| Barmas Ltd | Transport & logistics | 2016 |
| Barrett & Sons Limited | Real estate | 2018 |
| Barry Road Property Management Company Limited | Real estate | 2013 |
| Barry Wise Mortgages Ltd | Financial services | 2024 |
| Basmati Restaurant Limited | Hospitality | 2012 |
| Bassy Couture Ltd | Hospitality | 2025 |
| Batter UP Ltd | Hospitality | 2025 |
| Bayco Walker Holding Ltd | Real estate | 2025 |
| Baynes Wipers Ltd | Manufacturing | 2026 |
| Bays S Ltd | Construction | 2026 |
| BB Botanica Bars Ltd | Hospitality | 2024 |
| BBG Productions Limited | Information & communication | 2024 |
| BBR International Ltd | Wholesale & retail | 2015 |
| BD Takeaway Ltd | Hospitality | 2022 |
| Bdfit Ltd | Arts & recreation | 2025 |
| BE Afrique Limited | Wholesale & retail | 2025 |
| BE My Guest Salon Ltd | Other services | 2014 |
| BE Skincare Ltd | Wholesale & retail | 2025 |
| BE the Goat Ltd | Administrative & support | 2021 |
| Beach Tower Southsea Ltd | Real estate | 2021 |
| Beacon Recruitment Services Limited | Administrative & support | 2002 |
| Bearhead Limited | Information & communication | 2021 |
| Beautiful Bathrooms Ltd | Construction | 2026 |
| Beauty Hair Salon Limited | Other services | 2016 |
| Bechiro Limited | Health & social care | 2020 |
| Becomfy Limited | Health & social care | 2022 |
| Bedford Broadway Apartments Ltd | Real estate | 2025 |
| Bedford Broadway Development Ltd | Real estate | 2018 |
| Bedmond Developments (UK) Limited | Real estate | 2012 |
| Beech Wylde Ltd | Manufacturing | 2025 |
| Belaruby Ltd | Wholesale & retail | 2025 |
| Bell Consortium Limited | Information & communication | 2002 |
| Bell Network Systems Limited | Information & communication | 2000 |
| Bella MIA Gelato Limited | Hospitality | 2018 |
| Bellalou Consulting Ltd | Professional & scientific | 2019 |
| Bellalou Ltd | Real estate | 2020 |
| Bellamy Heather Ltd | Hospitality | 2026 |
| Belle Rose Capital Ltd | Real estate | 2026 |
| Beneficial Business Solutions Ltd | Administrative & support | 2016 |
| Beneh Solutions Limited | Information & communication | 2025 |
| Bengal Pizza Ltd | Hospitality | 2016 |
| Bentleys Tailors Limited | Wholesale & retail | 2002 |
| Beprotected Limited | Financial services | 2020 |
| Beravail Concepts Ltd | Information & communication | 2024 |
| Berio Estates Ltd | Households | 2025 |
| Bernards City Ltd | Real estate | 2019 |
| Bernards Commercial Ltd | Real estate | 2024 |
| Bernards Estate and Letting Agents Ltd | Real estate | 2015 |
| Bernards Premier Rent Service Ltd | Real estate | 2016 |
| Berty & Gerty Limited | Wholesale & retail | 2006 |
| Beside the Sea Limited | Real estate | 2018 |
| Bespoke Estates Limited | Hospitality | 1999 |
| Bestswitch Ableservices Ltd | Health & social care | 2024 |
| Beyond Infinity Services Ltd. Ltd | Administrative & support | 2024 |
| Bezant.Uk.Net Limited | Information & communication | 2002 |
| BH Dental Recruitment Ltd | Administrative & support | 2026 |
| BH West Ltd | Real estate | 2022 |
| Bharat D Hathi Limited | Professional & scientific | 2004 |
| Big Bricks Construction Limited | Construction | 2022 |
| Big MAN Thing Clothing Ltd | Wholesale & retail | 2025 |
| Big Powerhouse Wrestling Ltd | Arts & recreation | 2023 |
| Big Rocket Marketing Ltd | Administrative & support | 2005 |
| Big-Bristol Limited | Administrative & support | 2013 |
| Bildt Ltd | Construction | 2021 |
| Billy Kail Hairstylist Limited | Other services | 2017 |
| Bino Trading Ltd | Education | 2022 |
| BIO Peptides UK Ltd | Professional & scientific | 2025 |
| Biomass-G Limited | Administrative & support | 2022 |
| BJP Projects Ltd | Construction | 2022 |
| Black 22 Works Ltd | Professional & scientific | 2023 |
| Black Anchor Studios Limited | Information & communication | 2015 |
| Black Book Consultancy Ltd | Professional & scientific | 2025 |
| Black Kite Racing Ltd | Extraterritorial | 2015 |
| Black OWL Estates Ltd | Real estate | 2021 |
| Blackjack Properties Ltd | Real estate | 2011 |
| Blackmore Electrical Services Limited | Construction | 2015 |
| Blimp Studio Ltd | Information & communication | 2024 |
| Blooming Lovelies Ltd | Wholesale & retail | 2019 |
| Blossom Boutique Limited | Wholesale & retail | 2021 |
| BLU Mauve Limited | Administrative & support | 2017 |
| Blue FOX Groundworks and Civils Limited | Construction | 2019 |
| Blue Sky Portsmouth Limited | Hospitality | 2023 |
| Blue Star Asbestos Limited | Professional & scientific | 2015 |
| Blue's Eatery Ltd | Hospitality | 2023 |
| Bluefrog Cleaning Services Limited | Administrative & support | 2016 |
| Bluis Travel Ltd | Transport & logistics | 2026 |
| BMC Services Carpentry & Building Contractors Limited | Construction | 2014 |
| BMG Nexus Limited | Wholesale & retail | 2023 |
| BMR Interiors Ltd | Construction | 2015 |
| Bmst Management Limited | Extraterritorial | 1998 |
| Bob's Bar Ltd | Hospitality | 2023 |
| Bodypower Sport & Fitness International Ltd. | | 1992 |
| Bogeluxe Ltd | Other services | 2026 |
| Boiler Site Ltd | Construction | 2019 |
| Bold Mariner Ltd | Professional & scientific | 2024 |
| Bolts Pro Ltd | Wholesale & retail | 2025 |
| Bombay Cuisine Express Ltd | Hospitality | 2019 |
| Bonaventure Associates Limited | Professional & scientific | 2018 |
| Bondmark Investments Limited | Real estate | 2002 |
| Boon Construction Ltd | Construction | 2024 |