Limited | Farnham | 2008 |
| Itsd Ltd | London | 2022 |
| Iulius Recycling Ltd | Birmingham | 2019 |
| Iunblockdrains Ltd | Peacehaven | 2018 |
| Ivaaz Limited | Manchester | 2019 |
| Ivan Removals Ltd | Rotherham | 2018 |
| Ivanov Combined Services (ICS) Ltd | Dungannon | 2024 |
| Iver Recycling Limited | Buckinghamshire | 2001 |
| IVL Flow Control Limited | Birmingham | 2023 |
| Ivor White Limited | Twickenham | 1962 |
| Ivory Crest Ltd | London | 2025 |
| Ivory I.T.E.R. Ltd | London | 2025 |
| Ivydene Trading Limited | Newmarket | 2026 |
| Iwater Group Limited | London | 2018 |
| IWR Global Ltd | Liverpool | 2023 |
| IWT Enterprises Limited | Manchester | 2017 |
| Iwtm-Uk Ltd | Wallington | 2019 |
| Izzet Leaking Ltd | Stanford-Le-Hope | 2023 |
| J & a Young (Holdings) Limited | Corby | 2001 |
| J & B BIO Limited | Doncaster | 2014 |
| J & B Recycling Limited | Doncaster | 1994 |
| J & B Skip Services Ltd | Warrington | 2011 |
| J & F Drainage Limited | Thornton-Cleveleys | 2014 |
| J & F Powner Limited | Hinckley | 2006 |
| J & G Environmental Limited | Fareham | 1998 |
| J & H Sales (International) Limited | Ilford | 1990 |
| J & H Waste and Scrap Ltd | Birkenhead | 2026 |
| J & J Enright Co Limited | Liverpool | 2001 |
| J & J Plastics Ltd | Tamworth | 2013 |
| J & L Drainage Ltd | Polegate | 2019 |
| J & M Recycling Limited | Ampthill | 2012 |
| J & R Waste Management (NE) Ltd | Rowlands Gil | 2022 |
| J & T Drainage Solutions Limited | Crawley | 2013 |
| J a Contracts Limited | Essex | 2007 |
| J a Mitchell Haulage Limited | Birmingham | 2002 |
| J a Waste Removals (1966) Limited | Cannock | 2026 |
| J Adams Bristol Ltd | Bristol | 2025 |
| J Adams Transport Limited | Bristol | 2016 |
| J and L Waste Solutions Ltd | Portsmouth | 2025 |
| J B Services (Derby) Limited | Derbyshire | 2000 |
| J Booth Millward Plant Limited | Buxton | 2020 |
| J Brown Operations Ltd | London | 2025 |
| J Bulotiene Recycle Ltd | Sunderland | 2025 |
| J C Environmental Solutions Ltd | Kirkcaldy | 2008 |
| J C Thomas & Sons Limited | Bristol | 2002 |
| J D Drainage Ltd | Bury St. Edmunds | 2024 |
| J D Metals Limited | Telford | 2008 |
| J D Recycling Limited | Trowbridge | 2011 |
| J Drainage Ltd | Colchester | 2023 |
| J Duffy Limited | Barrow In Furness | 2013 |
| J E Goodman Limited | Milton Keynes | 2003 |
| J Edgar Limited | Rugby | 2014 |
| J Edwards Waste Management Limited | Bolton | 2006 |
| J F Metal Recycling Ltd | Tonbridge | 2026 |
| J G Rubbish Removals Ltd | Blackpool | 2025 |
| J G Waste Clearance Ltd | Sutton | 2025 |
| J Gannon Crushing & Recycled Materials Ltd | Folkestone | 2008 |
| J Gannon Recycling Limited | London | 2017 |
| J Gentlemen Waste & Removals Limited | London | 2022 |
| J Gilder Earthmoving & Aggregates Ltd | Cheltenham | 2018 |
| J Gray Property Services Ltd | Iver | 2026 |
| J H J Haulage Ltd | Slough | 2015 |
| J H Johnson Limited | Brae | 2003 |
| J H Tree & Waste Services Limited | Bradford | 2026 |
| J H Willis & SON Waste Management Ltd | Chester | 2025 |
| J Halsall & Sons Ltd | Southport | 2012 |
| J Haynes Drains Ltd | London | 2025 |
| J J B Grab Hire Ltd | Kettering | 2020 |
| J Jones and SON Limited | Devizes | 2007 |
| J K Drains Limited | Brighton | 2013 |
| J K Polymer Limited | Cheadle | 2010 |
| J M E Glass Limited | Wolverhampton | 2010 |
| J M Waste Management Limited | Bexhill On Sea | 2013 |
| J MAC (N.I.) Limited | Ballymena | 2020 |
| J Mcdonagh & Sons Limited | Bradford | 2014 |
| J Mould Ltd | Reading | 2016 |
| J Mulligan Associates Ltd | Co. Durham | 2014 |
| J Murphy Aggs Ltd | Pudsey | 2018 |
| J Murphy Truck & Plant Limited | Pudsey | 2001 |
| J N Logistics N.E Ltd | Gateshead | 2020 |
| J Napier Tipper Hire Ltd | Liverpool | 2019 |
| J P Aston Services Limited | Tamworth | 2004 |
| J P Grab Services Ltd | Belfast | 2022 |
| J P Insolvency Services Limited | Lichfield | 1976 |
| J P R Recycling Limited | Barnet | 2002 |
| J P Winstanley Ltd | Leigh | 2019 |
| J Pickup Skips Limited | Wakefield | 2017 |
| J R Amenities Ltd | Swindon | 2020 |
| J R Drainage Solutions Ltd | Belper | 2020 |
| J R Grounds Maintenance Ltd | Houghton Le Spring | 2020 |
| J R Jenkins Limited | Crieff | 2012 |