| Audous Group Ltd | Financial services | 2023 |
| Audous Limited | Information & communication | 2020 |
| Augment Healthcare Limited | Professional & scientific | 2017 |
| Aurora Windows Limited | Wholesale & retail | 2025 |
| Austin and White Automotives Ltd | Wholesale & retail | 2020 |
| Autumnpaper Limited | Administrative & support | 2000 |
| AUX Creations Ltd | Wholesale & retail | 2025 |
| AVA Ideas Limited | Information & communication | 2021 |
| Avalon Innovations LLP | | 2011 |
| Avalon Marketing Limited | Information & communication | 2009 |
| Avalon Options Limited | Financial services | 2011 |
| Avela Healthcare Limited | Health & social care | 2022 |
| Aviation Days Ltd | Wholesale & retail | 2013 |
| Aviation Editing Services Limited | Professional & scientific | 2022 |
| Avinit Holdings Limited | Financial services | 2022 |
| Avinit Technical Limited | Information & communication | 2021 |
| Avins Country Kitchen Ltd | Hospitality | 2015 |
| Avins Hair and Beauty Ltd | Other services | 2015 |
| AVL Technology Ltd | Information & communication | 2017 |
| Avocet Travel Management Limited | Administrative & support | 2006 |
| AW Real Estate Asset Management Limited | Real estate | 2024 |
| Awarded Consultancy Ltd | Professional & scientific | 2024 |
| Awcock Home Improvements Limited | Construction | 2002 |
| Awecreative Limited | Professional & scientific | 2016 |
| AWL Zentrum Limited | Administrative & support | 2019 |
| AWW Property Ventures Limited | Construction | 2025 |
| Axisdale Limited | Professional & scientific | 1989 |
| Ayurlife Consultancy Services Ltd | Health & social care | 2021 |
| B & M Local Limited | Wholesale & retail | 2013 |
| B C Heating Ltd | Construction | 2017 |
| B P Builders Crawley Limited | Construction | 2007 |
| B&M Tax Accountants LLP | | 2012 |
| B. John Global Limited | Professional & scientific | 2025 |
| B.F. Enterprises Limited | Professional & scientific | 2006 |
| Baby Bacchus Ltd | Hospitality | 2022 |
| Baby Talk Ltd | Education | 2021 |
| BAC Translations Ltd | Professional & scientific | 2015 |
| Back to Bacchus Ltd | Hospitality | 2025 |
| Back to the Grain Ltd | Wholesale & retail | 2012 |
| Backlock Limited | Professional & scientific | 2010 |
| BAD BOY Productions Limited | Information & communication | 2018 |
| BAD Mana Ltd | Information & communication | 2018 |
| Badger Automotive Limited | Wholesale & retail | 2013 |
| Bailey& Ltd | Professional & scientific | 2025 |
| Baker Couriers Limited | Transport & logistics | 2010 |
| Bakers Garden Buildings Ltd | Manufacturing | 2013 |
| Bakers Timber Buildings Ltd | Manufacturing | 2019 |
| Baladgie UK Ltd | Wholesale & retail | 2019 |
| Balanced Ltd | Health & social care | 2004 |
| Balcombe Dairy LLP | | 2018 |
| Balcombe Flooring Limited | Construction | 2019 |
| Balcony Lettings Ltd | Real estate | 2019 |
| Baldock Property Services Limited | Real estate | 2021 |
| Baldwin Estate Management Ltd | Administrative & support | 2025 |
| Balenciaga UK Ltd | Wholesale & retail | 2007 |
| Balfour Secretaries Limited | Extraterritorial | 2004 |
| Banana Marketing Ltd | Professional & scientific | 2026 |
| Bandability Limited | Arts & recreation | 2012 |
| Bangs Brunch and Lunch Limited | Hospitality | 2022 |
| Baraka Baraka Limited | Administrative & support | 2002 |
| Barleycroft Developments Ltd | Real estate | 2023 |
| Barnes Bridge Capital LLP | | 2018 |
| Barnes Bridge Consulting Limited | Professional & scientific | 2023 |
| Barris Roofing Ltd | Construction | 2011 |
| Basdoc Limited | Construction | 2020 |
| Basement Pumps Limited | Construction | 2017 |
| Batch & Thyme Limited | Hospitality | 2020 |
| Batch + Brew Coffee Ltd | Hospitality | 2015 |
| Bawa Forecourts Ltd | Wholesale & retail | 2006 |
| Bay & Bellflower Ltd | Wholesale & retail | 2024 |
| Bayan Investments Limited | Real estate | 2024 |
| Bb&B Holdings Limited | Administrative & support | 2023 |
| BBC Loudspeakers Ltd. | Extraterritorial | 2015 |
| BCE Investments Ltd | Real estate | 2022 |
| BDS Communications Ltd | Information & communication | 2013 |
| BE Hot Studio Ltd | Arts & recreation | 2025 |
| BE Well Spa Ltd | Health & social care | 2026 |
| Beacon Automotive Ltd. | Wholesale & retail | 2014 |
| Beacon Fencing Limited | Manufacturing | 1999 |
| Beacon IR Limited | Financial services | 2020 |
| Bean Family Investments Limited | Financial services | 2025 |
| Beautiful Creations Limited | Professional & scientific | 2020 |
| Beautique Beauty Bar Ltd | Other services | 2025 |
| Beautique Hair and Beauty Bar Ltd | Other services | 2017 |
| Because Partners LLP | | 2013 |
| Becks Limited | Wholesale & retail | 1991 |
| Becksfield Consultants Limited | Information & communication | 2000 |
| Beckura Limited | Real estate | 2020 |
| Becky Woods Coaching Ltd | Professional & scientific | 2025 |
| Bedeaux Ltd | Manufacturing | 2017 |
| Beeletts Ltd | Real estate | 2020 |
| Beers (Consulting Engineers) Limited | Extraterritorial | 1994 |
| Beggingham Palace Estate Ltd | Real estate | 2021 |
| Belfort Drilling Services Ltd | Other services | 2017 |
| Belgrave Electrical Services Limited | Energy | 2003 |
| Believe in Lean Limited | Health & social care | 2023 |
| Bellamie Hair Studio Ltd | Other services | 2012 |
| Belrock Consulting Limited | Professional & scientific | 2022 |
| Belrock Investments Limited | Real estate | 2006 |
| Beltran Associates Limited | Real estate | 2017 |