| Alfa Corporate Finance Limited | Professional & scientific | 2023 |
| Alfa Corporate LLP | | 2023 |
| Alfa Smile Ltd | Health & social care | 2023 |
| Alfasigma UK Limited | Professional & scientific | 1997 |
| Alfehu Services Ltd | Wholesale & retail | 2026 |
| Alfei Co., Ltd | Extraterritorial | 2019 |
| Alforno Cambridge Limited | Hospitality | 2021 |
| Alfresco Potter Ltd | Manufacturing | 2026 |
| Algen Autopoiesis Foundation | Wholesale & retail | 2025 |
| Algerian Adventure Ltd | Administrative & support | 2024 |
| ALI & Farah Limited | Real estate | 2025 |
| ALI & Michelle Enterprises Limited | Financial services | 2024 |
| ALI & Mogul Ltd | Real estate | 2021 |
| ALI Arslan Ltd | Manufacturing | 2020 |
| ALI Sanit Industry Co., Ltd | Manufacturing | 2025 |
| Alia Financial Services Limited | Financial services | 2018 |
| Aliago TM Ltd | Construction | 2022 |
| Aliberta Company Ltd | Manufacturing | 2022 |
| ALICA1987 Ltd | Manufacturing | 2026 |
| Alice Business Consultant Limited | Extraterritorial | 2020 |
| Alice Headhunt Ltd | Administrative & support | 2023 |
| Alicedesignuk Ltd | Wholesale & retail | 2024 |
| Align Medical Ltd | Health & social care | 2024 |
| Alignment Refinement Ltd | Health & social care | 2019 |
| Alilay Ltd | Hospitality | 2026 |
| Alilisa Clothing Co., Ltd | Wholesale & retail | 2023 |
| Alin Aviation Ltd | Manufacturing | 2026 |
| Alin Tecu 22 Ltd | Manufacturing | 2023 |
| Alisan Industry Corporation Limited | Wholesale & retail | 2021 |
| Alison & TIM Limited | Professional & scientific | 2011 |
| Alison Carter Design Ltd | Professional & scientific | 2020 |
| Alison Farmer Associates Ltd | Professional & scientific | 2018 |
| Alithos Limited | Information & communication | 2001 |
| Aliya Food Centre Ltd | Hospitality | 2025 |
| Aliz Kebab Ltd | Hospitality | 2026 |
| Alkamis Ltd | Professional & scientific | 2023 |
| ALL About Hair Mildenhall Ltd | Other services | 2005 |
| ALL Aspects Surfacing Ltd | Construction | 2026 |
| ALL Done Ventures Limited | Real estate | 2024 |
| ALL in Images Limited | Other services | 2024 |
| ALL Parcels Cambridge Limited | Transport & logistics | 2018 |
| ALL Seasons Cakes and Deco Ltd | Wholesale & retail | 2025 |
| ALL Terrain (UK) Limited | Other services | 2017 |
| ALL Winner Limited | Information & communication | 2013 |
| All-Terrain Logistics Ltd. | Agriculture & fishing | 1996 |
| Alladwar Properties Ltd | Real estate | 2021 |
| Allauit Ltd | Real estate | 2021 |
| Allcontrols Limited | Manufacturing | 2003 |
| Allegheny Advisory Services Ltd | Other services | 2023 |
| Allen House Residents Management Company Limited | Households | 2023 |
| Allenby Marketing Limited | Professional & scientific | 2020 |
| Allendarra Limited | Real estate | 2013 |
| Alli Medical Supplies (UK) Ltd. | Wholesale & retail | 2024 |
| Allia Future Business Centres Limited | Real estate | 2018 |
| Allia Impact Limited | Administrative & support | 2018 |
| Alliance Asbestos Services Limited | Construction | 2008 |
| Alliance Business Management Ltd | Professional & scientific | 2022 |
| Alliance for Microsimulation and Policy Analysis CIC | Education | 2024 |
| Alliance Francaise DE Cambridge | Education | 2002 |
| Alliance Power Industry Co., Ltd. | Extraterritorial | 2014 |
| Allied Building Partnership Ltd | Construction | 2011 |
| Allied Medicine Ltd | Professional & scientific | 2023 |
| Allied Projects Industry Limited | Extraterritorial | 2011 |
| Allied Psychotherapy Ltd | Health & social care | 2022 |
| Allinoscar Ltd | Manufacturing | 2026 |
| Allison 1956 Limited | Extraterritorial | 2013 |
| Allium Gardeners Ltd | Administrative & support | 2010 |
| Allium Independence Limited | Health & social care | 2012 |
| Allknown Ltd | Other services | 2023 |
| Allula Ltd | Households | 2020 |
| Allum Consultancy Ltd | Professional & scientific | 2024 |
| Alluring Nails & Tanning Limited | Other services | 2007 |
| Allvet Ltd | Information & communication | 2003 |
| Almaro Property Ltd | Real estate | 2021 |
| Almicats Ltd | Information & communication | 2019 |
| Almost Coding Limited | Information & communication | 2020 |
| Aloha Bidco Limited | Financial services | 2024 |
| Aloha Midco Limited | Financial services | 2024 |
| Aloha Topco Limited | Administrative & support | 2024 |
| Aloms Home Limited | Real estate | 2019 |
| Alot International Group Co., Ltd | Extraterritorial | 2014 |
| Alpha Biopesticides Limited | Manufacturing | 2011 |
| Alpha Cafe Ltd | Hospitality | 2023 |
| Alpha Cars (Cambridge) Limited | Transport & logistics | 2016 |
| Alpha Chemical Industry Limited | Extraterritorial | 2018 |
| Alpha CRC Limited | Professional & scientific | 1987 |
| Alpha D Ltd | Construction | 2019 |
| Alpha Enterprise Solutions Limited | Professional & scientific | 2024 |
| Alpha Flat Roofing Ltd | Construction | 2018 |
| Alpha Investment Office Limited | Financial services | 2024 |
| Alpha Properties (Cambridge) Limited | Real estate | 2022 |
| Alpha Real Estate Ltd | Real estate | 2020 |
| Alpha Roofing Cambridge Ltd | Construction | 2011 |
| Alpha Shield Security Limited | Administrative & support | 2026 |
| Alpha Terrace Limited | Construction | 2022 |
| Alpha Zulu Records Ltd | Wholesale & retail | 2018 |
| Alphabetmedium Ltd | Extraterritorial | 2014 |
| Alpharhou Ltd | Professional & scientific | 2026 |
| Alphasense Trustee Limited | Extraterritorial | 2014 |
| Alphaswap Ltd | Information & communication | 2017 |