| Ascot Place Estate Ltd | Financial services | 2008 |
| Ascot Racecourse Betting & Gaming Limited | Arts & recreation | 2017 |
| Ascot SAS Financial Services Limited | Financial services | 2012 |
| Ascot Seven Limited | Professional & scientific | 2015 |
| Ascot Towers Limited | Households | 2005 |
| Ascot Tree Services Limited | Agriculture & fishing | 2015 |
| Ascot Wealth Management Ltd | Professional & scientific | 2010 |
| Ascot Wealth Property and Finance Ltd | Real estate | 2020 |
| Ascot Window Cleaning Ltd | Administrative & support | 2018 |
| Ascot Wines UK Ltd | Wholesale & retail | 2017 |
| Ascot Wood Management Ltd. | Real estate | 2013 |
| Ascotcabz.Com Ltd | Transport & logistics | 2020 |
| Ashbury and Bloom Development Limited | Real estate | 2015 |
| Ashbury and Bloom Ltd | Construction | 2002 |
| Ashridge Land Limited | Construction | 2005 |
| Ashridge Properties Limited | Construction | 1999 |
| Askand Group Limited | Extraterritorial | 2007 |
| Askuk Ltd | Wholesale & retail | 2010 |
| Aspire Care Solutions Ltd | Public administration | 2025 |
| Aspire Medical Group Limited | Health & social care | 2009 |
| Aspire Medical Partnerships Limited | Extraterritorial | 2011 |
| Aspra Properties Ltd | Construction | 2018 |
| Astra City Limited | Real estate | 1990 |
| Astral Marine Services Limited | Administrative & support | 1998 |
| AT Designed Ltd | Professional & scientific | 2019 |
| Atherstone Britannia Ltd | Construction | 2018 |
| Athru Consulting Services Ltd | Information & communication | 2024 |
| Atlantic Skye Ltd | Real estate | 2022 |
| Atlas Cars of Sunningdale Limited | Transport & logistics | 2010 |
| Atnica Limited | Professional & scientific | 2017 |
| Atom Holdings 2023 Ltd | Financial services | 2023 |
| Atticus Blue Ltd | Construction | 2017 |
| Atypical Virtues Ltd | Professional & scientific | 2025 |
| Augbray Ltd | Financial services | 2025 |
| Augustine Seventeen Ltd | Administrative & support | 2018 |
| Aura Beauty Box Limited | Extraterritorial | 2012 |
| Aurilis Solutions Limited | Information & communication | 2025 |
| Auto MSC Ltd | Wholesale & retail | 2024 |
| Avalon Vehicle Sales Limited | Wholesale & retail | 2020 |
| Avelor Limited | Professional & scientific | 2024 |
| Avimore Consulting Limited | Professional & scientific | 2016 |
| Avlog Limited | Transport & logistics | 1991 |
| Avsl Ltd | Administrative & support | 2016 |
| AW Accounts Ltd | Professional & scientific | 2020 |
| Awareness Coaching and HR Ltd | Administrative & support | 2023 |
| AWM Direct SA Limited | Professional & scientific | 2017 |
| Aydin Adam Ltd | Administrative & support | 2017 |
| B&C SA Limited | Hospitality | 2023 |
| Babbl`On Films Limited | Information & communication | 2004 |
| Badyal Ltd | Real estate | 2025 |
| Bagshot Cars Ltd | Transport & logistics | 2014 |
| Bagshot Taxis Ltd | Transport & logistics | 2024 |
| Bankwell Consulting Ltd | Information & communication | 2006 |
| Barebones Mining Limited | Administrative & support | 2011 |
| Bareena Investments Ltd | Households | 2024 |
| Bassan Solutions Limited | Other services | 2014 |
| Bassett Trading Limited | Professional & scientific | 2020 |
| Bath Brains Limited | Construction | 2023 |
| Bauwerk Group UK Ltd | Wholesale & retail | 2004 |
| Bay Willow Ltd | Real estate | 2015 |
| Bayliss Consulting Limited | Professional & scientific | 2000 |
| Bayside Associates Limited | Other services | 2023 |
| BCD Scaffolding Limited | Construction | 2008 |
| BE Aligned Marketing Ltd | Professional & scientific | 2026 |
| BE Nimbl Ltd | Administrative & support | 2020 |
| Beach Beautiful Limited | Wholesale & retail | 2018 |
| Beaconsfield Care Limited | Health & social care | 2005 |
| Bearloom Ltd | Manufacturing | 2025 |
| Bearroc Sales and Lettings Ltd | Administrative & support | 2016 |
| Beatmypain.Online Ltd | Information & communication | 2018 |
| Beauty Camp Profesional Limited | Wholesale & retail | 2017 |
| Bedrock Data & Analytics Limited | Information & communication | 2026 |
| Beeches Worthing Holding Limited | Health & social care | 2022 |
| Belavskis Limited | Professional & scientific | 2019 |
| Belgravia Apartments Management Company Limited | Households | 2025 |
| Beling Limited | Wholesale & retail | 2003 |
| Bell Executive Consulting & Coaching Ltd | Professional & scientific | 2014 |
| Bella Agencies Ltd | Wholesale & retail | 2026 |
| Bellapart UK Limited | Construction | 2012 |
| Bellatrix Strength LAB Limited | Arts & recreation | 2026 |
| Belle Grace Systems Ltd | Professional & scientific | 2019 |
| Beluck Limited | Wholesale & retail | 2023 |
| Belvedere Grange Limited | Households | 1995 |
| Benelle Property Ltd | Real estate | 2014 |
| Benjamin's Workshop Limited | Construction | 2023 |
| Berkeley Capital Ventures Limited | Professional & scientific | 2024 |
| Berks & Wilts Property Ltd | Real estate | 2025 |
| Berkshire & Harley LLP | | 2014 |
| Berkshire 5IVES Ltd | Hospitality | 2019 |
| Berkshire GAS Service Limited | Energy | 2011 |
| Berkshire Hospitality Consulting Ltd | Real estate | 2020 |
| Berkshire Leisure Ltd | Administrative & support | 2020 |
| Berkshire Williams Limited | Professional & scientific | 2026 |
| Berrywood Residents Management Company Limited | Real estate | 2011 |
| Beryl Estates Ltd | Real estate | 2020 |
| Beryl HC Ltd | Health & social care | 2020 |
| Bespoke Europe Limited | Wholesale & retail | 2011 |
| Bespoke Properties Services Ltd | Construction | 2020 |
| Bevy Nest Limited | Wholesale & retail | 2025 |
| Beyond Oceans Limited | Professional & scientific | 2022 |