| Blue Cat Design Ltd | St. Albans | 2015 |
| Blue Catering Equipment Ltd | London | 2023 |
| Blue Cedar Print Works Ltd | Glastonbury | 2013 |
| Blue Chalk Ltd | Sudbury | 2022 |
| Blue Cherry Coffee Company Ltd | Clitheroe | 2023 |
| Blue Chip Marine Limited | Southampton | 2005 |
| Blue Chip Printing Limited | London | 2008 |
| Blue Chip Technology Limited | Chester | 1995 |
| Blue Chip Worldwide Limited | Wiltshire | 2003 |
| Blue Chyp Limited | St. Albans | 2009 |
| Blue Claret Limited | Leicester | 2013 |
| Blue Claw Rugs Ltd | Llandudno | 2025 |
| Blue Cloud Graphics Ltd | Epsom | 2020 |
| Blue Coatings Ltd | Banbridge | 2024 |
| Blue Cooling Ltd | Kendal | 2006 |
| Blue Creation Tech Ltd | Bedford | 2024 |
| Blue Crest Marine Ltd | Southampton | 2024 |
| Blue Crocus Textiles Ltd | Woodbridge | 2021 |
| Blue Cube (GB) Limited | | 2003 |
| Blue Cube Chemicals (UK) Limited | Birmingham | 2013 |
| Blue Cube Fabrications Ltd | Tadley | 2010 |
| Blue Cube Limited | Uxbridge | 1998 |
| Blue Cube Portable Cold Stores Limited | Glasgow | 2005 |
| Blue Cube Seating Limited | London | 2025 |
| Blue Diamond (Leicester) Ltd | Leicester | 2018 |
| Blue Diamond Engineering Limited | Shildon | 1987 |
| Blue Diamond Pumps Ltd | Byfleet | 2014 |
| Blue Diamonds of London Ltd | Brighton | 2021 |
| Blue Donut Games Ltd | Portsmouth | 2021 |
| Blue Door Coffee Ltd | London | 2025 |
| Blue Door Print Ltd | Cobham | 2018 |
| Blue Door Seafoods Ltd | Belfast | 2025 |
| Blue Dragon Energy Limited | Southwark | 2017 |
| Blue Dream Birmingham Limited | Birmingham | 2025 |
| Blue Eagle Precision Ltd | Co Armagh | 2003 |
| Blue Earth Clean Limited | Leven | 2021 |
| Blue Earth Foods Limited | Redditch | 2008 |
| Blue Electric Contractors Limited | Hurstpierpoint | 2019 |
| Blue Electricals Limited | Leamington Spa | 2015 |
| Blue Elephant Catering Equipment Limited | Weston-Super-Mare | 2016 |
| Blue Elevate Ltd | Northallerton | 2025 |
| Blue Engineering Service Ltd | London | 2015 |
| Blue Eyed Sun Ltd | Burgess Hill | 2005 |
| Blue Eyed Sun Trading Ltd | Burgess Hill | 2021 |
| Blue Eyes Biotech Co., Ltd | West Midlands, England | 2023 |
| Blue FIN Seafood Ltd | Liverpool | 2025 |
| Blue FIN Yachts Ltd | Truro | 2006 |
| Blue First Ltd | Dartford | 2021 |
| Blue Flame (Cornwall) Limited | Penryn | 2004 |
| Blue Flame 13 Ltd | London | 2022 |
| Blue Flame Energy Solutions Ltd | Halesowen | 2010 |
| Blue Flame Profiles Ltd | Wolverhampton | 2009 |
| Blue Flamingo Creative Solutions Limited | Bromsgrove | 2018 |
| Blue Flowers Limited | Sale | 2017 |
| Blue Forest Foods Ltd | London | 2024 |
| Blue FOX Laser and CNC Limited | Leicester | 2019 |
| Blue Frame Interiors Ltd | London | 2016 |
| Blue Frame London Ltd | London | 2022 |
| Blue Frog Consultants Limited | Prenton | 2022 |
| Blue Furniture Ltd | Cleckheaton | 2019 |
| Blue Future Environmental Protection Technology Ltd | West Midlands, England | 2025 |
| Blue Gecko (UK) Ltd | Bristol | 2008 |
| Blue Glass London Ltd | London | 2017 |
| Blue Green Planet UK Limited | Belfast | 2010 |
| Blue Green Vision Ltd | Morpeth | 2019 |
| Blue Halo Enterprises Ltd | Telford | 2023 |
| Blue Heron Yachting Ltd | London | 2023 |
| Blue Hexagon Group Limited | Waterlooville | 2024 |
| Blue Horizon Innovation Limited | Wickford | 2020 |
| Blue Hour Coffee Limited | Winchester | 2024 |
| Blue House Beverage Company Limited | Gateshead | 2025 |
| Blue House Point Limited | Stockton-On-Tees | 1962 |
| Blue Hydraulics Limited | Doncaster | 2016 |
| Blue Ice (Seafoods) Limited | North East Lincolnshire | 2001 |
| Blue Icon Trade Ltd | Barking | 2023 |
| Blue Injection Moulding Supplies Limited | Norwich | 2007 |
| Blue INK Limited | Leicester | 2004 |
| Blue Innovation Group(Big) Ltd | London | 2025 |
| Blue Innovations Ltd | Huddersfield | 2023 |
| Blue Island Home Ltd | Nelson | 2015 |
| Blue JAY Openers Limited | Belper | 2022 |
| Blue Jersey Marine Ltd | Penryn | 2024 |
| Blue Jigsaw Limited | Potters Bar | 2003 |
| Blue Joy Technology Co., Ltd | Beckenham | 2026 |
| Blue Knot TOPCO1 Limited | Norwich | 2020 |
| Blue Lagoon (Services) Ltd | Poole | 2021 |
| Blue Lias Marina Limited | Southam | 1988 |
| Blue Lifestyle Ltd | Leamington Spa | 2018 |
| Blue Light Services Group Holdings Limited | Mountain Ash | 2024 |
| Blue Light Services Specialist Vehicles Limited | Fengate | 2018 |
| Blue Line Abrasives Limited | Gloucester | 2023 |
| Blue List Limited | Airdrie | 2019 |
| Blue Lizard Signs Limited | Crawley | 2005 |
| Blue MAC (Manufacturing) Ltd | Dungannon | 2013 |
| Blue Machinery (Scotland) Limited | Stirling | 1997 |
| Blue Maestro Limited | London | 2012 |
| Blue Marine Yachting Limited | Southampton | 2007 |
| Blue Media LDN Limited | Torpoint | 2016 |
| Blue Mesh Solutions Limited | Weybridge | 2020 |
| Blue Mill Limited | | 1999 |