| Blue Systems Limited | London | 2024 |
| Blue Test Limited | Bradford | 2021 |
| Blue Ticking Ltd | Rudgwick | 2020 |
| Blue Tide Holdings Ltd | Stratford-Upon-Avon | 2017 |
| Blue Tiger Limited | Shifnal | 2022 |
| Blue Tomato Limited | Uffcott | 2023 |
| Blue Toon Laundrette Ltd | Peterhead | 2025 |
| Blue Trevally Ltd | London | 2024 |
| Blue Triangle Solutions Ltd | Chigwell | 2015 |
| Blue Valeting Ltd | Hounslow | 2019 |
| Blue Van Builders Limited | Newbury | 2023 |
| Blue Vega Consulting Ltd | Mildenhall | 2020 |
| Blue Velvet Aesthetics Ltd | Crediton | 2026 |
| Blue Ventures Services Limited | London | 2019 |
| Blue Vines Digital Marketing Limited | London | 2019 |
| Blue Water Capital (London) Limited | London | 2020 |
| Blue Water NW Ltd | St. Asaph | 2020 |
| Blue Water Valeting Ltd | London | 2025 |
| Blue Web Limited | London | 2025 |
| Blue Whale Alba Ltd | Glasgow | 2024 |
| Blue Whale Horizons Ltd. | Chudleigh | 2024 |
| Blue Wide Limited | London | 2025 |
| Blue Willow Coaching Limited | Stroud | 2015 |
| Blue Windmill Childcare Limited | Market Harborough | 2001 |
| Blue Wings Retail Ltd | London | 2020 |
| Blue Wise Limited | London | 2025 |
| Blue Wolf Enterprises Limited | London | 2025 |
| Blue World Counselling & Coaching Ltd | Aylesbury | 2023 |
| Blue Yard Limited | Manchester | 2003 |
| Blue ZOO Consulting & Coaching Ltd | Kingston Upon Thames | 2012 |
| Blue-Collar Barbering Morley Ltd | Leeds | 2026 |
| Blue@Uk Ltd | Manchester | 2022 |
| Bluebay Laundry Limited | Llangollen | 2023 |
| Bluebeard's Barber Shop Limited | Harrogate | 2012 |
| Bluebell Barn Ltd | Chepstow | 2011 |
| Bluebell Cemetery & Crematorium Ltd | Halstead | 2024 |
| Bluebell Cemetery Property Limited | Sevenoaks | 2013 |
| Bluebell Lane Ltd | St Austell | 2016 |
| Bluebell Laundry & Linen Hire Ltd | Fakenham | 2025 |
| Bluebell Nails Ltd | Stirling | 2026 |
| Bluebell Pet Cemetery Limited | Hastings | 2018 |
| Bluebell Restorations Ltd | Boston | 2023 |
| Bluebell Upholstery Limited | Leyland | 2020 |
| Bluebell Wood Pet Crematorium Limited | Swansea | 2023 |
| BLUEBELL7 Ltd | Crawley | 2016 |
| Bluebells Aesthetics (UK) Limited | Birmingham | 2019 |
| Bluebells Community Club | Salford | 2021 |
| Blueberry Associates Ltd | London | 2017 |
| Blueberry Capital Limited | Bideford | 2019 |
| Blueberry Consultancy Network Limited | London | 2015 |
| Blueberry Consulting & Solutions Design Ltd | Bury St. Edmunds | 2013 |
| Blueberry Key Ltd | Bognor Regis | 2020 |
| Blueberry Moon Limited | Aberdeen | 2011 |
| Blueberry Network Technology Limited | London | 2019 |
| Bluebird Care Associates Limited | London | 2018 |
| Bluebird Family Holdings | Hassocks | 2019 |
| Blueboard Training and Consultancy Ltd | Caterham | 2019 |
| Blueboat Training Services Ltd | Ilkley | 2020 |
| Bluebond Investments Limited | Ellesmere Port | 1999 |
| Blueborough Limited | London | 2025 |
| Bluebourne Limited | London | 2024 |
| Bluebourne Trading Limited | Portsmouth | 2021 |
| Bluebrok Limited | Manchester | 2010 |
| Bluebrook Management Limited | Rochester | 2014 |
| Bluechase 1 Limited | Kingston Upon Thames | 2018 |
| Bluechip Enterprise Inc. Limited | Harrow | 2015 |
| Bluecoast Limited | Nottingham | 2018 |
| Bluecore Systems Ltd Ltd | Oldham | 2026 |
| Bluecrest Advisory Services Ltd | London | 2025 |
| Bluecut Limited | London | 2021 |
| Bluedog Finance Limited | Waterlooville | 2022 |
| Bluedots Computing and Interpreting Solutions Limited | | 2005 |
| Bluefair Limited | Daventry | 2012 |
| Bluefame Limited | London | 1988 |
| Bluefare Corporation Limited | London | 2025 |
| Bluefield Properties Limited | London | 2012 |
| Bluefinch Consulting Limited | London | 2015 |
| Bluefreds Limited | Neath | 2017 |
| Bluegrace Environment Ltd | London | 2022 |
| Bluegrace Food & Beverage Ltd | London | 2022 |
| Bluegrace Health Ltd | London | 2022 |
| Bluegrace Hotels & Resorts Ltd | London | 2022 |
| Bluegreen Management Services Ltd | London | 2011 |
| Bluehaze Cattery & Small Animal Hotel Limited | Ringwood | 2025 |
| Bluehouse Consulting Limited | St. Leonards-On-Sea | 2014 |
| Bluehouse Music Consultancy Ltd | Newport Pagnell | 2012 |
| Bluei.O.N. Limited | Northampton | 2014 |
| Blueinc Support Services Limited | Essex | 2019 |
| Bluej Leisure Ltd | Sutton In Ashfield | 2024 |
| Bluekey Impex Ltd | London | 2014 |
| Bluelake Energy Consultancy Limited | Watford | 2025 |
| Bluelemon Qhse Ltd | Manchester | 2019 |
| Blueline Solutions Ltd | Witney | 2012 |
| Bluelinelashes Ltd | Witham | 2024 |
| Bluelove Ltd | London | 2025 |
| Bluemarch Systems Ltd | London | 2026 |
| Bluemob Ltd | London | 2020 |
| Bluemoon Event Services Ltd | Shoreham-By-Sea | 2020 |
| Bluemoon Massages Ltd | Portsmouth | 2024 |
| Bluenach Ltd | London | 2022 |