| Burnell Hewitt Ltd | Construction | 2014 |
| Burnham Estates & Investments Limited | Real estate | 2015 |
| Burnhill Developments Ltd | Construction | 2026 |
| Burning Bull Ltd | Hospitality | 2022 |
| Burns Way Management Company (NO. 1) Limited | Households | 1991 |
| Burroughs 10 Limited | Financial services | 2025 |
| Business & Enterprise Finance (NE) Ltd | Financial services | 2014 |
| Business & Enterprise Finance Ltd. | Financial services | 1984 |
| Business Empowerment Services Limited | Information & communication | 2011 |
| Business Global Solutions Ltd | Information & communication | 2015 |
| Business Solutions (Essex) Limited | Administrative & support | 2024 |
| Business Strategic Solutions Ltd | Professional & scientific | 2010 |
| Business Switch Energy Ltd | Information & communication | 2023 |
| Business Transfer Hub Ltd | Professional & scientific | 2023 |
| Bussan Investments Ltd | Real estate | 2021 |
| Bussey-Hewitt (Mohair) Limited | Manufacturing | 1994 |
| Bussey-Hewitt Limited | Manufacturing | 1974 |
| Buster Skips Limited | Water & waste | 2025 |
| Buster Waste Management Limited | Administrative & support | 2011 |
| Busyai Technologies (UK) Ltd | Information & communication | 2026 |
| Butcher Buddy Limited | Manufacturing | 2026 |
| Butchers 123 Ltd | Wholesale & retail | 2024 |
| Butchers Arms (N Lincs) Limited | Hospitality | 2011 |
| Butler & Green PLC | Real estate | 2020 |
| Butler Metrology Services Limited | Construction | 2015 |
| Butt G Organic Salt Limited | Mining & quarrying | 2026 |
| Butt Karahi (BFD) Ltd | Hospitality | 2024 |
| Butt Karahi Bradford Ltd | Hospitality | 2020 |
| Buttercup Children's Trust | Other services | 2008 |
| Buttershaw Bookkeeping Service Ltd | Professional & scientific | 2015 |
| Buttershaw Christian Family Centre Limited | Education | 2004 |
| Buttershaw Convenience Store Ltd | Wholesale & retail | 2012 |
| BUX Trading Ltd | Real estate | 2024 |
| Buy New Bedding Ltd | Wholesale & retail | 2025 |
| Buy This One Ltd | Wholesale & retail | 2025 |
| Buy-Simplicity Ltd | Wholesale & retail | 2022 |
| Buyandgo Ltd | Wholesale & retail | 2023 |
| Buybreeze Ltd | Wholesale & retail | 2024 |
| Buydrift Ltd | Wholesale & retail | 2025 |
| Buyerzdemand Ltd | Wholesale & retail | 2024 |
| Buyzaar Ltd | Wholesale & retail | 2025 |
| Buzz Biss Limited | Wholesale & retail | 2024 |
| Buzzy Group Limited | Financial services | 2022 |
| BV56 Ltd | Hospitality | 2024 |
| Bver Ltd | Construction | 2025 |
| Bvrgry Limited | Hospitality | 2024 |
| BWA Property Group Ltd | Real estate | 2025 |
| BWC Properties Limited | Real estate | 2012 |
| BWR Group Ltd | Administrative & support | 2017 |
| BWR Tyre Services Limited | Administrative & support | 2009 |
| BWS Farming Limited | Agriculture & fishing | 2022 |
| BXT Logistics Limited | Transport & logistics | 2025 |
| BY Anmol Ltd | Wholesale & retail | 2024 |
| Byencee Limited | Wholesale & retail | 2021 |
| Bynnex Limited | Wholesale & retail | 2026 |
| Byte Vision Commerce Limited | Wholesale & retail | 2016 |
| Byterange Limited | Wholesale & retail | 2026 |
| BYTES4U Limited | Wholesale & retail | 2024 |
| Byzylivin Ltd | Other services | 2021 |
| BZ 1 Limited | Health & social care | 2022 |
| BZ Group Limited | Wholesale & retail | 2026 |
| BZ Optical Limited | Health & social care | 2017 |
| BZZ Investments Ltd | Financial services | 2020 |
| C & a Consulting Ltd | Professional & scientific | 2023 |
| C & a Locums Limited | Health & social care | 2012 |
| C & a Precision Engineering Limited | Manufacturing | 2003 |
| C & a Team Ltd | Other services | 2012 |
| C & F Hybrid Events Ltd | Arts & recreation | 2024 |
| C & J Bristowe Limited | Hospitality | 2011 |
| C & M Roofing Limited | Construction | 2009 |
| C & S Loxton Limited | Wholesale & retail | 2010 |
| C & S Mclean Ltd | Hospitality | 2019 |
| C a Naylor Ltd | Wholesale & retail | 2021 |
| C D E Joinery and Electrical Solutions. Limited | Construction | 2014 |
| C E X Consultancy Limited | Professional & scientific | 2017 |
| C J Varley Ventures Limited | Professional & scientific | 2018 |
| C L W Cleaning Services Limited | Administrative & support | 2003 |
| C M Distributors Ltd | Wholesale & retail | 2018 |
| C M S (KTP) Ltd | Construction | 2022 |
| C Newton Ltd | Wholesale & retail | 2019 |
| C P Northern Limited | Manufacturing | 2014 |
| C Stewart Ltd | Construction | 2015 |
| C T Glass Limited. | Manufacturing | 2006 |
| C W Refrigeration Limited | Professional & scientific | 2009 |
| C Z B Consultants Limited | Administrative & support | 2016 |
| C&G Logistics (Yorkshire) Ltd | Transport & logistics | 2023 |
| C&G Removals Limited | Transport & logistics | 2018 |
| C&N Housing Ltd | Real estate | 2020 |
| C&Sleisure Ltd | Hospitality | 2025 |
| C-Creationz Ltd | Wholesale & retail | 2025 |
| C. & H. Holdings Limited | Professional & scientific | 1986 |
| C. P. Burton Ltd | Information & communication | 2016 |
| C.Arora Logistics Ltd | Transport & logistics | 2026 |
| C.Butterfield Ltd | Administrative & support | 2014 |
| C.G.Mckeown Contractors Limited | Construction | 2009 |
| C.H. Wood Holdings Limited | Administrative & support | 2012 |
| C.H.H Estates Limited | Real estate | 2022 |
| C.I.D Ltd | Administrative & support | 2013 |
| C.K. Glendinning Associates Limited | Other services | 2003 |
| C.K. Hanson & SON Limited | Agriculture & fishing | 1979 |