| Albatross Cafe Ltd | Hospitality | 2017 |
| Albea Dental Limited | Health & social care | 2024 |
| Albedo 1 Limited | Information & communication | 2006 |
| Albereck Ltd | Wholesale & retail | 2023 |
| Albert AZ Ltd | Wholesale & retail | 2018 |
| Albert E. James & SON Holdings Limited | Financial services | 2017 |
| Albert E.James & SON Limited | Manufacturing | 1962 |
| Albert General Building Ltd. | Construction | 2016 |
| Albert Lodge Limited | Real estate | 1998 |
| Albert Management Company Limited | Real estate | 2002 |
| Albert Michler Distillery INT. Ltd | Wholesale & retail | 2015 |
| Albert Mill Management Company Limited | Households | 1989 |
| Albert Palmer Photography Ltd | Professional & scientific | 2012 |
| Albert Road (Bristol) Management Company Limited | Real estate | 2002 |
| Alberto Hernández Studio Ltd | Arts & recreation | 2023 |
| Alberto Takeaway Ltd | Hospitality | 2026 |
| Alberton Court Freehold Limited | Households | 2019 |
| Albi Equestrian Ltd | Manufacturing | 2017 |
| Albian Property Limited | Real estate | 2018 |
| Albias Ltd | Wholesale & retail | 2022 |
| Albington LP | | 2015 |
| Albion Asset Group Limited | Real estate | 2025 |
| Albion Chambers (Bristol) Limited | Administrative & support | 2018 |
| Albion Eco Pro Ltd | Wholesale & retail | 2022 |
| Albion Group Ltd | Real estate | 2023 |
| Albion Healthcare (Doncaster) Holdings Limited | Health & social care | 2002 |
| Albion Healthcare (Doncaster) Limited | Health & social care | 2002 |
| Albion Healthcare (Oxford) Holdings Limited | Real estate | 2001 |
| Albion Healthcare (Oxford) Limited | Health & social care | 2001 |
| Albion-Roofing (SW) Ltd | Extraterritorial | 2025 |
| Alboran Social Club Ltd | Information & communication | 2026 |
| Albotherm Ltd | Professional & scientific | 2020 |
| Albright Court RTM Company Ltd | Households | 2026 |
| Albrighton Battery Storage Limited | Energy | 2023 |
| Albryn Environmental Ltd | Professional & scientific | 2026 |
| Albu 2017 Limited | Transport & logistics | 2017 |
| Albuhera Management Limited | Professional & scientific | 2021 |
| ALC Worgan Holdings Limited | Real estate | 2019 |
| Alcatel-Lucent Centro Caribbean Holding Limited | Administrative & support | 2009 |
| Alcester Tyres Ltd | Other services | 2016 |
| Alchemise Capital Limited | Administrative & support | 2022 |
| Alchemist Ventures Limited | Extraterritorial | 2004 |
| Alchemy Creative Limited | Professional & scientific | 2026 |
| Alchemy Gifts Ltd | Wholesale & retail | 2022 |
| Alchemy Hub Ltd | Professional & scientific | 2023 |
| Alchemy of Ageing Ltd | Health & social care | 2023 |
| Alchemy of Mindset Ltd | Professional & scientific | 2025 |
| Alchemy Project Services Limited | Other services | 2009 |
| Alchemy Projects South West Ltd | Construction | 2018 |
| Alchimie Limited | Administrative & support | 2008 |
| Alcinus Solutions Ltd | Information & communication | 2019 |
| Alco Fast Ltd | Wholesale & retail | 2019 |
| Alcoa Services UK Limited | Professional & scientific | 2025 |
| ALCOHOUSE1 Ltd | Wholesale & retail | 2026 |
| Alcombe Tandoori 4U Ltd | Hospitality | 2022 |
| Alcor Networks Bristol Limited | Administrative & support | 2024 |
| Alcoroo Ltd | Transport & logistics | 2016 |
| ALD Automotive Group Limited | Administrative & support | 1995 |
| ALD Automotive Limited | Administrative & support | 1970 |
| ALD Carpentry Ltd | Manufacturing | 2024 |
| Aldam Shelley Limited | Administrative & support | 2017 |
| Aldelo Ltd | Real estate | 2023 |
| Alder Landscaping Ltd | Administrative & support | 2020 |
| Alder Productions Ltd | Information & communication | 2015 |
| Alderbrook Road Residents Association Limited | Households | 1986 |
| Alderman Electrical Services Ltd | Construction | 2026 |
| Aldermans Park Management Company Limited | Households | 2004 |
| Alderney Middleton Productions Limited | Information & communication | 2026 |
| Alders Heath Management Company Limited | Households | 1984 |
| Aldgate HIT Ltd | Hospitality | 2025 |
| Aldgate Investment Limited Partnership | | 2007 |
| Aldgate TAP Limited | Hospitality | 2014 |
| Aldha LLP | | 2007 |
| Aldhelm Rise Properties Limited | Households | 2023 |
| Aldinga Consulting Limited | Administrative & support | 2007 |
| Aldo's Barbershop Ltd | Other services | 2018 |
| Aldomus Property Investment Ltd | Real estate | 2019 |
| Aldtec Ltd | Information & communication | 2012 |
| Aldwick Estate Limited | Wholesale & retail | 2004 |
| Aldwick Events Limited | Hospitality | 2025 |
| Aldwick Farm Partnership LLP | | 2025 |
| Aldwick Wine Limited | Manufacturing | 2025 |
| ALE Developments Limited | Real estate | 2007 |
| Alec French Architects Limited | Extraterritorial | 2005 |
| Alec Jarrett Land Limited | Agriculture & fishing | 2016 |
| Alec Jarrett Limited | Manufacturing | 1962 |
| Alecci Construction Ltd | Construction | 2011 |
| Alef Care Ltd | Health & social care | 2018 |
| Alek Enhancements Ltd | Wholesale & retail | 2013 |
| Alek Grill Limited | Hospitality | 2017 |
| Alero Shika Limited | Administrative & support | 2025 |
| Aleskafe Ltd | Administrative & support | 2025 |
| Alessio Riccobono Ltd | Health & social care | 2024 |
| Aleston Homes Property Group Ltd | Construction | 2026 |
| Alethia Talent Limited | Administrative & support | 2024 |
| Aletto Furniture Limited | Manufacturing | 2025 |
| Alex Car Electric and Mechanical Ltd | Wholesale & retail | 2019 |
| Alex & Lumy Ltd | Transport & logistics | 2017 |
| Alex Barker Consulting Ltd | Information & communication | 2019 |
| Alex Barker Properties Ltd | Real estate | 2024 |