| Bay Games Ltd | Wholesale & retail | 2023 |
| Bay Leaf Paraplanning Services Ltd | Financial services | 2015 |
| Bay Podiatry Ltd | Health & social care | 2014 |
| Bay Tales Limited | Arts & recreation | 2021 |
| Baycha Limited | Hospitality | 2024 |
| Baycraft Developments Ltd | Construction | 2026 |
| Baynaz Limited | Hospitality | 2025 |
| BCA (NT) Ltd | Other services | 2024 |
| BDA Property Services Ltd | Construction | 2022 |
| BE Kind. NO Excuses CIC | Health & social care | 2022 |
| Beach-Hols.Com Limited | Real estate | 2010 |
| Bear Wolf Games Ltd | Information & communication | 2018 |
| Beaumont Building Services Ltd | Construction | 2018 |
| Beaumont Management Shiremoor Ltd | Real estate | 2021 |
| Bedrock Growth Agency Ltd | Professional & scientific | 2023 |
| Bedrock Property Limited | Real estate | 2024 |
| Beehive Live Limited | Information & communication | 2023 |
| Beehive Properties Limited | Real estate | 2008 |
| Beem Beauty & Training Ltd | Other services | 2023 |
| Behalla Store Ltd | Wholesale & retail | 2020 |
| Beldons Waypoint Ltd | Hospitality | 2018 |
| Bells Homes Limited | Real estate | 2022 |
| Bellwoods Lifestyle Store Ltd | Wholesale & retail | 2020 |
| Belmont Grange Prestige Care Ltd | Health & social care | 2023 |
| Benjamin Christopher Ltd | Wholesale & retail | 2023 |
| Benson Media Consultancy Limited | Administrative & support | 2024 |
| Bestford Accounts Services Ltd | Real estate | 2012 |
| Better ME Better US Ltd | Administrative & support | 2021 |
| Better Shopper Journeys Ltd | Professional & scientific | 2023 |
| Beverley Leisure Limited | Real estate | 1987 |
| BH Properties NE Ltd | Households | 2024 |
| BIC Holdings Limited | Administrative & support | 1995 |
| Bigbite Services Ltd | Hospitality | 2026 |
| Bigg Market Bars Ltd | Construction | 2022 |
| Billy E Thompson Ltd | Arts & recreation | 2025 |
| Binary Technology Services Limited | Information & communication | 2018 |
| Birch and Thorn Ltd | Other services | 2026 |
| Birch Court (Seaton Delaval) Limited | Other services | 2020 |
| Birkdale Solutions Limited | Professional & scientific | 2011 |
| Birwin Architectural Limited | Construction | 2022 |
| Bison Vista Ltd | Professional & scientific | 2021 |
| BIZ Code Limited | Information & communication | 2009 |
| BJG Energy Services Ltd | Mining & quarrying | 2020 |
| Bjkc Limited | Professional & scientific | 2016 |
| Bjorn Properties Limited | Real estate | 2026 |
| Black Dog (NE) Ltd | Real estate | 2025 |
| Black Door Limited | Other services | 2012 |
| Blackrock Bay Ltd | Hospitality | 2026 |
| Blaircroft Limited | Professional & scientific | 1979 |
| Blindstrader Limited | Information & communication | 2024 |
| Blossoming Communities CIC | Health & social care | 2021 |
| BLU Print & Design Limited | Manufacturing | 2017 |
| Blubbercove Ltd | Wholesale & retail | 2025 |
| Blue Bramble Tea House Ltd | Hospitality | 2017 |
| Blue Star Engineering Limited | Professional & scientific | 2022 |
| Boardsortuk Ltd | Manufacturing | 2026 |
| Boath Limited | Real estate | 2020 |
| Boiler Friendly Heating Services Ltd | Other services | 2010 |
| Botmax Holdings Limited | Wholesale & retail | 2023 |
| Bougie.Vip Ltd | Other services | 2022 |
| BP Industries Limited | Wholesale & retail | 2003 |
| Brachtvogel Winding Services Ltd | Manufacturing | 2019 |
| Brannen & Partners LLP | | 2011 |
| Brannen (Property) Limited | Real estate | 1960 |
| Brash Ltd | Wholesale & retail | 2022 |
| Bread on the Tyne Ltd | Manufacturing | 2019 |
| Brenkley Accountants Limited | Professional & scientific | 2011 |
| Brennon Lettings Ltd | Real estate | 2022 |
| Brew&Bind Ltd | Hospitality | 2026 |
| Bricks & Brews Ltd | Hospitality | 2024 |
| Bridges Media & Consulting Ltd | Information & communication | 2024 |
| Brierdene Heating and Plumbing Ltd. | Construction | 2021 |
| Brierdene Properties Ltd | Real estate | 2019 |
| Bright Psychology Limited | Health & social care | 2013 |
| Brightledger Limited | Professional & scientific | 2025 |
| Britannia Office Systems Limited | Manufacturing | 1997 |
| Britsafe Firedoors Ltd | Construction | 2026 |
| Broadwake Limited | Extraterritorial | 1986 |
| Brockmans Cardiac Limited | Health & social care | 2025 |
| Brookfield Flats Company (Gosforth) Limited(The) | Households | 1965 |
| Brooled Ltd | Wholesale & retail | 2022 |
| BSJ Facility Management Limited | Arts & recreation | 2021 |
| Bucca Geoscience Limited | Professional & scientific | 2026 |
| Buddha Lounge Limited | Hospitality | 2018 |
| Burlington Consultants Limited | Professional & scientific | 2018 |
| Burn'T Orange Ltd | Wholesale & retail | 1999 |
| Bush Plant Hire Limited | Administrative & support | 1959 |
| Business Tips Ltd | Professional & scientific | 2013 |
| BX Corp. Ltd | Other services | 2017 |
| BY the Bay Mushroom Co. Ltd | Hospitality | 2023 |
| C & C Rigging Limited | Construction | 2014 |
| C G Mills Property Ltd | Real estate | 2014 |
| C&C Consultancy HLD Limited | Financial services | 2024 |
| C&P Accounting Services Limited | Professional & scientific | 2025 |
| C&P Property Limited | Real estate | 2025 |
| C.C.Mcrae Limited | Real estate | 1932 |
| C.H.F. Inspection Services Ltd | Real estate | 2005 |
| C.M Home and Garden Developments Ltd | Construction | 2025 |
| C.R.A.I. Ltd | Professional & scientific | 2010 |
| C8H10N4O2 Ltd | Wholesale & retail | 2019 |