| AKN Labs Limited | Information & communication | 2006 |
| Akoris Trading Limited | Financial services | 2012 |
| Akpsr Professional Ltd | Health & social care | 2022 |
| Akrish Consulting Ltd | Information & communication | 2018 |
| Akwaflow Limited | Professional & scientific | 2026 |
| AL Casbah Cambridge Ltd | Hospitality | 2021 |
| AL Chile Limited | Hospitality | 2014 |
| AL Composites Ltd | Manufacturing | 2023 |
| AL Couture Limited | Other services | 2008 |
| AL Geophysics Limited | Professional & scientific | 2024 |
| AL Maaly Cambridge Education Ltd | Education | 2024 |
| AL Palmyra Limited | Wholesale & retail | 2018 |
| AL Pomodoro D Ltd | Wholesale & retail | 2025 |
| AL Pomodoro Ltd | Hospitality | 2019 |
| AL Transfo Design Group Ltd | Extraterritorial | 2013 |
| AL Waahid Ltd | Wholesale & retail | 2025 |
| AL Watin Trading Co., Ltd | Wholesale & retail | 2023 |
| AL Wesal Trading Co., Ltd | Transport & logistics | 2023 |
| Al-Ibriz Ltd | Professional & scientific | 2023 |
| Al-Ostora Trading Co., Limited | Wholesale & retail | 2023 |
| AL1LA Limited | Information & communication | 2023 |
| Alacati Yachting Ltd | Other services | 2026 |
| Alacer Software Limited | Information & communication | 2005 |
| Alacer Technical Services Limited | Information & communication | 2022 |
| Alacramed Limited | Professional & scientific | 2015 |
| Alaizah Limited | Manufacturing | 2025 |
| Alamin Media Ltd | Professional & scientific | 2019 |
| Alan Johnson CAD Services Limited | Information & communication | 2011 |
| Alan Naylor Consultancy Limited | Professional & scientific | 2009 |
| Alan Thomson Simulation Limited | Information & communication | 2019 |
| Alan Turing Talent Foundation | Extraterritorial | 2025 |
| Alanbuki Urological Services Limited | Health & social care | 2017 |
| Alarm Maintenance Cambridge Limited | Construction | 2020 |
| Alarms of Cambridge Limited | Construction | 2020 |
| Alaukik Limited | Information & communication | 2023 |
| Alawco Limited | Professional & scientific | 2021 |
| ALB1 Plumbing Heating & Electric Ltd | Manufacturing | 2024 |
| Alba Holdings (Cambridge) Limited | Real estate | 2006 |
| Alban Patent Services LP | | 2010 |
| Albanwise Environment Limited | Professional & scientific | 2021 |
| Albanwise Farming Limited | Agriculture & fishing | 2006 |
| Albanwise Holdings Limited | Financial services | 2021 |
| Albanwise Insurance Services Limited | Financial services | 1980 |
| Albanwise Limited | Agriculture & fishing | 1978 |
| Albanwise Synergy Limited | Real estate | 2019 |
| Albanwise Wallace Estates Limited | Financial services | 2019 |
| Albany and Connaught Works Management Company Limited | Households | 2003 |
| Albany Facade Engineering Ltd | Construction | 2013 |
| Albany Park Residents Company Limited | Households | 1986 |
| Albany Regulatory Consulting Limited | Hospitality | 2005 |
| Albert International School Ltd | Education | 2024 |
| Albertine Rift Conservation Society | Professional & scientific | 2000 |
| Albion Drug Discovery Services Ltd | Professional & scientific | 2022 |
| Albion Exotics Limited | Wholesale & retail | 2024 |
| Albion Innovations UK Limited | Professional & scientific | 2005 |
| Albion Shortform Limited | Information & communication | 2025 |
| Alboro Developments Limited | Wholesale & retail | 1960 |
| Alboro Energy Ltd | Energy | 2019 |
| Alboro Holdings Limited | Financial services | 2007 |
| Albus Technologies Limited | Information & communication | 2023 |
| Alchemix Limited | Professional & scientific | 2020 |
| Alchera Data Technologies Ltd | Information & communication | 2016 |
| Alchin Property Ltd | Real estate | 2016 |
| Alcock Investments Limited | Construction | 1988 |
| Alconbury Tech Ltd | Information & communication | 2026 |
| Aldaloo Co., Ltd | Wholesale & retail | 2020 |
| Aldane Limited | Extraterritorial | 2022 |
| Alderstone International Advisory Ltd | Information & communication | 2025 |
| Aldhouse & Smith Ltd | Transport & logistics | 2005 |
| Aldous House Management Company Limited | Households | 1988 |
| Aldrich & Co Limited | Administrative & support | 1994 |
| Alea Leisure Ltd | Hospitality | 2025 |
| Aleluia Aircraft Technical Maintenance Services Ltd | Manufacturing | 2024 |
| Alemba Limited | Information & communication | 2007 |
| Alemba Topco Limited | Information & communication | 2014 |
| Aleph One Limited | Professional & scientific | 1971 |
| Alessandro Balletto Aviation Ltd | Manufacturing | 2023 |
| Alessandro DI Ruscio Ltd | Information & communication | 2018 |
| Alessandro Grasso Ltd | Manufacturing | 2026 |
| Aletheia Technologies Limited | Information & communication | 2024 |
| Alevin Therapeutics Limited | Professional & scientific | 2022 |
| Alex Arthurs Building Services Limited | Construction | 2016 |
| Alex Beckett Photography Limited | Professional & scientific | 2013 |
| Alex Food Limited | Real estate | 2013 |
| Alex Rius Consultants Limited | Professional & scientific | 2024 |
| Alex Valve&Control Ltd | Manufacturing | 2025 |
| Alexander Clarke Limited | Real estate | 2009 |
| Alexander Greens Property Services Ltd | Real estate | 2009 |
| Alexandra Newman Ltd | Professional & scientific | 2011 |
| Alexandra's Tanning & Beauty Clinic Ltd | Other services | 2019 |
| Alexandru Aviation Ltd | Manufacturing | 2025 |
| Alexandru GTT Ltd | Manufacturing | 2024 |
| Alexandru Oprea Ltd | Manufacturing | 2024 |
| Alexandru Tetu Ltd | Manufacturing | 2026 |
| Alexandruavionics Ltd | Manufacturing | 2025 |
| Alexhugianu Ltd | Other services | 2022 |
| Alexia Maintenance Ltd | Manufacturing | 2026 |
| Alexion Pharma UK Limited | Administrative & support | 2006 |
| Alexpaint Ltd | Manufacturing | 2025 |
| Alexsap Ltd | Manufacturing | 2025 |