| Artistic Enterprise Limited | Construction | 2012 |
| Arundel View Management Company Limited | Households | 2006 |
| Arvy Denim Ltd | Wholesale & retail | 2026 |
| Asclepius Construction Solutions Ltd | Professional & scientific | 2014 |
| Ascot Event Hire Limited | Manufacturing | 1999 |
| Ascot Events Limited | Arts & recreation | 1999 |
| Askew Nelson Ltd | Professional & scientific | 2009 |
| Asmithcompany Ltd | Information & communication | 2018 |
| Asset Class Ltd | Professional & scientific | 2020 |
| Astral Accountancy Services Limited | Professional & scientific | 1989 |
| Astwood Technology Limited | Information & communication | 2025 |
| Atacama Films Limited | Information & communication | 2008 |
| Atacama Limited | Information & communication | 2007 |
| Atec Group (Holdco) Limited | Financial services | 2017 |
| Atec Group (Midco) Limited | Financial services | 2017 |
| Atec Group Holdings Limited | Financial services | 2017 |
| Atec Group Limited | Financial services | 2017 |
| Atelier ST Louis Ltd | Professional & scientific | 2016 |
| Atelier Yurga Ltd | Other services | 2023 |
| Atheras Limited | Information & communication | 2015 |
| Athlion Ltd | Administrative & support | 2020 |
| ATS (CN) Limited | Real estate | 2014 |
| Attleys Ltd | Wholesale & retail | 2022 |
| Attract Inform Convince Ltd | Wholesale & retail | 2022 |
| Aurora GLO Ltd | Wholesale & retail | 2026 |
| Auto GB Ltd. | Financial services | 1999 |
| Autoperla Limited | Administrative & support | 2026 |
| Avion Partners Ltd | Transport & logistics | 2012 |
| Avocado Talent Management Limited | Arts & recreation | 2024 |
| Axinteractive Limited | Information & communication | 2006 |
| AXS Trading Limited | Other services | 2026 |
| B Innovation Cleaning Limited | Administrative & support | 2025 |
| B Innovation Plumbing and Heating Limited | Construction | 2025 |
| B N M (BD) Limited | Hospitality | 2022 |
| B. Wright Construction Ltd. | Construction | 2008 |
| BAD Girl Books Ltd | Wholesale & retail | 2025 |
| Badboy Properties Ltd | Real estate | 2026 |
| Bagnalls Haulage Limited | Wholesale & retail | 1992 |
| Balance Healthcare Limited | Wholesale & retail | 1998 |
| Baldwin Crown Ltd | Real estate | 2025 |
| Ballard and Morrell (Farming) Limited | Agriculture & fishing | 1998 |
| Bambooh & YOU Ltd | Wholesale & retail | 2022 |
| Bambooh Bicester Ltd | Education | 2023 |
| Bambooh Education Ltd | Education | 2015 |
| Bambooh Hook Norton Ltd | Education | 2023 |
| Bamcroft Limited | Professional & scientific | 2018 |
| Barnacle Innovation Ltd | Professional & scientific | 2023 |
| Barron's Cotswold Travel Ltd. | Administrative & support | 2019 |
| Basemagazine Limited | Arts & recreation | 2010 |
| Baste Bits Ltd | Other services | 2024 |
| Baste Events Ltd | Other services | 2024 |
| Baste Ltd | Hospitality | 2020 |
| Bath Stone Company (BSC) Limited | Mining & quarrying | 2017 |
| Bath Stone Company Limited | Mining & quarrying | 1981 |
| Bath Stone Group Limited | Financial services | 2017 |
| BCC Aviation Limited | Transport & logistics | 2017 |
| Beauty for Ltd. | Wholesale & retail | 2013 |
| Beauty Inks Limited | Other services | 2021 |
| Bedborough Consulting Limited | Professional & scientific | 2008 |
| Beechdale Limited | Real estate | 2003 |
| Beehive Home & Lifestyle Ltd | Wholesale & retail | 2021 |
| Beffective Limited | Education | 2012 |
| Behave Limited | Arts & recreation | 1999 |
| Beijing Gourmet Ltd | Hospitality | 2025 |
| Bella Howard Photography Ltd | Other services | 2014 |
| Benjamin Ball Associates Ltd | Financial services | 2010 |
| Benjia Limited | Professional & scientific | 2023 |
| Beringer Offshore Ltd | Mining & quarrying | 2021 |
| Berkshire Farriers Ltd. | Administrative & support | 2004 |
| Bespoke OFF Road (Oxford) Ltd | Wholesale & retail | 2016 |
| Bespoke Pools Ltd | Construction | 2018 |
| Bespoke Signage Solutions Ltd | Manufacturing | 2024 |
| Big Cat Training Limited | Administrative & support | 2003 |
| Big Chimney Productions Ltd | Professional & scientific | 2014 |
| Bijoux Gallerie Limited | Wholesale & retail | 1999 |
| Biolevel Limited | Agriculture & fishing | 2016 |
| Biothread Limited | Agriculture & fishing | 2023 |
| Bisley Leisure Hire Limited | Administrative & support | 2004 |
| Blackthorn Ltd | Wholesale & retail | 2022 |
| Bledington & Foscot Community Association Limited | Health & social care | 2013 |
| Blue Jeans Management Ltd | Arts & recreation | 2016 |
| Blue Moose Recruitment Ltd | Administrative & support | 2020 |
| Blue Planet Expeditions Limited | Administrative & support | 2020 |
| Blue Sky Renewables Ltd | Construction | 2021 |
| Blue Zulu Ltd | Administrative & support | 2008 |
| Bluevector Ocean Ltd | Professional & scientific | 2026 |
| BO Hart Ltd | Other services | 2019 |
| Boardwalk Creative Ltd | Information & communication | 2024 |
| Bode LDN Ltd | Wholesale & retail | 2026 |
| Bomet UK Ltd | Manufacturing | 2009 |
| Bomford Estates Limited | Real estate | 2002 |
| Book ME in Tickets Limited | Information & communication | 2020 |
| Bordsus Property Co.Limited | Real estate | 1957 |
| Boston Media Limited | Professional & scientific | 2010 |
| Botley Windscreens Limited | Manufacturing | 2016 |
| Bouk (Chipping Norton) Ltd | Other services | 2016 |
| Bould Limited | Wholesale & retail | 2008 |
| Bountiii Ltd | Information & communication | 2026 |
| Bowd Consultants Ltd | Extraterritorial | 2006 |
| Bowerbird Group Limited | Financial services | 2015 |