| Barbados (Radcliffe on Trent) Limited | Hospitality | 2020 |
| Barbecue Express (Nottingham) Ltd | Wholesale & retail | 2024 |
| Barbell and Beers Coaching Limited | Education | 2026 |
| Barbell Coalition Limited | Arts & recreation | 2022 |
| Barbera Surgical Consultancy Ltd | Health & social care | 2026 |
| Barberpod Nottingham Ltd | Other services | 2025 |
| Barbers Republic Ltd | Wholesale & retail | 2022 |
| Barbican Research Associates Limited | Professional & scientific | 2000 |
| Barclay Property Co Limited | Extraterritorial | 2017 |
| Bare Steel Design Ltd | Construction | 2026 |
| Barefoot Baby Limited | Wholesale & retail | 2019 |
| Barely Artificial Ltd | Manufacturing | 2026 |
| Barenco Limited | Manufacturing | 2006 |
| Baresca Tapas Limited | Hospitality | 2018 |
| Bareskin Rituals Limited | Manufacturing | 2025 |
| Barg and Sons Autos Limited | Wholesale & retail | 2021 |
| Bargain Express Global Ltd | Wholesale & retail | 2024 |
| Bargain Hive Ltd | Extraterritorial | 2022 |
| Bargain Spot Ltd | Wholesale & retail | 2021 |
| Bargain Traders Ltd | Wholesale & retail | 2018 |
| Bargains Bay Ltd | Wholesale & retail | 2020 |
| Bargainsure Limited | Real estate | 2006 |
| Bari Streams Ltd | Wholesale & retail | 2025 |
| Barish (2022) Limited | Health & social care | 2022 |
| Baritone Consulting Ltd | Professional & scientific | 2014 |
| Bark & Roll Limited | Wholesale & retail | 2025 |
| Bark IT Solutions Ltd | Information & communication | 2024 |
| Barker & Co Properties Ltd | Real estate | 2025 |
| Barker & Sheldon Limited | Construction | 2006 |
| Barker Gate Holdings Limited | Professional & scientific | 2005 |
| Barker Graftworks Ltd | Information & communication | 2026 |
| Barker Morris Legal Search Limited | Administrative & support | 2020 |
| Barker Studios Entertainment Ltd | Information & communication | 2022 |
| Barkess & Co Limited | Professional & scientific | 2008 |
| Barkestone Associates (Wealth Management) Limited | Financial services | 2009 |
| Barkestone Case Management Ltd | Health & social care | 2016 |
| Barkestone Consulting Limited | Professional & scientific | 2019 |
| Barkestone Farm Limited | Manufacturing | 2023 |
| Barkestone Hub Trading Limited | Hospitality | 2024 |
| Barkestones BBQ Ltd | Hospitality | 2023 |
| Barking Butlers Ltd | Other services | 2025 |
| Barlborough Property One Limited | Real estate | 2019 |
| Barlectrical Ltd | Construction | 2025 |
| Barley Smith & Freeman Ltd | Real estate | 2013 |
| Barlow Bright Steels | Extraterritorial | 1935 |
| Barlows Catering Ltd | Hospitality | 2021 |
| Barlows of Belvoir Ltd | Manufacturing | 2014 |
| Barmageddon Ltd | Hospitality | 2022 |
| Barmouth 2024 Limited | Hospitality | 2024 |
| Barn 5 Property Limited | Real estate | 2023 |
| Barn Farm Butchers Limited | Wholesale & retail | 2001 |
| Barn Garage Limited | Wholesale & retail | 2012 |
| Barnard Fencing Ltd | Construction | 2007 |
| Barnard Projects Limited | Administrative & support | 2018 |
| Barnardine Limited | Information & communication | 2025 |
| Barnes & West Limited | Construction | 2012 |
| Barnes and Haigh Ltd | Education | 2025 |
| Barnes Enterprises Limited | Real estate | 2024 |
| Barnes Family Properties Limited | Real estate | 2022 |
| Barnes Properties Limited | Real estate | 1984 |
| Barnet Town V.E. Limited | Other services | 2019 |
| Barnets Barber Shop Ltd | Other services | 2003 |
| Barnett Confectioners Limited | Manufacturing | 1972 |
| Barney Group 1 Ltd | Real estate | 2024 |
| Barney Group 2 Ltd | Real estate | 2024 |
| Barneyrose Estates Ltd | Real estate | 2024 |
| Barnfield Customs Ltd | Wholesale & retail | 2020 |
| Barnfield Farm Management Company Limited | Households | 2020 |
| Barnstaple V.E. Limited | Other services | 1998 |
| Barolo Bingham Limited | Hospitality | 2019 |
| Barratt, Goff & Tomlinson Limited | Professional & scientific | 2010 |
| Barratts Legal Limited | Financial services | 2021 |
| Barraud & Lund Limited | Manufacturing | 2010 |
| Barrel Drop Ltd | Hospitality | 2017 |
| Barrio Padel HP Ltd | Arts & recreation | 2025 |
| Barrister Link Ltd | Professional & scientific | 2021 |
| Barron Capital Ltd | Financial services | 2021 |
| Barron Residential Properties Limited | Real estate | 2015 |
| Barrowcliffe Cooking Limited | Manufacturing | 2018 |
| Barrowcliffe Food Solutions Limited | Manufacturing | 2014 |
| Barrowcliffe Limited | Manufacturing | 2003 |
| Barrowcliffes Cleaning Facilities Limited | Administrative & support | 2025 |
| Barrowcliffes Property Maintenance Ltd | Administrative & support | 2023 |
| Barry Norman Properties Limited | Real estate | 2018 |
| Barry Pritchard Funeral Services Limited | Extraterritorial | 2013 |
| Barry Shortland Decorators Limited | Construction | 2019 |
| Barry's Chicken Limited | Hospitality | 2019 |
| Bartech Industrial Services Limited | Other services | 2010 |
| Bartender Ltd | Wholesale & retail | 2025 |
| Bartley & Bartley's Limited | Other services | 2016 |
| Bartmew Consultancy Ltd | Water & waste | 2026 |
| Barton Bros. Limited | Arts & recreation | 2018 |
| Barton Electrical Contractors Limited | Real estate | 2001 |
| Barton Grange Construction Limited | Construction | 2006 |
| Barton Lodge Dog Hotel Limited | Hospitality | 2025 |
| Barton Lodge Luxury Pet Hotel Ltd | Hospitality | 2018 |
| Barton Manor (Barton) Management Company Limited | Households | 2014 |
| Barton Precision Property Limited | Manufacturing | 1965 |
| Barton Quarter Management Company Limited | Households | 2020 |
| Barton Transport Limited | Professional & scientific | 2006 |