| Berkshire Forklift Services Ltd | Manufacturing | 2020 |
| Berkshire Framework Ltd | Construction | 2026 |
| Berkshire Heat Ltd | Construction | 2017 |
| Berkshire Heat Pumps Ltd | Construction | 2023 |
| Berkshire Heating Solutions Limited | Construction | 2020 |
| Berkshire Hiab Services Limited | Transport & logistics | 2003 |
| Berkshire House Ltd | Real estate | 2023 |
| Berkshire Investors Holding Ltd | Wholesale & retail | 2026 |
| Berkshire Leadwork Limited | Construction | 2016 |
| Berkshire Lets Ltd | Real estate | 2018 |
| Berkshire Loft Solutions Ltd | Construction | 2024 |
| Berkshire Mechanical Services LLP | | 2016 |
| Berkshire Medical Services Limited | Health & social care | 2026 |
| Berkshire Pain Clinic LLP | | 2019 |
| Berkshire Pet Services Limited | Other services | 2010 |
| Berkshire Primary Care Limited | Health & social care | 2015 |
| Berkshire Property Investors (Redditch) Ltd | Arts & recreation | 2026 |
| Berkshire Property Investors Limited | Arts & recreation | 2020 |
| Berkshire Property Solutions Ltd | Real estate | 2022 |
| Berkshire Renewables Ltd | Financial services | 2023 |
| Berkshire Reptiles CIC | Education | 2026 |
| Berkshire Surrey Roofing Limited | Construction | 2018 |
| Berkshire Talent Ltd | Professional & scientific | 2020 |
| Berkshire Taylor Strategy Solutions Ltd | Professional & scientific | 2025 |
| Berkshire Technology Ltd | Information & communication | 2017 |
| Berkshire Waste and Clearance Limited | Water & waste | 2026 |
| Berkshirefurs CIC | Arts & recreation | 2024 |
| Berkshiretree Limited | Wholesale & retail | 2012 |
| Beronia Rentals Ltd | Real estate | 2025 |
| Berrybegood Ltd | Manufacturing | 2018 |
| Besafe Supplies Ltd | Wholesale & retail | 2017 |
| Besman Ltd | Health & social care | 2020 |
| Bespoke Venetian Plastering Ltd | Construction | 2020 |
| Best Care Kingdom Limited | Health & social care | 2025 |
| Best Fireworks UK Ltd | Wholesale & retail | 2022 |
| Best Practice Training Limited | Education | 2011 |
| Beswitchready Ltd | Administrative & support | 2026 |
| Beta CAE Systems UK Limited | Information & communication | 2016 |
| Betide Ltd. | Information & communication | 2017 |
| Bettison Associates Limited | Public administration | 2003 |
| Beverlecs Limited | Manufacturing | 2013 |
| Bezer Ltd | Manufacturing | 2025 |
| BF Spice Ltd | Hospitality | 2025 |
| Bfast Cleaning Ltd | Administrative & support | 2018 |
| BGA Recovery's Ltd | Wholesale & retail | 2026 |
| Bharanzie Ltd | Construction | 2025 |
| Bibity Bobity Brides Ltd | Wholesale & retail | 2019 |
| Big Brand Bear Limited | Professional & scientific | 2016 |
| Big Data International Limited | Information & communication | 2016 |
| Big Help Ltd | Administrative & support | 2018 |
| Big Salami Ltd | Information & communication | 2019 |
| Billingbear Farm Limited | Agriculture & fishing | 2007 |
| Biltong Emporium Limited | Wholesale & retail | 2012 |
| BIM & Laser Surveying Services Ltd | Information & communication | 2024 |
| Binfield 10K CIC | Arts & recreation | 2019 |
| Binfield Autos Ltd | Wholesale & retail | 2024 |
| Binfield Barbers Ltd | Other services | 2026 |
| Binfield Creative Hair Limited | Other services | 2026 |
| Binfield Electrical (Services) Limited | Construction | 2012 |
| Binfield Football Club Limited | Arts & recreation | 2004 |
| Binfield Village Stores Limited | Wholesale & retail | 2017 |
| Binfreshuk Ltd | Administrative & support | 2025 |
| Bing Metering Co. Ltd | Financial services | 2024 |
| Biohorizons Camlog UK & Ireland Ltd | Manufacturing | 2018 |
| Biostrat Consultancy Limited | Extraterritorial | 2023 |
| Birchetts 1957 Limited | Extraterritorial | 2015 |
| Birchman Solutions Limited | Information & communication | 1993 |
| Birchwood Marine International Limited | Transport & logistics | 2020 |
| Birchwood Marine Limited | Wholesale & retail | 2020 |
| Birchwood Nautical Group Limited | Transport & logistics | 2023 |
| Birchwood Road (Tenants Association) Limited | Households | 1990 |
| Birring-Sandhu Advisory Ltd | Professional & scientific | 2026 |
| Bissmire Planning Services Limited | Professional & scientific | 2014 |
| BIT Parallel Limited | Manufacturing | 2012 |
| BIT Time UK Ltd | Information & communication | 2017 |
| Bitsphere Ltd | Information & communication | 2025 |
| BJC Home Improvements Ltd | Construction | 2023 |
| BK Newco Ltd | Extraterritorial | 2019 |
| BKH Support Agency Ltd | Administrative & support | 2022 |
| BKH Supported Housing Services Ltd | Health & social care | 2024 |
| Bkhs Properties Limited | Real estate | 2018 |
| BL Developments Ltd | Construction | 2022 |
| Black Chapel Ltd | Wholesale & retail | 2025 |
| Black Marketing SMM Ltd | Professional & scientific | 2025 |
| Blackstone Brickwork Limited | Construction | 2017 |
| Blackwell Wood Ltd | Transport & logistics | 2023 |
| Blanchard Services Ltd | Construction | 2024 |
| Blooms&Done Ltd | Administrative & support | 2025 |
| Blue BEE Limited | Administrative & support | 2006 |
| Blue Moon Booths Ltd | Professional & scientific | 2025 |
| Blue Sapphire Book-Keeping Limited | Professional & scientific | 2009 |
| Blues Smokehouse Ltd | Hospitality | 2026 |
| Bluewater Consultancy Ltd | Administrative & support | 2025 |
| Blush and Sorella Ltd | Other services | 2025 |
| BM Flooring Ltd | Manufacturing | 2023 |
| BNB Priest Limited | Construction | 2025 |
| BNS Legal Consultancy Limited | Professional & scientific | 2025 |
| Boal Enterprises Ltd | Wholesale & retail | 2023 |
| Body Bronze (Basingstoke) Limited | Other services | 2002 |
| Bodytone (Berks) Ltd. | Wholesale & retail | 2008 |