| Barton Villas Management Company Limited | Households | 2006 |
| Bartons Public Limited Company | Real estate | 1927 |
| Bartra Tech Limited | Real estate | 2012 |
| Bartrams Limited | Construction | 2001 |
| Barun Limited | Construction | 2014 |
| Barush Limited | Health & social care | 2005 |
| Barwick Structural Engineering Services Ltd | Professional & scientific | 2026 |
| Barwick Transport Limited | Transport & logistics | 2008 |
| Barznjy Ltd | Other services | 2024 |
| BAS Eats Ltd | Hospitality | 2026 |
| BAS Refrigeration Limited | Professional & scientific | 2024 |
| Basavci Property Holdings Limited | Real estate | 2024 |
| Base 51 | Education | 1991 |
| Base by Realto Ltd | Real estate | 2018 |
| Base Lettings Limited | Real estate | 2017 |
| Base Town Properties Ltd | Real estate | 2024 |
| Baselab CIC | Arts & recreation | 2024 |
| Baseleg Ltd | Education | 2025 |
| Baseplate Studios Limited | Information & communication | 2025 |
| Baseserv Limited | Information & communication | 2014 |
| Basford Auto Limited | Wholesale & retail | 2020 |
| Basford Autocentre Ltd | Wholesale & retail | 2016 |
| Basford Autos Garage Ltd | Wholesale & retail | 2026 |
| Basford Book Club Ltd | Wholesale & retail | 2025 |
| Basford Edge Properties Ltd | Real estate | 2025 |
| Basford Foods Ltd | Hospitality | 2022 |
| Basford Garage Limited | Wholesale & retail | 2018 |
| Basford Management Company Limited | Households | 2003 |
| Basford Recovery & Storage Limited | Transport & logistics | 2025 |
| Basford United Community Football Club CIC | Arts & recreation | 2015 |
| Basford United Football Club Limited | Arts & recreation | 1981 |
| Basharat Care Homes Ltd | Health & social care | 2022 |
| Basharat Holdings Ltd | Real estate | 2024 |
| Basheer SON Logistics Ltd | Transport & logistics | 2023 |
| Basher Watts Racing Club Ltd | Arts & recreation | 2024 |
| Basher Watts Racing Management Limited | Professional & scientific | 2025 |
| Basher Watts Racing Marketing Ltd | Professional & scientific | 2024 |
| Basher Watts Racing National Hunt Syndicates 2 Limited | Arts & recreation | 2025 |
| Basher Watts Racing Syndicates 2 Ltd | Arts & recreation | 2024 |
| Basher Watts Racing Syndicates 3 Ltd | Arts & recreation | 2024 |
| Basher Watts Racing Syndicates 4 Ltd | Arts & recreation | 2025 |
| Basher Watts Racing Syndicates 5 Ltd | Arts & recreation | 2025 |
| Basher Watts Racing Syndicates 8 Ltd | Arts & recreation | 2025 |
| Basher Watts Racing Syndicates Ltd | Arts & recreation | 2024 |
| Bashir Sons U.K Ltd | Wholesale & retail | 2022 |
| Bashur Limited | Real estate | 2021 |
| Basi Dental Limited | Health & social care | 2021 |
| Baslow Air LLP | | 2021 |
| Baslow Holdings Developments Limited | Real estate | 2014 |
| Baslow Parks 1 Ltd | Hospitality | 2024 |
| BASLOW1 Limited | Hospitality | 2017 |
| Basoo Global Ltd | Wholesale & retail | 2026 |
| Bassi Fashions Holdings Limited | Professional & scientific | 2024 |
| Bassi Group (Nottingham) Limited | Professional & scientific | 2011 |
| Bassi Properties Holdings Limited | Professional & scientific | 2024 |
| Bassi Properties Limited | Real estate | 2000 |
| Bassingfield REP Limited | Energy | 2021 |
| Bassingfield Woodyard Limited | Wholesale & retail | 2013 |
| Bassy's Removals (Notts) Ltd | Transport & logistics | 2012 |
| Bastekgrouptransport Ltd | Transport & logistics | 2019 |
| Baster Properties Ltd | Real estate | 2023 |
| Bastille Properties Limited | Real estate | 2013 |
| Basu Consultancy Limited | Health & social care | 2013 |
| Batam Pastry Ltd | Manufacturing | 2021 |
| Batchelors Landscapes Ltd | Administrative & support | 2025 |
| Bateko Ltd | Professional & scientific | 2018 |
| Batfast Cricket Centres Limited | Arts & recreation | 2013 |
| Bath Enterprises Ltd | Hospitality | 2021 |
| Bath Fertility Centre Limited | Health & social care | 2003 |
| Bath Nirvana Ltd | Wholesale & retail | 2023 |
| Bath Street Management Company Limited | Households | 2015 |
| Bath Time Limited | Wholesale & retail | 2001 |
| Bathroom Supreme Limited | Construction | 2017 |
| Bathtime (Heanor) Limited | Wholesale & retail | 2006 |
| Batik Ying Ltd | Wholesale & retail | 2026 |
| Batko Motors Limited | Wholesale & retail | 2019 |
| Batter of Bosworth Limited | Hospitality | 2024 |
| Battlefront Miniatures Europe Limited | Administrative & support | 2006 |
| Bauer Properties Limited | Professional & scientific | 2005 |
| Bauhaus Education Nottingham Limited | Education | 2012 |
| Bauhinia Holding Limited | Hospitality | 2021 |
| Baumers Management Works Ltd | Information & communication | 2020 |
| Bavarian Brews Limited | Hospitality | 2025 |
| Baver Limited | Manufacturing | 1991 |
| BAW (Holdings) Limited | Professional & scientific | 2006 |
| Bawania Ltd | Hospitality | 2025 |
| Baxter Drivig School Ltd | Education | 2024 |
| Baxter Farming Ltd | Agriculture & fishing | 2010 |
| Baxter Freight Limited | Transport & logistics | 2013 |
| Baxter Freight Management Limited | Transport & logistics | 2013 |
| Baxter Gayton Associates Ltd | Real estate | 2017 |
| Baxter Green Management Company Limited | Households | 2019 |
| Baxter Management Services Limited | Professional & scientific | 1993 |
| Baxter Medico-Legal Ltd | Health & social care | 2025 |
| Baxter Motions Picture Limited | Information & communication | 2025 |
| Baxter Power Limited | Construction | 2014 |
| Bay Drinks & Cool Snacks Limited | Administrative & support | 2012 |
| Bay Leaf Catering Ltd | Hospitality | 2026 |
| Bay Tree Design & Build Limited | Construction | 2024 |
| Bay Tree Interiors (Holdings) Limited | Financial services | 2006 |