| Allen (Driver) Services Limited | Transport & logistics | 2010 |
| Allen Assured Ltd | Extraterritorial | 2020 |
| Allen Hoole Limited | Professional & scientific | 2017 |
| Allen Project Consulting Limited | Professional & scientific | 2019 |
| Allendale Flats Limited | Households | 1978 |
| Allerdale Management Limited | Households | 1980 |
| Allerton Photography Ltd | Arts & recreation | 2015 |
| Alley Way Studios Limited | Arts & recreation | 2020 |
| Allgosystems Ltd | Information & communication | 2025 |
| Alliance & General Leasing Limited | Administrative & support | 1988 |
| Alliance Design Services Limited | Manufacturing | 1998 |
| Alliance Elite Cleaning Group Ltd | Administrative & support | 2026 |
| Alliance Energy Services Ltd | Construction | 2025 |
| Alliance Engraving & Lettering Co. Limited | Professional & scientific | 1962 |
| Alliance Finance Limited | Financial services | 2014 |
| Alliance Fundraising Limited | Administrative & support | 2024 |
| Alliance Generation Limited | Energy | 1999 |
| Alliance Global Banco Ltd | Financial services | 2022 |
| Alliance Leisure Services Limited | Education | 1992 |
| Alliance of Claims Companies Limited | Other services | 2016 |
| Alliance Portfolio Limited | Construction | 2021 |
| Allied Digital Services (UK) Ltd | Information & communication | 2011 |
| Allied Electrical Services Limited | Construction | 2015 |
| Allied Executive Services Inc Limited | Health & social care | 2012 |
| Allied Geomatics Engineering Limited | Professional & scientific | 2017 |
| Allied Invest Limited | Real estate | 2018 |
| Allied Response Group Limited | Manufacturing | 2026 |
| Allied Surveyors & Valuers Ltd | Professional & scientific | 2009 |
| Allied Surveyors Commercial Ltd | Professional & scientific | 2009 |
| Allied Surveyors Diligence Ltd | Professional & scientific | 1999 |
| Allied West Environmental Consultants Limited | Professional & scientific | 2001 |
| Allike Limited | Wholesale & retail | 2024 |
| Allinam Management Company Limited | Households | 1979 |
| Allis Saga International Limited | Administrative & support | 1999 |
| Allkindsofeverything Ltd | Wholesale & retail | 2018 |
| Alloro Group Ltd | Real estate | 2021 |
| Allotey Living Ltd | Real estate | 2026 |
| Allotey Property Ltd | Real estate | 2026 |
| Allpest Control Limited | Manufacturing | 1980 |
| Allpharm Ltd | Wholesale & retail | 2017 |
| Allpower Group Ltd | Construction | 2022 |
| Allpower Limited | Construction | 1995 |
| Allpress Consulting Services Ltd | Professional & scientific | 2019 |
| Allquest Holdings Ltd | Financial services | 2025 |
| Allround Business Services (UK) Ltd. | Professional & scientific | 2012 |
| Allroundsolutions Bristol Limited | Manufacturing | 2026 |
| Allseasons Gardens Ltd | Administrative & support | 2013 |
| Allsortswholsells Ltd | Wholesale & retail | 2025 |
| Allstack Limited | | 1985 |
| Allstate Properties Investment Ltd | Real estate | 2020 |
| Allstone Paving Ltd | Administrative & support | 2018 |
| Allt Family Holdings Ltd | Real estate | 2019 |
| Allt Family Partnership LLP | | 2019 |
| Allt-Yr-Yn Court & Crescent Residents Association Limited | Households | 2018 |
| Allthree Group Limited | Wholesale & retail | 2026 |
| Alltrade Direct Limited | Wholesale & retail | 2010 |
| Allurion UK Ltd | Professional & scientific | 2021 |
| Allwhere Inc UK Ltd | Information & communication | 2025 |
| Allwood Trading Limited | Wholesale & retail | 2021 |
| Allyance Limited | Professional & scientific | 2006 |
| Alma Bella Limited | Other services | 2016 |
| Alma Build Limited | Construction | 2023 |
| Alma Capital Ltd | Extraterritorial | 2014 |
| Alma Clothing Limited | Wholesale & retail | 2024 |
| Alma House Consulting Limited | Professional & scientific | 2008 |
| Alma Iberica Ltd | Hospitality | 2025 |
| Alma Perfusion Ltd | Health & social care | 2026 |
| Alma Physiotherapy Ltd | Health & social care | 2022 |
| Alma Road (Cheltenham) Management Company Limited | Households | 2025 |
| Alma Theatre Limited | Arts & recreation | 2025 |
| Alma Vale Wealth Management Limited | Financial services | 2013 |
| Alma Woods Bricks Ltd | Wholesale & retail | 2023 |
| Almeda (Holdings) Limited | Other services | 2014 |
| Almeda Facilities Limited | Administrative & support | 2000 |
| Almedina Group Limited | Hospitality | 2017 |
| Almho Limited | Health & social care | 2020 |
| Almizaan Group Ltd | Administrative & support | 2023 |
| Almo Real Estate Ltd | Real estate | 2025 |
| Almond Technology Limited | Hospitality | 2017 |
| Almondsbury Ecoheat Limited | Construction | 2013 |
| Almondsbury Forge Works Limited | Manufacturing | 1980 |
| Almondsbury Homes Limited | Construction | 2014 |
| Almondsbury Interchange Hotels Limited | Hospitality | 1986 |
| Almondsbury Medical Ltd | Health & social care | 2015 |
| Almondsbury Self Build Co-Operative Ltd | Construction | 2018 |
| Almondsbury Window Cleaning Services Ltd | Administrative & support | 2002 |
| Alnajah Tutors Limited | Education | 2024 |
| Alner Hamblin Electronics Limited | Manufacturing | 1987 |
| Alog Ltd | Construction | 2016 |
| Aloha Property Ltd | Real estate | 2020 |
| Alonzo Place Management Company Limited | Households | 2015 |
| Alos Bristol Limited | Professional & scientific | 2018 |
| Alotudo Limited | Health & social care | 2020 |
| ALP England Ltd | Education | 2022 |
| ALP South East (Association of Learning Providers S.E.) | Other services | 2005 |
| Alpan Consultancy Ltd | Professional & scientific | 2016 |
| Alpe Services Ltd | Manufacturing | 2002 |
| Alperton Clark Ltd | Information & communication | 2024 |
| Alpet Holdings Limited | Professional & scientific | 2002 |
| Alpez Property Ltd | Real estate | 2021 |