| Ashwood Premier House Limited | Agriculture & fishing | 2013 |
| Aslams Estates Ltd | Real estate | 2024 |
| Assess to Improve Ltd | Public administration | 2024 |
| Astute Rail Services Ltd | Construction | 2020 |
| Athlas Capital Ltd | Information & communication | 2025 |
| Aurora Paws Ltd | Wholesale & retail | 2022 |
| Auto Haus Carbon Ltd | Wholesale & retail | 2025 |
| Auto Plas Recycling Limited | Water & waste | 2009 |
| Autoleks Automotive Solutions Ltd | Information & communication | 2025 |
| Automotive Selling Ltd | Wholesale & retail | 2025 |
| AWM Joinery Ltd | Construction | 2014 |
| B & M (Ossett) Limited | Wholesale & retail | 2016 |
| B & P Rhodes Limited | Wholesale & retail | 2007 |
| B.B.R. Graphic Engineers (Yorkshire) Limited | Manufacturing | 1983 |
| B.J.S. Building and Joinery Limited | Construction | 2018 |
| BA Norfolk Properties Ltd | Real estate | 2022 |
| Babylon Pizzeria Ltd | Hospitality | 2024 |
| Back of the NET - Softplay Ltd | Health & social care | 2025 |
| Back of the NET - Wakefield Ltd | Hospitality | 2025 |
| Back of the NET Communities CIC | Education | 2026 |
| Bags 4 Everything Limited | Manufacturing | 2014 |
| Bargain NOW Ltd | Wholesale & retail | 2020 |
| Barnsley Roofing Supplies Limited | Extraterritorial | 2024 |
| Barras & SON Ltd | Real estate | 2022 |
| Barrique Fine Wines Ltd | Wholesale & retail | 2020 |
| Bash Build Limited | Financial services | 2022 |
| Bathroom Depot Ltd | Wholesale & retail | 2000 |
| Baxter Properties (Yorkshire) Ltd | Real estate | 2022 |
| BBD Property Ltd | Real estate | 2025 |
| BCB Glazing Ltd | Construction | 2022 |
| BE Real Ltd | Information & communication | 2025 |
| BEE Jays Electrical Wholesalers Limited | Construction | 1985 |
| Bees Knees IT Limited | Information & communication | 2019 |
| Belgrave WF5 Management Company Limited | Households | 2025 |
| Bella Jules Beauty, Aesthetics and Training Ltd | Other services | 2023 |
| Belle Amie Salon Limited | Other services | 2014 |
| Belle Hair & Beauty Academy Ltd | Other services | 2020 |
| Belle Royd Investments Limited | Real estate | 2020 |
| Belle Royd Services Limited | Other services | 2020 |
| Bench GAS Services Limited | Construction | 2021 |
| Bennett Property Solutions Limited | Real estate | 2009 |
| Bespoke Rugs Limited | Wholesale & retail | 2020 |
| Best Kebab Ossett Ltd | Hospitality | 2016 |
| Betham Global Ltd | Professional & scientific | 2020 |
| BI Jove Ltd | Information & communication | 2022 |
| BI Jove Reloaded Limited | Information & communication | 2026 |
| Bibi Publishing Ltd | Wholesale & retail | 2024 |
| Big Tom's Little Adventures Ltd | Information & communication | 2025 |
| Bigger Savings Ltd | Wholesale & retail | 2008 |
| Birthprep Limited | Extraterritorial | 2010 |
| BJD Electrical (Yorkshire) Ltd | Construction | 2026 |
| BL Automotive Solutions Limited | Wholesale & retail | 2020 |
| Blackwood Contracts Ltd | Professional & scientific | 2007 |
| Bladezs Barbers Ltd | Other services | 2022 |
| Blake Steel Services Limited | Construction | 2011 |
| Blubeck Limited | Wholesale & retail | 2003 |
| Bluebelle Financial Planning Ltd | Professional & scientific | 2021 |
| Blumotion Ltd | Transport & logistics | 2024 |
| BMC Power Limited | Construction | 2018 |
| Boiler & Bathroom Company Ltd | Construction | 2022 |
| Booths Carpets and Furnishings Limited | Wholesale & retail | 2026 |
| Bootique Ltd | Real estate | 2020 |
| Bootland Group Holdings Ltd | Financial services | 2019 |
| Bootland Property Investments Limited | Real estate | 2002 |
| Boston Motor Group Ltd | Wholesale & retail | 2026 |
| Boutique Coastal Escapes Limited | Hospitality | 2026 |
| Bpavel Company Ltd | Wholesale & retail | 2025 |
| Bradford Brothers Limited | Wholesale & retail | 2015 |
| Brewbob Services Ltd | Mining & quarrying | 2022 |
| Brick Bond (Northern) Limited | Manufacturing | 2012 |
| Brick Bond Solutions Limited | Wholesale & retail | 2016 |
| Britannia Ledger Ltd | Professional & scientific | 2026 |
| Britannia Machinery (Pontefract) Limited | Manufacturing | 1986 |
| Brockson Carpets Limited | Wholesale & retail | 2003 |
| Brook Plumbing & Heating Ltd | Construction | 2021 |
| Brum Smash Limited | Hospitality | 2025 |
| BSK Hospitality Group Limited | Hospitality | 2023 |
| BSK Produce (Yorkshire) Ltd | Hospitality | 2024 |
| BSP Commercials Ltd | Administrative & support | 2023 |
| Bspoqe Creative Ltd | Professional & scientific | 2023 |
| Bspoqe Displays Ltd | Professional & scientific | 2020 |
| Buildings Transformed Limited | Real estate | 2015 |
| BW - 76 Ltd | Wholesale & retail | 2025 |
| BW Plumbing & Heating Ltd | Energy | 2015 |
| BWL Property Limited | Construction | 2024 |
| Bykateanna Ltd | Other services | 2025 |
| C & a Tools Limited | Wholesale & retail | 2014 |
| C Mowbray Ltd | Wholesale & retail | 2011 |
| C S Autos (Pontefract) Ltd | Wholesale & retail | 2013 |
| C W Harrison & SON Ltd | Transport & logistics | 2002 |
| C&D Groundworks Ltd | Construction | 2006 |
| C&N Building Solutions Limited | Construction | 2020 |
| C. S. Broadcast Operations Ltd | Information & communication | 2005 |
| Cadbert Construction Ltd | Construction | 2022 |
| Calathea Care Ltd | Health & social care | 2024 |
| Calder Valley Property Investments Ltd | Real estate | 2024 |
| Campaign for Responsible Rodenticide USE | Professional & scientific | 2005 |
| Camper Rent UK Limited | Administrative & support | 2020 |
| Candleesa Ltd | Wholesale & retail | 2020 |
| Cannalink Ltd | Extraterritorial | 2025 |