| Barrel Rostery Ltd | Manufacturing | 2025 |
| Barrett Values Centre Limited | Administrative & support | 2001 |
| Barrfield Properties Ltd | Real estate | 2023 |
| Barrie Jones (Upholsterers) Limited | Manufacturing | 1978 |
| Barrie Newcombe Associates Limited | Professional & scientific | 2003 |
| Barrington Developments Ltd | Construction | 2011 |
| Barrington Properties NW Ltd | Real estate | 2018 |
| Barrington Shepherd Ltd | Professional & scientific | 2016 |
| Barrmade Limited | Hospitality | 2016 |
| Barron Orange Limited | Information & communication | 2013 |
| Barrow Commercial & Residential Ltd | Financial services | 2019 |
| Barrowell Holdings Ltd | Real estate | 2021 |
| Barrowford Property LLP | | 2005 |
| Barrowmix Limited | Construction | 2004 |
| Barrwood Logistical Services Ltd | Transport & logistics | 2018 |
| Barry Cullen Architecture Ltd | Professional & scientific | 2021 |
| Barry Grainger Limited | Financial services | 2000 |
| Barry OLA Limited | Health & social care | 2022 |
| Barry Raymond Ltd | Wholesale & retail | 2026 |
| Barry Sims Ltd | Wholesale & retail | 2025 |
| Barrys Furniture Limited | Wholesale & retail | 2014 |
| Barstowe Management Consultants Ltd | Real estate | 2019 |
| Bartek Steel Fixing Ltd | Construction | 2026 |
| Bartell Cottage Furnishings Limited | Other services | 1993 |
| Barter and Bargains Ltd | Wholesale & retail | 2024 |
| Bartnik Transport Limited | Transport & logistics | 2013 |
| Barton and Redman Limited | Wholesale & retail | 1964 |
| Barton Attwell Limited | Professional & scientific | 2025 |
| Barton Building and Construction Limited | Construction | 2011 |
| Barton Building Services Ltd | Construction | 2016 |
| Barton Diesel Services Limited | Transport & logistics | 1990 |
| Barton Fireplace & Stove Centre Ltd | Wholesale & retail | 2019 |
| Barton Huxley Management Ltd | Administrative & support | 2020 |
| Barton Kendal (Middleton) Ltd | Real estate | 2015 |
| Barton LEE Properties Ltd | Real estate | 2021 |
| Barton Properties N W Limited | Real estate | 1997 |
| Barton Property Services Limited | Real estate | 2025 |
| Barton Rouge Limited | Hospitality | 2010 |
| Barton Sheds and Fencing Ltd | Manufacturing | 2024 |
| Barton Street Management Company Limited | Households | 2003 |
| Barton Windows Limited | Manufacturing | 1986 |
| Bartons Real Estate Limited | Real estate | 2021 |
| Bartoz Transport Ltd. | Transport & logistics | 2017 |
| Baruamarketing Ltd | Professional & scientific | 2024 |
| Baruch Health Ltd | Health & social care | 2023 |
| Baryon Enterprises Ltd | Wholesale & retail | 2005 |
| Barzanji Ltd | Real estate | 2016 |
| Barzey-Francois Limited | Other services | 2012 |
| BAS KAR Limited | Real estate | 2016 |
| BAS Property Holdings Limited | Real estate | 2023 |
| BAS Superstore Limited | Wholesale & retail | 2024 |
| BAS Wagstaff Ltd | Manufacturing | 1970 |
| Basadi Bame Limited | Other services | 2024 |
| Basalt Engineering Consultancy Ltd | Professional & scientific | 2021 |
| Basateen Limited | Health & social care | 2025 |
| Basatin Alkhalij Almumayaza Ltd | Wholesale & retail | 2026 |
| Basbar Cafe Limited | Hospitality | 2025 |
| Bascomb & Drew Developments Ltd. | Construction | 2003 |
| Bascule Limited | Education | 2002 |
| Base & Birch Ltd | Professional & scientific | 2026 |
| Base Aura Limited | Wholesale & retail | 2012 |
| Base CMO Ltd | Professional & scientific | 2022 |
| Base Hair & Beauty (Whitefield) Limited | Other services | 2017 |
| Base Homecover Limited | Other services | 2021 |
| Base Interactive Ltd | | 2000 |
| Base Management Services Limited | Households | 2003 |
| Base MCR Ltd | Hospitality | 2017 |
| Base Metal Refining Ltd | Extraterritorial | 2014 |
| Base PVT Ltd | Administrative & support | 2025 |
| Base Security Ltd | Administrative & support | 2012 |
| Base-Five Limited | Professional & scientific | 2024 |
| Basehabit Ltd | Wholesale & retail | 2026 |
| Baselift Limited | Wholesale & retail | 2017 |
| Baseline IT Solutions Limited | Information & communication | 2024 |
| Baseline Wellness Limited | Wholesale & retail | 2026 |
| Baselines Limited | Professional & scientific | 2008 |
| Basem Mohamed Saeid Jafli for Trading Ltd | Wholesale & retail | 2024 |
| Basements North West Limited | Construction | 2016 |
| Basets Limited | Wholesale & retail | 2013 |
| Bashasha Ltd | Wholesale & retail | 2024 |
| Bashayer Al-Khayr Ltd | Wholesale & retail | 2025 |
| Bashayer Alkher Ltd | Wholesale & retail | 2025 |
| Bashe Limited | Professional & scientific | 2025 |
| Basheer Abdo Noman Al-Hubaishi Company Ltd | Wholesale & retail | 2025 |
| Basheer Occupational Health Ltd | Health & social care | 2011 |
| Basic Inc Limited | Professional & scientific | 2014 |
| Basic INK Cosmetics Ltd | Administrative & support | 2019 |
| Basic Welding Services Limited | Professional & scientific | 1997 |
| Basics UK Academy Limited | Education | 2024 |
| Basilee Ltd | Wholesale & retail | 2026 |
| Basileia Capital Limited | Wholesale & retail | 2026 |
| Basill & Yonas Limited | Wholesale & retail | 2024 |
| Basina Ltd | Hospitality | 2025 |
| Basingden Limited | Wholesale & retail | 1988 |
| Basino Ltd | Professional & scientific | 2025 |
| Basit Enterprises Limited | Manufacturing | 2023 |
| Basit Group Limited | Real estate | 2023 |
| Basit Knitwear Limited | Manufacturing | 2008 |
| BASKET2DOOR Ltd | Wholesale & retail | 2024 |
| Basketball England | Arts & recreation | 1979 |