| Barker Property Consultants Limited | Real estate | 2021 |
| Barnetby Developments Ltd | Construction | 2021 |
| Barrett Holdings Limited | Real estate | 2003 |
| Bassaam Ltd | Health & social care | 2024 |
| Bassadanza Ltd | Agriculture & fishing | 2024 |
| Battarbee & Jones Ltd | Construction | 2023 |
| Baysgarth Limited | Construction | 2014 |
| Bayston (Yorkshire) Limited | Energy | 2015 |
| BB Camper Conversions Ltd | Manufacturing | 2022 |
| Bcop Property Ltd | Real estate | 2019 |
| Beancountant Limited | Professional & scientific | 2024 |
| Beck Close Management Limited | Households | 2015 |
| Becklands Developments Limited | Real estate | 2012 |
| Becklands Park Management Company Limited | Real estate | 2012 |
| Becoming 360 Ltd | Education | 2021 |
| Beech Hill Residential Investments Limited | Real estate | 1993 |
| Bespoke Consultancy Solutions Limited | Administrative & support | 2022 |
| Better Said Studio Ltd | Professional & scientific | 2019 |
| Big Dog Design & Marketing Limited | Professional & scientific | 2022 |
| Birchen Limited | Manufacturing | 2014 |
| Bkss Property Management Ltd | Real estate | 2021 |
| Black Cat Homes Limited | Professional & scientific | 2009 |
| Black Cat Promotions (Beverley) Limited | Professional & scientific | 2004 |
| Black Holt | Wholesale & retail | 2012 |
| Black PAW 4X4 Limited | Wholesale & retail | 2004 |
| Black Water Capital Management Limited | Financial services | 2016 |
| Blackbird & Wren Limited | Construction | 2024 |
| Blenela Ltd | Professional & scientific | 2024 |
| BLH Solutions Ltd | Professional & scientific | 2012 |
| Blink Video Limited | Information & communication | 2017 |
| Blossom & Bloom Childcare Ltd | Health & social care | 2024 |
| Blue Ocean Enterprises Ltd | Professional & scientific | 2024 |
| Bluewaters Healthcare Limited | Health & social care | 2020 |
| Bluways Hybrids Limited | Extraterritorial | 2011 |
| Bohemia Boutique Ltd | Wholesale & retail | 2013 |
| Boomerang Data Consultants Ltd | Information & communication | 2007 |
| Boundary Business Park Limited | Extraterritorial | 1990 |
| Box of Jobs Ltd | Administrative & support | 2015 |
| Boxedstuff Limited | Wholesale & retail | 2013 |
| Brambley Lodge Day Nursery Ltd | Administrative & support | 2018 |
| Brantingham Barns Limited | Hospitality | 2024 |
| Brantingham Holdings Limited | Financial services | 2021 |
| Brantingham Investment Group Ltd | Other services | 2019 |
| Bricknell Consultants Limited | Professional & scientific | 2008 |
| Bronte People Solutions Limited | Extraterritorial | 2024 |
| Brough Community Fitness Ltd | Arts & recreation | 2024 |
| Brough East Yorkshire Limited | Hospitality | 2011 |
| Brough Golf Club Limited | Arts & recreation | 2017 |
| Brough Golf Course Company Limited(The) | Real estate | 1920 |
| Brough Haven Limited | Real estate | 1940 |
| Brough Manor Care Home Limited | Health & social care | 2008 |
| Brough Skip Hire Ltd | Water & waste | 2021 |
| Brough Smart Repair Centre Ltd | Wholesale & retail | 2018 |
| Brough Technical Solutions Ltd | Manufacturing | 2025 |
| Brough Tyre Services Ltd | Professional & scientific | 2017 |
| Brown's Ecommerce Ltd | Wholesale & retail | 2023 |
| Brusby Surveyors Limited | Administrative & support | 2017 |
| Bubbles Handmade Cosmetics Ltd | Manufacturing | 2022 |
| Building Places Limited | Construction | 2013 |
| Burakturan Solutions Ltd | Wholesale & retail | 2025 |
| Burlington Lovel Ltd | Health & social care | 2016 |
| Business Express Group Limited | Information & communication | 2015 |
| Buypath Ltd | Professional & scientific | 2025 |
| C & R Holdings Howden Ltd | Financial services | 2020 |
| C G Construction Limited | Construction | 2016 |
| C K Evans Transport Ltd | Transport & logistics | 2020 |
| C L Fabrications (UK) Ltd | Manufacturing | 2012 |
| C.C. Jessop Haulage Co. Ltd. | Transport & logistics | 1994 |
| C.M.A.C. (UK) Limited | Wholesale & retail | 2004 |
| C.M.W. Horticulture Limited | Wholesale & retail | 1989 |
| C.S.T Maintenance and Repair Ltd | Construction | 2025 |
| Cafe SS Limited | Hospitality | 2026 |
| Cakey Bakey Newport, Brough Limited | Manufacturing | 2025 |
| CAL Agency Limited | Professional & scientific | 2015 |
| Caldera Asset Management Limited | Information & communication | 1998 |
| California Lodge Garden Centre Ltd | Wholesale & retail | 2020 |
| Callens African Woods Ltd | Wholesale & retail | 2021 |
| Callum Ross Ltd | Real estate | 2024 |
| Cambridge Glasshouse Company Limited | Construction | 2001 |
| Cambridge Group Holding Limited | Financial services | 2021 |
| Cambridgehok Construction Ltd | Construction | 2009 |
| Cambridgehok Cooling Systems Holding Limited | Financial services | 2023 |
| Cambridgehok Ltd | Professional & scientific | 2004 |
| Cambridgehok Refrigeration Limited | Construction | 2023 |
| Canine Colosseum Limited | Other services | 2025 |
| Capture the Day Photography Limited | Extraterritorial | 2016 |
| Caravan Genie Ltd | Manufacturing | 2022 |
| Cardwell Family Holdings Limited | Real estate | 2022 |
| Cartana Consulting Limited | Administrative & support | 2024 |
| Castle Procurement Services Ltd | Administrative & support | 2022 |
| Castle Spa Lucy Ltd | Other services | 2010 |
| Castorvida Ltd | Wholesale & retail | 2023 |
| Cave Dwellings Limited | Construction | 2020 |
| Cave Game Ltd | Wholesale & retail | 2025 |
| Cave Logic Supply Limited | Professional & scientific | 2010 |
| Cave Physiotherapy Limited | Health & social care | 2019 |
| Cavermill Estates Limited | Real estate | 1988 |
| CB Founder Ltd | Wholesale & retail | 2026 |
| CCS Civils Ltd | Construction | 2024 |
| CCS Group of Companies Limited | Administrative & support | 2025 |