| Blme Wealth Nominees Limited | London | 2022 |
| Blmortgagepartners.Com Limited | Hyde | 2026 |
| Blms Capital Limited | London | 2015 |
| BLN Loan Syndicates Limited | Ashby-De-La-Zouch | 2010 |
| Blno Investment Holdings Limited | London | 2026 |
| Blobbins Ltd | York | 2025 |
| Bloc Asset Co Limited | London Heathrow Airport | 2019 |
| Bloc Capital I Limited | Haslemere | 2025 |
| Bloc Core Limited | Haslemere | 2025 |
| Bloc Cornwall Group Limited | Falmouth | 2020 |
| Bloc Group Limited | Cwmbran | 2020 |
| Bloc Gruppe Limited | Liss | 2017 |
| Bloc Holdings Ltd | Derby | 2013 |
| Bloc Ventures Management Limited | London | 2021 |
| Block & Sharp Holdings Limited | Warrington | 2024 |
| Block 4 CW (LUV) Limited | Manchester | 2025 |
| Block 9 Holdings Ltd | Doncaster | 2021 |
| Block 9 Investments Ltd | Doncaster | 2022 |
| Block and Reserve Ltd | Braintree | 2025 |
| Block Capital Partners Limited | London | 2025 |
| Block Finance Ltd | Bury | 2026 |
| Block Group Limited | Exeter | 2026 |
| Block One Investments Limited | Southend-On-Sea | 2017 |
| Block Technology Holdings Limited | London | 2014 |
| Block's Concrete Group Ltd | Nantwich | 2020 |
| Blockade Environmental Group Limited | Horley | 2011 |
| Blockberg UK Ltd | London | 2026 |
| Blockchain Capital Consulting Ltd | London | 2024 |
| Blockchain Cloudworld Co., Ltd | London | 2021 |
| Blockchain Consultants Ltd. | Royston | 2011 |
| Blockchain Infrastructure Alliance Limited | Cambridge | 2021 |
| Blockchain Management Limited | Southampton | 2025 |
| Blockchain Media Solutions Ltd | London | 2024 |
| Blockchain Solutions Ltd | Hitchin | 2015 |
| Blockchain Technology Holdings Ltd | Lymington | 2016 |
| Blockforge Capital Ltd | Prenton | 2026 |
| Blockforj Limited | Stockport | 2025 |
| Blockhaus Ltd | Swindon | 2025 |
| Blockhead Holdings Limited | Dorking | 2024 |
| Blockland Holdings Ltd | Kingswinford | 2026 |
| Blockmole Limited | London | 2021 |
| Blockridge Limited | Barry | 2023 |
| Blockriver UK Ltd | Manchester | 2025 |
| Blocks Capital Ltd | Calne | 2022 |
| Blocksmart Capital Ltd | Wantage | 2022 |
| Blockstone Holdings Ltd | London | 2021 |
| Blocktimum Digital Assets PLC | Egham | 2015 |
| Blocktimum Investments Ltd | Egham | 2018 |
| Blockzo Ltd | London | 2021 |
| Bloemkippen Capital Ltd | London | 2024 |
| Blofeld Group Ltd | Manchester | 2025 |
| Blogg's Group Ltd | Southampton | 2026 |
| Blok 'N' Mesh Holdings Limited | Leytonstone | 2020 |
| Blok Group Limited | Bath | 2025 |
| Blomb Limited | London | 2025 |
| Blomfield Capital Ltd | London | 2024 |
| Blomfield Mortgage Services Ltd | Southend-On-Sea | 2023 |
| Blond Consulting Limited | Farnham | 2010 |
| Blonde Oak Holdings Limited | Wells | 2026 |
| Blonde Pixie Ltd | Holsworthy | 2024 |
| Blondefish Group Ltd | Canvey Island | 2023 |
| Blondie Bakery Ltd | Stockton-On-Tees | 2023 |
| Blondie Brownie Holdings Ltd | Paisley | 2021 |
| Bloo Moon Limited | Leicester | 2013 |
| Blood Brothers Holdings Ltd | Chesterfield | 2025 |
| Blood Holdings Limited | Windsor | 2019 |
| Bloodstone Capital International Asset Management Limited | St. Neots | 2025 |
| Bloodstone Capital International Holdings Limited | St. Neots | 2025 |
| Bloodstone Group Ltd | London | 2025 |
| Blooloop Group Limited | Devon | 2024 |
| Bloom & Co Holdings Limited | Frinton-On-Sea | 2026 |
| Bloom and Wild Holdings Limited | London | 2021 |
| Bloom and Wild Midco 1 Limited | London | 2021 |
| Bloom and Wild Midco 2 Limited | London | 2021 |
| Bloom at London Holdings Ltd | London | 2024 |
| Bloom Bess Finco Limited | London | 2024 |
| Bloom Bess Holdco Limited | London | 2024 |
| Bloom Boutique Holdings Ltd | Exeter | 2019 |
| Bloom Broking (Number 2) Limited | Retford | 2019 |
| Bloom Buddie Limited | London | 2015 |
| Bloom Carehome Ltd | Poole | 2026 |
| Bloom Enterprise Limited | St. Albans | 2019 |
| Bloom Financial Consulting Limited | London | 2022 |
| Bloom Financial Design Limited | Worthing | 2018 |
| Bloom Financial Limited | Worthing | 2025 |
| Bloom Financial Services Limited | London | 2023 |
| Bloom Fresh International Holdco Limited | London | 2022 |
| Bloom Fresh International Limited | London | 2022 |
| Bloom Global Holdings Limited | Crowborough | 2024 |
| Bloom HQ Ltd | London | 2026 |
| Bloom Insurance Services Limited | Frodsham | 2018 |
| Bloom Klein & Lang Accountants Ltd | London | 2017 |
| Bloom Medical Intermediary Limited | Manchester | 2021 |
| Bloom Properties Limited | Harrow | 2017 |
| Bloom Rowe Ltd | Fitzrovia | 2025 |
| Bloom Season UK Limited | London | 2022 |
| Bloom Seed Bidco Limited | Ely | 2024 |
| Bloom Services Capital II Ltd | London | 2022 |
| Bloom Services Capital Ltd | London | 2021 |
| BLOOM91 Limited | Hitchin | 2026 |