| Blaze Your Own Trail Ltd | Information & communication | 2025 |
| Blazion Ltd | Manufacturing | 2025 |
| BLC I Carry GP LLP | | 2020 |
| BLC I Carry LP | | 2020 |
| BLC II Carry GP LLP | | 2021 |
| BLC II Carry LP | | 2021 |
| BLC III Carry GP LLP | | 2024 |
| BLC III Carry LP | | 2024 |
| BLD Corporation LP | | 2015 |
| Bleakmill Ltd | Information & communication | 2017 |
| Blebo Investments | Administrative & support | 2023 |
| Blectech Trade LP | | 2017 |
| Blekt LP | | 2013 |
| BLEND360 UK Limited | Professional & scientific | 2021 |
| Blends Lifestyle Limited | Manufacturing | 2021 |
| Blenheim Acquisition L.P. | | 2007 |
| Blenheim Holding L.P. | | 2007 |
| Bleskstar Export LP | | 2017 |
| Blessing Prestige Properties Ltd | Real estate | 2024 |
| Blether Group Limited | Information & communication | 2026 |
| Blether Social Limited | Health & social care | 2025 |
| BLG Tref (GP) Limited | Administrative & support | 2011 |
| BLG Tref Founder Partner II L.P. | | 2013 |
| BLG Tref Founder Partner L.P. | | 2011 |
| Blies Corporation LP | | 2019 |
| Blingblong Group LP | | 2017 |
| Blinkbag Ltd | Administrative & support | 2025 |
| Blipfuture C.I.C. | Wholesale & retail | 2015 |
| Blis Technologies LP | | 2016 |
| Bliscor Alliance LP | | 2015 |
| Bliss Advocate Ltd | Professional & scientific | 2023 |
| Bliss Care Solutions Ltd | Health & social care | 2019 |
| Bliss Charm International LP | | 2016 |
| Bliss House Cafe Ltd | Hospitality | 2025 |
| Bliss Studio (Scotland) Limited | Wholesale & retail | 2013 |
| Bliss Virtue LP | | 2016 |
| Blisscom LP | | 2013 |
| Blissful Corporation LP | | 2016 |
| Blisswear Ltd | Wholesale & retail | 2022 |
| BLK Ulysses LLP | | 2021 |
| Blkfrs PUB Ltd | Hospitality | 2022 |
| Blkwrkstudio Ltd | Administrative & support | 2014 |
| Blnd Ltd | Health & social care | 2023 |
| Bloc Collective Limited | Administrative & support | 2017 |
| Block 9 Architects Ltd | Professional & scientific | 2014 |
| Block 9 Homes LLP | | 2016 |
| Block Estates Limited | Real estate | 2025 |
| Block Star Logic Ltd | Information & communication | 2025 |
| Blockkoin Exchange Ltd | Information & communication | 2017 |
| Blocknetica Limited | Information & communication | 2025 |
| Blockstart Ltd | Administrative & support | 2023 |
| Bloemhot Monya Keng LP | | 2015 |
| Blood Services Ltd. | Health & social care | 2004 |
| Bloodtekuk Limited | Health & social care | 2025 |
| Bloody Scotland Limited | Arts & recreation | 2013 |
| Blookers LP | | 2014 |
| Bloom Box Ltd | Wholesale & retail | 2026 |
| Bloom Corporation L.P. | | 2012 |
| Bloom Fresh Creative LLP | | 2021 |
| Bloom Trade Limited | Wholesale & retail | 2022 |
| Bloomers Holdings Limited | Financial services | 2014 |
| Bloomfield Capital SLP | | 2004 |
| Bloomfield Services LP | | 2016 |
| Bloomiq Limited | Information & communication | 2025 |
| Bloomsbury Historical Consultancy Ltd. | Other services | 2003 |
| Blossom & Co Edinburgh Ltd | Other services | 2025 |
| Blossom and Oscar Consultancy Ltd | Administrative & support | 2025 |
| Blossom Assets LP | | 2017 |
| Blossom Business Development LP | | 2015 |
| Blossom Grace LP | | 2015 |
| Blossomforth Group LP | | 2016 |
| Blossurria Beauty Ltd | Other services | 2023 |
| Bloxham Ventures LP | | 2016 |
| Bloxweaver Ltd | Information & communication | 2024 |
| BLP 2004-25 Limited | Real estate | 2004 |
| BLP 2004-31 Limited | Real estate | 2004 |
| BLP 2004-32 Limited | Real estate | 2004 |
| BLP 2004-33 Limited | Real estate | 2004 |
| BLP 2004-35 Limited | Real estate | 2004 |
| BLP 2004-51 Limited | Real estate | 2004 |
| BLP 2004-52 Limited | Real estate | 2004 |
| BLP 2004-53 Limited | Real estate | 2004 |
| BLP 2004-54 Limited | Real estate | 2004 |
| BLP 2004-55 Limited | Real estate | 2004 |
| BLP 2004-57 Limited | Real estate | 2004 |
| BLP Motors Limited | Wholesale & retail | 2025 |
| BLU AI Limited | Information & communication | 2025 |
| Blucare Limited | Health & social care | 2023 |
| Bludge Wine Limited | Wholesale & retail | 2024 |
| Blue & Red LP | | 2002 |
| Blue Alpha Capital Ltd | Real estate | 2022 |
| Blue Biscay Ltd | Professional & scientific | 2017 |
| Blue Capital Investments Limited | Real estate | 2016 |
| Blue Capricorn Limited | Information & communication | 2013 |
| Blue Checker Limited | Other services | 2012 |
| Blue Conception LP | | 2016 |
| Blue Cube Creative Media Ltd | Administrative & support | 2012 |
| Blue Deal LP | | 2014 |
| Blue Developments Edinburgh Limited | Hospitality | 2019 |
| Blue Dice Software Limited | Information & communication | 2013 |