| BHG Holdings Limited | Sutton Coldfield | 2019 |
| BHG Leisure Group Limited | Tarporley | 2014 |
| Bhiindi X Limited | Loughton | 2019 |
| Bhlh Property Ltd. | Coventry | 2020 |
| Bhpt Limited | Lancaster | 2024 |
| BHR Assist Insurance Services Limited | London | 2019 |
| BHU Yachting Ltd | Bromley | 2024 |
| Bhuk Drainage Limited | East Ham | 2021 |
| Bhuk Roofing Limited | East Ham | 2021 |
| Bhutan Ltd | London | 2019 |
| BHX Group Ltd | Birmingham | 2019 |
| BI (Top) Services Limited | Peterborough | 2017 |
| BI 2 Limited | Glasgow | 2025 |
| BI GAS Supplies Limited | Chesterfield | 2012 |
| Bi-Oli Limited | Stevenage | 2010 |
| BI8 Limited | Northwood Hills | 2021 |
| BIA Rebel Limited | Belfast | 2016 |
| Bianca DE Sousa Ltd | Margate | 2017 |
| Biaopai Limited | Weston-Super-Mare | 2020 |
| Biard Construction Ltd | Horley | 2024 |
| Biasol (UK) Ltd | Brighouse | 2025 |
| BIB Limited | Faringdon | 1957 |
| Bibbidi Bobbidi BOO Ltd | Sheffield | 2023 |
| Bibblon Renewables Limited | Kilmarnock | 2014 |
| Bibby & Legge Limited | Bridport | 2000 |
| Bibby Logistics Limited | Bolton | 2013 |
| Bibby Trader Limited | Liverpool | 1993 |
| Bibi Blangsted Ltd. | London | 2017 |
| Bibi Consulting Ltd | London | 2017 |
| Biblehaus Limited | Newton Abbot | 2014 |
| Biblehaus Publishing Limited | Newton Abbot | 2014 |
| Bibrand Ltd | London | 2012 |
| Bibuilt Ltd | London | 2014 |
| Bibury Spring Water Limited | Cirencester | 2023 |
| BIC Investment Ltd | Kenilworth | 2019 |
| Bicc (Blackley) Ltd | Leyland | 2010 |
| Bicce Ltd | London | 2025 |
| Bicep Limited | Lincoln | 2004 |
| Bicester Eatery Ltd | Bicester | 2018 |
| Bicester Land Rovers Limited | Kidlington | 2011 |
| Bicester Windows and Doors Ltd | Bicester | 2015 |
| Bichocapo Ltd | London | 2026 |
| Bichuan Ltd | Beckenham | 2026 |
| Bickenhill Village Community 2020 Limited | Solihull | 2020 |
| Bicker FEN Energy Storage Limited | Stroud | 2001 |
| Bickerdike Allen (CDM) Ltd. | London | 1995 |
| Bickers Action Limited | Ipswich | 2016 |
| Bickershaw Assets 2 Ltd | Salford | 2017 |
| Bickershaw Assets Ltd | Salford | 2017 |
| Bickford 1964 Limited | Wolverhampton | 2013 |
| Bickley & Hill Hook Management Ltd | Birmingham | 2007 |
| Bicon Rattler Ltd | Halesowen | 2020 |
| Bicrown Developments Limited | Nottingham | 2014 |
| BID Catalyst Limited | Bury St. Edmunds | 2018 |
| BID IT UK Ltd | Newcastle Upon Tyne | 2012 |
| BID Recruitment Limited | Weybridge | 2019 |
| Bidbrook Limited | Bellshill | 1985 |
| Biddenden Tractorfest Limited | Detling | 2019 |
| Biddenham Asset Finance Limited | Bedfordshire | 1959 |
| Biddle Air Curtains Limited | Walsall | 1980 |
| Biddle Air Systems Limited | Walsall | 2022 |
| Biddle Limited | Walsall | 1955 |
| Bideford Power (UK) Limited | Scarborough | 2010 |
| Bidford Mots Ltd | Alcester | 2009 |
| Bidford on Avon Tyres Ltd | Bristol | 2022 |
| Bidmine Limited | Stroud | 1987 |
| Bidok Consulting Limited | London | 2013 |
| Bidtrix Ltd | Bristol | 2026 |
| Biedronka Limited | Portsmouth | 2007 |
| Biefbi Limited | London | 2019 |
| Bielby Transport Ltd | Leeds | 2024 |
| Biergarten Limited | Glasgow | 2016 |
| Biffa (Roxby) Limited | High Wycombe | 1986 |
| Biffa GS Environmental Recycling Limited | High Wycombe | 2003 |
| Biffa Pension Scheme Trustees Limited | High Wycombe | 1992 |
| Bifold Company (Manufacturing) Limited | Bath | 1984 |
| Bifold Fluidpower (Holdings) Limited | Bath | 2002 |
| Bifoldsales Limited | Colchester | 2022 |
| Big & Luna International Trading Ltd | Manchester | 2023 |
| Big Active Limited | London | 2026 |
| Big Al's Pizza Limited | Ballymena | 1990 |
| Big and Tall Warehouse Limited | Somerset | 2007 |
| Big ANT UK Limited | Northwood | 2014 |
| Big ASS Banners Limited | Leeds | 2014 |
| Big ASS Ltd | Harrogate | 2013 |
| Big BAD Wolf Distribution Ltd | Chichester | 2016 |
| Big Bale Company Limited | Peterborough | 2020 |
| Big Bale East Limited | Hedon | 2015 |
| Big Beach Café Ltd | Heathfield | 2025 |
| Big Bear Metals Limited | Aberdeen | 2023 |
| Big Beaver Limited | Bournemouth | 1997 |
| Big Bede Limited | Lowestoft | 2024 |
| Big BEN Safety Products Ltd | Hereford | 2015 |
| Big BEN Tower Ltd | Windsor | 2020 |
| Big BEN World Limited | Bordon | 2013 |
| Big Big International Trading Ltd | Manchester | 2023 |
| Big Blue Audio Limited | Epsom | 2009 |
| Big Blue Stuff Group Ltd | Plymouth | 2015 |
| Big Box Padel Club Limited | Liverpool | 2024 |
| Big Box Storage Solutions Limited | St Ives | 2014 |