| 00573478 Limited | | 1956 |
| 0058D Limited | Manufacturing | 2016 |
| 121MOTORBIKESALES Limited | Wholesale & retail | 2018 |
| 24 24 Ltd | Extraterritorial | 2013 |
| 247UNICARE Access Limited | Health & social care | 2025 |
| 26/27/27A ST. Mary's Square Newmarket Management Limited | Households | 1983 |
| 32STRIPES Ltd | Professional & scientific | 2022 |
| 360 ARW Limited | Health & social care | 2016 |
| 365 Remarketing Limited | Wholesale & retail | 2023 |
| 4EVER Home Rentals Limited | Real estate | 2018 |
| 528 Music Global Ltd | Arts & recreation | 2019 |
| 555 Business Ltd | Wholesale & retail | 2019 |
| 6 Ltd | Extraterritorial | 2025 |
| 61-65 Mirabel Road RTM Company Limited | Households | 2017 |
| 88 High Street Burwell Limited | Households | 2019 |
| A & G Home Improvements Limited | Construction | 2003 |
| A & S Building & Landscaping Limited | Administrative & support | 2024 |
| A 2 Z Transportation Ltd | Transport & logistics | 2024 |
| A Brand Builders Ltd | Construction | 2022 |
| A Hardwick Haulage Limited | Transport & logistics | 1998 |
| A J Canning Roofing Ltd | Construction | 2006 |
| A J S Architecture Ltd | Professional & scientific | 2017 |
| A M Electrical Services (Newmarket) Ltd | Construction | 2003 |
| A Mallyon Construction Limited | Construction | 2023 |
| A New Delivery Company Ltd | Professional & scientific | 2025 |
| A&F Building Services Ltd | Construction | 2002 |
| A&Mh Limited | Health & social care | 2020 |
| A-Works Limited | Construction | 2026 |
| A. W. Potatoes Ltd | Agriculture & fishing | 2016 |
| A.J.N. (Holdings) Ltd | Extraterritorial | 2014 |
| A.J.N. Steelstock Ltd. | Wholesale & retail | 1961 |
| A.L.N Bespoke Homes Limited | Construction | 2025 |
| A.L.N Contract Lifting Limited | Construction | 2025 |
| A.L.N Homes Limited | Construction | 2025 |
| A.L.N Portfolio Limited | Real estate | 2018 |
| A.T.L. Agricultural Technology Limited | Manufacturing | 1980 |
| A2F Associates Limited | Administrative & support | 2013 |
| Aamr Dessert Limited | Hospitality | 2025 |
| Aamr Foods Limited | Hospitality | 2025 |
| Abacus Cards Limited | Manufacturing | 1991 |
| Abbey Garden & Landscaping Ltd | Construction | 2019 |
| Abbeyvale Builders Limited | Construction | 1995 |
| Abcproducts.Co.Uk Ltd | Wholesale & retail | 2008 |
| ABI Exning Stores Limited | Wholesale & retail | 2011 |
| Ability Plus Limited | Professional & scientific | 2011 |
| Abimco Virtual Limited | Professional & scientific | 2023 |
| ABJ PUB Company Ltd | Hospitality | 2025 |
| Absolute Fire Safety Ltd | Construction | 2018 |
| Absolute Growth Ltd | Professional & scientific | 2020 |
| Absolute Holding Group Ltd | Financial services | 2026 |
| Absolute Property Repairs Ltd | Construction | 2023 |
| Abuchin Limited | Administrative & support | 2024 |
| AC Exec Limited | Administrative & support | 2016 |
| Accio TX Biobank Online Ltd | Professional & scientific | 2021 |
| Accio V Biobank Online Ltd | Professional & scientific | 2021 |
| Acclaimed Castings Ltd | Administrative & support | 2019 |
| Accounds Ltd | Professional & scientific | 2025 |
| Accountabilityplus Limited | Professional & scientific | 2007 |
| ACD Projects Ltd | Construction | 2011 |
| Ace Stud Ltd | Agriculture & fishing | 2024 |
| Acies Counselling Services Ltd | Other services | 2020 |
| ACT Therapeutics Ltd | Professional & scientific | 2020 |
| Action Trading Ltd | Manufacturing | 2010 |
| AD Magic Media Limited | Professional & scientific | 2013 |
| Adam Curtis Dwcf Limited | Manufacturing | 2014 |
| Adam LEE Plastering Limited | Construction | 2015 |
| Adam Parker Interiors Limited | Construction | 2024 |
| Adams & Eden Restoration Limited | Construction | 2025 |
| Adamson Fisher Limited | Other services | 2022 |
| ADC Cleaning Limited | Administrative & support | 2009 |
| Adult Preemie Advocacy Network CIC | Information & communication | 2023 |
| Advanced Coating Systems Limited | Manufacturing | 2024 |
| Aegis Alpha Limited | Professional & scientific | 2024 |
| Aelion Technologies Limited | Manufacturing | 2025 |
| AGA Utilities Management Services Ltd | Construction | 2025 |
| Agency Signs Limited | Other services | 1998 |
| Agile Consulting Guru Ltd | Professional & scientific | 2021 |
| Agilee Innovations Ltd | Information & communication | 2024 |
| Agricultural Technology Limited | Professional & scientific | 1998 |
| AGS Lake Limited | Financial services | 2024 |
| AGT (NKT) Limited | Agriculture & fishing | 2024 |
| Ahlquist Limited | Wholesale & retail | 2008 |
| AHP Design Limited | Professional & scientific | 2017 |
| Aida Strategic Consulting Ltd | Professional & scientific | 2023 |
| AIM Stitches Limited | Other services | 2018 |
| Air Motorcycles Limited | Wholesale & retail | 2020 |
| Airport Integrated Services Limited | Construction | 2014 |
| AIS Mechanical Limited | Financial services | 2026 |
| Aislabie Bloodstock Limited | Agriculture & fishing | 2007 |
| AJ Business Solutions Ltd | Wholesale & retail | 2026 |
| AJB Fidelis Group Ltd | Professional & scientific | 2019 |
| AJG Waste Solutions Ltd | Water & waste | 2020 |
| Ajiil Human Capital Ltd | Administrative & support | 2019 |
| Ajilis Consulting Ltd | Professional & scientific | 2026 |
| AJS Developments (Isleham) Ltd | Real estate | 2020 |
| Ajwa Delights Limited | Wholesale & retail | 2025 |
| AK Scaffolding Limited | Construction | 2018 |
| Akay Ltd | Hospitality | 2017 |
| Akeso Coaching Network Community Interest Company | Education | 2021 |
| AL Asayl Bloodstock Ltd | Arts & recreation | 2012 |