| Blueberry Food Service Consultancy Limited | Hospitality | 2010 |
| Bluebirds Estates Limited | Real estate | 2023 |
| Blueboard Ltd | Wholesale & retail | 2019 |
| Bluebox Transport Ltd | Transport & logistics | 2026 |
| Bluedwiv Ltd | Information & communication | 2025 |
| Bluegrove Executive Homes Limited | Construction | 2008 |
| Bluegrove Investments Ltd | Real estate | 2018 |
| Bluegrove Properties Limited | Construction | 2007 |
| Bluelimit Developments Limited | Real estate | 1987 |
| Blueline Software Solutions Ltd | Information & communication | 2015 |
| Bluelinemedia Limited | Information & communication | 2004 |
| Blueprint Architecture Ltd | Professional & scientific | 2001 |
| Blueprint Financial Solutions Ltd | Administrative & support | 2004 |
| Blueprint Protect Ltd | Financial services | 2013 |
| Blueprint South West Limited | Administrative & support | 2017 |
| Blueroan Equestrian Ltd | Wholesale & retail | 2016 |
| Bluesky Coaching Limited | Professional & scientific | 2005 |
| Bluestar Accounting Limited | Professional & scientific | 2010 |
| Bluewater Design and Build Limited | Construction | 2019 |
| Blumango Creative Ltd | Professional & scientific | 2012 |
| Blynx AIM Ltd | Information & communication | 2024 |
| BM Property Group Limited | Real estate | 2020 |
| Bmci Ltd | Construction | 2026 |
| BMJ Electrical Services - Cheltenham Ltd | Construction | 2021 |
| BMM Scaffolding Ltd | Construction | 2025 |
| BMS Property Group Ltd | Real estate | 2009 |
| BMS R3 Limited | Financial services | 2020 |
| BMS Technology Sales Limited | Administrative & support | 2020 |
| BMW Historic Motor Club (UK) Ltd | Other services | 2006 |
| Bnki Homes Limited | Construction | 2025 |
| Bnki Investments Ltd | Real estate | 2023 |
| Bnki Property Ltd | Real estate | 2022 |
| BO Capital Group Limited | Administrative & support | 2022 |
| BO POP FIC Limited | Real estate | 2021 |
| BO POP Properties Limited | Real estate | 2021 |
| BO POP Pubs Limited | Hospitality | 2021 |
| Boardiez Ltd | Real estate | 2022 |
| Boards Cafe Ltd | Hospitality | 2023 |
| Bobbitee Play Ltd | Health & social care | 2024 |
| Boddington Estates Limited | Agriculture & fishing | 1966 |
| Body and Face Clinic Ltd | Other services | 2023 |
| Body Mind & Spirit Limited | Administrative & support | 1991 |
| Body Transformation Cheltenham Ltd | Arts & recreation | 2018 |
| BODY4YOUPT Limited | Other services | 2007 |
| Bogblaster Limited | Extraterritorial | 2020 |
| Bogi M Transport Ltd | Transport & logistics | 2023 |
| Bogle Homes Ltd | Real estate | 2022 |
| Bogle Mortgages Ltd | Financial services | 2021 |
| Boketto Horizons Limited | Real estate | 2016 |
| BOL Realisations Limited | Manufacturing | 1903 |
| Bolt Electrical Limited | Construction | 2017 |
| Bolt Hole Retreats Limited | Real estate | 2016 |
| BOM Care Ltd | Health & social care | 2025 |
| Bomad BTL Limited | Real estate | 2019 |
| Bombay Hospitality Limited | Hospitality | 2021 |
| Bonaparte Group Limited | Administrative & support | 2001 |
| Bond Bespoke Ltd | Real estate | 2020 |
| Bondend Lane Management Ltd | Households | 2023 |
| Bondend Management Company Ltd | Households | 2016 |
| Bonding Holdco Limited | Financial services | 2026 |
| Bonds Mill Estate Limited | Real estate | 1985 |
| Bonehill Capital Ltd. | Real estate | 2012 |
| Bonfield Architecture and Design Limited | Professional & scientific | 2020 |
| Bonners (Oxford) Limited | Wholesale & retail | 2009 |
| Bonra Limited | Manufacturing | 2019 |
| Bonte Trading Company Ltd | Hospitality | 2022 |
| Boogieman Productions Limited | Other services | 2007 |
| Book Buccaneer Limited | Wholesale & retail | 2025 |
| Book-Rite Limited | Professional & scientific | 2010 |
| Boolean Operators Limited | Information & communication | 2012 |
| Boondock Cabins Limited | Hospitality | 2023 |
| Boonslaw Limited | Households | 1976 |
| Boost Data Limited | Information & communication | 1995 |
| Boost PR Ltd | Professional & scientific | 2022 |
| Boote Financial Planning Limited | Financial services | 2009 |
| Bora Investments Limited | Professional & scientific | 2012 |
| Borges & Scott Limited | Wholesale & retail | 2024 |
| Borges AI Ltd | Information & communication | 2025 |
| Born Snooty Limited | Extraterritorial | 2011 |
| Boscombe by the Beach Ltd | Real estate | 2024 |
| Boseley Electrical Limited | Construction | 2022 |
| Bosewell Ltd | Real estate | 2020 |
| Boss Dog Grooming Ltd | Administrative & support | 2018 |
| Boston AI Limited | Information & communication | 2024 |
| Bostonia Limited | Professional & scientific | 2021 |
| Bosworth Holdings Ltd | Professional & scientific | 2019 |
| Botanica Bars Ltd | Hospitality | 2021 |
| Botanica Cheltenham Limited | Hospitality | 2021 |
| Botanical Rose Limited | Wholesale & retail | 2020 |
| Bouchard Procurement & Book Keeping Services Limited | Professional & scientific | 2017 |
| Boudica Mindset Coaching Ltd | Other services | 2024 |
| Boulders Site 2 Limited | Arts & recreation | 2019 |
| Bourn Realty Limited | Real estate | 2025 |
| Bourne River Ltd | Financial services | 2025 |
| Bournside Consulting Limited | Information & communication | 2011 |
| Bournside Developments Ltd | Real estate | 2020 |
| Bourton Bathrooms and Kitchens Limited | Wholesale & retail | 2015 |
| Bourton Business Hub Ltd | Real estate | 2021 |
| Bourton Gymnastics Ltd | Arts & recreation | 2024 |
| Bourton Limited | Real estate | 2016 |