| BJH Marine Services Ltd | Elgin | 2025 |
| BJJ Republic Ltd | Bristol | 2025 |
| BJL Welding Limited | Pontypridd | 2023 |
| BJM Design (Scotland) Limited | Hamilton | 2024 |
| Bjoro Limited | Hastings | 2024 |
| BJP Services Ltd | Belfast | 2019 |
| BJP UK Ltd | London | 2022 |
| Bjperry Ltd | Belfast | 2025 |
| Bjre Limited | Tamworth | 2022 |
| BJS (Bespoke Joinery & Shopfitters) Ltd | Higham | 2020 |
| BJS Fabrications Ltd | Leeds | 2024 |
| BJS Manufacturing UK Limited | Wednesbury | 2024 |
| BJS Powder Coating Ltd | Leeds | 2018 |
| BJT Aerotech Limited | Porthcawl | 2017 |
| Bjulaseta Botanicals Ltd | Wisbech | 2025 |
| Bjumyra Candle Ltd | Ruislip, | 2025 |
| BJW Associates Limited | | 1979 |
| BJW Computers Limited | Maidstone | 1999 |
| BK Aggtech Limited | Kent | 1992 |
| BK Bespoke Joinery Limited | Elland | 2022 |
| BK Brand Holdings Ltd | London | 2026 |
| BK Carpentry Ltd | Downham Market | 2026 |
| BK Commercial Landscaping and Ground Works Ltd | Leeds | 2023 |
| BK Custom Merch Ltd | Ilford | 2026 |
| BK Dorset Limited | Crewkerne | 2018 |
| BK Electricity Limited | Cheadle | 2020 |
| BK Fabrications & Welding Ltd | Fraserburgh | 2025 |
| BK Fitters Limited | Ripley | 2018 |
| BK Hunter Ltd | Milton Keynes | 2018 |
| BK Import and Export Ltd | London | 2026 |
| BK Manufacturers Ltd | Bradford | 2023 |
| BK Print & Consultancy Limited | London | 2020 |
| BK Print Co Ltd | Nantwich | 2026 |
| BK Realisations Limited | Glasgow | 1972 |
| BK Rogers Limited | Lowestoft | 2012 |
| BK Safety & Workwear Limited | Barnstaple | 2006 |
| BKC Intl Ltd | South Croydon | 2025 |
| Bkdanish Lustre & Lore Ltd | Manchester | 2025 |
| Bkdrp Ltd | London | 2025 |
| BKF Carwash UK Ltd | Great Dunmow | 2025 |
| BKG Leathers Limited | Cardiff | 2025 |
| BKI UK Limited | Glasgow | 2024 |
| BKK Cafe Limited | Glasgow | 2015 |
| BKM Controls Limited | Windmill Lane Denton | 2004 |
| BKM Design Services Ltd | Hinckley | 2010 |
| Bkmr Lifts Ltd | Ilkeston | 2021 |
| BKN Technical Services Limited | Liverpool | 2019 |
| BKR Plant Ltd | Thetford | 2013 |
| BKR Tech Ltd | Hounslow | 2025 |
| BKS (Made to Measure) Limited | Exmouth | 2003 |
| BKS Joinery and Flooring Ltd | Scrayingham | 2020 |
| Bksafetywear Ltd | Barnstaple | 2016 |
| BKT Engineering Ltd | Belfast | 2020 |
| BKW Corporate Ltd | Birmingham | 2026 |
| BKW Innovations Limited | Skipton | 2016 |
| BKW Instruments Limited | Manchester | 1975 |
| Bkworkwear Ltd | Barnstaple | 2016 |
| BL Cabinets Ltd | Blackburn | 2015 |
| BL Coins and Bullion Ltd | Edgware | 2025 |
| BL Drinks Ltd | Hook | 2018 |
| BL Inspection Services Ltd | Aberdeen | 2022 |
| BL Kilshaw Ltd | Hailsham | 2025 |
| BL Motorsport Fabrications Ltd | Loughborough | 2023 |
| BL Precision Ltd | Letchworth Garden City | 2000 |
| BL Watch Repair Ltd | Wolverhampton | 2022 |
| Bl,Est Life:Style Limited | Yeovil | 2004 |
| BL. Engineering Services Ltd | Croydon | 2018 |
| BL2 Local Ltd | Bolton | 2026 |
| BLA Ventilation Limited | Farnham | 2018 |
| Blabey Engineering Limited | Southampton | 2013 |
| Blache Helicopters Services Ltd | Southampton | 2017 |
| Blachere Illumination UK Limited | Glenrothes | 1994 |
| Blachford UK Ltd | Chesterfield | 2009 |
| Black & Stevenson Engineering Ltd | Esat Grinstead | 2001 |
| Black & White Fashion Limited | London | 2015 |
| Black & White Furniture Ltd | Hayes | 2024 |
| Black & White PIG Company Ltd | Caerdydd | 2015 |
| Black & White Tints Ltd | London | 2015 |
| Black Amber Group Ltd | Peterlee | 2025 |
| Black Anchor Heavy Industries Ltd | Salford | 2017 |
| Black and Callow Limited | London | 2014 |
| Black and Heale Construction Ltd | Bishop Auckland | 2022 |
| Black and Heale Timber Frames Ltd | Bishop Auckland | 2023 |
| Black and Rust Limited | Farnborough | 2025 |
| Black and Sigi Limited | Leigh-On-Sea | 2018 |
| Black and Stainless Creative Metalwork Limited | Ilkeston | 2022 |
| Black and White C N C Services Limited | Nottingham | 2012 |
| Black and White London Limited | Northampton | 2015 |
| Black and Wight Limited | Ryde | 2020 |
| Black and Yellow Systems Limited | London | 2014 |
| Black Antler Woodworking Ltd | Lanark | 2024 |
| Black Anvil Customs Ltd | St. Helens | 2026 |
| Black Arch Distillery Ltd | Larne | 2020 |
| Black Arrow Space Technologies Ltd | Swindon | 2017 |
| Black Art Designs Limited | Braintree | 2006 |
| Black Arts Casting Ltd | Newcastle-Under-Lyme | 2025 |
| Black ASH Properties Limited | Chester | 2019 |
| Black Astrum Limited | Brentford | 2011 |
| Black Aves Ltd | London | 2022 |
| Black Barn Beverages Ltd | Chelmsford | 2026 |