| Blenheim Schools Group Limited | Bolton | 2024 |
| Blenheim Underwriting Limited | London | 2016 |
| Blenheim Wealth Management Limited | Kidlington | 1999 |
| Blenkie Limited | Manchester | 2013 |
| Bleriot & Catherall Holdings Ltd | Borehamwood | 2020 |
| Bleriot Bidco Limited | London | 2019 |
| Bleriot Finco Holdings Limited | London | 2019 |
| Bleriot Finco Limited | London | 2019 |
| Bleriot Midco Limited | London | 2019 |
| Blesh Holdings Ltd | Loughborough | 2022 |
| Blesh Limited | London | 2013 |
| Bless Business Services Ltd | London | 2024 |
| Blessed & Parkyn Holdings Limited | St. Austell | 2021 |
| Blessed Capital Ventures Limited | London | 2026 |
| Blessed Exchange Limited | London | 2019 |
| Blessed Investments Ltd | London | 2018 |
| Blessington Holdings Ltd | Liverpool | 2019 |
| Blest Smith Financial Services Ltd. | Rochester | 2013 |
| Blestium Financial Services Ltd. | Monmouth | 2020 |
| Bletchley Bidco Limited | Reading | 2020 |
| Bletchley Financial Ltd | Sheffield | 2021 |
| Bletchley Industries Limited | St. Albans | 2025 |
| Bletchley Midco Limited | Reading | 2020 |
| Bletchley Park Funding 2024-1 Holdings Limited | London | 2024 |
| Bletchley Park Funding 2024-1 PLC | London | 2024 |
| Bletchley Park Funding 2025-1 Holdings Limited | London | 2025 |
| Bletchley Park Funding 2025-1 PLC | London | 2025 |
| Bletchley Park Funding 2026-1 Holdings Limited | London | 2026 |
| Bletchley Park Funding 2026-1 PLC | London | 2026 |
| Bletchley Topco Limited | Reading | 2020 |
| Blethryn Limited | Stratford-Upon-Avon | 2017 |
| Bleu Box Group Limited | Hull | 2026 |
| Bleu Capital Limited | Scarborough | 2024 |
| Bleu Holdings Limited | Bedford | 2019 |
| Bleu Squared Limited | Hull | 2024 |
| Blevin Limited | Nuneaton | 2006 |
| Blewett's Holdings Limited | Truro | 2021 |
| Bleyt Limited | London | 2022 |
| BLF Group Ltd | Calne | 2019 |
| BLG Administration Ltd. | London | 2021 |
| BLG Holdings Ltd | Glasgow | 2021 |
| BLG Investment Limited | London | 2019 |
| BLG Mezzanine Co-Lending Limited | London | 2015 |
| BLG Wealth Ltd | London | 2011 |
| BLH Financial Services Ltd | Ellesmere Port | 2018 |
| BLH Holdings Limited | Southampton | 2023 |
| BLH Properties Ltd | Uckfield | 2015 |
| Blhc Holdings Ltd | London | 2025 |
| Blhc Ltd | Stamford | 2022 |
| BLI Holdings Ltd | Preston | 2024 |
| Blick Rothenberg Holdco Limited | London | 2016 |
| Blie Limited | London | 2022 |
| Bligh Financial Management Ltd | Southampton | 2002 |
| Blighton Lane Land Holdings Ltd | Hants, | 2022 |
| Blind Faith Holdings Limited | London | 2022 |
| Blind Screen Ventures Ltd | Derby | 2023 |
| Blind Squirrel Relationship Management Limited | Beckenham | 2016 |
| Blindburn Assets Limited | Northumberland | 2019 |
| Blindmaker (Holdings) Ltd | Gateshead | 2021 |
| Blindside Consulting Limited | Leeds | 2024 |
| Blink Capital Ltd | London | 2025 |
| Blink Charging Holdings UK Limited | St. Albans | 2015 |
| Blink Group Limited | Preston | 2015 |
| Blink House Limited | Oldbury | 2025 |
| Blink Intermediary Solutions Ltd | Southend-On-Sea | 2011 |
| Blink Parametric Holdings Limited | London | 2023 |
| Blink Tyler Limited | Cheltenham | 2008 |
| Blinko Crypto Arbitrage Limited | London | 2025 |
| Blinko Limited | London | 2018 |
| Blinktown Group Ltd | Surbiton | 2021 |
| Blinnio Partners Ltd | London | 2017 |
| Blinqpay Fintech UK Limited | London | 2023 |
| Blinqpay Ltd | London | 2020 |
| Blippar Group Limited | London | 2019 |
| Blippar ME Limited | London | 2025 |
| Blis Group Limited | London | 2021 |
| Blis Holdco Limited | London | 2022 |
| Blis International Limited | Colchester | 2016 |
| Bliss Estate Planning Limited | Wigan | 2025 |
| Bliss Financial Solutions Ltd | Darlington | 2019 |
| Bliss Mortgage Brokers Limited | Wigan | 2017 |
| Bliss Newco Limited | Chester | 2020 |
| Bliss Vending Ltd | London | 2025 |
| Blisworth Hill Holdings Limited | Towcester | 2023 |
| Blitzen Securities NO.1 Holdings Limited | London | 2020 |
| Blitzen Securities NO.1 PLC | London | 2020 |
| Blitzen Three Limited | London | 2015 |
| Blitzen Two Limited | London | 2015 |
| Bliu Limited | London | 2025 |
| Blizzard & Finch Holdings Ltd | Exeter | 2020 |
| Blizzard Holdings Limited | London | 2024 |
| Blizzard Utility Holdings Limited | Hemel Hempstead | 2011 |
| BLJ Holdings Limited | Wilmslow | 2020 |
| BLK Panther Ltd | London | 2026 |
| BLK Holdings Limited | London | 2016 |
| Blk.Fx Ltd | Borehamwood | 2021 |
| BLL Nominee Ltd | Macclesfield | 2022 |
| BLM Christopher LEE Financial Services Limited | Rotherham | 1999 |
| BLM Wellness Ltd | London | 2026 |
| Blme Holdings Limited | London | 2013 |