| Ayjayen Ltd | Administrative & support | 2026 |
| AYN Consultancy Ltd | Information & communication | 2024 |
| AYS Property Ltd | Real estate | 2025 |
| Ayub Builds Ltd | Wholesale & retail | 2026 |
| Ayub Properties Ltd | Construction | 2023 |
| Ayura Designs Limited | Wholesale & retail | 2025 |
| AZ Salvage Cars Ltd | Wholesale & retail | 2023 |
| Azautoservices Ltd | Wholesale & retail | 2026 |
| AZS Properties Ltd | Real estate | 2023 |
| B & E Together Limited | Education | 2013 |
| B & F Developments Limited | Administrative & support | 2015 |
| B & W Beds Ltd | Wholesale & retail | 2022 |
| B - Pro Partitions & Ceilings Limited | Construction | 2016 |
| B B Henderson Limited | Real estate | 2014 |
| B Clarke Ltd | Real estate | 2025 |
| B N M Barbers Ltd | Other services | 2024 |
| B R GAS UK Ltd | Construction | 2007 |
| B T S Global Services Ltd | Administrative & support | 2025 |
| B Walker Plastering Limited | Construction | 2016 |
| B Watkins Enterprises Ltd | Professional & scientific | 2025 |
| B&D Botanicals Ltd | Administrative & support | 2025 |
| B&L Carpets and Vinyl Ltd | Construction | 2024 |
| B. and B.Press (Parkgate) Limited | Manufacturing | 1963 |
| B. Thornton & Sons Limited | Manufacturing | 2008 |
| B.A Security Solutions Limited | Administrative & support | 2023 |
| B.C Commercials Ltd | Wholesale & retail | 2025 |
| B28 Property Ltd | Real estate | 2025 |
| B2B Mind Ltd | Information & communication | 2015 |
| B2BINSIGHT Limited | Professional & scientific | 2009 |
| B2L Carpet Cleaning Ltd | Administrative & support | 2023 |
| BA Executive Ltd | Construction | 2015 |
| BA Hepworth Ltd | Professional & scientific | 2023 |
| Ba-Kro Ltd | Transport & logistics | 2021 |
| BA101 Ltd | Administrative & support | 2018 |
| Babycare Reach CIC | Education | 2025 |
| Baccus Management Limited | Real estate | 2002 |
| Bachhal Stores Limited | Wholesale & retail | 2025 |
| Back My Stitch UP Design Ltd | Wholesale & retail | 2023 |
| Back to Bricks Limited | Real estate | 2018 |
| Back&Back Ltd | Administrative & support | 2019 |
| Backactive Chiropractic Clinics | Health & social care | 2005 |
| Backstage Projects Ltd | Wholesale & retail | 2026 |
| Badsley Moor Ltd | Hospitality | 2020 |
| Bafana Limited | Health & social care | 2019 |
| Baggaley Financial Limited | Financial services | 2022 |
| Bagyas Properties Ltd | Real estate | 2025 |
| Bahar Travel S60 Ltd | Transport & logistics | 2026 |
| Bailey Estates Limited | Real estate | 1995 |
| Bailey Paul Homes Ltd | Construction | 2012 |
| Bailey Serviced Stays Ltd | Hospitality | 2025 |
| Bake & Butty Ltd | Wholesale & retail | 2025 |
| Bake.N.Butty (Kimberworth) Ltd | Hospitality | 2016 |
| Baked by Beth Ltd | Manufacturing | 2022 |
| Baker Stone Systems Limited | Administrative & support | 2010 |
| Bakersteel Holdings Ltd | Financial services | 2024 |
| Bakery Teams Limited | Real estate | 2026 |
| Bakes Beyond Cakes Ltd | Manufacturing | 2025 |
| Balby Car PRT Ltd | Wholesale & retail | 2019 |
| Balby Motors PT Ltd | Wholesale & retail | 2022 |
| Balde London Ltd. | Manufacturing | 2017 |
| Baldwin's Electrical & Security Limited | Construction | 2018 |
| Balkan and European Translation and Interpretation Services Ltd | Professional & scientific | 2022 |
| Ball Inn Limited | Hospitality | 2020 |
| Ballard Hall Management Company Limited | Administrative & support | 2012 |
| Balliante Bars Ltd | Hospitality | 2026 |
| Balliante Limited | Information & communication | 2020 |
| Balm Green Ltd | Hospitality | 2026 |
| Balmforth Transport Limited | Wholesale & retail | 1991 |
| Balog Spices Limited | Wholesale & retail | 2025 |
| Bandhart | Extraterritorial | 1980 |
| Bandhart Overseas | Professional & scientific | 1950 |
| Baobab Kitchens Ltd | Manufacturing | 2025 |
| Barber One Ltd | Other services | 2024 |
| Barberly Ltd | Health & social care | 2018 |
| Barbers & More Ltd | Other services | 2023 |
| Barbers Bathrooms and Kitchens (BBK) Ltd | Construction | 2026 |
| Barbers Property Developments Ltd | Real estate | 2026 |
| Barbu Daniel Ltd | Transport & logistics | 2017 |
| Barcelona-Shinkyowa Traders Limited | Wholesale & retail | 2022 |
| Bare Knuckle Sport Ltd | Arts & recreation | 2025 |
| Bare Muscle Official Ltd | Wholesale & retail | 2024 |
| Barefoot Physiotherapy Limited | Health & social care | 2016 |
| Barker Energy Limited | Professional & scientific | 2016 |
| Barker Physiotherapy Limited | Other services | 2012 |
| Barking Bulldogs Ltd | Other services | 2026 |
| Barmau Properties Limited | Real estate | 2024 |
| Barn Find Customs Ltd | Wholesale & retail | 2025 |
| Barnard Lettings Ltd | Real estate | 2024 |
| Barnes Property Solutions (Yorkshire) Ltd | Real estate | 2025 |
| Barnsley Account Ltd | Real estate | 2026 |
| Barnsley Enterprise Agency | Other services | 2001 |
| Barnsley Makers Limited | Other services | 2022 |
| Barrel & Bean Associates Limited | Hospitality | 2025 |
| Bartholomew and Sons (Maltby) Ltd | Other services | 2020 |
| Bartholomew and Sons Ltd | Other services | 2018 |
| Base Box Ltd | Hospitality | 2025 |
| Bash Style Barber Ltd | Other services | 2026 |
| Bassboat Limited | Information & communication | 2022 |
| Bast Maintenance Ltd | Administrative & support | 2016 |
| BAT Developments Ltd | Construction | 2017 |