| Bethos Limited | Professional & scientific | 2020 |
| Bettinis Ice-Cream Limited | Wholesale & retail | 2002 |
| BG Umbra Limited | Energy | 2020 |
| Bide-A-Wee Cottage Garden & Nursery Ltd. | Wholesale & retail | 2008 |
| Big K Tyre and Mechanical Limited | Wholesale & retail | 2023 |
| Bilton Cremation Services Ltd | Manufacturing | 2020 |
| BIM SO Limited | Professional & scientific | 2020 |
| BIM55 Limited | Professional & scientific | 2015 |
| BIN Boutique Northumberland Limited | Administrative & support | 2019 |
| BIO Recycling Solutions Limited | Agriculture & fishing | 2002 |
| Birdcages and Dragonflies Ltd | Hospitality | 2020 |
| Birkett Projects Ltd | Energy | 2025 |
| Birling Construction Services Ltd | Professional & scientific | 2012 |
| Bishop Commerce Ltd | Wholesale & retail | 2025 |
| Bistro 34 Limited | Hospitality | 2016 |
| BJ Law LLP | | 2026 |
| BJM IT Services Ltd | Information & communication | 2022 |
| BL Projects Ltd | Professional & scientific | 2023 |
| Black and White Consultants Ltd | Professional & scientific | 2023 |
| Black Bear Paddleboarding Limited | Manufacturing | 2007 |
| Black Bull Leisure Group Limited | Hospitality | 2025 |
| Black Sheep Farm Health LLP | | 2017 |
| Blackridge Consulting Limited | Administrative & support | 2022 |
| Blackridge Recruitment Limited | Administrative & support | 2022 |
| Blakwax Ltd | Information & communication | 2009 |
| Blewitt Property Development Ltd | Real estate | 2025 |
| Blue Ace Consultant Limited | Professional & scientific | 2018 |
| Blue Green Vision Ltd | Manufacturing | 2019 |
| Blue Heron Developments Ltd | Construction | 2018 |
| Bluesky Caravan Park Ltd | Hospitality | 2023 |
| Boat Farm Holidays Limited | Hospitality | 2019 |
| Bodycraft (Ashington) Limited | Wholesale & retail | 2003 |
| Bolam Materials Research Ltd | Professional & scientific | 2017 |
| BON Accord House Management Limited | Real estate | 1999 |
| BON Marche (Wallsend) Limited | Real estate | 1931 |
| Bonington Properties Limited | Real estate | 2003 |
| Bootleg Eagles Live Ltd | Arts & recreation | 2024 |
| Border Heating Spares Limited | Wholesale & retail | 2002 |
| Borderland Conversions Ltd | Construction | 2023 |
| Boulevards 21 Limited | Hospitality | 2021 |
| Bowmman Limited | Wholesale & retail | 2025 |
| Braces Covered Limited | Health & social care | 2022 |
| Brady Plumbing & Heating Ltd | Construction | 2008 |
| Braefoot Lettings Limited | Real estate | 2016 |
| Brand & Equity Ltd | Professional & scientific | 2024 |
| Brass BEE Limited | Wholesale & retail | 2020 |
| Breva Powervale Limited | Energy | 2020 |
| Brewis Beer Co Ltd | Manufacturing | 2018 |
| Brewood Investments Limited | Arts & recreation | 2017 |
| Brewood Property Developments Ltd | Real estate | 2019 |
| Brewster Orthopaedic Services Ltd | Health & social care | 2010 |
| Briardale House Youth and Community Projects Ltd | Other services | 2019 |
| Brick Club Tattoo Ltd | Other services | 2019 |
| Bridge Street Cafe Limited | Hospitality | 2018 |
| Brierley's Ground Force Limited | Administrative & support | 2015 |
| Brinkburn Water Management Company Limited | Households | 2025 |
| Brit REM Ltd | Construction | 2019 |
| Brit.Gold International Ltd | Information & communication | 2025 |
| Britannia Educational Intelligent Systems Ltd | Information & communication | 2017 |
| British Beef Jerky Limited | Hospitality | 2004 |
| British Horse Loggers Charitable Trust | Education | 2006 |
| Broadhope Limited | Professional & scientific | 2012 |
| Broadleaf Construction Development (Gateshead) Limited | Construction | 2018 |
| Broom Heights Ltd | Households | 2018 |
| Broom Heights NO. 1 Ltd | Real estate | 2019 |
| Broom House Farm Limited | Agriculture & fishing | 2013 |
| Broomhill & District Garden & Allotment Community Interest Company | Wholesale & retail | 2017 |
| Brosnan Roofing & Maintenance Ltd | Construction | 2023 |
| Browns Photography Limited | Extraterritorial | 2003 |
| BS Wonders Limited | Real estate | 2024 |
| Buckley Homes (NE) Limited | Construction | 2025 |
| Budle Bay Holdings Limited | Financial services | 2022 |
| Burgham Park Residents Association Limited | Professional & scientific | 2014 |
| Burley Properties Ltd | Real estate | 2021 |
| Burnhill Derwent Cottage Ltd | Hospitality | 2021 |
| Bushbuck Safaris Ltd. | Administrative & support | 1985 |
| Business Independence Limited | Hospitality | 2020 |
| Buston Oils Limited | Manufacturing | 2024 |
| Buston Potatoes Ltd | Administrative & support | 2026 |
| C & D Outdoors Limited | Construction | 2012 |
| C & L F Ltd | Households | 2019 |
| C J Sample Limited | Real estate | 2013 |
| C Prompt (UK) Limited | Information & communication | 1993 |
| C&G Installations (NE) Ltd | Construction | 2021 |
| C&G Property (NE) Ltd | Real estate | 2019 |
| C-Sectionuk Ltd | Education | 2024 |
| C2WAK Consulting Ltd | Information & communication | 2026 |
| C4 Limited | Real estate | 2005 |
| C4 Sightcare Morpeth Limited | Wholesale & retail | 2014 |
| Café DES Amis Limited | Hospitality | 2022 |
| Callum Foster Ltd | Construction | 2023 |
| Camosca Ltd | Hospitality | 2025 |
| Campmuir Consulting Limited | Professional & scientific | 2014 |
| Campmuir Creatives Limited | Wholesale & retail | 2016 |
| Campwild Ltd | Hospitality | 2023 |
| Canba Powervale Limited | Energy | 2020 |
| Canny Places Ltd | Construction | 2023 |
| Canuna Softworks Ltd | Professional & scientific | 2020 |
| Capriem Limited | Professional & scientific | 2025 |
| Car-Ching Limited | Wholesale & retail | 2014 |