| Bloomfold Developments Limited | Chelmsford | 2004 |
| Bloomin Forests Ltd | Liverpool | 2025 |
| Blooming Paper Ltd | Hackney | 2019 |
| Blooming Parenting Limited | Romford | 2016 |
| Blooming Storage London Ltd | London | 2025 |
| Blooming Trading Group Ltd | Beckenham | 2020 |
| Bloomm Limited | London | 2024 |
| Bloomplot Limited | Watford | 2025 |
| Blooms by Birth Limited | Worthing | 2024 |
| Blooms of Elegance Limited | Wigan | 2024 |
| Bloomsbury Circle Ltd. | Oxford | 2016 |
| Bloomsbury Innovation Group Community Interest Company | Uckfield | 2016 |
| Bloomsbury Outsourcing Limited | Woodford Green | 2012 |
| Bloomsdale Consultants Ltd | London | 2021 |
| Blooners 2000 Limited | Reading | 2000 |
| Blooniverse Cybernetics Ltd | | 2007 |
| Bloor's Private Hire Limited | Swadlincote | 2003 |
| Blossier Company Limited | London | 2016 |
| Blossom and Gold Ltd | Norwich | 2019 |
| Blossom Bridal & Occasion Wear Limited | | 2007 |
| Blossom Bridge Children's Services Ltd | Wantage | 2026 |
| Blossom DEW Ltd | London | 2025 |
| Blossom Flooring Co., Ltd | Cambridge | 2018 |
| Blossom Global Ltd | Cardiff | 2018 |
| Blossom Hill Ltd | Poole | 2022 |
| Blossom Knitting Co., Ltd | London | 2015 |
| Blossom Yoga Limited | Leicester | 2011 |
| Blossomco Limited | Loughborough | 2013 |
| Blossomfield Road Management Co. Limited | Stourbridge | 2019 |
| Blosville Limited | Eastleigh | 2022 |
| Blousey Brown Limited | Glastonbury | 2010 |
| Blousey Browne Limited | Lutterworth | 2011 |
| Blower's Kitchen Limited | Long Bennington | 2017 |
| Blowers Green Timber Co. Limited | Gainsborough | 1968 |
| Blowers Jewellers Holdings Limited | Hull | 2013 |
| Blown Away IW Ltd | Cowes | 2013 |
| Blox (UK) Ltd | Chester | 2014 |
| Bloxhall RD Limited | Ilford | 2020 |
| Bloxworth Capital Partners Limited | Wareham | 1999 |
| BLP Central Limited | Ashby-De-La-Zouch | 1998 |
| Blri Properties Ltd | Halstead | 2022 |
| BLT Transport Ltd | South Shields | 2022 |
| BLU Capital Limited | London | 2015 |
| BLU Energy Group Limited | Croydon | 2023 |
| BLU ENZ Ltd | Manchester | 2023 |
| BLU Group Ltd | Eastleigh | 2016 |
| BLU Swim Ltd | Christchurch | 2012 |
| Blubolt Security Limited | Stoke-On-Trent | 2024 |
| Bluco Limited | Bearley, Stratford-Upon-Avon | 1981 |
| Blucon Community Foundation C.I.C. | Solihull | 2014 |
| Blue & White Limited | Bradford | 1985 |
| Blue Abacus Homes Ltd | Newport | 2022 |
| Blue Agenda Ltd | Thornton-Cleveleys | 2022 |
| Blue Ambuda Limited | London | 2015 |
| Blue Anchor Lane Limited | Beckenham | 2013 |
| Blue and Co. EOT Limited | Worcester | 2022 |
| Blue Apple Associates Limited | Gloucester, | 2015 |
| Blue ASS FLY Limited | Waltham Abbey | 2015 |
| Blue Badge Access Awards Limited | Bath | 2018 |
| Blue Badge Solutions Ltd | London | 2024 |
| Blue Bamboo Consulting Limited | London | 2022 |
| Blue Banana Limited | London | 2010 |
| Blue Bear Surrey Limited | Crawley | 2025 |
| Blue BEE Coffee Ltd | Corsham | 2024 |
| Blue Bird Invest PLC | Dover | 2010 |
| Blue Black and Two Shades of Grey Limited | London | 2010 |
| Blue Blossom Ltd | London | 2021 |
| Blue Box (UK) Limited | Leeds | 2001 |
| Blue Box Accounting Limited | Gainsborough | 2009 |
| Blue Box Self Storage Ltd | Great Yarmouth | 2017 |
| Blue Brick Management Limited | Prestwich | 2011 |
| Blue Bridge Commercial Management Limited | Bristol | 2015 |
| Blue Bubble Creative Studios Ltd | Newcastle Under Lyme | 2025 |
| Blue Buddleia Ltd | Harlow | 2025 |
| Blue Build Records Ltd | Hazelmere | 2022 |
| Blue Bunny Productions Limited | London | 2010 |
| Blue Cauldron Ltd | Eastbourne | 2003 |
| Blue Chilli Leasing Limited | Cheadle | 2012 |
| Blue Chip Funding Limited | Watford | 2001 |
| Blue Chip Limited | Bedford | 2009 |
| Blue Circle Investments Limited | Birmingham | 1885 |
| Blue Circle Properties Limited | Birmingham | 1983 |
| Blue Circle Residential Estates Limited | Birmingham | 1993 |
| Blue Circle Share Shop Limited | Birmingham | 1962 |
| Blue COD Consultants Limited | Wetherby | 2007 |
| Blue Collar Worker Limited | London | 2012 |
| Blue Corallix Ltd | London | 2025 |
| Blue Corner Sweden Limited | London | 2023 |
| Blue Court Dental Centre Limited | Edgware | 2010 |
| Blue Crab Company Worldwide Ltd | Eastbourne | 2020 |
| Blue Dawn Publications Limited | Leigh | 2021 |
| Blue Deansgate Limited | London | 2015 |
| Blue Diamond Cargo Limited | St. Leonards-On-Sea | 2023 |
| Blue DOT Child Law Limited | Basingstoke | 2019 |
| Blue Drake Limited | Eastleigh | 2014 |
| Blue Dynamic Limited | London | 2013 |
| Blue Eagle Holding Ltd | London | 2021 |
| Blue Edge Property Limited | London | 2013 |
| Blue Elephant Co., Ltd | London | 2016 |
| Blue Elephant Limited | South Godstone | 2021 |