| Avebrook Limited | Professional & scientific | 2010 |
| Avellino Care Ltd | Health & social care | 2023 |
| Avoir Solutions Limited | Information & communication | 2013 |
| AW Building Ltd | Construction | 2007 |
| AWA Electrical Services Limited | Construction | 2021 |
| AWB Commercial Projects Limited | Construction | 2022 |
| Awning Ace Limited | Wholesale & retail | 2017 |
| AWS Social Housing CIC | Health & social care | 2025 |
| Axiombyte Ltd | Wholesale & retail | 2023 |
| Axis Holdings & Lettings Ltd | Real estate | 2022 |
| Axis Residential Care Solutions Ltd | Health & social care | 2022 |
| Aydan Spice Limited | Hospitality | 2019 |
| AYM Commercial Property Ltd | Real estate | 2023 |
| AYM Trading Ltd | Professional & scientific | 2022 |
| Azaazel Ltd | Administrative & support | 2026 |
| Azure Coaching Ltd | Information & communication | 2017 |
| B & B Shutters & Maintenance Limited | Manufacturing | 2006 |
| B & M Automatics Limited | Arts & recreation | 1959 |
| B & M LEE Plumbing and Heating Limited | Construction | 2013 |
| B & P Decorators LLP | | 2007 |
| B & W Vehicle Solutions (Midlands) Limited | Wholesale & retail | 2012 |
| B J Fencing Supplies Limited | Manufacturing | 2021 |
| B S (Coatbridge) Properties Limited | Real estate | 2015 |
| B.M. Accountancy Limited | Professional & scientific | 2004 |
| B.Ur.Roofer Ltd | Construction | 2022 |
| Backyard Enterprises Limited | Hospitality | 2018 |
| Baer Training Ltd | Education | 2026 |
| BAG a Bargain Limited | Wholesale & retail | 2020 |
| Bailey Carpentry Limited | Administrative & support | 2017 |
| Baileys Shooting Ltd | Wholesale & retail | 2023 |
| Bains Optical Healthcare Limited | Health & social care | 2015 |
| Bains Pharmacy Ltd | Health & social care | 2002 |
| Bains Trading Limited | Health & social care | 2025 |
| Bakeaway Staffordshire Limited | Manufacturing | 2017 |
| Baked @ NO 3 Limited | Manufacturing | 2014 |
| Baker and Joiner Limited | Construction | 1978 |
| Baker BM Limited | Manufacturing | 2014 |
| Baker Distribution & Stockholdings Ltd | Transport & logistics | 2019 |
| BAL Real Estate & Development Limited | Real estate | 2023 |
| Ballance & Lowbridge LLP | | 2002 |
| Ballooniverse - Balloons by Mands Ltd | Arts & recreation | 2024 |
| Baltic LS Enterprise Limited | Real estate | 2018 |
| Bane Farm Limited | Agriculture & fishing | 2026 |
| Bangor Construction Limited | Construction | 2022 |
| Banisters Super Green Limited | Health & social care | 2018 |
| Bankruptboyz Limited | Wholesale & retail | 2025 |
| Bar Sport Management Ltd | Hospitality | 2024 |
| Bargainblitz Ltd | Wholesale & retail | 2021 |
| Bargainboyz Ltd | Wholesale & retail | 2026 |
| Barnes Partitioning Limited | Construction | 2017 |
| Barnett’S of Britain Ltd | Wholesale & retail | 2017 |
| Barnhurst Revamps Ltd | Construction | 2025 |
| Barrington Security Elite Ltd | Financial services | 2025 |
| BAT EV Fire Safety Ltd | Professional & scientific | 2025 |
| BAT Fabrications Limited | Manufacturing | 2013 |
| Batey's Ceilings and Partitions Limited | Construction | 2021 |
| Bathrooms and Heating Limited | Construction | 2021 |
| Battery Supplies Ltd | Wholesale & retail | 2022 |
| Bay Custom Drums Limited | Manufacturing | 2014 |
| Bay Custom Studios Limited | Information & communication | 2024 |
| Bb's Boutique Limited | Wholesale & retail | 2021 |
| Bb's Buys Ltd | Wholesale & retail | 2024 |
| BBC Electrical Wholesalers (Midlands) Limited | Wholesale & retail | 2020 |
| BBF UK Ltd | Professional & scientific | 2021 |
| Bbrr Ltd | Construction | 2020 |
| Bci-Automotive Ltd | Manufacturing | 2017 |
| Bdgr Holdings Ltd | Financial services | 2025 |
| BDX Enterprises Limited | Financial services | 2025 |
| BE Finance Limited | Financial services | 2013 |
| Beacon Design & Engineering Limited | Manufacturing | 1998 |
| Beamzone Ltd | Wholesale & retail | 2025 |
| Beanie BOY Apparel Limited | Wholesale & retail | 2022 |
| Bear Trans Limited | Transport & logistics | 2015 |
| Bears Wardrobe Ltd | Wholesale & retail | 2022 |
| Bearwood Services Limited | Professional & scientific | 2019 |
| Beau Desert Golf Club Limited(The) | Arts & recreation | 1921 |
| Beauticat Limited | Other services | 2003 |
| Beckelec Engineered Solutions Ltd | Construction | 2021 |
| BED & Mattress Factory Outlet Limited | Wholesale & retail | 2020 |
| BEE Construction Recruitment Ltd | Construction | 2019 |
| BEE Smart Gardening Services Ltd | Arts & recreation | 2024 |
| BEE Sure Property Developers Limited | Construction | 2024 |
| Belina Industries LLP | | 2025 |
| Bella Amour Prom Ltd | Wholesale & retail | 2026 |
| Bellpep Limited | Wholesale & retail | 2013 |
| Bells Meat Wholesale Ltd | Hospitality | 2019 |
| BEN Basil Buff N Go Ltd | Administrative & support | 2025 |
| Benbow Carpentry Limited | Construction | 2024 |
| Bentleigh Antiques Ltd | Wholesale & retail | 2023 |
| Benussi Sales Limited | Other services | 2015 |
| Benussi Skimmers Limited | Other services | 2015 |
| Bespoke Civils Solutions Limited | Administrative & support | 2012 |
| Bespoke Electrical Contracts Ltd | Manufacturing | 2023 |
| Best 88 Limited | Hospitality | 2026 |
| Best Body Bootcamp Limited | Other services | 2019 |
| Best Facilities Ltd | Construction | 2025 |
| Beta Gaming Ltd | Wholesale & retail | 2022 |
| Beta Trans and Logistics Limited | Transport & logistics | 2025 |
| Betaglen Limited | Arts & recreation | 1982 |
| Better Care Services Ltd | Administrative & support | 2021 |