| Blue Vector Systems Ltd | London | 2026 |
| Blue Velvet (LON) Ltd | London | 1998 |
| Blue Volt Ltd | London | 2024 |
| Blue Water (Springs) Limited | Leicester | 2000 |
| Blue Water Expeditions Ltd | London | 2021 |
| Blue Water Gardens Limited | Leicester | 2000 |
| Blue Waters (Information Services) Limited | Barnstaple | 2001 |
| Blue Wembury Ltd | Bath | 2013 |
| Blue Whale Holding Co Ltd | Beckenham | 2019 |
| Blue Whale Song Ltd | London | 2020 |
| Blue Willow Springs Limited | Dungannon | 2011 |
| Blue Yachting Ltd | London | 2016 |
| Blue Zeal SW Ltd | Exmouth | 2023 |
| Blue-Blooded Noble International Group Ltd | London | 2017 |
| BLUE4 Behaviour Limited | Colchester | 2012 |
| BLUE4 Culture Limited | Colchester | 2012 |
| BLUE4 Performance Limited | Colchester | 2015 |
| Bluearc Technologies Ltd | London | 2025 |
| Bluebay Nutrition Ltd. | Manchester | 2018 |
| Bluebean Limited | Berkhamsted | 2002 |
| Bluebell (Crewe) Limited | Stoke-On-Trent | 1987 |
| Bluebell Care Ltd | Birmingham | 2023 |
| Bluebell Nursery Limited | Wembley | 2011 |
| Bluebells of Henley Limited | Reading | 2013 |
| Blueberries Waves Ltd | London | 2021 |
| Blueberry Foods Limited | Leicestershire | 2007 |
| Blueberry Gate Enterprises Ltd | Doncaster | 2026 |
| Bluebest International Ltd | Stafford | 2016 |
| Bluebird Airways Limited | Bath | 2011 |
| Bluecan Limited | Northwich | 2014 |
| Bluecastle Capital Nominees Ltd | London | 2024 |
| Bluecats Holdings UK Limited | London | 2015 |
| Bluechip General Trading Ltd | Manchester | 2026 |
| Bluechip Lodge Hotels Ltd | Stoke-On-Trent | 2012 |
| Bluecourt Ltd | Leigh On Sea | 2022 |
| Blueday Management Ltd | Birmingham | 2018 |
| Bluedoor Estates Limited | London | 2020 |
| Bluefarm Ltd. | London | 2012 |
| Bluefern Enterprises Ltd | Hartlepool | 2026 |
| Bluefield Holdco Limited | Bristol | 2022 |
| Bluefinch Communications Limited | London | 2025 |
| Bluefinled Marine Lighting Ltd | Bristol | 2025 |
| Bluefinled Underwater Lighting Ltd | Bristol | 2025 |
| Bluefisk Limited | London | 2017 |
| Bluegate Leisure Limited | Birmingham | 2009 |
| Bluegene Biotechnology Ltd | Cardiff | 2018 |
| Bluegene Ltd | London | 2016 |
| Bluegreen Financial Ltd | Poole | 2011 |
| Blueharbor Metrics Ltd | Doncaster | 2026 |
| Blueharbour Innovations Ltd | Doncaster | 2026 |
| Blueharbour Logistics Ltd | Doncaster | 2026 |
| Bluehaven Analytics Ltd | Doncaster | 2026 |
| Bluehaven Consulting Ltd | Doncaster | 2026 |
| Bluehaven Energy Ltd | Doncaster | 2026 |
| Bluehaven for Trading Ltd | Manchester | 2025 |
| Blueheart Limited | Harrow | 1999 |
| Bluejune Limited | Ashtead | 2015 |
| Bluelace Limited | London | 1994 |
| Blueline Conferences Ltd | Birmingham | 2015 |
| Bluemarlik Ltd | Lytham | 2011 |
| Bluemay Multicap Limited | Melksham | 1986 |
| BLUEMOON1 Limited | Bromley | 2023 |
| Bluemore 5 Limited | Kendall | 2026 |
| Bluepeak for Construction Ltd | Manchester | 2025 |
| Bluepeak for Services Limited | Manchester | 2026 |
| Bluepeak for Trading & Services Ltd | Manchester | 2026 |
| Bluepink Ltd | London | 2024 |
| Bluepoint (UK) Ltd | Preston | 2014 |
| Blueprint Collective Limited | London | 2024 |
| Blueprint for Immortality Limited | London | 2022 |
| Blueprint Investments (London) Limited | Brentwood | 2012 |
| Blueprint Network Limited | Chichester | 2006 |
| Blueprint Property Group Limited | Wickford | 2019 |
| Blueprint Tableware Limited | Birmingham | 1998 |
| Blueprintbravo Design Ltd | London | 2026 |
| Bluerock for Investment & Trading Limited | Manchester | 2026 |
| Bluerock for Investment Limited | Manchester | 2026 |
| Blueroom Developments Limited | Ripley | 2004 |
| Blues Stable Software Limited | Bolton | 2015 |
| Bluesave Limited | London | 2009 |
| Bluescape Software Limited | London | 1986 |
| Bluesea Co. Ltd | London | 2025 |
| Bluesea Winway International Ltd | Beckenham | 2013 |
| Bluesky Business Services Limited | Ferryhill | 2026 |
| Bluesky Certification Ltd | Wokingham | 2016 |
| Bluesky for Investment Limited | Manchester | 2026 |
| Bluesky Managed Payroll Services Limited | Sunderland | 2015 |
| Bluesky Partners Limited | London | 2024 |
| Blueskye Associates Ltd | Harrow | 2011 |
| Blueskytec ICS Ltd | Wells | 2018 |
| Blueskytec IOT Ltd | Wells | 2018 |
| Blueskytec Transport Ltd | Wells | 2018 |
| Bluesouth Limited | London | 2010 |
| Bluestar Homecare Ltd | Taunton | 2017 |
| Bluestar Inc Limited | Hitchin | 2013 |
| Bluestone Credit Management Limited | Sheffield | 2019 |
| Bluestone for General Trading Limited | Manchester | 2026 |
| Bluestone for Trading Limited | Manchester | 2026 |
| Bluestone Retail Finance Limited | Sheffield | 2012 |
| Bluetech Pump Co., Ltd. | London | 2014 |