| Bigland Properties Limited | Kendal | 1974 |
| Bigley Holdings Ltd | Glasgow | 2021 |
| Bigmazza Ltd | Lincs | 2008 |
| Bigmore Benefits Limited | Walton On Thames | 1997 |
| Bignall (Holdings) Ltd | Birmingham | 2020 |
| Bignet Limited | Dover | 2020 |
| Bignumberten Enterprises Ltd | Leeds | 2025 |
| Bigopia Limited | Brentford | 2026 |
| Bigtime Ltd | Bournemouth | 2026 |
| Bigwave Limited | London | 2015 |
| Bigwig Finance Ltd | London | 2026 |
| Bigwood Group Ltd | London | 2024 |
| BIH Nominees Limited | London | 2021 |
| BII Europe Holdings (UK) Limited | London | 2022 |
| BII Nepal Opportunities Limited | London | 1999 |
| BII RIC Europe Holdings (UK) Limited | London | 2024 |
| BII South Asia Renewables Limited | London | 2000 |
| BII Ukraine Limited | London | 2024 |
| Bijou Investments Limited | Burgess Hill | 2019 |
| Bijou Nursery Holdings Limited | Cowbridge | 2023 |
| Bijoux Adore Limited | Southall | 2024 |
| Bijsterveld Beheer Limited | Taunton | 2006 |
| Bike Holdings Limited | London | 2019 |
| Bike IT Group Limited | Waterlooville | 2026 |
| Bikepark Holdings Limited | Merthyr Tydfil | 2017 |
| Biker Group Holdings Limited | Leyburn | 2021 |
| Biker Group Ventures Limited | Leyburn | 2025 |
| Bikmo Limited | Sandycroft | 2014 |
| Bikold Holdings Limited | Ludlow | 2026 |
| BIL Bethels Investments London Limited | London | 2019 |
| BIL Group Holdings Limited | Calne | 2022 |
| BIL SHA Gym Group Ltd | London | 2025 |
| Bilals Group Ltd | Newcastle Upon Tyne | 2020 |
| Bilaman Limited | Enfield | 1989 |
| Bilan Holdings Ltd | Derby | 2021 |
| Bilbao Offshore Holding Limited | Preston | 2019 |
| Bilbao Offshore Investment Limited | Preston | 2019 |
| Bilbao Offshore Topco Limited | London | 2019 |
| Bilbas Holdings Limited | Hull | 2025 |
| Bilberry (Bristol) Ltd | Bristol | 2021 |
| Bilberry Holdings Ltd | Nottingham | 2026 |
| Bilbo Trading Limited | Inverurie | 2023 |
| Bilbrough Holdings Limited | Tadcaster | 2012 |
| Bilco Trading Limited | Wolverhampton | 2025 |
| Bilderlings PAY Limited | London | 2015 |
| Bildo Limited | Rickmansworth | 2007 |
| Bildung Capital Limited | London | 2025 |
| Bilene Limited | Poole | 2019 |
| Bilex World Limited | London | 2009 |
| Bilfinger Northwest Europe Limited | Aberdeen | 2015 |
| Bilin Holding Ltd | Ruislip, | 2025 |
| Bilingual Finances Ltd | Bournemouth | 2017 |
| Bilinscope Ltd | London | 2024 |
| Bilko Capital Ltd | Mansfield | 2026 |
| Bill Butters Windows Holdings Ltd | Yeovil | 2026 |
| Bill Cleyndert Holdings Ltd | Fakenham | 2016 |
| Bill Drew Limited | Droitwich | 2018 |
| Bill Newman Holdings Ltd | Brighton | 2024 |
| Bill Quay Albion Limited | Rainworth, Mansfield | 2017 |
| Billderpay Trustee Ltd | Ware | 2025 |
| Billerflax Holdings Limited | Sale | 2019 |
| Billericay Financial Services Limited | Rochford | 2007 |
| Billets Solutions Limited | Romford | 2019 |
| Billhouse Holdings Ltd | Preston | 2020 |
| Billicann Holdings Limited | Birmingham | 2022 |
| Billie's Fins Holdings Ltd | Pinchbeck | 2023 |
| Billig Holdings Ltd | Birmingham | 2020 |
| Billing Finance Funding Limited | Northampton | 2025 |
| Billing Finance Limited | Northampton | 1983 |
| Billing Finance Midco Limited | Northampton | 2025 |
| Billing Investments Limited | Carnforth | 2005 |
| Billingham Developments Holdings Limited | Nr Stourbridge | 2023 |
| Billingham Property Management Limited | Stockton On Tees | 2018 |
| Billings Holdings Limited | Lancing | 2025 |
| Billings Mortgage & Insurance Services Limited | Mansfield | 2017 |
| Billingsgate Market Investments Limited | London | 2009 |
| Billington (Asset) Holdings Limited | Stoke-On-Trent | 2026 |
| Billington Trading Limited | Wrexham | 2025 |
| Billingtons Properties Ltd | Glasgow | 2014 |
| Billinov Holdings Limited | Kingswinford | 2026 |
| Billion Brokers Ltd | Leigh-On-Sea | 2023 |
| Billion Global Chase Ltd | London | 2013 |
| Billion Markets Limited | Ruislip, | 2025 |
| Billion Ventures UK Ltd | London | 2025 |
| BILLION2TRILLION Ltd | Banbury | 2024 |
| Billionaire Brothers & Co Limited | London | 2020 |
| Billon Financial Ltd | London | 2016 |
| Billon Underwriting Limited | London | 1999 |
| Billones & LIN Group Ltd | London | 2026 |
| Billorian Ltd | London | 2025 |
| Bills Stores Limited | London | 2007 |
| Billy Bob's Holdings Limited | Skipton | 2017 |
| Billy BOY Holdings Limited | Barnsley | 2017 |
| Billy Grey Holdings Limited | Leeds | 2026 |
| Billy Harts Quay Holdings Ltd | Plymouth | 2025 |
| Billy Morris Holdings Ltd | Nottingham | 2020 |
| Billygroup Holdings Ltd | Quedgeley | 2025 |
| Bilney House Ltd | Louth | 2024 |
| Bilon & Stuart (Holdings) Ltd | Glasgow | 2026 |
| Bilow Capital Ltd | Cardiff | 2022 |