| Avebury Management Company Limited | Households | 1997 |
| Averiss and SON Ltd | Construction | 2020 |
| Aviation Financial Services Ltd | Administrative & support | 1999 |
| Aviation House (Farnborough) Residents Management Company Limited | Households | 2015 |
| Avod Services Ltd | Other services | 2019 |
| Avondale Business Park Ltd | Hospitality | 2006 |
| Award Financial Planning Ltd | Financial services | 2023 |
| Axiella Ltd | Information & communication | 2025 |
| Axis Centre Management Company Limited | Administrative & support | 2006 |
| AYU G P Ltd | Real estate | 2025 |
| B&B Cleaning and Maintenance Services Limited | Administrative & support | 2025 |
| B&S Fleet Ltd | Hospitality | 2025 |
| B.E. Sports Media Limited | Information & communication | 2013 |
| Baboo Ltd | Information & communication | 2013 |
| Back to Chiropractic Limited | Health & social care | 2009 |
| Badenhorstproperties Ltd | Real estate | 2024 |
| Badgers Hollow Management Company Limited | Households | 2003 |
| BAK Flooring Ltd | Construction | 2024 |
| Bakehouse Gardens Management Company Limited | Real estate | 2002 |
| Baker & Baker Accountancy LLP | | 2017 |
| Balanced Being Ltd | Professional & scientific | 2014 |
| Banana Boilers Limited | Construction | 2022 |
| Banner Property (Franklin) Limited | Construction | 1986 |
| Bapm Consulting Limited | Information & communication | 2016 |
| Barceloneta Limited | Information & communication | 2014 |
| Bareham Drive Management Limited | Households | 2018 |
| Barehill Limited | Professional & scientific | 2018 |
| Barnard House (Apartments) Management Company Limited | Households | 2003 |
| Barrell Construction Limited | Information & communication | 2010 |
| Barrier Therapeutics, Inc. | | 2005 |
| Barrowclough Consultancy Limited | Professional & scientific | 2015 |
| Baseiq Limited | Administrative & support | 2025 |
| Baselane Ltd | Information & communication | 2026 |
| Basemsp Ltd | Information & communication | 2022 |
| Bayes Health Ltd | Professional & scientific | 2025 |
| Bayvision Ltd | Information & communication | 2011 |
| BCD Meetings & Events Limited | Administrative & support | 1986 |
| BCG Limited | Wholesale & retail | 2026 |
| Bcrc GOH Limited | Real estate | 2024 |
| Bdwlondon Ltd | Real estate | 2013 |
| BE Cleaner Limited | Administrative & support | 2017 |
| BE Grounded Limited | Wholesale & retail | 2020 |
| Beagley Commercial Ltd | Professional & scientific | 2024 |
| Bean at the Park Limited | Hospitality | 2024 |
| Bean+Bub Ltd | Wholesale & retail | 2025 |
| Bear Construction & Maintenance Limited | Construction | 2025 |
| Bearwood Court (Maintenance) Limited | Households | 1975 |
| Beauchamp Consultancy Services Ltd | Information & communication | 2018 |
| Beautyfill Aesthetics Ltd | Health & social care | 2020 |
| Bedford Court (Farnborough) RTM Company Ltd | Households | 2017 |
| BEE Botanical Ltd | Manufacturing | 2021 |
| BEE Smart Driving School Limited | Education | 2022 |
| Beech Tree Court (Elvetham) Management Company Limited | Households | 2016 |
| Beharrells Ltd | Wholesale & retail | 2026 |
| Beispiel Ltd | Professional & scientific | 2016 |
| Bella Capri Restaurant Limited | Hospitality | 2023 |
| Bellis Mews (Warfield) Management Company Limited | Households | 2026 |
| Bellissimo Castello Ltd | Hospitality | 2025 |
| Bellota Productions Limited | Information & communication | 2012 |
| Belmont Mews Residents Trust Limited | Real estate | 2022 |
| BEN Holt Consulting Limited | Administrative & support | 2019 |
| Bending Technical Solutions Ltd | Professional & scientific | 2015 |
| Bens Doors and Windows Ltd | Professional & scientific | 2025 |
| Bentley Lodge RTM Company Limited | Households | 2007 |
| Bentley Moore Executive Holdings Limited | Information & communication | 2017 |
| Berkeley Morgan Construction Limited | Construction | 2020 |
| Berkshire Bathrooms Limited | Extraterritorial | 2010 |
| Berkshire First AID Training Limited | Education | 2024 |
| Berkshire Powder Coatings Limited | Manufacturing | 2016 |
| Berry Bright Electrical Ltd | Construction | 2022 |
| Berry Hound Ltd | Professional & scientific | 2017 |
| Bertie Bobs Limited | Professional & scientific | 2013 |
| Bertie Travel Limited | Administrative & support | 2005 |
| Bespoke Offices Boss Solutions Ltd | Real estate | 2025 |
| Best Bar None Professional and Safer Venues | Hospitality | 2007 |
| Beth's Pawfect Stay Ltd | Other services | 2025 |
| Better Cleaning Company Limited | Other services | 2002 |
| Bexington Ltd | Real estate | 2013 |
| Beyond Blocks Ltd | Real estate | 2025 |
| Beyondswim Ltd | Wholesale & retail | 2021 |
| Bhawan Enterprise Ltd. | Professional & scientific | 2025 |
| Bhawani Planning & Project Controls Ltd | Construction | 2017 |
| Bias Tech Ltd. | Information & communication | 2003 |
| Big Friday Limited | Administrative & support | 2002 |
| Bigsky IT Solutions Ltd | Information & communication | 2015 |
| BII | Professional & scientific | 2001 |
| Biibusiness Limited | Administrative & support | 1993 |
| BIM Design & Modelling Limited | Professional & scientific | 2014 |
| Binarybridge Ltd | Information & communication | 2013 |
| Bizzios-O’Connell Support Services Limited | Health & social care | 2024 |
| BL Building & Construction Ltd | Construction | 2026 |
| Black Sun Brewery Ltd | Manufacturing | 2023 |
| Blackwater Photographic Company Limited | Manufacturing | 1974 |
| Blaven Technologies LLP | | 2021 |
| Blaze Fitness UK Ltd | Arts & recreation | 2019 |
| Blcn Holdings Ltd | Wholesale & retail | 2024 |
| Blenheim Park (Bracknell) Management Company Limited | Households | 2013 |
| Blue Box Group Limited | Information & communication | 2016 |
| Blue Prior(Church Crookham) M.C. Limited | Real estate | 2008 |
| Blue Scope Advisory Ltd | Professional & scientific | 2026 |