| Avant Prime Limited | Wholesale & retail | 2006 |
| Avanth Limited | Information & communication | 2025 |
| Avinoor Limited | Wholesale & retail | 2025 |
| AVL Management Services Ltd | Transport & logistics | 2015 |
| AVR Property Ltd | Real estate | 2023 |
| AW Safety 1 Limited | Professional & scientific | 2023 |
| AW Safety 3 Limited | Professional & scientific | 2023 |
| AW Safety 4 Limited | Professional & scientific | 2023 |
| AW Safety 5 Ltd | Real estate | 2025 |
| AW Safety Holdings Limited | Financial services | 2023 |
| AW Safety Management Limited | Professional & scientific | 2009 |
| Axiom Contracting and Business Developments Ltd | Professional & scientific | 2025 |
| Axtow Cleaning Solutions Ltd | Manufacturing | 2023 |
| Axtow Construction Ltd | Construction | 2024 |
| AY JAY Company Mansfield Limited | Wholesale & retail | 2023 |
| Ayaan News Ltd | Wholesale & retail | 2019 |
| Ayup Dog Ltd | Wholesale & retail | 2022 |
| Ayuslee Ltd | Transport & logistics | 2025 |
| AYW Football Coaching CIC | Education | 2022 |
| AZ Genuine Cosmetics Ltd | Wholesale & retail | 2021 |
| AZA Barbers Group Limited | Other services | 2024 |
| Azad Burger Ltd | Hospitality | 2025 |
| AZO Transport Ltd | Transport & logistics | 2025 |
| Azure Media Group Ltd | Information & communication | 2020 |
| B & D Investments Ltd | Real estate | 2014 |
| B & J Parr (Reclaimers) Limited | Water & waste | 1980 |
| B & M Tyres & Exhausts Limited | Extraterritorial | 2002 |
| B & R Webster Automobile Engineers Limited | Wholesale & retail | 2015 |
| B a Architecture Limited | Professional & scientific | 2023 |
| B D C Consultancy & Accountants Limited | Professional & scientific | 2016 |
| B Hinchliffe Electrical Contractors Ltd | Construction | 2025 |
| B M B Construction & Property Management Limited | Construction | 2018 |
| B Safe Fire Limited | Construction | 2025 |
| B W Bespoke Joinery Limited | Construction | 2015 |
| B&B Machinery Ltd | Wholesale & retail | 2022 |
| B&B Tractors Ltd | Wholesale & retail | 2022 |
| B&R Solar Services Ltd | Administrative & support | 2022 |
| B-Movie Limited | Information & communication | 2023 |
| B. Jephson (Mansfield) Limited | Households | 1975 |
| B. K. DOM Management Consultants Limited | Professional & scientific | 2023 |
| B.& D.Burtt Limited | Administrative & support | 1954 |
| B.A. Creative Limited | Other services | 2025 |
| B.H. Repairs Limited | Manufacturing | 2003 |
| B1 Home Invest Ltd | Real estate | 2020 |
| B3 Laundry and Cleaning Services Ltd | Administrative & support | 2025 |
| Baas Glorious Ltd | Wholesale & retail | 2026 |
| Babushkauk Limited | Wholesale & retail | 2010 |
| Babyluv Limited | Wholesale & retail | 2019 |
| Bader Geo-Consultancy Limited | Extraterritorial | 2011 |
| Badgerdogs Ltd | Hospitality | 2022 |
| Bagri Property Limited | Real estate | 2025 |
| BAI Building Services Limited | Construction | 2018 |
| BAI Fire and Security Limited | Administrative & support | 2014 |
| Baileys RAW Ltd | Manufacturing | 2025 |
| Baileysbuysuk Ltd | Wholesale & retail | 2025 |
| Bainspark Ltd | Hospitality | 2018 |
| Bairwell Ltd | Information & communication | 2008 |
| BAK 21 Limited | Wholesale & retail | 2025 |
| Bakers Steel Services Ltd | Manufacturing | 2021 |
| Balance & Motion Massage Ltd | Other services | 2025 |
| Balbinka Mini Market Ltd | Wholesale & retail | 2024 |
| Baldwin Business Consulting Ltd | Professional & scientific | 2019 |
| Ball and Sons Limited | Construction | 2011 |
| Ballbuild Ltd | Construction | 2026 |
| Balmoral Flat Roofing Limited | Construction | 2010 |
| Baltic Properties Ltd | Real estate | 2023 |
| Baltic Services Group Ltd | Other services | 2024 |
| Bama Foods Limited | Manufacturing | 2023 |
| Bancroft Home Limited | Health & social care | 2003 |
| Band Merchandise Ltd | Administrative & support | 2025 |
| Barber Shop Sound (Midlands) Ltd | Other services | 2026 |
| Barber Shop Sound Ltd | Other services | 2023 |
| Bark&Stride Ltd | Other services | 2026 |
| Barkley Estates Limited | Extraterritorial | 2016 |
| Barnabas Driveways and Patios Ltd | Administrative & support | 2025 |
| Barnabas Roofing Ltd | Construction | 2024 |
| Barnett & Turner Accountants Ltd | Professional & scientific | 2014 |
| Barnett & Turner LLP | | 2011 |
| Barnhill Couriers Limited | Transport & logistics | 2024 |
| Barnsley Bate Holdings Limited | Financial services | 2024 |
| Barracuda Fish Bar Limited | Hospitality | 2018 |
| Barracuda Mansfield Limited | Hospitality | 2022 |
| Barrel Micro PUB Ltd | Hospitality | 2024 |
| Barrowby Property Limited | Real estate | 2025 |
| Bart's Medical Services Ltd | Health & social care | 2021 |
| Barthorpe Properties Ltd | Real estate | 2026 |
| Barton HR Services Limited | Administrative & support | 2020 |
| Barts Property Investments Ltd | Real estate | 2023 |
| Barzell Properties Limited | Construction | 1969 |
| Base 10 Events Ltd | Arts & recreation | 2022 |
| Basrt Ltd | Financial services | 2023 |
| Bathroom Warehouse (Midlands) Limited | Wholesale & retail | 2000 |
| Baunton Ltd | Administrative & support | 2022 |
| Bawzi Group Limited | Other services | 2019 |
| Baxham Homes Ltd | Construction | 2024 |
| Baywater Consulting Ltd | Information & communication | 2023 |
| BB Brothers Derby Limited | Transport & logistics | 2025 |
| BBC Mansfield Leisure Limited | Hospitality | 2024 |
| Bbjp Holdings Ltd | Financial services | 2020 |
| BBL Construction Grop Ltd | Manufacturing | 2024 |