| Bikers Paradise Limited | Coventry | 2022 |
| BIKES2GO Limited | Market Harborough | 2017 |
| Bikeseven Limited | Canonbie | 2021 |
| Bikester Ltd | London | 2023 |
| Biketrac Limited | Liphook | 2016 |
| Biketune Ltd | Reading | 2024 |
| Bikeworks Fife Ltd | Glenrothes | 2008 |
| Bikewrench Limited | Coventry | 2016 |
| Bikini Boutique Limited | Colchester | 2017 |
| Bikini Mama Ltd | Slough | 2019 |
| Bikker Ltd | London | 2013 |
| Bikonik Ltd | Wolverhampton | 2013 |
| Bikramjeet Construction Limited | Slough | 2021 |
| BIL Group IH Limited | Calne | 2022 |
| BIL Group Limited | Wiltshire | 1991 |
| Biladi Group Ltd | Manchester | 2025 |
| Bilal Manufacturing Limited | Leicester | 2024 |
| Bilalstudiosuk Ltd | Oldham | 2022 |
| Bilanco Limited | London | 1972 |
| Bilateral Base Ltd | Norwich | 2018 |
| Bilbeny Bespoke Ltd | Bedford | 2021 |
| Bilbette Ltd | London | 2016 |
| Bilbo's Motorhomes Limited | South Godstone | 2009 |
| Bilc Florin Limited | London | 2022 |
| Bildec Associates Ltd | Petersfield | 2017 |
| Bilgan Services Limited | Melton Mowbray | 2023 |
| Bilibag Factory Ltd | Stoke On Trent | 2020 |
| Bilisim Print & Embroidery Ltd | London | 2024 |
| Bilko Promotional Merchandising Limited | | 2003 |
| Bilko's Mighty Meats Ltd | Cowbridge | 2026 |
| Bill & Artisans Ltd | Milton Keynes | 2017 |
| Bill and BEN Wine Co Ltd | London | 2025 |
| Bill Baber Limited | | 2003 |
| Bill Bennett Engineering Limited | Chipping Sodbury | 1976 |
| Bill Bird Shoes Limited | Moreton In Marsh | 2001 |
| Bill Cleyndert & Company Limited | Fakenham | 1999 |
| Bill Cork Carpentry & Joinery Limited | Shrewsbury | 2006 |
| Bill Emery Spark Erosion Limited | Bingley | 2008 |
| Bill EPS Ltd | Ilford | 2011 |
| Bill Higham Marine Ltd | Bangor | 2010 |
| Bill of Materials Ltd | London | 2025 |
| Bill Pitt Manufacturing Joinery Limited | Forfar | 2006 |
| Bill Quay Precision Engineering & Fabrications Ltd | Hebburn | 2009 |
| Bill Quay Productions Ltd | Dudley | 2025 |
| Bill Upsall (Sports) Limited | Tyne And Wear | 1979 |
| Billan Garments Limited | East Park Road | 1988 |
| Billboard Costa Ltd | Uxbridge | 2024 |
| Billboardslab Ltd | London | 2025 |
| Billericay Brewery Limited | Southend-On-Sea | 2025 |
| Billericay Brewing Company Ltd | Hollinwood | 2012 |
| Billericay Farm Services Limited | Harlow | 1948 |
| Billericay Fertiliser Services Limited | Chelmsford | 2009 |
| Billericay Fertiliser Storage Limited | Chelmsford | 2019 |
| Billericay Fireplaces Limited | Basildon | 2012 |
| Billet Brown Ltd | Selkirk | 2022 |
| Billet Engineering Ltd | Cranleigh | 2026 |
| Billet Labs Ltd | London | 2022 |
| Billet Precision Ltd | Swindon | 2024 |
| Billet World Engineering Ltd | Alfreton | 2021 |
| Billet World Ltd | Alfreton | 2016 |
| Billhouse Sheet Metal Limited | Riversway Preston | 2001 |
| Billi Arts Ltd | London | 2025 |
| Billi UK Limited | Wolverhampton | 2022 |
| Billian UK Limited | Sheffield | 2011 |
| Billiards UK Ltd | Witney | 2018 |
| Billie Grand Ltd | Margate | 2021 |
| Billie Group Ltd | Preston | 2014 |
| Billies and Tong Limited | Wells | 2015 |
| Billies Bakes Limited | Gravesend | 2025 |
| Billing and Sons,Limited | | 1900 |
| Billingham Biomass Limited | Brierley Hill | 2018 |
| Billingham Machine Company Limited | Billingham | 1997 |
| Billingham MOT Centre Limited | Stockton On Tees | 2003 |
| Billingham Sales Limited | Cradley Heath | 2017 |
| Billinghay Forge Limited | Lincoln | 2003 |
| Billinghay Sawmill Ltd | Lincoln | 2026 |
| Billington Fleet Management Limited | Barnsley | 2008 |
| Billington Foods Limited | Liverpool | 1990 |
| Billington Garden Rooms Ltd | Warrington | 2022 |
| Billington Rail Services Ltd | Crewe | 2019 |
| Billington Repairs Limited | Stafford | 2020 |
| Billington Signs Limited | Bristol | 2003 |
| Billington Structures Limited | Barnsley | 1981 |
| Billion U.K. Limited | Milton Keynes | 1988 |
| Billion Watt Ltd | Amersham | 2012 |
| Billionaer Limited | London | 2024 |
| Billionaire Juice Limited | Liverpool | 2019 |
| Billions Europe Ltd | Stockton-On-Tees | 2014 |
| Billmo Ltd | London | 2025 |
| Bills Blinds & Shutters Retail Limited | Renfrew | 2025 |
| Bills Gates Limited | Malpas | 1999 |
| Bills Group Limited | Stourbridge, | 1963 |
| Billson Steel Ltd | Kettering | 2019 |
| Billtech Mechatronics Ltd | Wolverhampton | 2020 |
| Billthebuilder Ltd | Orpington | 2026 |
| Billy Autos Ltd | Dagenham | 2023 |
| Billy Clothing MCR Ltd | Manchester | 2025 |
| Billy Craig Properties Ltd | Motherwell | 2026 |
| Billy Davidson NV Stables Limited | Co Durham | 2005 |
| Billy Davidson Pipework Services Limited | London | 2025 |