| B Facades Ltd | Construction | 2025 |
| B Griff UK Limited | Manufacturing | 2019 |
| B H T Building Consultancy Ltd | Real estate | 2022 |
| B S Builders (Yorkshire) Limited | Construction | 2023 |
| B.L.P.Cyp Limited | Other services | 2025 |
| B2B Supply Ltd | Wholesale & retail | 2023 |
| BAA Move Ltd | Real estate | 2015 |
| Baaz Sameday Ltd | Transport & logistics | 2022 |
| Baby Ginge Ltd | Wholesale & retail | 2024 |
| Back on Track Sports Rehab Ltd | Health & social care | 2025 |
| Back Your Club Ltd | Information & communication | 2026 |
| Bankhouse Datacommunications Limited | Information & communication | 2000 |
| BAO BOY Industries Limited | Hospitality | 2023 |
| Barassie Engineering Systems Ltd | Construction | 2020 |
| Barassie Limited | Manufacturing | 2009 |
| Barber Harrison & Platt Debt Advisory LLP | | 2012 |
| Barghest Properties Ltd | Hospitality | 2026 |
| Bark and Blossom Ltd | Other services | 2026 |
| Barlow's Housing Limited | Real estate | 2021 |
| Barron Furniture Ltd | Manufacturing | 2022 |
| Basement (Yorkshire) Limited | Financial services | 2026 |
| Basement Structures Limited | Construction | 2018 |
| Batata Studios Ltd | Information & communication | 2025 |
| Bawtrys Bar 23 Ltd | Hospitality | 2023 |
| BD Sales Consultancy Limited | Professional & scientific | 2022 |
| BD Surveying UK Ltd | Administrative & support | 2017 |
| Beach Court Holiday Apartments Ltd | Real estate | 2022 |
| Beardog Enterprises Ltd | Extraterritorial | 1994 |
| Beardsworth's Limited | Agriculture & fishing | 1980 |
| Beckshaw Properties Limited | Real estate | 1998 |
| Bedroomware Limited | Wholesale & retail | 2025 |
| Beech Street Properties Ltd | Real estate | 2025 |
| Beegroup (Yorkshire) Limited | Manufacturing | 2020 |
| Beerheadz Limited | Hospitality | 2016 |
| Begum Investment Limited | Financial services | 2025 |
| Bell UK Communications Limited | Information & communication | 2017 |
| Belladex Property Holdings Ltd | Real estate | 2026 |
| Belle Lingerie Limited | Wholesale & retail | 2005 |
| Bellmoore Limited | Real estate | 2023 |
| Benema Automotive Upholstery Ltd | Wholesale & retail | 2024 |
| Benjamin Howells Ltd | Transport & logistics | 2012 |
| Benjamin IT Communications Limited | Information & communication | 2022 |
| Benzema Ltd | Hospitality | 2023 |
| Berkolen Ltd | Other services | 2021 |
| Berwick Speedway Promotions Limited | Arts & recreation | 2018 |
| Best Smoker Korner Limited | Wholesale & retail | 2025 |
| Bextec IT Design Services Limited | Information & communication | 2019 |
| Beyond Kitchens Bathrooms and Extensions Ltd | Construction | 2022 |
| Bhbf Limited | Hospitality | 2025 |
| Big Daddy's Wicker Ltd | Hospitality | 2022 |
| Big GUS Sales & Lettings Limited | Real estate | 2015 |
| Binarybods Ltd | Professional & scientific | 2016 |
| Birdie's (PVT) Ltd | Hospitality | 2025 |
| Birstall Mill Carpets Limited | Wholesale & retail | 2002 |
| BL Test Consultancy Ltd | Information & communication | 2018 |
| Black Bull (Birstall) Limited | Hospitality | 2012 |
| Black Dalmatian Ltd | Real estate | 2025 |
| Blackwater (North East) Ltd. | Water & waste | 2009 |
| Blincht Housing Ltd | Real estate | 2024 |
| BLK Property Investments Ltd | Real estate | 2024 |
| Blossom Hair and Beauty Professionals Ltd | Other services | 2022 |
| Blue Eagle Carpenters Ltd | Construction | 2024 |
| Blue Furniture Ltd | Manufacturing | 2019 |
| Blue Sky Industries EEC Ltd | Wholesale & retail | 2015 |
| BN & Lord Muck Skips Limited | Water & waste | 2021 |
| Board of Angels Ltd | Extraterritorial | 2016 |
| Bolt on Bits Limited | Manufacturing | 2005 |
| Bond Developments (JV) Ltd | Construction | 2024 |
| Bond Street Associates Limited | Professional & scientific | 1988 |
| Border Technologies EOT Ltd | Professional & scientific | 2024 |
| Border Technologies Limited | Manufacturing | 1975 |
| Border Textiles (U.K.) Limited | Professional & scientific | 2006 |
| Boskett & Boskett Limited | Administrative & support | 2017 |
| Boulton Haulage Limited | Transport & logistics | 2007 |
| Box Tree Properties Limited | Real estate | 2025 |
| BP Land Limited | Construction | 2019 |
| Brackenridge Hanson Tate Holdings Ltd | Financial services | 2026 |
| Bradford Breakthrough Limited | Other services | 1989 |
| Bradford Camera Exchange Co.Limited | Wholesale & retail | 1937 |
| Bradford Junk & Rubbish Limited | Water & waste | 2020 |
| Bradley Rouse Contractors Limited | Construction | 2019 |
| Bramhaw Properties Limited | Construction | 2019 |
| Bramhaw Rentals Limited | Construction | 2025 |
| Brantingham Property Services Limited | Construction | 1998 |
| Breeze Craft Beds Limited | Manufacturing | 2019 |
| Brierdene Building Company Ltd | Construction | 2021 |
| Bris-Co Developments Ltd | Construction | 2023 |
| Brit Gold London Limited | Manufacturing | 2021 |
| Broadbents Department Store Limited | Wholesale & retail | 2021 |
| Broadleaf Contracting Yorkshire Limited | Construction | 2023 |
| Bronson Skip Hire Limited | Administrative & support | 2025 |
| Brotherhood Barbershop Ltd | Other services | 2024 |
| Brown Retail Holdings Limited | Other services | 2018 |
| Bruno's Pizzeria Limited | Hospitality | 2018 |
| Brunsdale Limited | Construction | 1998 |
| Bruski & Bunns Limited | Wholesale & retail | 2020 |
| BSM Energy Limited | Construction | 2024 |
| Bucktrout Limited | Professional & scientific | 2020 |
| Buditek Limited | Information & communication | 2016 |
| Bueno B Ltd | Professional & scientific | 2025 |