| Busselton Capital LP | | 2014 |
| Bussiness Service LP | | 2015 |
| Buster Investors & Co | | 1991 |
| Buster L.P. | | 2007 |
| Bustinza Ltd | Information & communication | 2018 |
| Bute Enterprise Finance Fund Ltd | Administrative & support | 2019 |
| Bute Estate Developments Limited | Other services | 2004 |
| Bute Estate Limited | Construction | 1989 |
| Bute Finance | Administrative & support | 2019 |
| Bute Project Sustain Asset Limited | Professional & scientific | 2025 |
| Butler Consultancy Services LP | | 2022 |
| Butler's Chauffeur Drive Limited | Transport & logistics | 2010 |
| Butler's Linen Ltd | Other services | 2013 |
| Butt Group Ltd | Wholesale & retail | 2025 |
| Butt Travel Limited | Arts & recreation | 2021 |
| Butter Investment Trading (Scotland) Partnership SP | | 2022 |
| Buttercrust Limited | Manufacturing | 2024 |
| Butterfly Bay Limited | Wholesale & retail | 2021 |
| Butterfly Global LP | | 2016 |
| Butterfly Management LP | | 2013 |
| Butterfly North Limited | Construction | 2018 |
| Butterfly Scot Ltd | Transport & logistics | 2023 |
| Butterflymedical Ltd | Professional & scientific | 2024 |
| Butterkiss Aesthetics Ltd | Health & social care | 2025 |
| Butterworths Lenses Limited | Manufacturing | 2001 |
| Butteryfx Ltd | Information & communication | 2025 |
| Buxton Capital LP | | 2014 |
| Buy PC Game.Eu LP | | 2012 |
| Buyback Resources Ltd | Professional & scientific | 2024 |
| Buybox Limited | Wholesale & retail | 2020 |
| Buyers Market Property Limited | Information & communication | 2016 |
| Buyers Mart Ltd | Wholesale & retail | 2024 |
| Buymaterials Ltd | Information & communication | 2023 |
| Buyouts C&C 2010A LP | | 2010 |
| Buyouts C&C 2010B LP | | 2010 |
| Buyouts C&C 2010C LP | | 2010 |
| Buyouts C&C 2010D LP | | 2011 |
| Buyouts C&C 2010F LP | | 2010 |
| Buyouts CCC 08-10A LP | | 2007 |
| Buyouts CCC 08-10B LP | | 2007 |
| Buyouts CCC 08-10C LP | | 2007 |
| Buyr Zestora Limited | Wholesale & retail | 2025 |
| Buyrite Bathrooms Limited | Extraterritorial | 1995 |
| Buzz Repairs Ltd | Other services | 2024 |
| Buzzness Agency LP | | 2015 |
| BV Marketing Solutions LP | | 2024 |
| BV Retail Ltd | Wholesale & retail | 2022 |
| BVG Consultancy Ltd. | Information & communication | 2011 |
| BVK PE Europe 2014 LP | | 2013 |
| BVM Property Ltd | Real estate | 2019 |
| BVT Plastering Limited | Construction | 2019 |
| BWE (5) Ltd | Energy | 2013 |
| BWE (7) Ltd | Energy | 2014 |
| Bwm-Ets Ltd | Information & communication | 2018 |
| BWR Contracts Ltd | Construction | 2017 |
| Bxtr 3 Ltd | Hospitality | 2020 |
| Bxtr Holdings Limited | Hospitality | 2020 |
| Bxtr Hostel Limited | Hospitality | 2020 |
| Bxtr Ltd | Hospitality | 2014 |
| Bxtr MCH Ltd | Hospitality | 2020 |
| BY Arena Limited | Hospitality | 2018 |
| BY Forthbridge Capital Ltd | Financial services | 2025 |
| BY Mana Ltd | Hospitality | 2026 |
| BY Pandas Ltd | Information & communication | 2026 |
| BY PB Limited | Financial services | 2023 |
| BY the Blade Ltd | Other services | 2025 |
| Byanima Ltd | Information & communication | 2023 |
| Bybecki Marketing Limited | Professional & scientific | 2026 |
| Bychko LP | | 2019 |
| Bydand Systems Ltd | Professional & scientific | 2026 |
| BYE Investment Management Ltd | Extraterritorial | 2010 |
| BYE Management Limited | Extraterritorial | 2009 |
| Byespritnaturéel LP | | 2024 |
| Byfield Communication LP | | 2014 |
| Byford Trading LP | | 2014 |
| Byres Road Dental Practice Ltd | Health & social care | 2013 |
| Byrne Miller Ltd | Professional & scientific | 2024 |
| Byte Size IT Solutions Ltd | Information & communication | 2021 |
| Bytecrunch Ltd | Information & communication | 2024 |
| Bytegrid Ltd | Information & communication | 2024 |
| Bytequotient UK Ltd | Extraterritorial | 2024 |
| Bytesumpi Ltd | Information & communication | 2017 |
| Byzantian Property Ltd | Real estate | 2018 |
| Byzantium Renaissance LP | | 2018 |
| Byzzy LP | | 2016 |
| BZ Conway Ltd | Transport & logistics | 2022 |
| BZS Ventures Ltd | Wholesale & retail | 2023 |
| C & C Dundee Limited | Health & social care | 2012 |
| C & C Kitchens (Scotland) Ltd | Wholesale & retail | 2008 |
| C & I Agencies Limited | Professional & scientific | 1995 |
| C & J Knight Limited | Hospitality | 1996 |
| C & J Peden Ltd. | Transport & logistics | 1999 |
| C & K Electronics Limited | Wholesale & retail | 2018 |
| C & K Pubs Ltd | Hospitality | 2023 |
| C & L Mezu Property Limited | Real estate | 2026 |
| C & O Engineering Ltd | Manufacturing | 2014 |
| C & Q Optical Limited | Wholesale & retail | 2023 |
| C & U Agro Group LP | | 2016 |
| C & V Carmichael Holdings Limited | Financial services | 2018 |
| C and S Ellis Co Limited | Wholesale & retail | 2019 |