| Blue Ridge Mortgages Limited | Bradford | 2019 |
| Blue Rinse Holdings Limited | Leeds | 2016 |
| Blue RIO Ltd | Huntingdon | 2020 |
| Blue Rivers Asset Management Limited | Wilmslow | 2023 |
| Blue Rock Brokers (Holdings) Ltd | Ayr | 2014 |
| Blue Rock Insurance Brokers Ltd | Ayr | 2014 |
| Blue Rock Mortgages Ltd | Westcliff On Sea | 2020 |
| Blue Rocket SME Services Ltd | Dartford | 2013 |
| Blue Rooms Group Limited | Ormskirk | 2025 |
| Blue Rose Ventures Ltd | Woodford Green | 2022 |
| Blue Rubicon (Holdings) Limited | London | 2012 |
| Blue Runway Ltd | Tadworth | 2025 |
| Blue Sapphire Middle East Investments Limited | Bradford | 2022 |
| Blue Sapphire Mortgages Limited | Southend-On-Sea | 2024 |
| Blue Satellite Holdings Limited | Edgware | 2020 |
| Blue Scissors Ltd | London | 2011 |
| Blue Scorpio Limited | Bath | 2014 |
| Blue Sea Development Holdings Limited | Dagenham | 2023 |
| Blue Seas Adjusters (London) Ltd | Welham Green | 2022 |
| Blue Seas Adjusters Limited | Hatfield | 2005 |
| Blue Shield Capital (12) Limited | London | 2021 |
| Blue Shield Capital (13) Limited | London | 2021 |
| Blue Shield Capital (14) Ltd | London | 2021 |
| Blue Shield Capital (15) Limited | London | 2021 |
| Blue Shield Capital (18) Limited | London | 2022 |
| Blue Shield Capital (50) Limited | London | 2022 |
| Blue Shield Capital (BHP) Limited | London | 2026 |
| Blue Shield Capital Limited | London | 2020 |
| Blue Shield Insurance Services Limited | Kent | 1974 |
| Blue Shield Ventures Limited | London | 2025 |
| Blue Ship Corporation Limited | Kingston Upon Thames | 1985 |
| Blue Ship Underwriting Limited | London | 1998 |
| Blue Skies Ptnrs Holdings Limited | Sandy | 2019 |
| Blue Skies Wealth Management Ltd | Maidstone | 2018 |
| Blue Sky Advisory Solutions Limited | Glasgow | 2018 |
| Blue Sky Contracts Limited | King'S Lynn | 2014 |
| Blue Sky Equity Limited | Brecon | 2017 |
| Blue Sky Family Wealth Management Ltd | Preston | 2024 |
| Blue Sky Financial Group Limited | Beckenham | 2018 |
| Blue Sky Financial Limited | Wirral | 2016 |
| Blue Sky Financial Planning Limited | Poole | 2002 |
| Blue Sky FS Ltd | Oldham | 2025 |
| Blue Sky International Finance Limited | Gravesend | 2023 |
| Blue Sky Natural Resources Limited | London | 2016 |
| Blue Sky Nine Limited | Crewe | 2024 |
| Blue Sky Tech Solutions Ltd | London | 2024 |
| Blue Sky Tech Ventures Limited | London | 2015 |
| Blue Sky Topco Limited | London | 2025 |
| Blue Sky Wealth Ltd | Wirral | 2017 |
| Blue Sky Yonder Limited | Penrith | 2007 |
| Blue Skye Holdings Limited | Glasgow | 2025 |
| Blue Skyves Investments Ltd | Canterbury | 2019 |
| Blue Slab Limited | Welwyn Garden City | 2024 |
| Blue Slate Ventures Ltd | London | 2025 |
| Blue Snow Investments Limited | Edgware | 2021 |
| Blue Song Consulting Ltd | Stanmore | 2025 |
| Blue Sparkle Investments Ltd | Rushden | 2024 |
| Blue Spire Financial Planning Limited | Chichester | 2009 |
| Blue Spire Independent Financial Advice Limited | Eastwood | 2013 |
| Blue Square (Scotland) Ltd | Ayr | 2021 |
| Blue Square Capital Limited | London | 2021 |
| Blue Square Financial Limited | Colchester | 2017 |
| Blue Squirrel Asset Management Limited | Berkhamsted | 2025 |
| Blue Staff Holdings Limited | Woodmansey | 2025 |
| Blue Stag Property Ltd | Cardigan | 2019 |
| Blue Stamp Holdings Limited | Nottingham | 2023 |
| Blue Star 101 Limited | Coatbridge | 2024 |
| Blue Star Business Solutions Limited | Basingstoke | 2004 |
| Blue Star Capital Management Limited | London | 2017 |
| Blue Star Syndicate Management Limited | London | 2010 |
| Blue Star Thistle Ltd | Newcastle Upon Tyne | 2025 |
| Blue Starz Consultant Ltd | Dartford | 2020 |
| Blue Stone 24 Ltd | Brighton | 2024 |
| Blue Stone Financial Services Ltd | Southampton | 2023 |
| Blue Stone Holdings (NE) Limited | Stockton On Tees | 2025 |
| Blue Storage Group Limited | Cardiff | 2022 |
| Blue Storm Holdings Ltd | London | 2023 |
| Blue Strawberry Financial Services Ltd | Wirral | 2013 |
| Blue Strawberry Mortgages Limited | Ilkley | 2014 |
| Blue Streak FX Ltd | Solihull | 2026 |
| Blue Summit Capital Limited | London | 2025 |
| Blue Table Holdings Limited | London | 2025 |
| Blue Tantalum Holdings Limited | Poynton | 2025 |
| Blue Temple Holding Limited | Cheltenham | 2025 |
| Blue Things Limited | Grantham | 2015 |
| Blue Thistle FIC Limited | Dunfermline | 2026 |
| Blue Tiger Holdings Limited | Chelmsford, Essex | 2021 |
| Blue TIT Salons Ltd | London | 2024 |
| Blue Traders Ltd | Orpington | 2019 |
| Blue Trading Group Ltd | Birmingham | 2026 |
| Blue Triangle Holdings Limited | Winnersh Triangle | 2024 |
| Blue Trident Holdings Ltd | Edinburgh | 2020 |
| Blue Umbrella Risk Management Limited | Altrincham | 2016 |
| Blue Valley Finance Ltd | London | 2023 |
| Blue Valley Holdings Ltd | London | 2023 |
| Blue Water Capital Limited | Birmingham | 2017 |
| Blue Water Insights Limited | London | 2026 |
| Blue Water Investment Group Limited | Bolton | 2023 |
| Blue Waters Limited | Boston | 2009 |
| Blue Wave Financial Ltd | London | 2025 |