| Aymestrey Lodges Ltd | Hospitality | 2021 |
| Ayub Accountants Ltd | Professional & scientific | 2020 |
| Ayub Investment Properties Ltd | Real estate | 2024 |
| AZ Express Courier Cargo Ltd | Transport & logistics | 2023 |
| Azul Limited | Professional & scientific | 2022 |
| Azuristech Ltd | Information & communication | 2016 |
| B & B Funeral Directors Limited | Extraterritorial | 2002 |
| B & J Dubb Limited | Real estate | 2021 |
| B a Cashmore Group Ltd | Professional & scientific | 2017 |
| B a Cashmore Limited | Real estate | 1950 |
| B and B Property Limited | Real estate | 2022 |
| B Estates Ltd | Real estate | 2026 |
| B Greek Ltd | Hospitality | 2025 |
| B J B Farming Limited | Agriculture & fishing | 1998 |
| B K Sheet Metal Limited | Manufacturing | 2010 |
| B M Hagan Limited | Construction | 2002 |
| B S Store 1 Limited | Hospitality | 2021 |
| B&G Inclusions Limited | Public administration | 2025 |
| B&R Consultancy (Midlands) Limited | Professional & scientific | 2013 |
| B&R Investment Group Limited | Real estate | 2025 |
| B-Hem Solutions Ltd | Professional & scientific | 2026 |
| B-Spoke Caring Ltd | Professional & scientific | 2008 |
| B-Spoke Properties Ltd | Real estate | 2015 |
| B. Bernard & Sons Limited | Extraterritorial | 1983 |
| B.R. UK Distribution Limited | Wholesale & retail | 2025 |
| B.R.I.A.A.N.S. Jane Foundation | Health & social care | 2019 |
| B.S. Nahal Locums Ltd | Health & social care | 2022 |
| B.S.B. Pharmacy Limited | Wholesale & retail | 1985 |
| B.T.Felton & Sons Limited | Construction | 1943 |
| B1 Property Services Limited | Construction | 2023 |
| B26 Alarms Limited | Construction | 2020 |
| B2B Quote Limited | Information & communication | 2006 |
| B72 Property Ltd | Real estate | 2020 |
| B74 Construction and Groundworks Ltd | Construction | 2025 |
| B74 Limited | Construction | 1996 |
| B75 Barbers Ltd | Other services | 2022 |
| B98 Long Ltd | Construction | 2016 |
| Baab Limited | Wholesale & retail | 2016 |
| BAC Flooring Limited | Construction | 2009 |
| Baccara Lubricants Limited | Wholesale & retail | 2003 |
| Bachhal Limited | Wholesale & retail | 2024 |
| BAD BOY Bars Limited | Wholesale & retail | 2023 |
| BAD BOY Cider LLP | | 2017 |
| Badger Insulation Limited | Construction | 1986 |
| Badges Property Ltd | Real estate | 2026 |
| Badham Farm Limited | Hospitality | 2004 |
| Badham Farm Management Ltd | Hospitality | 2020 |
| Badleigh Consultancy Limited | Health & social care | 2014 |
| Badr Residential Ltd | Health & social care | 2025 |
| Baguley Bros.,Limited | Extraterritorial | 1935 |
| Bains Plant Hire Ltd | Financial services | 2022 |
| Bainze Group Ltd | Construction | 2026 |
| Baites Limited | Real estate | 2023 |
| Baitong Global Supply Limited | Wholesale & retail | 2022 |
| Bakerpull Ltd | Transport & logistics | 2019 |
| Bakers Lane Fish Bar Limited | Hospitality | 2024 |
| Bakery Brothers Ltd | Manufacturing | 2022 |
| BAL Q Singh Ltd | Professional & scientific | 2025 |
| Balance and Motion Limited | Health & social care | 2020 |
| Balinese Tea & Coffee Ltd | Wholesale & retail | 2025 |
| Balla Barbers Legacy Limited | Other services | 2020 |
| Baller Properties Limited | Real estate | 2019 |
| Balli Property Limited | Real estate | 2021 |
| Ballina Limited | Administrative & support | 2024 |
| Ballinger & Errington Ltd | Real estate | 2021 |
| Ballymoss Parade Properties Ltd | Real estate | 2019 |
| Balraj Dhami Expert Witness Ltd | Professional & scientific | 2021 |
| Balti Lodge (UK) Ltd | Hospitality | 2023 |
| Bang on Construction and Maintenance Ltd | Construction | 2024 |
| Bang on Interiors Ltd | Construction | 2025 |
| Banks Funeral Service Limited | Extraterritorial | 1973 |
| Banneroak Limited | | 1987 |
| Bansal & Mccarthy Ltd | Real estate | 2025 |
| Banwin Properties Limited | Real estate | 1995 |
| Banyan Venture Ltd | Real estate | 2025 |
| Bar & Grill 1977 Ltd | Hospitality | 2020 |
| Bara Consulting Services Limited | Professional & scientific | 2017 |
| Barber Cutz Ltd | Other services | 2025 |
| Barber Hills Ltd | Other services | 2017 |
| Barbershop Social Ltd | Other services | 2022 |
| Barford Catering Ltd | Hospitality | 2024 |
| Bargain Footwear Ltd | Wholesale & retail | 2013 |
| Bargaincheckout Limited | Wholesale & retail | 2020 |
| Barhouse Limited | Hospitality | 2024 |
| Barinbearer Ltd | Administrative & support | 2020 |
| Bark Doggy Daycare Ltd | Agriculture & fishing | 2017 |
| Barker Family Investments Ltd | Real estate | 2016 |
| Barley Land Development Ltd | Real estate | 2024 |
| Barnard Law Properties Limited | Real estate | 2018 |
| Barnridge Limited | Real estate | 2019 |
| Barnt Green Properties Limited | Construction | 2002 |
| Barons Court Trade Ltd | Wholesale & retail | 2022 |
| Barratt and Powell Limited | Wholesale & retail | 2026 |
| Barrier Safe Limited | Construction | 2025 |
| Barrister Direct Services Limited | Professional & scientific | 2022 |
| Bartestree Fish & Chips Ltd | Hospitality | 2022 |
| Bartok Limited | Professional & scientific | 1994 |
| Barton Rigging Services Limited | Information & communication | 2012 |
| Barwell Capitol Limited | Construction | 2020 |
| Barwell East Limited | Construction | 2020 |