| Barakat Corporation Ltd | Real estate | 2025 |
| Barber's Garage Limited | Wholesale & retail | 2007 |
| Barberblacksheeplincoln Ltd | Other services | 2023 |
| Barbon Guarantor Limited | Administrative & support | 2026 |
| Barbon Holdings 2030 Limited | Financial services | 2010 |
| Barbon Insurance Group Limited | Financial services | 1995 |
| Barbon Legal Services Limited | Professional & scientific | 2022 |
| Bardney Investments Ltd | Manufacturing | 2009 |
| Barkers Civil Engineering Ltd | Construction | 2026 |
| Barkers Motors (Lincoln) Limited | Wholesale & retail | 2019 |
| Barleythorpe Investments Limited | Financial services | 2018 |
| Barlings KWA Limited | Construction | 2014 |
| Barnes and Sole Properties Ltd | Real estate | 2024 |
| Barney Cooper Limited | Real estate | 2023 |
| Barney's Churros Ltd | Hospitality | 2022 |
| Barneyracing Ltd | Arts & recreation | 2020 |
| Barney’S Dog Plod Ltd | Households | 2025 |
| Barns Day Nursery Limited | Education | 2012 |
| Barnsley Bowl Limited | Arts & recreation | 2002 |
| Barny's Property Projects Ltd | Construction | 2025 |
| Baron Arnold Associates Ltd | Health & social care | 2022 |
| Barr Medical Consulting Ltd | Health & social care | 2009 |
| Barrett Property Investments Ltd | Real estate | 2014 |
| Barrett's Coal Ltd | Wholesale & retail | 2021 |
| Barrier Depot Limited | Wholesale & retail | 2026 |
| Barrier Reef Limited | Wholesale & retail | 2021 |
| Barry Tavernier Limited | Administrative & support | 2011 |
| Bartle House Limited | Information & communication | 2010 |
| Bartle Property Limited | Real estate | 2017 |
| Barz and Pints Limited | Hospitality | 2017 |
| Base Artist Studios Ltd | Arts & recreation | 2026 |
| Basecamp Property Investments Limited | Real estate | 2023 |
| Baseline Flooring Ltd | Construction | 2024 |
| Basic HR Limited | Professional & scientific | 2019 |
| Basihope Limited | Health & social care | 2025 |
| Basp Ltd. | Other services | 2001 |
| Bass & Bingham Limited | Education | 2021 |
| Bass (Grimsby) Limited | Wholesale & retail | 2001 |
| Bass Electrical Limited | Manufacturing | 2007 |
| Bassettco Limited | Financial services | 2014 |
| Bassingham Investments Ltd | Financial services | 2024 |
| Bassingham Property Limited | Real estate | 2023 |
| Bassline Retail Ltd | Wholesale & retail | 2021 |
| Bassline Tennis Ltd | Education | 2017 |
| Batamber Limited | Hospitality | 1982 |
| Batchcon Ltd | Construction | 2023 |
| Bates Outdoors Ltd | Manufacturing | 2025 |
| Bates Sound Limited | Information & communication | 1990 |
| Bath Breast Surgery Ltd | Health & social care | 2012 |
| Bath Foot and Ankle Ltd | Health & social care | 2010 |
| Bath GI Surgery Ltd | Health & social care | 2014 |
| Bathroom Takeaway Ltd | Wholesale & retail | 2014 |
| Bathurst Motors Limited | Wholesale & retail | 2003 |
| Batribike Limited | Manufacturing | 2017 |
| Battle,Hayward and Bower,Limited | Wholesale & retail | 1933 |
| Battlerigs Media Ltd | Manufacturing | 2019 |
| Battles Limited | Professional & scientific | 2006 |
| Bauertech Instruments Limited | Manufacturing | 2009 |
| Baxter & Bushell Properties Limited | Real estate | 2015 |
| Baxter's Flooring Ltd | Construction | 2024 |
| Baybury Ltd | Professional & scientific | 2026 |
| Bayleaf (Cherry Willingham) Limited | Real estate | 2024 |
| Baysangur Ltd | Hospitality | 2026 |
| Bayswater Medical Ltd | Health & social care | 2022 |
| BB Properties Newark Ltd | Real estate | 2014 |
| BB Scaffolding Services Limited | Construction | 2006 |
| BB Support Services Ltd | Health & social care | 2019 |
| Bbaa Holdings Limited | Financial services | 2021 |
| BBD 1 Limited | Transport & logistics | 2024 |
| BBE Precision Limited | Manufacturing | 2000 |
| BBT Capital Limited | Administrative & support | 2016 |
| BC Couriers Ltd | Transport & logistics | 2022 |
| BC ITS Consulting Limited | Professional & scientific | 2023 |
| Bc.Wk Ltd | Professional & scientific | 2025 |
| BC4 Projects Ltd | Construction | 2023 |
| Bclv Limited | Wholesale & retail | 2015 |
| BCM Creations Ltd | Professional & scientific | 2025 |
| Bcpm Utilities Limited | Construction | 2012 |
| Bddn Ltd | Real estate | 2025 |
| BDF Civils & Groundworks Ltd | Construction | 2024 |
| Bdsk Consultancy Ltd | Administrative & support | 2026 |
| BE Construction Ltd | Construction | 2021 |
| BE Greater Than Ltd | Professional & scientific | 2019 |
| Beach House Lettings Ltd | Real estate | 2024 |
| Beaconuk Group Ltd | Wholesale & retail | 2021 |
| Beaconuk Investment Ltd | Financial services | 2021 |
| Beamtree UK Limited | Professional & scientific | 2021 |
| Beardshall Advisory Ltd | Professional & scientific | 2026 |
| Bearpark Group Ltd | Construction | 2019 |
| Beatoni Limited | Health & social care | 2011 |
| Beau & Brooke Ltd | Wholesale & retail | 2025 |
| Beaumont and Creane Management Limited | Households | 2021 |
| Beaumont and Creane Properties Ltd | Real estate | 2024 |
| Beaumonts Plumbing & Heating Ltd | Construction | 2014 |
| Beauty Evolution Ltd | Wholesale & retail | 2012 |
| Beauty Factory Lincoln Ltd | Other services | 2019 |
| Beauty Group Limited | Wholesale & retail | 2016 |
| Beauty Kingdom Academy Limited | Other services | 2021 |
| Beauty Secrets Clinic Ltd | Other services | 2021 |
| Bebisal Consulting Limited | Professional & scientific | 2022 |