| BID Nominees Limited | Huddersfield | 2020 |
| BID Profession Initiative Ltd | Chichester | 2022 |
| Bidams Management Consultant and Business Analyst Limited | Romford | 2014 |
| Bidayet Almasar Ltd | Manchester | 2023 |
| Bidco Koru Limited | Manchester | 2020 |
| Biddingmax Limited | Edgware | 2008 |
| Biddington Holdings Limited | Crewe | 2019 |
| Biddle Rail Ltd | Crewe | 2025 |
| Biddluph Nails Ltd | London | 2020 |
| Bide Projects Ltd | Hayes | 2024 |
| Bide Sauna Ltd | Glasgow | 2024 |
| Bideford Barber Ltd | Bideford | 2026 |
| Bidefordconnex CIC | Bideford | 2022 |
| Bident Ltd | Glasgow | 2018 |
| Bidfield Farm Barns Management Company Limited | Nr Sheepscombe | 2001 |
| Bidford Taxis Ltd | Bristol | 2017 |
| Bidford Turkish Barbers Ltd | Alcester | 2024 |
| Bidmark Group Ltd | London | 2026 |
| Bidness Associates Ltd | Harrogate | 2015 |
| Bidoff Limited | London | 2017 |
| Bidston Moss Car Wash Ltd | Manchester | 2019 |
| Bidwedge Limited | Royston | 2017 |
| Bidwell Flats Management Company Limited | Wembley | 1984 |
| Bidwell Professional Hairstylist Limited | Brighton | 2011 |
| Biemp Ltd | Crawley | 2017 |
| Bien & Myrna Express Cargo UK Ltd | Liverpool | 2017 |
| Bien (Irby) Limited | Wirral | 2015 |
| Bien Beauty Limited | Wirral | 2015 |
| Bien Hair & Beauty Limited | Wirral | 2003 |
| Bien Hair and Beauty (Irby) Limited | Wirral | 2015 |
| Bien Hair and Beauty (Upton) Limited | Wirral | 2015 |
| Bien Minh Ltd | Leicester | 2023 |
| Bien-Etre Boxing Ltd | Reading | 2023 |
| Bienstar Health Ltd | London | 2025 |
| Bientecs Ltd | Liverpool | 2008 |
| Bienvenue Relocation Network Ltd | London | 2018 |
| Biergama Services Ltd | London | 2019 |
| Bierley Community Association Limited | Bradford | 2010 |
| Biesrem Limited | Tilbury | 2016 |
| Biffa Argyll & Bute Holdings Limited | Cambuslang | 2001 |
| Biffa Argyll & Bute Ltd | Cambuslang | 2000 |
| Biffa BDR Limited | High Wycombe | 2011 |
| Biffa Cumbria Ltd | High Wycombe | 2009 |
| Biffa Sutherland Tattoos Limited | Northallerton | 2019 |
| Bifolco Matty Limited | Windsor | 2018 |
| Bifrostech Software Ltd | London | 2020 |
| Big Al's Barber Shop Limited | Wirral | 2017 |
| Big Area Holdings Limited | Canterbury | 2020 |
| Big BAD Customs Ltd | Belfast | 2021 |
| Big BAD Gym Ltd | Cardiff | 2025 |
| Big Bang Events Ltd | Nottingham | 2019 |
| Big Bear Buys Ltd | Stoke-On-Trent | 2022 |
| Big BEN Chauffeurs Ltd | Staines-Upon-Thames | 2009 |
| Big BEN Tower Hong Kong Ltd | Windsor | 2017 |
| Big Blind Ltd | Bury | 2026 |
| Big Blue Frog Ltd | Sheffield | 2026 |
| Big Blue Ocean Cleanup CIC | York | 2024 |
| Big Blue Power Limited | Wirral | 2004 |
| Big Bong Connection London Ltd | London | 2025 |
| Big Book Media Limited | Horsham | 1990 |
| Big Bopper Entertainment Limited | Kettering | 2011 |
| Big Boss Barber Ltd | Exeter | 2023 |
| Big Boss Gardening Ltd | Belvedere | 2023 |
| Big Boss Salon Ltd | Leicester | 2020 |
| Big Box Little Box Storage Limited | Coleford | 2016 |
| Big Box Self Storage Ltd | Bromley | 2026 |
| Big Boys Toys Comps Limited | Cardiff | 2024 |
| Big Brand Marketing Ltd | Bicester | 2022 |
| Big Brands Storage Limited | Olney | 2020 |
| Big Brands U.K. Ltd | Chichester | 2022 |
| Big Brother Watch Limited | London | 2009 |
| Big Brothers Big Sisters UK Foundation | Wallingford | 2019 |
| Big Brothers Club Ltd | Birmingham | 2025 |
| Big Bucks Limited | Manchester | 2021 |
| Big Burd Beauty Ltd | Ayr | 2023 |
| Big City Music Limited | London | 1970 |
| Big Content Media Ltd | Manchester | 2018 |
| Big Cookie Ltd | Buckingham | 2014 |
| Big Creative Education Foundation | London | 2026 |
| Big D Self Storage Limited | Benfleet | 2014 |
| Big D'S Tattoo Ltd | Chester Le Street | 2024 |
| Big Daddy's Doggy Daycare Ltd | Neath | 2024 |
| Big Dave Property Maintenance and Facilities Management Limited | Bristol | 2025 |
| Big Day Music Ltd. | Glasgow | 2008 |
| Big Developers Limited | London | 2017 |
| Big Dog Fellas Limited | Bradford | 2023 |
| Big Dog Services Limited | Beccles | 2023 |
| Big Dog Technology Ltd | Coulsdon | 2024 |
| Big Dog Walker Widnes Ltd | Widnes | 2021 |
| Big DOM Limited | Luton | 2022 |
| Big Door Productions Ltd | Exeter | 2017 |
| Big EGO Limited | London | 2023 |
| Big Events Birmingham Ltd | Birmingham | 2015 |
| Big Fish Construction Limited | Frodsham | 2020 |
| Big Fish Group Holdings Limited | Runcorn | 2022 |
| Big Fish Group Limited | Runcorn | 2019 |
| Big Five Films Limited | London | 1967 |
| Big Flash Car Wash Ltd | Colwyn Bay | 2024 |
| Big GAY OUT UK C.I.C. | Thame | 2023 |
| Big Guys - French Fries Street Food Ltd | Rye | 2023 |