| Babator 2 Limited | London | 2021 |
| Babator 4 Limited | London | 2023 |
| Babb & Green Finance Limited | Okehampton | 2023 |
| Babb BNK Limited | London | 2018 |
| Babb Mortgages Limited | Great Yarmouth | 2018 |
| Babb Remit Ltd | London | 2016 |
| Babbage Bidco Limited | New Milton | 2022 |
| Babbar Europe Ltd | London | 2025 |
| Babcock (UK) Holdings Limited | London | 2007 |
| Babcock Aviation Services (Holdings) Limited | London | 2014 |
| Babcock Defence and Security Investments Limited | London | 2012 |
| Babcock Group (US Investments) Limited | London | 2010 |
| Babcock Holdings Limited | London | 1994 |
| Babcock Information Analytics and Security Holdings Limited | London | 1998 |
| Babcock International Support Services Limited | London | 1997 |
| Babcock Management Limited | London | 1910 |
| Babcock Marine (Devonport) Limited | London | 1994 |
| Babcock Mission Critical Services Topco Ltd | London | 2012 |
| Babcock Mission Critical Services UK Limited | London | 2011 |
| Babcock Overseas Investments Limited | London | 1991 |
| Babcock Project Services Limited | London | 2002 |
| Babcock Services Group Limited | London | 2000 |
| Babcock Southern Holdings Limited | London | 1985 |
| Babcock Support Services (Investments) Limited | London | 2002 |
| Babcock US Investments Limited | London | 2010 |
| Babe Collective Ltd | London | 2026 |
| Babelfish Midco 1 Limited | London | 2023 |
| Babelfish Midco 2 Limited | London | 2023 |
| Babelfish Midco 3 Limited | London | 2023 |
| Baber Holdings Limited | London | 2025 |
| Baber Young Ltd | Cheltenham | 2025 |
| Baberton Book Keeping Services Limited | Edinburgh | 2009 |
| Baberton House Securities Limited | London | 1990 |
| Babeth Taxi Ltd | Wokingham | 2020 |
| Babi (2024) Limited | London | 2024 |
| Babi Holdings Ltd | London | 2023 |
| Baboohan (Nominee) Limited | Weybridge | 2015 |
| Babra Financials Ltd | Leicester | 2019 |
| Babsco Limited | Loughborough | 2014 |
| Babson Limited | Cardiff | 2017 |
| Babtalk Investments Limited | Chelmsford | 2019 |
| Babtooma Holdings Ltd | Leeds | 2024 |
| Babu.K Limited | Dorset | 2020 |
| Babul Miah Ltd | Nottingham | 2025 |
| Baby and Child Pension Trustee Limited | Newcastle Upon Tyne | 2023 |
| Baby Blythe Investments | Ormskirk | 2025 |
| Baby Network Holdings Limited | Liverpool | 2022 |
| Baby Rosa Holdings (UK) Limited | London | 2017 |
| Baby Terzo Limited | London | 2020 |
| Babyballet Limited | Halifax | 2012 |
| Babyland Holdings Limited | Leicester | 2021 |
| Babylon Bidco Limited | London | 2023 |
| Babylon Enterprises Limited | Warwick | 2011 |
| Babylon Finco Limited | London | 2023 |
| Babylon Midco 1 Limited | London | 2023 |
| Babylon Midco 2 Limited | London | 2023 |
| Babylon Mortgages Ltd | Wigston | 2015 |
| Babylon Topco Limited | London | 2023 |
| Babylon-Blue Limited | London | 2021 |
| BAC Finance Ltd | London | 2018 |
| BAC Group Holdings Limited | Runcorn | 2025 |
| Baca Ltd | Chislehurst | 2016 |
| Baca Ventures Ltd | Selby | 2026 |
| Bacani Norman Investments Ltd | Consett | 2025 |
| Bacanora Lithium Limited | London | 2018 |
| Bacar Group Limited | Holywood | 2013 |
| Bacard Renewable Investments Limited | Carlisle | 2022 |
| Bacarel & Co Group Holdings Limited | Loughton | 2018 |
| Bacb Investments Limited | Finchley | 2023 |
| Bacchus Capital Special Sits V1 Limited | London | 2019 |
| Bacchus Capital Special Sits V2 Limited | London | 2019 |
| Bacchus Capital Tactical Situations 2 Limited | London | 2022 |
| Bacchus Capital Tactical Situations 3 Limited | London | 2026 |
| Bacchus Capital Tactical Situations Limited | London | 2019 |
| Bacchus Holdings Limited | London | 2015 |
| Bacchus Investors Limited | Rainham | 2021 |
| Bacchus Jvco Limited | London | 2023 |
| Bacchus Strategic Minerals Limited | London | 2026 |
| Bacchus Wine Group Co., Ltd. | London | 2017 |
| Bace Group Ltd | London | 2020 |
| Bachar Investments Limited | London | 2023 |
| Bachelor Holdings Limited | Alresford | 2024 |
| Bachy Soletanche Holdings (Europe) Limited | Burscough | 2003 |
| Baciuska Solutions Ltd | London | 2026 |
| Back 9 Holdings Ltd | Northampton | 2021 |
| Back Holdings Limited | Swaffham | 2024 |
| Back of the Shop Ltd | London | 2022 |
| Back Office Software Systems Holding Ltd | London | 2022 |
| Back Office Support Services Limited | Congleton | 1998 |
| Back Office Trust and Wills Limited | Portsmouth | 2025 |
| Back Office Ventures Limited | Welwyn Garden City | 2026 |
| Back Real Estate Limited | Swaffham | 2024 |
| Back to the Futures Limited | London | 2013 |
| Back to the Futures Trading Ltd | Chigwell | 2009 |
| Back-On-Track Holdings Limited | Cardiff | 2020 |
| Back-Up North Investments Limited | Huddersfield | 2022 |
| Back-Up Yorkshire Limited | Bradford | 2022 |
| Backbone Property Group Limited | Warwick | 2020 |
| Backed by Frank Limited | Cowbridge | 2026 |
| Backed by Science Ventures Ltd | London | 2024 |