| Blue Collie Limited | Crich | 2016 |
| Blue Copper Ventures UK Ltd | Hull | 2025 |
| Blue Cosmetics Ltd | Uxbridge | 2015 |
| Blue Count Limited | Bridgwater | 2022 |
| Blue Country Limited | London | 2025 |
| Blue County Limited | Telford | 2017 |
| Blue Cover Limited | London | 2025 |
| Blue Crest Services Limited | London | 2022 |
| Blue Crystal Capital Limited | Wokingham | 2026 |
| Blue Cube (Europe) Ltd | Bedford | 2015 |
| Blue Cuckoo Ltd | Hemel Hempstead | 2016 |
| Blue Dance Limited | London | 2025 |
| Blue Data Limited | London | 2021 |
| Blue Demon Limited | Purley | 2016 |
| Blue Diamond Aesthetics Ltd | London | 2025 |
| Blue Diamond Coach Ltd | Peterborough | 2018 |
| Blue Diamond Creative Limited | Salford | 2017 |
| Blue Diamond Sustainable Investments Ltd | Reading | 2024 |
| Blue Dollar Limited | London | 2022 |
| Blue Dolphin Care Ltd | West Bromwich | 2023 |
| Blue DOT Pictures Ltd | London | 2024 |
| Blue DOT Productions Ltd | Lymm | 2017 |
| Blue Dragon (Hillingdon) Limited | Uxbridge | 1926 |
| Blue Dragon DRY Cleaners Limited | Hillingdon Heath | 1955 |
| Blue Dragon(Beaconsfield)Limited | Middlesex | 1919 |
| Blue Drop Laundry Ltd | Cardiff | 2026 |
| Blue Elevation Ltd | Plymouth | 2019 |
| Blue Emergency Cover Limited | Manchester | 2023 |
| Blue Engineering Limited | Aberdeen | 2011 |
| Blue Estate Agents London Limited | Chertsey | 2013 |
| Blue EYE Media Limited | Leigh-On-Sea | 2024 |
| Blue Eyed Panther Ltd | Alton | 2016 |
| Blue Fast Limited | London | 2025 |
| Blue Feather Spirit Limited | Chippenham | 2018 |
| Blue Feather Trading Limited | Woking | 2012 |
| Blue Fine Limited | London | 2025 |
| Blue Fish Media International Ltd | London | 2022 |
| Blue Fizz Events Limited | Braunton | 2011 |
| Blue Flow Solutions Ltd | Northampton | 2011 |
| Blue Fluro Limited | London | 2024 |
| Blue Foam Ltd | Gravesend | 2019 |
| Blue FOX Communications Limited | Radnage | 2018 |
| Blue FOX Personal & Professional Development Ltd | Lancashire | 2022 |
| Blue Garage Ltd | Bristol | 2024 |
| Blue Gecko Cleaning Ltd | Hollinwood | 2012 |
| Blue Gold Group Limited | Ashby-De-La-Zouch | 2019 |
| Blue Goose Interiors Limited | Borehamwood | 2010 |
| Blue Hair Salon Ltd | Liphook | 2013 |
| Blue Hairdressing Ltd | York | 2006 |
| Blue Harbour 2 Limited | Borehamwood | 2006 |
| Blue Harbour 3 Limited | Borehamwood | 2006 |
| Blue Harbour Limited | Borehamwood | 1987 |
| Blue HAT Dog Training Ltd | Sudbury | 2023 |
| Blue HAT MAN Ltd | London | 2018 |
| Blue Hawk (Lincoln) Ltd | London | 2019 |
| Blue Highlight Ltd | London | 2016 |
| Blue Horizon Cost Consultancy Ltd | West Malling | 2017 |
| Blue Horizon Holding Ltd | London | 2023 |
| Blue Horizons Coastal Adventures CIC | Narberth | 2022 |
| Blue Horn Services Ltd | London | 2022 |
| Blue Horse Design Limited | Stanmore | 2015 |
| Blue Husky Ltd | Exeter | 2020 |
| Blue Indigo Design Limited | Middlesex | 2004 |
| Blue Indigo Limited | Bromley | 2005 |
| Blue IT Systems Ltd | London | 2016 |
| Blue IVY Studio Limited | Liverpool | 2019 |
| Blue Journey Ltd | Colchester | 2019 |
| Blue Labour | Market Drayton | 2017 |
| Blue Labour Campaign Limited | London | 2025 |
| Blue Lagoon Naturals Ltd | London | 2021 |
| Blue Lagoon Laundry Services Ltd | Bolton | 2004 |
| Blue Latern Trading Ltd | Peterborough | 2025 |
| Blue Launderette Services Ltd | Edgware | 2011 |
| Blue Lease Limited | London | 2024 |
| Blue Legend Hairdresser 02 Ltd | London | 2020 |
| Blue Lemon Enterprise Limited | Brighton | 2015 |
| Blue Light Aesthetics Limited | Woking | 2025 |
| Blue Light Investigations & Consultancy Ltd | Pelton Fell | 2019 |
| Blue Light Locksmiths Ltd | Leatherhead | 2026 |
| Blue Light Training Providers Association | Redhill | 2014 |
| Blue Lighthouse Surf CIC | Banff | 2024 |
| Blue Line Ltd | London | 2018 |
| Blue Linen Company Ltd | Manchester | 2023 |
| Blue Linen Company Yorkshire Limited | Manchester | 2025 |
| Blue Lion Limited | Cambridge | 1992 |
| Blue London Hair Limited | London | 2023 |
| Blue Lotus Aesthetic Limited | London | 2024 |
| Blue Lotus Nails Ltd | London | 2017 |
| Blue Lounge Group Ltd | Manchester | 2022 |
| Blue Machinery (Group) Limited | Warrington | 2003 |
| Blue Maleo Ltd | Telford | 2014 |
| Blue Mallow Ltd | Penicuik | 2020 |
| Blue Marble Inc Ltd | London | 2018 |
| Blue Marble Sustainability Ltd | Bishop'S Stortford | 2018 |
| Blue Marlin Advisory Limited | London | 2026 |
| Blue MAX Limited | Trowbridge | 1987 |
| Blue Meow Ltd | Abbots Langley | 2014 |
| Blue Mind Counselling Group Ltd | Bristol | 2026 |
| Blue Moon FOX Limited | Croydon | 2018 |
| Blue Moon Introductions Limited | Ipswich | 2019 |