| Ayat Trading Limited | Wholesale & retail | 2020 |
| Ayaz Mart Ltd | Wholesale & retail | 2026 |
| Aymi Ltd | Wholesale & retail | 2025 |
| AYO Group Ltd | Information & communication | 2021 |
| AYP Limited | Manufacturing | 2006 |
| Ayra Collection Ltd | Wholesale & retail | 2026 |
| Ayres Engineering Ltd | Professional & scientific | 2020 |
| Ayrif Properties Limited | Real estate | 2024 |
| AZ Telecommunication Ltd | Other services | 2020 |
| Azeem Enterprises Limited | Wholesale & retail | 2026 |
| Azira Academy Ltd | Education | 2024 |
| Azira Aesthetics Limited | Health & social care | 2016 |
| B & a Plant Hire Limited | Administrative & support | 2018 |
| B & B Environmental Services Limited | Water & waste | 2013 |
| B & D Consultants Ltd | Administrative & support | 2017 |
| B & K Vaughan Limited | Financial services | 2019 |
| B & N (IOW) Investments Ltd | Real estate | 2024 |
| B and C Property Rentals Limited | Real estate | 2019 |
| B Ashton Building Contractors Limited | Construction | 2014 |
| B Becks Limited | Wholesale & retail | 2021 |
| B Childs Welding & Fabrication Ltd | Manufacturing | 2022 |
| B D Electrical IW Ltd | Construction | 2025 |
| B Luxe Estates Ltd | Real estate | 2026 |
| B Oatley Builders Ltd | Construction | 2026 |
| B Richards Roofing and Building Ltd | Construction | 2025 |
| B W Mooring Services Limited | Construction | 2013 |
| B&A Gasworks Ltd | Construction | 2025 |
| B&B Fresh Ways Ltd | Wholesale & retail | 2021 |
| B&E Houses Ltd | Real estate | 2025 |
| B&H Clearance Limited | Water & waste | 2008 |
| B&R Motor Repairs Ltd | Wholesale & retail | 2017 |
| B&S Promotions Limited | Arts & recreation | 2024 |
| B'S Aesthetics Limited | Health & social care | 2018 |
| B'Spoilt Limited | Other services | 2005 |
| B-Bikers Bristol Ltd | Education | 2026 |
| B-Tech Heating Ltd | Construction | 2017 |
| B. & T. Hicks (Transport) Limited | Transport & logistics | 1973 |
| B.C.D.L. Plastering Limited | Construction | 2005 |
| B.Fresh Foods LLP | | 2014 |
| B.G. Hicks Limited | Transport & logistics | 1973 |
| B.H Roofing Solutions Ltd | Construction | 2023 |
| B.R (SW) Ltd | Hospitality | 2015 |
| B10 Consultancy Ltd | Professional & scientific | 2023 |
| B2 Marketing Ltd | Professional & scientific | 2007 |
| B2CONSULT Ltd | Wholesale & retail | 2025 |
| B2SPACE Limited | Professional & scientific | 2016 |
| B4U Care Ltd | Health & social care | 2016 |
| B8N Ltd | Information & communication | 2025 |
| B:Wild Golf Ltd | Wholesale & retail | 2025 |
| BA Holdings and Investments Limited | Financial services | 2021 |
| Baam Enterprises Limited | Professional & scientific | 2024 |
| Baba Farid Ltd | Wholesale & retail | 2020 |
| Baba Ghanoush Limited | Hospitality | 2017 |
| Babi Hapi Ltd | Wholesale & retail | 2019 |
| Baby Face 4D Limited | Health & social care | 2018 |
| Baby Knits Ltd | Manufacturing | 2025 |
| Babyart Wales Limited | Professional & scientific | 2019 |
| Babybean Coffee Ltd | Wholesale & retail | 2022 |
| Babycrafts UK Limited | Wholesale & retail | 2020 |
| Backbone Projects Limited | Construction | 2017 |
| Backstage ADI Solutions Limited | Administrative & support | 2019 |
| Badbullies Ltd | Professional & scientific | 2020 |
| Badgeroo Limited | Information & communication | 2024 |
| Badgers Wood Close Management Company Limited | Households | 2008 |
| Badoc Construction Limited | Construction | 2007 |
| Badr Homes Ltd | Real estate | 2018 |
| Badz & Bears Events Limited | Administrative & support | 2025 |
| Bailey Creative Support Limited | Administrative & support | 2014 |
| Baird Consultancy Ltd | Professional & scientific | 2009 |
| Bajwadoc Limited | Health & social care | 2017 |
| Bake & Baraka Limited | Wholesale & retail | 2026 |
| Baker & Co Lettings Ltd | Real estate | 2025 |
| Baker Shepherd Gillespie LLP | | 2007 |
| Bakers Court (Binstead, Isle of Wight) Management Limited | Households | 1997 |
| Bal&Co Limited | Wholesale & retail | 2022 |
| Baldwin Locksmiths Ltd | Manufacturing | 2010 |
| Bale Cleaning Services Limited | Administrative & support | 2025 |
| Ball's Walls Limited | Real estate | 2022 |
| Ballanwood Motor Company Limited | Wholesale & retail | 2026 |
| Ballers (Lakeside) Ltd | Hospitality | 2023 |
| Balloon Support Services Limited | Administrative & support | 1991 |
| Balloons on Trend Ltd | Manufacturing | 2019 |
| Ballylemon EHS Ltd | Professional & scientific | 2026 |
| Baloua Limited | Health & social care | 2021 |
| Baltika Supermarket Newport Ltd | Wholesale & retail | 2023 |
| Bamboozled Bars UK Ltd | Hospitality | 2026 |
| Bambro Textiles Limited | Wholesale & retail | 2026 |
| Bana Restaurant Ltd | Hospitality | 2026 |
| Banah B3 Ltd | Education | 2026 |
| Bandy Rugby Ltd | Arts & recreation | 2014 |
| Bangin' Chicken Ltd | Hospitality | 2026 |
| Banks Agricultural Contractors Limited | Agriculture & fishing | 2004 |
| Banton’S Autos Ltd | Wholesale & retail | 2022 |
| BAP House Ltd | Hospitality | 2026 |
| Bar N Boujee Ltd | Hospitality | 2023 |
| Bar.Code Newport Ltd | Hospitality | 2024 |
| Barbquest Limited | Construction | 1973 |
| Barefoot Ceramics Limited | Arts & recreation | 2004 |
| Bargain Buys Limited | Wholesale & retail | 2014 |
| Bargainsdrcuk Ltd | Wholesale & retail | 2026 |