| Bell Ventilation Services Ltd | Construction | 2015 |
| Bentley Properties (North East) Ltd | Real estate | 2021 |
| Bergin TM Ltd | Construction | 2024 |
| Biblio Limited | Information & communication | 2022 |
| Big Bite Pizza (NE) Ltd | Hospitality | 2025 |
| Big Northumberland Limited | Arts & recreation | 2011 |
| Bigbite Pizza Ltd | Hospitality | 2018 |
| BIN Boutique (UK) Limited | Administrative & support | 2008 |
| BIN Boutique Limited | Administrative & support | 2007 |
| BIN Boutique North Tyneside Limited | Other services | 2021 |
| BIN Boutique South Tyneside Limited | Administrative & support | 2026 |
| Bins of Beauty Limited | Administrative & support | 2024 |
| BJM Asset Management Ltd | Households | 2026 |
| Blacksheep Barbering Academy Ltd | Education | 2025 |
| Blush Beauty Academy Ltd | Education | 2019 |
| Blyth (NE) Barbers Ltd | Other services | 2025 |
| Blyth Autocare Limited | Wholesale & retail | 2024 |
| Blyth Barbells and Fitness Ltd | Administrative & support | 2016 |
| Blyth Battery Volunteers Limited | Arts & recreation | 2012 |
| Blyth Bespoke Fabrication and Coatings Ltd | Manufacturing | 2023 |
| Blyth Bespoke Fabrication Ltd | Manufacturing | 2025 |
| Blyth Burger Ltd | Hospitality | 2025 |
| Blyth Catering NE Ltd | Hospitality | 2018 |
| Blyth Cobblers Ltd | Wholesale & retail | 2012 |
| Blyth Communications Limited | Professional & scientific | 2011 |
| Blyth Contract Catering Limited | Hospitality | 2019 |
| Blyth Curtain Fabrics Ltd | Wholesale & retail | 2009 |
| Blyth Family Funerals Ltd | Other services | 2022 |
| Blyth Golf Club Limited(The) | Arts & recreation | 1908 |
| Blyth MAN Shed C.I.C. | Other services | 2019 |
| Blyth Masonic Buildings Limited | Hospitality | 1932 |
| Blyth Motors Ltd | Wholesale & retail | 2020 |
| Blyth Nails Ltd | Other services | 2022 |
| Blyth Pizza BOY Ltd | Hospitality | 2025 |
| Blyth Pizza Ltd | Hospitality | 2026 |
| Blyth Service Station Limited | Wholesale & retail | 2022 |
| Blyth South Beach Surf School CIC | Education | 2026 |
| Blyth Spartans 2024 C.I.C. | Arts & recreation | 2024 |
| Blyth Spartans Association Football Club Limited | Arts & recreation | 1946 |
| Blyth Specsavers Limited | Wholesale & retail | 1994 |
| Blyth Star Enterprises Limited | Agriculture & fishing | 1987 |
| Blyth Tall Ship | Education | 2010 |
| Blyth Valley Disabled Forum Ltd | Health & social care | 1997 |
| Blyth Visionplus Limited | Wholesale & retail | 1994 |
| Blythflame Fast Food Ltd | Hospitality | 2025 |
| Bobby's Fish and Chips Ltd | Hospitality | 2021 |
| Bonny Styling Ltd | Other services | 2023 |
| Boss GM Comps UK Ltd | Wholesale & retail | 2025 |
| Boxing Well Ltd | Other services | 2020 |
| Bradley Stubbs Construction Ltd | Construction | 2025 |
| Bradleys@Home Limited | Real estate | 2021 |
| Breeze Lounge Limited | Hospitality | 2022 |
| Brendan Soulsby Plumbing & Heating Limited | Construction | 2011 |
| Bridge Street Bar Limited | Hospitality | 2023 |
| Brizzy Ltd | Professional & scientific | 2024 |
| Broadway Supermarket (Blyth) Ltd | Wholesale & retail | 2017 |
| Brolly Holdings Ltd | Real estate | 2024 |
| BT Bolting Solutions Ltd | Manufacturing | 2014 |
| Buglass Holdings Limited | Financial services | 2019 |
| Build Layer Ltd | Professional & scientific | 2025 |
| Build North East Limited | Construction | 2024 |
| C and C Properties Northeast Ltd | Real estate | 2024 |
| C Clear Window Cleaning Limited | Administrative & support | 2024 |
| C G Wind Ltd | Manufacturing | 2021 |
| C H Commercial Fleet Services (NE) Ltd | Transport & logistics | 2018 |
| C L Associates N.E. Ltd | Other services | 2010 |
| C Pomery Limited | Construction | 2025 |
| C Smith Welding and Fabrication Ltd | Professional & scientific | 2020 |
| C&G North East Ltd | Real estate | 2025 |
| C.F. (Plastics & Waste Products) Ltd. | Arts & recreation | 1987 |
| CA Leisure Limited | Hospitality | 2026 |
| Caffe Sirena Limited | Hospitality | 2001 |
| Cafm Assist Limited | Information & communication | 2026 |
| Calderdale Wind Farm Ltd | Construction | 2021 |
| Cambois Plastics Limited | | 1973 |
| Canny Clean Ltd | Households | 2024 |
| Canny Creative Ltd | Professional & scientific | 2015 |
| Capinc Limited | Financial services | 2021 |
| Capsule ARC Studio Limited | Wholesale & retail | 2026 |
| Carr & Co (NE) Holding Limited | Financial services | 2021 |
| Carr & Co (Northumberland) Limited | Administrative & support | 2025 |
| Carr & Co Solicitors (NE) Limited | Professional & scientific | 2014 |
| Caterquip (GB) Limited | Wholesale & retail | 2000 |
| CC Engineering and Fabrication Limited | Manufacturing | 2008 |
| CE Installation Solutions Ltd | Construction | 2025 |
| Cfcsl Limited | Administrative & support | 2015 |
| CG Lifting Ltd | Construction | 2018 |
| Chamonix Training UK Limited | Education | 2019 |
| Charlton Properties Group Limited | Real estate | 2024 |
| Chopin Investments Limited | Real estate | 2020 |
| Chrystoria Consulting & Services Ltd | Professional & scientific | 2025 |
| CHS City New Ltd | Hospitality | 2025 |
| Ciccarelli Italian Ice Cream Limited | Manufacturing | 2012 |
| Citadel Storage Solutions Ltd | Real estate | 2024 |
| Citadel Surveyors Ltd | Professional & scientific | 2018 |
| CJB Mechanical Solutions Ltd | Professional & scientific | 2025 |
| Cjracch Limited | Wholesale & retail | 2020 |
| Ckml Limited | Hospitality | 2010 |
| Cksevents&Leisure Ltd | Hospitality | 2026 |
| Clarence Spirits Limited | Wholesale & retail | 2019 |