| Billflow Wirral Limited | Professional & scientific | 2020 |
| Billy Bunter's (North West) Ltd | Hospitality | 2022 |
| Billy's Fast Food Limited | Wholesale & retail | 2002 |
| Bingham Hart Ltd | Professional & scientific | 2023 |
| Binomial Limited | Other services | 2016 |
| Bioprolabs Ltd | Wholesale & retail | 2023 |
| Biosensors Ltd | Extraterritorial | 2020 |
| Birkdale Park Land Company Limited | Financial services | 1874 |
| Birkenhead Brewery Company Ltd | Manufacturing | 2018 |
| Birkenhead Car and Van Hire Limited | Administrative & support | 1993 |
| Birkenhead Drive Thru Cinema Ltd | Arts & recreation | 2025 |
| Birkenhead Driving School Limited | Education | 2015 |
| Birkenhead Market Services Limited | Real estate | 2002 |
| Birkenhead School | Education | 2002 |
| Birkenhead Utilities Ltd | Construction | 2024 |
| Birket Driver Training Limited | Education | 2026 |
| BISERVICES511 Ltd | Manufacturing | 2022 |
| Bishop Marine Ltd | Administrative & support | 2024 |
| Bison Orthopaedics Ltd | Manufacturing | 2025 |
| Bistro 29 Ltd | Hospitality | 2026 |
| Bistros Moreton Ltd | Hospitality | 2025 |
| Bitventure Ltd | Information & communication | 2012 |
| Bizwebchannels Ltd | Information & communication | 2012 |
| BJ MAC Consulting Ltd | Professional & scientific | 2024 |
| Bj's Cafes Limited | Hospitality | 2003 |
| BJM Power Engineering Ltd | Other services | 2020 |
| BJM SEG Ltd | Other services | 2022 |
| BK Contracting Renewables Ltd | Construction | 2025 |
| BKIND2U Ltd | Other services | 2025 |
| BKR Commercial Ltd | Professional & scientific | 2023 |
| BL Joinery Ltd | Construction | 2022 |
| Black Cat Houses Ltd | Real estate | 2025 |
| Black LAB Developments Ltd | Construction | 2026 |
| Black One Sugar Ltd | Arts & recreation | 2018 |
| Black Spark Media Limited | Professional & scientific | 2016 |
| Blackhare Boutique Limited | Manufacturing | 2023 |
| Blackheath Teaching Practice Limited | Real estate | 2010 |
| Blackrock Customs Ltd | Wholesale & retail | 2020 |
| Blackstock Property Holdings Limited | Real estate | 2024 |
| Blackstone Legal Limited | Administrative & support | 2017 |
| Blackwater Geological Consulting Limited | Other services | 2018 |
| Blade Consultants Limited | Administrative & support | 1997 |
| Blake-Kearney Family Ltd | Real estate | 2026 |
| Blanc MD LLP | | 2023 |
| Blank Canvas Developments Limited | Real estate | 2003 |
| BLC Property Ltd | Real estate | 2019 |
| Blee Ltd | Information & communication | 2018 |
| Blind COW Pensby Ltd | Hospitality | 2026 |
| Bloomies Limited | Hospitality | 2025 |
| Bloomika Thai & Co Ltd | Hospitality | 2026 |
| Blooming Skull Coffee Ltd | Hospitality | 2024 |
| Blooming Ventures Limited | Information & communication | 2013 |
| Bloomsbury Court (Hoylake) Limited | Households | 1999 |
| Blossom Scan Limited | Health & social care | 2023 |
| BLS Consulting Ltd | Professional & scientific | 2025 |
| BLS Legal Services LLP | | 2023 |
| Blubridge Properties Ltd | Real estate | 2022 |
| Blue Boxx Limited | Construction | 2000 |
| Blue Bricks Club Ltd | Information & communication | 2026 |
| Blue BUS (Consultants) Limited | Construction | 2012 |
| Blue Cirt Ltd | Wholesale & retail | 2025 |
| Blue FIN Estates Limited | Real estate | 2015 |
| Blue Frog Creative Ltd | Information & communication | 2025 |
| Blue Frog Security Solutions Limited | Administrative & support | 2026 |
| Blue Liquorice Ltd | Extraterritorial | 2010 |
| Blue Ocean Media Limited | Information & communication | 2013 |
| Blue Ramina Limited | Information & communication | 2025 |
| Blue Reel Limited | Construction | 2019 |
| Blue Sky BIO Ltd | Water & waste | 2013 |
| Blue Sky Financial Limited | Financial services | 2016 |
| Blue Sky Ventures Limited | Real estate | 2020 |
| Blue Sky Wealth Ltd | Financial services | 2017 |
| Blue Strawberry Financial Services Ltd | Financial services | 2013 |
| Blue Strawberry Property Ltd | Real estate | 2006 |
| Blue Summit Holdings Ltd | Professional & scientific | 2025 |
| Blue Turtle Properties Ltd | Real estate | 2025 |
| Blue Water Health & Safety Consultancy Services Ltd | Professional & scientific | 2016 |
| Bluebell Day Nursery Bebington Limited | Health & social care | 2008 |
| Bluebell Tearoom/Cafe the Turret Limited | Hospitality | 2025 |
| Bluebird Coaching and Consultancy Ltd | Professional & scientific | 2025 |
| Bluebird Film & TV Limited | Information & communication | 2021 |
| Bluehaven Property Group Ltd | Households | 2026 |
| Bluehouse Developments NW Ltd | Real estate | 2024 |
| Bluerobin Software Ltd | Information & communication | 2024 |
| Bluestreak Consulting Limited | Information & communication | 2010 |
| Blueworks Oims UK Limited | Information & communication | 2018 |
| Blush Bar (NW) Ltd | Other services | 2009 |
| BM Developments NW Limited | Construction | 2018 |
| BMC British Motorcycles Ltd | Manufacturing | 2021 |
| Bmjv Ltd | Real estate | 2024 |
| BMP Wirral Ltd | Real estate | 2022 |
| BMT Property Limited | Real estate | 2020 |
| BNB Equities Limited | Real estate | 2024 |
| Bnet Investment Company Limited | Real estate | 2005 |
| Bntf Group Limited | Professional & scientific | 2015 |
| BOB Smith's Garage Limited | Wholesale & retail | 2012 |
| Bobby and Sons Properties Ltd | Real estate | 2019 |
| BOD Eryl Ltd | Construction | 2022 |
| Body & Paint Limited | Wholesale & retail | 2020 |
| Bodyline Vehicle Signs Limited | Manufacturing | 2005 |