| Bari Tea Wholesale Ltd | Manufacturing | 2018 |
| Barry's Home Bakery Limited | Manufacturing | 1964 |
| Barter Books Limited | Wholesale & retail | 2012 |
| Barton Ecogen Ltd | Construction | 2023 |
| Bath Sixteen Limited | Wholesale & retail | 2016 |
| Bay Property Services Limited | Administrative & support | 2003 |
| BB Properties (UK) Limited | Real estate | 2006 |
| BB Properties Blyth Ltd | Real estate | 2026 |
| BB Properties Foundry Ltd | Real estate | 2025 |
| Bear Property Holdings Ltd | Financial services | 2020 |
| Bella Pizza & Cafe Ltd | Hospitality | 2025 |
| Bewick Folly Management Company Ltd | Real estate | 2011 |
| Bewicks Kitchen Ltd | Hospitality | 2020 |
| Beyond Limits Consultancy Limited | Other services | 2007 |
| BG Leisure Ltd | Hospitality | 2021 |
| Big Laces Limited | Wholesale & retail | 2012 |
| Bilge (Alnwick) Ltd | Hospitality | 2019 |
| Black Cat Yarns Limited | Wholesale & retail | 2017 |
| Black Oak Tree Services Ltd | Professional & scientific | 2022 |
| Black Pepper Inns Ltd | Hospitality | 2025 |
| Blackshaw's Garage (Alnwick) Limited | Wholesale & retail | 1977 |
| Bloch & Co UK Ltd | Wholesale & retail | 2020 |
| Blue Dolphins Management Limited | Households | 2023 |
| Blue Gables Laundry Ltd | Administrative & support | 2026 |
| Boats Come Inn Limited | Hospitality | 2021 |
| Boho Alnwick Ltd | Hospitality | 2021 |
| Border Projects (North East) Ltd | Construction | 2024 |
| Border Webworks Limited | Information & communication | 2017 |
| Boutique Ravello Ltd. | Wholesale & retail | 2014 |
| Bown and Casement Limited | Wholesale & retail | 2012 |
| Bread and Roses (Northumberland) Limited | Manufacturing | 2014 |
| Breamish Valley Cottages Limited | Construction | 1998 |
| Brendan Teasdale Masonry Conservation Ltd | Construction | 2018 |
| Brewis Scott Associates Ltd | Arts & recreation | 2017 |
| Broadway Circle Ltd | Hospitality | 2024 |
| Brockdam Utilities Management Company Ltd. | Water & waste | 2017 |
| Brockthorpe Consultancy RT Ltd | Professional & scientific | 2022 |
| Bromly Medical Services Ltd | Health & social care | 2014 |
| Broxmouth Leisure Limited | Real estate | 2009 |
| Bryan Gregory (Motor Engineer) Ltd | Wholesale & retail | 2025 |
| Budle Barns Management Company Limited | Households | 2016 |
| Budle Bay Bothies Ltd | Hospitality | 2019 |
| Bulldog Camping Co. Ltd | Administrative & support | 2025 |
| Butterworth Dentist Limited | Health & social care | 2007 |
| Buttons Daycare Nursery Ltd | Education | 2013 |
| BY AP Limited | Professional & scientific | 2023 |
| C Taylor Construction Limited | Construction | 2017 |
| Cabosse Limited | Manufacturing | 2007 |
| Caffe Tirreno 45 Limited | Hospitality | 2019 |
| Callaly Castle Gardens Limited | Households | 1987 |
| Callaly Castle Museum Wing Management Company Limited | Households | 1989 |
| Cameron James Entertainment’S Ltd | Hospitality | 2023 |
| Care Kept Local Limited | Public administration | 2024 |
| Carr-Ellison Farms | Agriculture & fishing | 1962 |
| Carter Dene Management Company Limited | Households | 2020 |
| Castello Catering Ltd | Hospitality | 2025 |
| Castle and Coast Properties Ltd | Real estate | 2025 |
| Castle Mortgage Solutions Ltd | Financial services | 2022 |
| Castle Three Motor Company Limited | Manufacturing | 2013 |
| Castle View on Narrowgate Limited | Real estate | 2022 |
| CB Iron Ltd | Manufacturing | 2025 |
| CD Elite Car Care Ltd | Administrative & support | 2025 |
| Chained & Able Ltd | Professional & scientific | 2014 |
| Chapman Cinematics Ltd | Information & communication | 2024 |
| Charlton Hall (Leisure) Ltd | Hospitality | 2021 |
| Charlton Mires Farm Limited | Agriculture & fishing | 2021 |
| Charnley Nicotine Ltd | Wholesale & retail | 2022 |
| Chatton Capital Ltd | Financial services | 2018 |
| Chatton Fisheries Limited | Agriculture & fishing | 2024 |
| Chatton Village Store Ltd | Wholesale & retail | 2018 |
| Cherry Blossom Garden Services Ltd | Administrative & support | 2022 |
| Cheviot Developments Ltd | Construction | 2020 |
| Cheviot Gateway Stays Limited | Hospitality | 2025 |
| Cheviot Productions Ltd | Information & communication | 2023 |
| Chez Ananda Limited | Health & social care | 2023 |
| Chez Vacances Limited | Real estate | 2023 |
| Chillingham Manor Ltd | Hospitality | 2025 |
| Chillingham Wild Cattle Association Limited | Agriculture & fishing | 1939 |
| Choirs at Work Ltd | Education | 2014 |
| Chris Davison Agencies Ltd | Wholesale & retail | 1999 |
| Church View Rennington Management Company Limited | Real estate | 2019 |
| Claire Skene Limited | Professional & scientific | 2013 |
| Claire's Consulting Solutions Limited | Professional & scientific | 2023 |
| Claverton Solutions Limited | Professional & scientific | 2013 |
| Clean That Cottage Ltd | Administrative & support | 2025 |
| Clive Mattison Architectural Services Ltd. | Professional & scientific | 2014 |
| Closegate Haymarket Hub Limited | Construction | 2008 |
| Closegate Projects Limited | Construction | 2005 |
| CLOUD9 Roofing Systems Ltd | Construction | 2021 |
| Coach for Growth Ltd | Professional & scientific | 2019 |
| Coach Inn PUB Limited | Hospitality | 2023 |
| Coast & Country Connections Ltd. | Real estate | 1981 |
| Coast and Castles Holiday Park Ltd | Hospitality | 2021 |
| COAST2COAST Painters & Decorators Ltd | Construction | 2025 |
| Coastal Content Ltd | Administrative & support | 2008 |
| Coastal Properties Holdings Ltd | Financial services | 2025 |
| Coastal Properties NE Ltd | Real estate | 2023 |
| Coastal Properties North East Limited | Administrative & support | 2019 |
| Coastal Property Partnership LLP | | 2016 |
| Coastline Heating & Plumbing Services Ltd | Construction | 2021 |