| Barkada Limited | Hospitality | 2025 |
| Barker Brooks Communications Limited | Information & communication | 2012 |
| Barker Proudlove Consulting Ltd | Real estate | 2026 |
| Barker Proudlove Limited | Real estate | 2010 |
| Barkercleaningservices Ltd | Administrative & support | 2023 |
| Barkerend Mill Ltd. | Real estate | 2017 |
| Barkers Well Enterprises Ltd | Wholesale & retail | 2020 |
| Barkers Well Lawn Limited | Administrative & support | 2026 |
| Barkisland Mill Residents' Management Company Limited | Households | 2000 |
| Barkley Prformance Ltd | Wholesale & retail | 2026 |
| Barkly Road Garage Ltd | Wholesale & retail | 2026 |
| Barkridge UK Ltd | Financial services | 2003 |
| Barkston Limited | Financial services | 2020 |
| Barkston Plastics (Newcastle) Limited | Manufacturing | 2005 |
| Barkston Plastics Engineering Limited | Manufacturing | 1973 |
| Barkston Plastics Forming Limited | Extraterritorial | 1991 |
| Barkston Plastics Ltd | Manufacturing | 1969 |
| Barksy Ltd | Information & communication | 2016 |
| Barley Piper Limited | Real estate | 2020 |
| Barleys Lets Limited | Real estate | 2021 |
| Barlow Andrews LLP | | 2009 |
| Barmac Asset Management Limited | Extraterritorial | 2004 |
| Barmaster (Independant Wholesalers) Limited | Wholesale & retail | 1999 |
| Barmston (Thorne) Limited | Construction | 2019 |
| Barmston Developments Limited | Construction | 2007 |
| Barna Bika Holdings | Other services | 2021 |
| Barnaby Stewart Executive Search Ltd | Professional & scientific | 2026 |
| Barnburgh Properties Limited | Real estate | 2004 |
| Barnco Developments Ltd | Real estate | 2019 |
| Barnes Bower Property Ltd | Construction | 2026 |
| Barnes Field Properties Limited | Real estate | 2016 |
| Barnet Lighting Services Limited | Administrative & support | 2005 |
| Barnett & Daughters Limited | Real estate | 2015 |
| Barnett Kicks Limited | Construction | 2014 |
| Barnie Group Ltd | Construction | 2023 |
| Barnsley Estates Partnership Limited | Real estate | 2003 |
| Barnsley Fundco 1 Limited | Real estate | 2003 |
| Barnsley Fundco 2 Limited | Construction | 2006 |
| Barnsley Fundco 3 Limited | Construction | 2009 |
| Barnsley Holdco One Limited | Construction | 2009 |
| Barnsley Holdco Three Limited | Construction | 2010 |
| Barnsley Holdco Two Limited | Construction | 2010 |
| Barnsley Local Education Partnership Limited | Construction | 2009 |
| Barnsley Partnership for Learning Limited | Construction | 2009 |
| Barnsley Partnership for Learning Three Limited | Construction | 2010 |
| Barnsley Partnership for Learning Two Limited | Construction | 2010 |
| Barnsley SPV One Limited | Construction | 2009 |
| Barnsley SPV Three Limited | Construction | 2010 |
| Barnsley SPV Two Limited | Construction | 2010 |
| Barnwood Investments Limited | Real estate | 2024 |
| Barok Air Conditioning Ltd | Energy | 2021 |
| Baron Mobile Furniture Repair Limited | Other services | 2025 |
| Baron Wenlock (Management Company) Limited | Real estate | 2008 |
| Barr Plant & Tool Hire Ltd | Administrative & support | 2023 |
| Barraclough Ltd | Construction | 2009 |
| Barratt Projects Limited | Construction | 2012 |
| Barrel Brothers Limited | Financial services | 2025 |
| Barrett & Barrett Consulting Limited | Information & communication | 2026 |
| Barrett Property Limited | Real estate | 2019 |
| Barrizee Ltd | Wholesale & retail | 2019 |
| Barron & Johnson Builders Ltd | Construction | 2021 |
| Barron Builders (Leeds) Limited | Construction | 2023 |
| Barrow Group Limited | Professional & scientific | 2021 |
| Barrow Trading Limited | Administrative & support | 2025 |
| Barrs & Co Agency Ltd | Other services | 2025 |
| Barrs & Co Ltd | Other services | 2014 |
| Barry Boydon (Leeds) Limited | Construction | 2002 |
| Barry Continental Enterprise Limited | Wholesale & retail | 2012 |
| Bars Pubs and Clubs Ltd | Hospitality | 2021 |
| Barterverse Limited | Information & communication | 2024 |
| Barthorpes Limited | Transport & logistics | 2012 |
| Bartlett & Company Limited | Financial services | 1940 |
| Bartlett & Stratford Rentals LLP | | 2018 |
| Bartlett Employee Benefits Limited | Professional & scientific | 2024 |
| Bartlett Group (Subsidiaries) Limited | Professional & scientific | 1996 |
| Bartlett Group Limited | Financial services | 1969 |
| Bartlett Trustee Limited | Financial services | 2003 |
| Bartlett Underwriting Limited | Financial services | 2025 |
| Bartlett Wealth Management Ltd | Financial services | 1965 |
| Bartley Capital Group Ltd | Financial services | 2026 |
| Bartley MAC Ltd | Real estate | 2018 |
| Barton Durrant Properties Limited | Households | 2017 |
| Barton Lane Management Company Limited | Extraterritorial | 2015 |
| Barton Legal Limited | Professional & scientific | 2012 |
| Barview Assets Limited | Administrative & support | 2013 |
| Barwick Electrical (Leeds) Limited | Construction | 2003 |
| Barwick Electrical Holdings Limited | Financial services | 2019 |
| Barwick Electrical Services Limited | Construction | 2011 |
| Barwick Holdings (Leeds) Limited | Financial services | 2024 |
| Barwick Maypole Trust | Arts & recreation | 2005 |
| Barwick Property Consultancy Ltd | Professional & scientific | 2023 |
| Barwick Self Storage Ltd | Transport & logistics | 2017 |
| Barwick Services Ltd | Hospitality | 2023 |
| Barwick Stores Ltd | Wholesale & retail | 2016 |
| BAS BIO Solutions Ltd | Administrative & support | 2026 |
| BAS Private Equity Limited | Real estate | 2019 |
| Bascos AD Ltd | Hospitality | 2020 |
| Base Beauty Salon Ltd | Other services | 2019 |
| Base Regen AG Co Ltd | Professional & scientific | 2023 |
| Based Group Ltd | Wholesale & retail | 2023 |