| Bloodmoon FX Ltd | Southampton | 2026 |
| Bloodsport Bareknuckle Events Ltd | London | 2025 |
| Bloodstock Tours Limited | Derby | 2018 |
| Bloody Scotland Limited | Edinburgh | 2013 |
| Bloody Sunday Trust - the | Derry | 2000 |
| Bloom and Co Events Ltd | Radlett | 2025 |
| Bloom and Create CIC | Luton | 2025 |
| Bloom Art Academy Ltd | Batley | 2025 |
| Bloom Dance Project Limited | London | 2022 |
| Bloom Festivals Ltd | London | 2023 |
| Bloom Fitness Studio Ltd | Paisley | 2025 |
| Bloom Group International Limited | Huddersfield | 2020 |
| Bloom Netball Limited | Clifton | 2012 |
| Bloom Records Limited | London | 2024 |
| Bloom Reformer Studio Limited | Mickleover | 2025 |
| Bloom Squared Ltd | Horsham | 2021 |
| Bloom Theatre Productions Ltd | London | 2021 |
| Bloom Yoga & Wellbeing Ltd | Ipswich | 2025 |
| Bloomfield INK Limited | London | 2022 |
| Bloomfields Sports Co.Limited | Bath | 1927 |
| Bloomfields Welch Management Ltd | Nottingham | 2004 |
| Bloomin Buds Theatre Company Limited | Bradford | 2017 |
| Bloomin' Arts Limited | Lingfield | 2011 |
| Bloominart Northeast C.I.C. | Hartlepool | 2014 |
| Blooming Dance London Limited | London | 2022 |
| Blooming Fabulous Flowers Ltd | Slough | 2018 |
| Blooming Productions Limited | Borehamwood | 1990 |
| Blooms EN Vogue Ltd | Uxbridge | 2019 |
| Bloomsbury Arts Ltd | London | 2020 |
| Bloomsbury Big Top Limited | Edgware | 2009 |
| Bloomsbury Bowling Limited | Bristol | 2005 |
| Bloomsbury Festival | London | 2012 |
| Bloomsbury Music Ltd | Manchester | 2013 |
| Bloomsbury Square Limited | London | 2023 |
| Bloomsbury Times Limited | Staines | 1987 |
| Bloomsgrove Holdings Ltd | Mansfield | 2024 |
| Bloomtree Ltd | Leeds | 2020 |
| Blossom & Ivory Ltd | Fareham | 2021 |
| Blossom Community HK CIC | London | 2023 |
| Blossom Fit Care Ltd | Burton-On-Trent | 2026 |
| Blossom Garden Pro Limited | Dagenham | 2019 |
| Blossom Media Limited | | 2003 |
| Blossom Tree Productions Limited | London | 2019 |
| Blossomest Blossom Ltd | Sunderland | 2024 |
| Blossoms Music Limited | Manchester | 2016 |
| Blott Works Ltd | Todmorden | 2017 |
| Blount's Clay Shooting Ltd | Derby | 2020 |
| Blow ME SUP Ltd | London | 2025 |
| Blower Hill Records Ltd | Edenbridge | 2020 |
| Blowin' a Hooley Theatre Limited | Newcastle Upon Tyne | 2018 |
| Blowing UP Big Time Limited | Wrexham | 2022 |
| Blowinyamind Entertainment Ltd | Plumstead | 2019 |
| Blown Away by Becks Ltd | Burton-On-Trent | 2025 |
| Blown Fuse Ltd | Rochford | 2016 |
| Blowout Youth CIC | Sheffield | 2025 |
| Blox Events Ltd | London | 2018 |
| Bloxham Coaching Ltd | Leigh-On-Sea | 2018 |
| Bloxwich Golf Club (1988) Limited | Walsall | 1988 |
| Bloxwich Rotary Library Service CIC | Willenhall | 2019 |
| BLP Contracts Limited | Guildford | 2013 |
| BLR Leisure Ltd | Northants | 2004 |
| BLU Fitness Ltd | London | 2023 |
| BLU Fitness MK Ltd | London | 2024 |
| BLU Fitness SW Ltd | Solihull | 2024 |
| BLU Genie Records Ltd | Benfleet | 2020 |
| BLU Hydrangea Ltd | Craigavon | 2020 |
| BLU LUX Limited | Ruislip | 2012 |
| BLU Nightlife Ltd | Upminster | 2016 |
| BLU Shift Creative Ltd | Bristol | 2024 |
| Blu-London Limited | London | 2014 |
| Blubber Studio Ltd | London | 2024 |
| Blubberhouses Moor Limited | Talke | 1991 |
| Blucher Community Boxing Club CIC | Newcastle Upon Tyne | 2025 |
| Bludfest Limited | London | 2023 |
| Bludgeon Inc Limited | Melrose | 2010 |
| Bludgeon Riffola Limited | London | 1982 |
| Bludog Arts Ltd | Brecon | 2017 |
| Blue (EU) Limited | Driffield | 2002 |
| Blue 8 Group Ltd | Studley | 2019 |
| Blue Adventure Records Ltd | London | 2021 |
| Blue Alchemy Labs Ltd | London | 2025 |
| Blue and Blue Limited | Cheltenham | 2017 |
| Blue and Purple Holdings Limited | London | 2024 |
| Blue Angel Limited | York | 1982 |
| Blue AS the Sky Ltd | London | 2017 |
| Blue Atlantic Sport Horses Limited | London | 2020 |
| Blue Badge Bunch CIC | Nottingham | 2024 |
| Blue Bar CIC | London | 2026 |
| Blue Bar Productions Ltd | Hockley | 2022 |
| Blue Barn Music Limited | London | 1999 |
| Blue Bay Club Ltd | London | 2026 |
| Blue Beard Music Limited | London | 1970 |
| Blue Beat Records Ltd | Barnet | 2011 |
| Blue Beetle Ceramics Ltd | Thatcham | 2019 |
| Blue Blood International Ltd | London | 2024 |
| Blue Book Artist Management Ltd | London | 2019 |
| Blue Bottle Audio Ltd | Tadworth | 2018 |
| Blue Box Creative Management Limited | London | 2005 |
| Blue Box Productions Ltd | York | 2017 |
| Blue Brigade Club Limited | Swindon | 2023 |