| Baai International Limited | Administrative & support | 2024 |
| Baajio Ltd | Information & communication | 2018 |
| Baan HAO Ltd | Hospitality | 2025 |
| Baan Sakunee Churchill Way Ltd | Health & social care | 2019 |
| Baani Apparels Ltd | Manufacturing | 2025 |
| Baba Cardiff Limited | Hospitality | 2025 |
| Babaganoosh Ltd | Administrative & support | 2016 |
| Babainvest Ltd | Real estate | 2024 |
| Babar Mode Ltd | Wholesale & retail | 2026 |
| Babarbrothers Ltd | Wholesale & retail | 2026 |
| Babayaga Limitless Ltd | Wholesale & retail | 2026 |
| Babbex Limited | Professional & scientific | 2019 |
| Babble and Froth Ltd | Information & communication | 2018 |
| Babcure Ltd | Manufacturing | 2021 |
| Babe Lashes Ltd | Other services | 2025 |
| Babes (Cardiff) Limited | Hospitality | 1996 |
| Babil Property Group Ltd | Real estate | 2025 |
| Baboomoo Limited | Wholesale & retail | 2023 |
| Babson Limited | Financial services | 2017 |
| Baby Barrister Recruitment Limited | Administrative & support | 2009 |
| Baby's Marvel Ltd | Other services | 2024 |
| Babybini Ltd | Wholesale & retail | 2025 |
| Babyccino Ltd | Hospitality | 2025 |
| Babydewyou Limited | Other services | 2023 |
| Babylon Barbers Limited | Other services | 2019 |
| Babylon Construction Ltd | Construction | 2020 |
| Babylon Doner Ltd | Manufacturing | 2019 |
| Babylon UK Services Ltd | Administrative & support | 2018 |
| Babylonia Tobacco Ltd | Wholesale & retail | 2017 |
| Bacareto Ltd | Hospitality | 2021 |
| Bacchus Cardiff Limited | Hospitality | 2025 |
| Bacchus Life Limited | Health & social care | 2019 |
| Bacha Rahman Ltd | Wholesale & retail | 2024 |
| Bachata Movement Ltd | Arts & recreation | 2024 |
| Bachuk Ltd | Professional & scientific | 2025 |
| Back 2 LAB Limited | Wholesale & retail | 2024 |
| Back-On-Track Holdings Limited | Financial services | 2020 |
| Back-On-Track Mountain Bike Solutions Limited | Arts & recreation | 2008 |
| BACK2BACK Chiropractic Clinic Ltd | Health & social care | 2012 |
| Backcore Solutions Ltd | Administrative & support | 2025 |
| Backoffice HR Services Ltd | Administrative & support | 2022 |
| Backstreet Barbershop Ltd | Other services | 2024 |
| Backwell Judo Club Ltd | Education | 2021 |
| Backyard Bikes Ltd | Wholesale & retail | 2025 |
| Bacme Ltd | Health & social care | 2018 |
| Bacovia Limited | Hospitality | 2009 |
| BAD Apple Hair Concessions Limited | Other services | 2017 |
| BAD Apple Hair Lichfield Limited | Other services | 2017 |
| BAD Apple Hair Solihull Ltd | Other services | 2014 |
| BAD Apple Hair Stafford Limited | Other services | 2018 |
| BAD Apple Hair Wolverhampton Ltd | Other services | 2015 |
| BAD Boys London Ltd | Other services | 2025 |
| BAD Wolf (Alex) Ltd | Information & communication | 2025 |
| BAD Wolf (DG) Ltd | Information & communication | 2023 |
| BAD Wolf (HDM) Ltd | Information & communication | 2017 |
| BAD Wolf (HDM3) Limited | Information & communication | 2020 |
| BAD Wolf (IHS) Ltd | Information & communication | 2018 |
| BAD Wolf (IND3) Ltd | Information & communication | 2022 |
| BAD Wolf (IND4) Ltd | Information & communication | 2024 |
| BAD Wolf (IND5) Ltd | Information & communication | 2026 |
| BAD Wolf (Red) Ltd | Information & communication | 2022 |
| BAD Wolf (RED2) Ltd | Information & communication | 2024 |
| BAD Wolf (TLD) Ltd | Information & communication | 2025 |
| BAD Wolf (Tobs) Ltd | Information & communication | 2025 |
| BAD Wolf (Tobsx) Ltd | Information & communication | 2026 |
| BAD Wolf (TWB) Ltd | Information & communication | 2022 |
| BAD Wolf (TWK) Ltd | Information & communication | 2022 |
| BAD Wolf Ltd | Information & communication | 2015 |
| BAD Wolf Studios Wales Ltd | Information & communication | 2016 |
| Badass Mother Runners Ltd | Wholesale & retail | 2018 |
| Badavi's (Exeter) Ltd | Other services | 2018 |
| Badb Ltd | Professional & scientific | 2020 |
| Baddox Trade Ltd | Wholesale & retail | 2024 |
| Badeax Ltd | Wholesale & retail | 2025 |
| Bademkiran Legal Consultancy Ltd | Professional & scientific | 2020 |
| Baden Capital Limited | Real estate | 2022 |
| Badger Brand Assemblies Ltd | Manufacturing | 2020 |
| Badger's Halt Ltd | Agriculture & fishing | 2025 |
| Badgetbay Ltd | Wholesale & retail | 2025 |
| Badner Inns Ltd | Hospitality | 2016 |
| Badra Ltd | Health & social care | 2023 |
| Baduhenna Bidco Limited | Financial services | 2021 |
| Baduhenna Holdco Limited | Financial services | 2021 |
| Baebüsh Limited | Wholesale & retail | 2018 |
| Baflet Group PLC | Wholesale & retail | 2022 |
| Bafy Trade Ltd | Wholesale & retail | 2024 |
| Bagac Ltd | Wholesale & retail | 2024 |
| Baggl UK Limited | Administrative & support | 2019 |
| Bagnall Consultancy Limited | Information & communication | 2016 |
| Bagp Holdings Ltd | Financial services | 2023 |
| Bags & Beyond Ltd | Wholesale & retail | 2025 |
| Bags of Goodness Ltd | Wholesale & retail | 2008 |
| BAH Properties Group Ltd | Real estate | 2016 |
| BAH Property Solutions Ltd | Construction | 2019 |
| Bahaar Kitchen UK Limited | Manufacturing | 2020 |
| Bahaaran Ltd | Wholesale & retail | 2025 |
| Bahad Ltd | Transport & logistics | 2019 |
| Bahadir Store Ltd | Wholesale & retail | 2023 |
| Bahara Limited | Information & communication | 2025 |
| Bahenz Ltd | Wholesale & retail | 2025 |