| Bmty Group Limited | Information & communication | 2022 |
| Bmty Properties Ltd | Real estate | 2022 |
| BNM Newcastle Limited | Wholesale & retail | 2023 |
| Bo-Bi Ltd | Other services | 2023 |
| Boakes Holdings Ltd | Real estate | 2019 |
| Boars Head Boutique Hotel Ltd | Real estate | 2019 |
| Boatcrew Limited | Information & communication | 2023 |
| Boaxies Ltd | Real estate | 2017 |
| BOB Gins T/A Causey House Tea Rooms Ltd | Hospitality | 2020 |
| BOB Health Care Ltd | Health & social care | 2024 |
| BOB Rudd Leisure Limited | Administrative & support | 1995 |
| BOB Rudd Limited | Administrative & support | 2014 |
| Bobby Emporium Ltd | Wholesale & retail | 2024 |
| Bobbys Wholesale Ltd | Wholesale & retail | 2023 |
| Bobella Studio Ltd | Manufacturing | 2026 |
| BOC Escapes Ltd | Arts & recreation | 2024 |
| Bodachra Property Group Ltd | Real estate | 2020 |
| Bodee Property Group Ltd | Real estate | 2021 |
| Bodies MH Ltd | Other services | 2025 |
| Bodo Developments Limited | Construction | 2018 |
| Body & Mind Massage Ltd | Health & social care | 2012 |
| Body Collection Limited | Wholesale & retail | 1979 |
| Body Image Fitness Ltd | Arts & recreation | 2022 |
| Body Repair Byker Limited | Wholesale & retail | 2026 |
| Body Repair Clinic Ltd | Other services | 2021 |
| Body Restoration Services Limited | Wholesale & retail | 2021 |
| Bodycare Clinics Limited | Health & social care | 2004 |
| Bodyfix Northeast Ltd | Wholesale & retail | 2025 |
| Bodyguards Fitness Service Limited | Arts & recreation | 2010 |
| Bodyroll Studios Newcastle Ltd | Health & social care | 2023 |
| Boei Limited | Financial services | 2021 |
| Boho Arts Limited | Arts & recreation | 2021 |
| Boho Arts Trading Limited | Wholesale & retail | 2025 |
| Boiler Maintenance (Newc) Limited | Construction | 2009 |
| Boiler Repairs North East Ltd | Construction | 2023 |
| Boiler Spares Hub Ltd | Wholesale & retail | 2025 |
| Boilerhouse Jesmond Limited | Other services | 2023 |
| Boilerhouse Ouseburn Limited | Other services | 2016 |
| Boja Construction Ltd | Construction | 2024 |
| Bojolar Natural Skincare Limited | Wholesale & retail | 2019 |
| Bolaji Aura Limited | Manufacturing | 2025 |
| Bolam Estates Limited | Real estate | 2025 |
| Bolton Bros (Footwear and Orthotics) Ltd | Manufacturing | 2017 |
| Bolton Bros. (Surgical Shoe Makers) Limited | Manufacturing | 1952 |
| Bombae Box Ltd | Hospitality | 2021 |
| Bomiefada Foods & Events Limited | Manufacturing | 2025 |
| Bonaldi Hydraulics Limited | Information & communication | 2000 |
| Bonbon Group Ltd | Information & communication | 2016 |
| Bond Business Solutions Limited | Information & communication | 2007 |
| Bondlife Limited | Health & social care | 2024 |
| Bondurant Limited | Real estate | 2017 |
| Bone Walton Limited | Real estate | 2005 |
| Bonello Auto Services Limited | Wholesale & retail | 2003 |
| Bones Club Ltd | Wholesale & retail | 2020 |
| Bonnie & Margot Ltd | Real estate | 2026 |
| Bonny Talent Ltd | Professional & scientific | 2026 |
| Bonnyday Ltd | Professional & scientific | 2011 |
| Bonway-Direct Limited | Wholesale & retail | 2017 |
| Book Direct Advertising Ltd | Professional & scientific | 2024 |
| BOOK2GO Ltd | Transport & logistics | 2025 |
| Books & ACCOUNTS4U Limited | Professional & scientific | 1998 |
| Books & PAY Ltd | Administrative & support | 2019 |
| Books and Bakes Ltd | Wholesale & retail | 2025 |
| Boom Creative Consultants Limited | Professional & scientific | 2004 |
| Bootham Capital Office Service Ltd | Information & communication | 2025 |
| Bootlegger Speakeasy Limited | Hospitality | 2017 |
| BOOZE4US (Boro) Limited | Wholesale & retail | 2024 |
| Boozy Pops Ltd | Hospitality | 2025 |
| Boquerones Tapas & Cocktails Limited | Hospitality | 2019 |
| Borakaj Ltd | Construction | 2024 |
| Borderline and Bowman Travel Limited | Transport & logistics | 2018 |
| Boreal Cleaning Ltd | Administrative & support | 2026 |
| Borg Group Holdings PTY Ltd | Information & communication | 2025 |
| Boris Fletcher Limited | Financial services | 2022 |
| Born Digital Health IP Limited | Extraterritorial | 2021 |
| Born Digital Health Ltd | Health & social care | 2019 |
| Born Digital Health Research and Innovation Limited | Extraterritorial | 2021 |
| Borsetta London Ltd | Wholesale & retail | 2025 |
| Bosco Enterprises NZ Limited | Administrative & support | 2021 |
| Bosoftware Solutions Ltd | Information & communication | 2024 |
| Bosphorus ST Neots Ltd | Hospitality | 2024 |
| Boss Finishes Limited | Construction | 2017 |
| Boston Court Management Company Limited | Real estate | 1997 |
| Botanica Viva Ltd | Wholesale & retail | 2026 |
| Botanical View Court Management Limited | Hospitality | 2023 |
| Bottle Green Digital Ltd | Professional & scientific | 2021 |
| Bottleworks (UK) Ltd | Real estate | 2021 |
| Bouches Mechanical Ltd | Construction | 2025 |
| Boulevard Media Limited | Arts & recreation | 1994 |
| Bound Solutions Ltd | Professional & scientific | 2024 |
| Boutique Bar and Tipi Company Limited | Hospitality | 2016 |
| Boutique DI Moda Ltd | Wholesale & retail | 2025 |
| Bowe Digital Limited | Information & communication | 2016 |
| Bowe Homes Ltd | Real estate | 2021 |
| Bowers & Norman (2) LLP | | 2024 |
| Bowers & Norman Ltd | Construction | 2019 |
| Bowers Family Investment Limited | Financial services | 2021 |
| Bowes Manor Residents Management Company Limited | Households | 2023 |
| Bowes Mitchell (Residential Lettings) Limited | Real estate | 2017 |
| Bowes Mitchell Limited | Real estate | 2001 |