| A Learning Place Ltd | Education | 2022 |
| A Listair (London) Company Limited | Extraterritorial | 2003 |
| A M Alarm Maintenance Ltd | Construction | 2005 |
| A M Challis Trust Ltd | Arts & recreation | 2008 |
| A Metalheads Kind of Sauce Ltd | Manufacturing | 2018 |
| A Moise Auto Ltd | Manufacturing | 2025 |
| A Peachey Developments Limited | Construction | 2015 |
| A R Hyde & Co Ltd | Professional & scientific | 2010 |
| A Rose Life Ltd | Wholesale & retail | 2025 |
| A Tempo Group Ltd | Health & social care | 2022 |
| A Thoft Consultancy Limited | Construction | 2020 |
| A Tiwary Ltd | Health & social care | 2022 |
| A to Z Tools Mart Ltd | Wholesale & retail | 2019 |
| A W Phillips Engineering LLP | | 2021 |
| A Ward Roofing Ltd | Construction | 2025 |
| A Williams Electrical Ltd | Construction | 2022 |
| A&A Importexport Ltd | Wholesale & retail | 2023 |
| A&E Johnston Ltd | Health & social care | 2019 |
| A&E Seafoods Co., Limited | Manufacturing | 2025 |
| A&H Media Group Ltd | Information & communication | 2022 |
| A&I Pristine Cleaning Ltd | Administrative & support | 2026 |
| A&L Technics Ltd | Manufacturing | 2025 |
| A&P Hacienda Holdings Ltd | Real estate | 2026 |
| A&T Taxis Ltd | Transport & logistics | 2024 |
| A-Red Machinery International Co., Ltd | Extraterritorial | 2018 |
| A-Smart Technology Limited | Wholesale & retail | 2025 |
| A-Stars Estates Ltd | Real estate | 2022 |
| A-Team Locum Limited | Wholesale & retail | 2023 |
| A-Tech Consulting Ltd | Other services | 2010 |
| A. Bothwell Plant Hire Ltd. | Administrative & support | 2004 |
| A. Chan Properties LLP | | 2024 |
| A. Creed Engineering Ltd | Manufacturing | 2025 |
| A. K. Foods (Cambridge) Ltd. | Wholesale & retail | 2011 |
| A.A. Taylor General Builders Limited | Construction | 2002 |
| A.G. & P.A. Collacott Limited | | 1977 |
| A.G. Sewell Limited | Real estate | 1988 |
| A.G.W.Fordham & Son(Ixworth)Limited | Real estate | 1964 |
| A.I. Agents Ltd | Information & communication | 2017 |
| A.I.M Plant Operators Ltd | Construction | 2020 |
| A.J. DEW Ltd | Manufacturing | 2024 |
| A.J. Read Upholstery Limited | Other services | 2014 |
| A.J. Rogers Building Limited | Construction | 2004 |
| A.M.A. Developments Limited | Construction | 1984 |
| A.M.S. Biotechnology (Europe) Limited | Professional & scientific | 1987 |
| A.P. Compton Tiling Limited | Construction | 2018 |
| A.R.H Aircraft Maintenance Ltd | Manufacturing | 2019 |
| A.S. Barzey Limited | Real estate | 2025 |
| A.S.D.Alderton & Co.Limited | Construction | 1972 |
| A.T.H. Cambridge Limited | Education | 2009 |
| A.W. Mellish Limited | Professional & scientific | 1982 |
| A1 Cabco Taxis Limited | Transport & logistics | 2015 |
| A1 Car Sales Cambridge Ltd | Wholesale & retail | 2018 |
| A1 Hand Car Wash Cambridge Ltd | Wholesale & retail | 2022 |
| A1 Ltd | Extraterritorial | 2021 |
| A1 Roberts Properties Limited | Construction | 2008 |
| A1 UK Drains Limited | Construction | 2008 |
| A123 Systems Ltd. | Manufacturing | 2024 |
| A22Z Limited | Construction | 2020 |
| A2B Motorcycle Movers Ltd | Transport & logistics | 2013 |
| A2D Barbershop Limited | Other services | 2021 |
| A2ND Investments Limited | Real estate | 2024 |
| A2Z Education Consultancy Ltd | Education | 2026 |
| A3I Systems Private Limited | Information & communication | 2025 |
| A5 Taxis Ltd | Transport & logistics | 2023 |
| AA Renovation Services Limited | Manufacturing | 2022 |
| AA Spring Ltd | Hospitality | 2023 |
| AAA Legal Associates Limited | Professional & scientific | 2020 |
| Aaaq Ltd | Hospitality | 2024 |
| AAB Research Ltd | Professional & scientific | 2022 |
| AAC and Co Consulting Ltd | Professional & scientific | 2020 |
| Aadenric Limited | Real estate | 2020 |
| AAE Drylining Limited | Construction | 2026 |
| AAF Catering Ltd | Hospitality | 2024 |
| Aafaq UK Ltd | Education | 2018 |
| AAG Insurance Services Limited | Financial services | 2016 |
| Aahar Junction Ltd | Hospitality | 2023 |
| AAJ Sultan Ltd | Manufacturing | 2025 |
| AAK Khan Limited | Real estate | 2025 |
| Aallele Ltd | Professional & scientific | 2024 |
| Aalmeida Ltd | Manufacturing | 2026 |
| AAO Web & AI Solutions Ltd | Extraterritorial | 2025 |
| Aaraiz Enterprises Ltd | Wholesale & retail | 2025 |
| Aarikiki Ltd | Information & communication | 2024 |
| Aatechdiag Ltd | Wholesale & retail | 2020 |
| AB Civil Service Ltd | Construction | 2025 |
| AB Construction (Cambs) Limited | Construction | 2025 |
| AB Integrated Solutions Ltd | Construction | 2025 |
| AB Marine Ltd | Manufacturing | 2017 |
| AB Marketing Services Limited | Professional & scientific | 2009 |
| Ab-Uk Limited | Education | 2023 |
| ABA Commercial Services Ltd | Financial services | 2015 |
| Ababil for Multi a Actives Trdading Co., Ltd | Wholesale & retail | 2024 |
| Abacus Business Consultants Limited | Professional & scientific | 2012 |
| Abacus Day Nursery Ltd | Education | 2008 |
| Abak Ltd | Real estate | 2019 |
| Abandoned Souls Ltd | Wholesale & retail | 2023 |
| Abba M Ltd | Professional & scientific | 2025 |
| Abbas Trading Co., Ltd | Manufacturing | 2023 |
| Abberley Wood Services Limited | Real estate | 2006 |
| Abbexa Capital Ltd | Financial services | 2019 |