| Belford Group Ltd | Wholesale & retail | 2020 |
| Bella Pizzeria Castleford Ltd | Hospitality | 2024 |
| Bella Tent Rental Ltd | Wholesale & retail | 2024 |
| Bellingham IT Ltd | Information & communication | 2021 |
| BEN Crooks Coaching Ltd | Health & social care | 2023 |
| Bespoke Detection Services Limited | Administrative & support | 2013 |
| Bespoke Roofing & Guttering Services Ltd | Construction | 2025 |
| Best Ever 139 Ltd | Other services | 2024 |
| Betavibes Ltd | Wholesale & retail | 2026 |
| Better Spaces Enterprises Limited | Health & social care | 2025 |
| Bexin Limited | Professional & scientific | 2019 |
| BGD Group Limited | Financial services | 2018 |
| BGD Properties Limited | Real estate | 2018 |
| Bhart's Properties Ltd | Real estate | 2026 |
| Big Discount Castleford Ltd | Wholesale & retail | 2025 |
| Bigbapz Ltd | Hospitality | 2025 |
| Bila Transport Ltd | Transport & logistics | 2019 |
| Bilal's Fastfood Ltd | Hospitality | 2023 |
| Bilals Ltd | Hospitality | 2025 |
| Billmac Roofing Ltd | Construction | 2023 |
| Bio-Pharma(Uk) Limited | Wholesale & retail | 2012 |
| Bison Assist Group Limited | Financial services | 2020 |
| Bison Assist Holdings Limited | Extraterritorial | 2016 |
| Bison Assist Limited | Health & social care | 2010 |
| BIT Cyber Ltd | Information & communication | 2021 |
| BIT Recruit Limited | Administrative & support | 2020 |
| Blackbear Construction Contractors Limited | Construction | 2025 |
| Blackberry Walk (York) Ltd | Real estate | 2025 |
| Blackbook App Ltd | Information & communication | 2025 |
| Blaqmour Investment Ltd | Wholesale & retail | 2020 |
| BLEND8D Solutions Limited | Information & communication | 2024 |
| Blind Barbers 2 Ltd | Other services | 2025 |
| Blue Bubble Consulting Limited | Administrative & support | 2017 |
| Blue Portal Properties Ltd | Real estate | 2022 |
| Bluebell Transport Ltd | Transport & logistics | 2012 |
| Blueinc Online Limited | Wholesale & retail | 2019 |
| Blueman Health Limited | Health & social care | 2017 |
| Blueprint Property Care Ltd | Health & social care | 2024 |
| BMA Foods Limited | Wholesale & retail | 2010 |
| Bolawole Limited | Health & social care | 2018 |
| Bollard Depot Ltd | Real estate | 2023 |
| Bonita Hair & Beauty Ltd | Other services | 2010 |
| Book Library Limited | Other services | 2018 |
| Borislav Birds Ltd Ltd | Agriculture & fishing | 2025 |
| Bovesync Ltd | Information & communication | 2025 |
| Bow&Coproperties Ltd | Real estate | 2023 |
| Bowen Learning Ltd | Information & communication | 2019 |
| Boxing Barn Limited | Arts & recreation | 2017 |
| Boyler Limited | Construction | 2017 |
| BPH Nationwide Scaffolding Ltd | Construction | 2025 |
| Brane-Tec Limited | Wholesale & retail | 2020 |
| Braus Logistics Ltd | Transport & logistics | 2025 |
| Breath Limited | Manufacturing | 2000 |
| Brenton Brickwork Limited | Construction | 2023 |
| Brenton Developments UK Ltd | Construction | 2020 |
| Bricking IT Properties Ltd | Real estate | 2024 |
| Bridge Homes (Yorkshire) LLP | | 2014 |
| Bright Sparks Childcare (Yorkshire) Ltd | Health & social care | 2022 |
| Bright Star Support Ltd | Health & social care | 2021 |
| Brightgreen Plastics Limited | Manufacturing | 2010 |
| Brokerbrain Limited | Information & communication | 2017 |
| Brookdale Group Ltd | Administrative & support | 2016 |
| Brookdale Transport & Crane Services Ltd | Transport & logistics | 2013 |
| Brookdale Transport Limited | Transport & logistics | 2008 |
| Brooke Edgley Specialist Technical Services Limited | Construction | 1957 |
| Brookson (5002C) Limited | Administrative & support | 2007 |
| Brush on Luxe Ltd | Wholesale & retail | 2022 |
| BRY & MAR Limited | Wholesale & retail | 1995 |
| BSA Haulage Ltd | Transport & logistics | 2023 |
| Btms Trading Limited | Construction | 2013 |
| Btwbc Entertainment Ltd | Manufacturing | 2025 |
| Bubbles Hand Car Wash (Selby) Limited | Wholesale & retail | 2020 |
| Buildersco Ltd | Construction | 2024 |
| Building Developments Group Limited | Construction | 2024 |
| Burgating Peri Peri Limited | Hospitality | 2025 |
| Burton Family Homes Ltd | Households | 2021 |
| Bywater Cafe Ltd | Hospitality | 2026 |
| Bywater Car Centre Ltd | Wholesale & retail | 2026 |
| C & H Property Management Ltd | Real estate | 2020 |
| C & S Noble Rentals LLP | | 2016 |
| C and J Speight Limited | Extraterritorial | 2014 |
| C Pizza (HM) Ltd | Hospitality | 2018 |
| C&S Shutterdoors & Tailift Supplies Limited | Wholesale & retail | 2005 |
| C.Moxon Ltd | Professional & scientific | 2024 |
| C13 Professional Yacht Service Ltd | Manufacturing | 2026 |
| Cabinetry Company Limited | Wholesale & retail | 2018 |
| Caged Steel Communities C.I.C. | Education | 2020 |
| Caged Steel Martial Arts Ltd | Education | 2020 |
| Caged Steel MMA Limited | Arts & recreation | 2024 |
| Caine Management Limited | Information & communication | 2017 |
| Calder Fields Resident Management Company Limited | Households | 2026 |
| Calder Park Management Services Limited | Real estate | 2005 |
| Calderfront Limited | Real estate | 2019 |
| Caldino Holdings Ltd | Financial services | 2017 |
| Calland Ltd | Professional & scientific | 2023 |
| Cambridge (UK) Recruitment Consultants Ltd | Real estate | 2022 |
| Cambridgeshire Energy Partnerships Limited | Professional & scientific | 2020 |
| Cammax Limited | Manufacturing | 1999 |
| CAP Properties and Developments Ltd | Real estate | 2024 |
| Car Body Repair & Paint Ltd | Wholesale & retail | 2020 |