| KAM Asbestos Solutions Ltd | Sunderland | 2026 |
| KAM Distribution Ltd | High Wycombe | 2026 |
| KAM Logistic Limited | High Wycombe | 2026 |
| KAM Tech Drainage Solutions Ltd | Co Durham, Bishop Auckland | 2022 |
| Kamya Consulting Limited | Aberdeen | 2004 |
| KAN Haulage Limited | Burgess Hill | 2024 |
| Kando Environmental Services UK Ltd | London | 2022 |
| Kanes Drains Ltd | Stevenage | 2024 |
| Kangaroo Skip Hire Limited | Southport | 2021 |
| Kantron (Transport) Ltd | London | 2026 |
| Kapaitn Ltd | London | 2021 |
| Karalius Metal Recycling Ltd | Widnes | 2020 |
| Karbnz Global Limited | Stevenage | 2024 |
| Karis Technical Services Ltd. | Motherwell | 2008 |
| Karl's Handyman Services Ltd | High Wycombe | 2026 |
| Karol Buczek Transport Ltd | Ipswich | 2018 |
| Karraway Environmental Ltd | London | 2014 |
| Karraway Limited | London | 1994 |
| Kartar Haulage Ltd | Hayes | 2020 |
| KAS Metal Trading Ltd | Atherton | 2008 |
| Kasgur Metals Ltd | Waltham Cross | 2021 |
| Kashmir OIL Limited | Bury | 2023 |
| Kassia Developments Ltd | London | 2019 |
| Kaug Refinery Services Limited | Birmingham | 2003 |
| Kavanagh & Mannion (Manchester) Limited | Manchester | 1995 |
| KAY & Fryer Limited | Leeds | 1962 |
| Kaylame Careconnect Limited | Leeds | 2025 |
| Kays Asbestos Removals Ltd | Bolton | 2026 |
| Kays Transport Limited | Kent | 2007 |
| KB Facilities Ltd | Cardiff | 2026 |
| KB3 Bioenergy Limited | Bristol | 2026 |
| KBA Metals Ltd | London | 2021 |
| KC Advisory Management Limited | Weston-Super-Mare | 2014 |
| KC Components Ltd | Leamington Spa | 2025 |
| KC Environmental Services Ltd | Stratford-Upon-Avon | 2024 |
| KC Haulage and Recycling Limited | Romford | 2025 |
| KC Hire & Events Limited | Thirsk | 2026 |
| KC Skip Hire & Recycling Limited | Downpatrick | 2023 |
| KCL Maintenance Ltd | Farnborough | 2026 |
| KCM Trade Waste Limited | Rotherham | 2018 |
| KCM Waste Management Limited | Rotherham | 2012 |
| KCP Environmental Services Ltd | Cumnock | 2004 |
| KCP Group Ltd | York | 2025 |
| KCS Environmental Ltd | Fishponds | 2019 |
| KCS Utilities & Groundworks Limited | Dagenham | 2020 |
| Kctradeventures Ltd | South Ockendon | 2025 |
| KCY Metal & Waste Management Limited | King'S Lynn | 2024 |
| KD Drainage Ltd | Aylesford | 2022 |
| KD Remediation Limited | Newry | 2019 |
| KD Waste Limited | Stourbridge | 2025 |
| KDC Veolia Decommissioning Services UK Limited | London | 1990 |
| KDS Recycling Limited | Hornchurch | 2022 |
| KDS Scrap Metals Limited | Padiham | 2023 |
| Kdswasteservices Ltd | Merthyr Tydfil | 2026 |
| Kealshore Limited | Liverpool | 1983 |
| Kearon Export-Import Ltd | Blackpool | 2011 |
| Keda 2002 Services Ltd | Guildford | 2018 |
| KEE Environmental Ltd | Huntingdon | 2020 |
| KEE Services Limited | Aylesbury | 2004 |
| Keenan (Recycling) Limited | Cambuslang | 2003 |
| Keenanclean Limited | Westbury-On-Severn | 2016 |
| Keencraft Site Services Ltd | Cradley Heath | 2026 |
| Keep IT Green Ltd | London | 2022 |
| Keighley Skip Hire Ltd | Bradford | 2020 |
| Keil Services Ltd | London | 2021 |
| Keith's Rubbish Clearance Limited | London | 2006 |
| Keki Clearway Ltd | Harrow | 2019 |
| Kelburn Property Clearance Ltd | Chichester | 2025 |
| Kells North West Limited | Salford | 1994 |
| Kelly Grab Hire Ltd | Nottingham | 2014 |
| Kelly Tanks Limited | Stafford | 2013 |
| Kelly Waste Ltd | Braintree | 2025 |
| Kelly's Facilities Management Ltd | Burgess Hill | 2019 |
| Kelly's Recycling Ltd | Watford | 2022 |
| Kelowna Bears Limited | Shrewsbury | 2019 |
| Kelshall Plastics Limited | Warminster | 2006 |
| KEM Grab Services Limited | Potters Bar | 2020 |
| Kemira Purton Ltd | Glasgow | 1992 |
| Kemp Waste Management Limited | Halifax | 2007 |
| KEN Allen Autowreckers Limited | Industrial Estate Morecambe | 2003 |
| KEN Thomas Site Clearance Limited | Stanley | 2007 |
| Kena Waste Management Ltd | Rotherham | 2025 |
| Kenbury Wood Limited | Exeter | 1986 |
| Kenmore Water Solutions (UK) Ltd | Motherwell | 2012 |
| Kennedy and Company Property Solutions Ltd | Leven | 2026 |
| Kennedy Water Services Limited | Alcester | 2025 |
| Kennedy's of Gosforth Ltd | Newcastle Upon Tyne | 2019 |
| Kennet Water Limited | Berkshire | 1995 |
| Kenny Waste Management Ltd. | Little Hulton, Manchester | 1999 |
| Kenny Waste Management Social Enterprise Ltd | Manchester | 2018 |
| Kennygreen Solutions Limited | Stoke On Trent | 2025 |
| Kensington Waste Limited | London | 2024 |
| Kent & Co.(Smith)Limited | Sheffield | 1920 |
| Kent & Sons Grab Services Ltd | Borehamwood | 2018 |
| Kent and London Waste Ltd | London | 2024 |
| Kent and Medway Mobile Waste Disposal and Collection Services Ltd | Sittingbourne | 2023 |
| Kent Autorecycle Limited | Middlesbrough | 2026 |
| Kent Clearance Services Ltd | Ashford | 2024 |
| Kent Clinical Waste Limited | Chatham | 2016 |
| Kent Complete Clearances Ltd | Sittingbourne | 2025 |