| Bishop Waste Management Limited | Loughton | 2020 |
| Bishop's Skip Hire Limited | Hemel Hempstead | 1986 |
| Bishopbond Limited | Taunton | 1982 |
| Bishops Facilities Management Ltd | Billericay | 2020 |
| Bishopstone Private Water Supply Limited | London | 2020 |
| Bisley Community Composting Scheme CIC | Stroud | 2014 |
| Bison Waste Ltd | Salisbury | 2018 |
| Bison Waste Solutions Limited | Bath | 2025 |
| Bithells Waste Management Limited | Wigan | 1999 |
| Bits at Micks Limited | Nottingham | 2006 |
| Bitteswell Parva Drainage Company Limited | Lutterworth | 2011 |
| Biwater Global Ltd | London | 2026 |
| Biwater Global Solutions Ltd | London | 2026 |
| Biwater Global Supplies Limited | London | 2026 |
| Biwater Global Water Solutions Ltd | London | 2026 |
| Biwater International Limited | London | 1970 |
| Bizzi T'S Delivery and Waste Services Ltd | London | 2024 |
| Bizzle B Wasteman WID AH Movement Limited | Holborn | 2025 |
| BJ Cesspool Services Ltd | Maidstone | 2010 |
| BJ Hughes Metals (Coseley) Limited | Wolverhampton | 2008 |
| BJ Skip Hire (Wigan) Limited | Wigan | 2006 |
| BJD Metal Recycling Ltd | Walsall | 2024 |
| BJD Skip Hire Ltd | Walsall | 2024 |
| BJG Asbestos Solutions Ltd | Rochester | 2026 |
| BJL Skip Hire Limited | London | 2023 |
| BJL Waste Management Limited | Hyde | 2023 |
| BJZ Group Ltd | Bolton | 2020 |
| BJZ Services Limited | Manchester | 2019 |
| BK Skips Limited | Sevenoaks | 2012 |
| BK Trader Group Ltd | Surbiton | 2022 |
| BKB Drainage and Pest Control Limited | Buntingford | 2025 |
| BKP Waste & Recycling Ltd | Romsey | 2008 |
| BL Oils Limited | Carnforth | 2000 |
| BL Skip Hire Limited | Belfast | 2026 |
| BL Waste Management Limited | Belfast | 2026 |
| Blaby Skip Hire Ltd | Rugby | 2006 |
| Black - Lake Recycling Limited | London | 2019 |
| Black Country Asbestos Contracts Limited | Stourbridge | 2016 |
| Black Country Grab Limited | Bilston | 2019 |
| Black Country Skip Hire Limited | West Midlands | 2003 |
| Black Country Vehicle Disposal Limited | Walsall | 2026 |
| Black Hole Bins Ltd. | Orpington | 2026 |
| Black Line Security Limited | Wimborne | 2019 |
| Black Mountain Mineral Water Company Limited | Herefordshire | 1994 |
| Black Pear Environmental Ltd | Birmingham | 2014 |
| Black Range Limited | Sheffield | 1965 |
| Black Rock Environmental Associates Limited | Bradford | 1998 |
| Black Skips Limited | London | 2012 |
| Black-Ram Recycling Limited | Highbridge | 2005 |
| Blackburn Skips Limited | Burnley | 2014 |
| Blackburns Waste Disposal Limited | Dewsbury | 1996 |
| Blackfield Land Limited | London | 2015 |
| Blackfinch Limited | | 1994 |
| Blackline LDN Group Ltd | Bury St. Edmunds | 2026 |
| Blackpole Metals Limited | Worcester | 2013 |
| Blackpole Re:Source Limited | Kidderminster | 2025 |
| Blackpole Recycling Limited | Manchester | 2006 |
| Blackpool Skip Hire Limited | Thornton-Cleveleys | 2003 |
| Blackpool Skips Limited | Blackpool | 2016 |
| Blackpool Waste Services Limited | Blackpool | 2018 |
| Blackshaw Landfill Limited | Brighouse | 2008 |
| Blacksmith Consulting Services Ltd | Rustington | 2022 |
| Blacksmith Initiative (UK) | London | 2007 |
| Blackstone Environmental Limited | Billingshurst | 2023 |
| Blackstone Garden Waste and House Maintanence Limited | Abertillery | 2023 |
| Blackstone Sustainability Ltd | Billingshurst | 2024 |
| Blackwater (North East) Ltd. | Cleckheaton | 2009 |
| Blackwater Agri Services Limited | Grimsby | 2018 |
| Bladecycle Solutions Ltd | Newry | 2025 |
| Blair Drilling Limited | Macclesfield | 2003 |
| Blairs Contracts NL Ltd | Airdrie | 2025 |
| Blaise Renewables Limited | Ashford | 2018 |
| Blake Solutions Ltd | Maidenhead | 2024 |
| Blake Waste Management Ltd | Norwich | 2025 |
| Blakedown Services Limited | Dudley | 2006 |
| Blandford Drains Ltd | Wimborne | 2016 |
| Blara Energy Limited | Wennington | 2009 |
| Blbb Consulting Limited | Rugby | 2016 |
| BLC Environmental & Industrial Cleaning Ltd | Glasgow | 2022 |
| Blench Skip Hire Ltd | Luton | 2025 |
| Blenkinsop Water Treatment Consultancy Ltd | Weymouth | 2022 |
| Blessed Water Initiative Ltd | Colne | 2026 |
| Blew Site Services Ltd | Dartford | 2025 |
| Blink and It's Gone Limited | Johnstone | 2025 |
| Blisswell Trading Ltd | London | 2023 |
| Blitz Cleans Limited | London | 2015 |
| Blitz Recycling Limited | Cardiff | 2012 |
| Blitz Skips Limited | Cardiff | 2012 |
| BLK Clinical Limited | Glossop | 2017 |
| BLK Powder Limited | Glossop | 2017 |
| BLL Tankers Ltd | Wickford | 2021 |
| Block Waste Management Limited | Chesterfield | 2021 |
| Blockade Demolition Limited | Horley | 2011 |
| Blockade Services Limited | Worthing | 2007 |
| Blockage Busters London Ltd | London | 2025 |
| Blockage Busters Ltd | Enfield | 2020 |
| Blockage Inspectors Ltd | London | 2023 |
| Blockbusters Contracts Limited | Lewes | 1994 |
| Blockbusters Environmental Services (NI) Limited | Newry | 2014 |
| Blocked Drain MID Ltd | Leicester | 2025 |