| Blow Design Limited | Information & communication | 2006 |
| Blow ME Hairdressing Limited | Other services | 2021 |
| Blox-Org Ltd | Other services | 2025 |
| Bloxham, Miller, Birrell Limited | | 1973 |
| Bloxx Creative Ltd | Professional & scientific | 2020 |
| Bloys Brothers Properties Ltd | Real estate | 2018 |
| BLP Capital Ltd | Real estate | 2026 |
| Bltb Developments Limited | Construction | 2020 |
| BLU Inc. Graphics Ltd. | Professional & scientific | 2000 |
| BLU Limited | Professional & scientific | 1999 |
| BLU Shift Creative Ltd | Arts & recreation | 2024 |
| BLU Wireless Technology (EBT) Limited | Financial services | 2017 |
| BLU Wireless Technology Limited | Manufacturing | 2009 |
| Blu-Fire Smoke'N'Grill Ltd | Hospitality | 2013 |
| Blucher Orthopaedics Ltd | Health & social care | 2026 |
| Bludbrothers Ltd | Information & communication | 2023 |
| Blue & Berry Consulting Limited | Professional & scientific | 2019 |
| Blue & White Quarters Limited | Information & communication | 2019 |
| Blue Actuarial Limited | Professional & scientific | 2014 |
| Blue Anchor Analytics Limited | Financial services | 2026 |
| Blue Ascent Psychology Ltd | Professional & scientific | 2025 |
| Blue Aubergine Ltd. | Hospitality | 2024 |
| Blue Aura Ltd | Administrative & support | 2026 |
| Blue Balloon Flights Ltd | Administrative & support | 2026 |
| Blue Bench Productions Ltd | Information & communication | 2022 |
| Blue Boston Limited | Other services | 2023 |
| Blue Bridge Commercial Management Limited | Extraterritorial | 2015 |
| Blue Building and Design Limited | Construction | 2020 |
| Blue Circles Group Limited | Administrative & support | 2017 |
| Blue Cliff Consulting Limited | Information & communication | 2007 |
| Blue Cold Ltd | Construction | 2026 |
| Blue Comma Technologies Limited | Information & communication | 2025 |
| Blue Cube Resource Solutions Ltd | Administrative & support | 2018 |
| Blue Door Property Ltd | Real estate | 2016 |
| Blue DOT Construction Limited | Construction | 2006 |
| Blue DOT Consultants Limited | Administrative & support | 2014 |
| Blue DOT Psychology Limited | Health & social care | 2025 |
| Blue Ember Mobile Solutions Ltd | Information & communication | 2024 |
| Blue Financial Group Limited | Administrative & support | 2011 |
| Blue Fish Bar Bristol Ltd | Hospitality | 2018 |
| Blue Flame Pictures Ltd | Information & communication | 2015 |
| Blue Flame Services (South West) Limited | Construction | 2011 |
| Blue Foot Galapagos Limited | Administrative & support | 2025 |
| Blue Fountain Care Limited | Health & social care | 2022 |
| Blue Fountain Property Management Limited | Households | 2024 |
| Blue Fruit International Limited | Wholesale & retail | 2007 |
| Blue Futures Studio Limited | Professional & scientific | 2023 |
| Blue Garage Ltd | Other services | 2024 |
| Blue Gecko (UK) Ltd | Manufacturing | 2008 |
| Blue Giraffe Vision Limited | Professional & scientific | 2017 |
| Blue Hawk Roofing Ltd | Construction | 2026 |
| Blue Holdings Limited | Hospitality | 2015 |
| Blue Horizon Digital Solutions Ltd | Information & communication | 2006 |
| Blue Horse Bristol Ltd | Construction | 2025 |
| Blue House Veterinary Centre Limited | Extraterritorial | 2010 |
| Blue Hudson Capital Limited | Construction | 2026 |
| Blue Lagoon Insights Ltd | Professional & scientific | 2022 |
| Blue Lake Property Investment Limited | Real estate | 2020 |
| Blue Lambda Limited | Information & communication | 2017 |
| Blue Lion Courier Services Ltd | Transport & logistics | 2025 |
| Blue Lobster Marketing Ltd | Administrative & support | 2014 |
| Blue Machinery (Southern) Limited | Wholesale & retail | 2003 |
| Blue Marlin Dive UK Ltd | Wholesale & retail | 2020 |
| Blue Matte Ltd | Wholesale & retail | 2024 |
| Blue Matter South-West CIC | Administrative & support | 2020 |
| Blue Melons Limited | Administrative & support | 2006 |
| Blue Metaphor Ltd | Information & communication | 2022 |
| Blue Mind Counselling Group Ltd | Other services | 2026 |
| Blue Near Holdings Ltd | Professional & scientific | 2025 |
| Blue Near Ltd | Administrative & support | 2025 |
| Blue Nest Real Estate Limited | Real estate | 2016 |
| Blue Orca Plumbing and Heating Limited | Construction | 2021 |
| Blue OWL Capital UK Limited | Administrative & support | 2020 |
| Blue Oyster Limited | Professional & scientific | 2012 |
| Blue Pencil Games Limited | Administrative & support | 2022 |
| Blue Penguin Accountancy Limited | Professional & scientific | 2013 |
| Blue Phoenix Investments Limited | Information & communication | 2022 |
| Blue Phoenix Solutions Limited | Administrative & support | 2010 |
| Blue Platinum Group Ltd | Construction | 2015 |
| Blue Raven Business Solutions Ltd | Administrative & support | 2023 |
| Blue Rock Pools Limited | Construction | 2002 |
| Blue Roll Press Community Interest Company | Manufacturing | 2024 |
| Blue Sail Limited | Professional & scientific | 2023 |
| Blue Seventy Europe Limited | Wholesale & retail | 2004 |
| Blue Skies Business Consultants Limited | Professional & scientific | 2014 |
| Blue Sky Accounts Limited | Professional & scientific | 2017 |
| Blue Sky Builders Bristol Limited | Construction | 2015 |
| Blue Sky Compliance Ltd | Administrative & support | 2025 |
| Blue Sky Local Ltd | Wholesale & retail | 2024 |
| Blue Sky Property Solutions Limited | Real estate | 2009 |
| Blue Sky Roofing Bristol Ltd | Construction | 2025 |
| Blue Sky Sports Physiotherapy Ltd | Education | 2025 |
| Blue Sparrow Apps Limited | Information & communication | 2008 |
| Blue Square Red Square Ltd | Information & communication | 2014 |
| Blue Star (Turkiye) Ltd | Other services | 2017 |
| Blue Stone Renewable I Ltd | Energy | 2020 |
| Blue Street Consulting Limited | Professional & scientific | 2023 |
| Blue Street Properties Limited | Real estate | 2022 |
| Blue Structures Limited | Professional & scientific | 2017 |
| Blue Sun Construction Ltd | Construction | 2022 |