| Barkers Plastering Systems Ltd | Construction | 2016 |
| Barking Kebabish Ltd | Hospitality | 2019 |
| Barklie Pet Accessories Limited | Wholesale & retail | 2025 |
| Barlow Park Limited | Manufacturing | 2018 |
| Barlow Woodseats Restaurant Limited | Hospitality | 2021 |
| Barmik Properties Limited | Real estate | 1964 |
| Barn Oak Developments Limited | Construction | 2017 |
| Barn the Spoon Ltd | Manufacturing | 2017 |
| Barndale Blinds and Interiors Ltd | Manufacturing | 2019 |
| Barnes Green Investments Limited | Real estate | 2006 |
| Barnes Green Landscapes Limited | Administrative & support | 2003 |
| Barnes Green Riding School Limited | Arts & recreation | 2002 |
| Barnett Analytics Ltd | Professional & scientific | 2025 |
| Barnett Wealth Management Limited | Professional & scientific | 2014 |
| Barnfield Garage (Hathersage) Ltd | Wholesale & retail | 2015 |
| Barnhaus Design Limited | Construction | 2025 |
| Barnsley Catering Services Limited | Construction | 1979 |
| Barnsley Food and Wine Limited | Wholesale & retail | 2012 |
| Barnsley Glass & Glazing Limited | Manufacturing | 2000 |
| Barnsley Lifting Services Limited | Other services | 2009 |
| Barnsley Road Valeting Centre Limited | Administrative & support | 2025 |
| Baronsmere Holdings Ltd | Wholesale & retail | 2026 |
| Barra Organics Limited | Wholesale & retail | 2013 |
| Barracuda (UK) Services Limited | Hospitality | 2012 |
| Barrel & Anvil Sheff Ltd | Wholesale & retail | 2026 |
| Barrel Organ Ltd | Arts & recreation | 2016 |
| Barrelnook Consulting Ltd | Professional & scientific | 2017 |
| Barrels of Life Ltd | Administrative & support | 2024 |
| Barrex Ltd | Manufacturing | 2018 |
| Barrio Ltd | Hospitality | 2024 |
| Barround Finance Limited | Financial services | 1964 |
| Barrow Bouldering Ltd | Arts & recreation | 2025 |
| Barrow Construction Ltd | Construction | 2026 |
| Barrow Field Trading Limited | Wholesale & retail | 2025 |
| Barrow Healthcare Ltd | Wholesale & retail | 2023 |
| Barry Adamson Limited | Information & communication | 2018 |
| Barry's Electricals and Plumbing Ltd | Other services | 2017 |
| Bartlett Family Law Ltd | Professional & scientific | 2022 |
| Barton BID Management Limited | Professional & scientific | 2021 |
| Bartram Motors Limited | Wholesale & retail | 2018 |
| Barugh Green Residents Limited | Households | 2008 |
| BAS Planning Ltd | Professional & scientific | 2024 |
| Base M&E Ltd | Professional & scientific | 2021 |
| BASE147 Enterprise Limited | Professional & scientific | 2020 |
| Basechan Properties Ltd | Hospitality | 2025 |
| Baseheat Underfloor Heating Ltd | Construction | 2015 |
| Baseline Kids Ltd | Health & social care | 2024 |
| Basement Dreams Ltd | Construction | 2025 |
| Basepizzaco Ltd | Hospitality | 2019 |
| Basespace Limited | Construction | 2013 |
| Bashur Travel Limited | Financial services | 2025 |
| Basia Enterprises Ltd | Transport & logistics | 2017 |
| Basilica Property Ltd | Real estate | 2021 |
| Basilthanoon Medical Services Limited | Health & social care | 2025 |
| Baskerville's Transport Ltd | Transport & logistics | 2014 |
| Baskiny Tech Group Ltd | Information & communication | 2025 |
| Baslow Insurance Services Holding Company Limited | Financial services | 2007 |
| Basra Cafe Lounge Limited | Hospitality | 2025 |
| Bassledene Road Management Company Limited | Households | 2020 |
| Bassoff Events Ltd | Arts & recreation | 2025 |
| Basti Restaurant & Catering Ltd | Hospitality | 2026 |
| Basura (International) Ltd | Water & waste | 2018 |
| Bas£Ment Ltd | Hospitality | 2026 |
| BAT MOH Limited | Wholesale & retail | 2020 |
| Batana UK Limited | Wholesale & retail | 2025 |
| Batch Burgers Ltd | Hospitality | 2021 |
| Bates Stewart (2018) Ltd | Information & communication | 2018 |
| Bathroom Wall Panels Ltd | Wholesale & retail | 2025 |
| Batom Services Ltd | Health & social care | 2015 |
| Batter Bay Ltd | Hospitality | 2025 |
| Batter Bros Ltd | Hospitality | 2025 |
| Battersby Broadcast Acoustic Solutions Ltd | Information & communication | 2014 |
| Baturn Limited | | 1988 |
| Baty International Limited | Manufacturing | 1943 |
| Bauer Grant Contracts Ltd | Energy | 2018 |
| Bauhinia Coaching & Consulting Ltd | Professional & scientific | 2021 |
| Baulk Lane Ltd | Real estate | 2025 |
| Bavastro Hospitality Limited | Hospitality | 2024 |
| Bavi Motors (UK) Limited | Wholesale & retail | 2023 |
| Bavong Ltd | Administrative & support | 2016 |
| Baxtech Ltd | Professional & scientific | 2017 |
| Baxter & Beagle Holdings Limited | Financial services | 2024 |
| Baxter & Beagle Properties Limited | Real estate | 2024 |
| Baxter Holdings Ltd | Real estate | 2024 |
| Baxter S6 Limited | Construction | 2014 |
| Baxters Retail Stores Limited | Wholesale & retail | 2008 |
| Bay of Bengal (UK) Limited | Hospitality | 2014 |
| Baya Active Limited | Wholesale & retail | 2025 |
| Bayflash Limited | Professional & scientific | 2014 |
| Bayps Technologies UK Ltd | Professional & scientific | 2004 |
| Bayram 23 Ltd | Hospitality | 2020 |
| Baysie GAS UK Ltd | Construction | 2016 |
| Bayston White Limited | Administrative & support | 2018 |
| Bayt AL Coffee Ltd | Hospitality | 2026 |
| Bayview Connect Limited | Real estate | 2022 |
| Bayzan Barber Limited | Other services | 2024 |
| Bayzee Ltd | Transport & logistics | 2023 |
| BAZ Airsoft Ltd | Manufacturing | 2023 |
| BB Daycare Ltd | Extraterritorial | 2015 |
| BB Detailing Group Ltd | Wholesale & retail | 2025 |