| (Dawson) T/A Diamond Clean Ltd | Administrative & support | 2014 |
| 101 Electrical Ltd | Construction | 2022 |
| 11 and a Half Ltd | Information & communication | 2021 |
| 13TH Door Ltd | Information & communication | 2019 |
| 151 Consulting Ltd | Professional & scientific | 2023 |
| 19 High Street, ST Neots Ltd | Extraterritorial | 2014 |
| 19 Salisbury Road Freehold Limited | Real estate | 2014 |
| 2 TON Productions Limited | Arts & recreation | 2012 |
| 2020 Highways Ltd | Other services | 2023 |
| 2020 Traffic Management Ltd | Other services | 2020 |
| 23 High Street Ltd | Real estate | 2017 |
| 26 Oxford Grove Management Company Limited | Households | 2004 |
| 2D6 Ltd | Information & communication | 2010 |
| 36 & 38 Birch Trees Road Management Company Limited | Real estate | 2016 |
| 444 Lincoln Road (EN3) Freehold Ltd | Households | 2023 |
| 6 King's Road Management Company Limited | Real estate | 1996 |
| 80 Stone Hill RTM Company Limited | Households | 2024 |
| 98 Cazenove Road Management Company Limited | Households | 1985 |
| A & L Davis Services Limited | Manufacturing | 2025 |
| A J S Healthcare Consulting Ltd | Health & social care | 2003 |
| A M King Services Ltd | Construction | 2019 |
| A N Carpentry Contracting Ltd | Construction | 2018 |
| A N Property Ltd | Real estate | 2020 |
| A W J U (Management) Ltd | Real estate | 2010 |
| A&B Capital Ltd | Financial services | 2024 |
| A.F.A. Planning (Agriculture) Limited | Professional & scientific | 2012 |
| A.M. Sessions Ltd | Arts & recreation | 2015 |
| A.N. Audio Limited | Wholesale & retail | 1985 |
| A.W.J.Usher & Sons Limited | Construction | 1965 |
| A1 Catering Engineers Ltd. | Professional & scientific | 2015 |
| A1 Chimney Stove Installations Ltd | Construction | 2021 |
| A1 Lifestyle Accounts Ltd | Professional & scientific | 2009 |
| A1 Lifestyle Book-Keeping Ltd | Financial services | 2005 |
| Aaa+Services Limited | Construction | 2026 |
| AAM Rental Management Ltd | Administrative & support | 2018 |
| Abbie Rail Limited | Administrative & support | 2011 |
| Abbotsley Ltd | Hospitality | 1986 |
| Abbotswood Gardeners & Designers Limited | Administrative & support | 2014 |
| ABC Life Support C.I.C. | Education | 2011 |
| ABP Architectural Services Ltd | Professional & scientific | 2010 |
| Absolute SIP Extentions Limited | Construction | 2023 |
| Absolute Warm Roofs and Studios Limited | Construction | 2022 |
| AC Accountancy Ltd | Professional & scientific | 2015 |
| Acara Naturals Limited | Wholesale & retail | 2026 |
| Accessgp Ltd | Health & social care | 2025 |
| Accountancy Gems Limited | Professional & scientific | 2009 |
| Accoya Properties Limited | Real estate | 2024 |
| Accrista Property Ltd | Real estate | 2021 |
| Ace Auto Works Ltd | Manufacturing | 2014 |
| Ace Building Services Ltd | Construction | 2018 |
| Ace Property Maintenance Services Ltd | Construction | 2017 |
| Acer Consultants Limited | Professional & scientific | 2015 |
| Acey Developments Ltd | Construction | 2021 |
| ACG Scaffolding Services Ltd | Construction | 2026 |
| Achieve Occupational Therapy Ltd | Health & social care | 2015 |
| Achr Ltd | Administrative & support | 2022 |
| Acorn Professional Tutors Limited | Education | 2003 |
| ACT Multi Academy Trust | Education | 2011 |
| Actc Investments Ltd | Real estate | 2026 |
| Active Food Systems Limited | Manufacturing | 1999 |
| Activisehealth Ltd | Information & communication | 2026 |
| AD Health Consulting Ltd | Information & communication | 2023 |
| Adlams LLP | | 2008 |
| Admiral Car Washes Ltd | Other services | 2017 |
| Adoty Services Ltd | Other services | 2018 |
| ADP Fire and Security Limited | Administrative & support | 2015 |
| ADR Care Homes Limited | Health & social care | 2002 |
| Advertising Online Limited | Administrative & support | 1999 |
| Aelecto Limited | Professional & scientific | 2005 |
| Aemm Painting & Services. Limited | Construction | 2024 |
| Aeroflex Automotive Limited | Wholesale & retail | 2024 |
| Aerotech Management Ltd | Extraterritorial | 2024 |
| AFK Foods Ltd | Hospitality | 2017 |
| AG Projekt Ltd | Professional & scientific | 2014 |
| Agile Project Coaching Ltd | Information & communication | 2016 |
| AGP Global Ltd | Financial services | 2022 |
| Agraradler Ltd | Extraterritorial | 2020 |
| Agro Business Consortia Limited | Real estate | 2011 |
| Agush Ltd | Hospitality | 2019 |
| Aimserv Limited | Professional & scientific | 2025 |
| Aivisonas Transport Ltd | Extraterritorial | 2015 |
| AJJ Premises Ltd | Real estate | 2014 |
| AJS Communications Ltd | Professional & scientific | 2018 |
| Aksaray Emre Limited | Hospitality | 2023 |
| Alan Carroll Crane Services Ltd | Construction | 2021 |
| Alana Donnachie Ltd | Professional & scientific | 2025 |
| Alarmsmiths Limited | Administrative & support | 2008 |
| Alas Retail Ltd | Wholesale & retail | 2024 |
| Alben Homes Ltd | Construction | 2026 |
| Alcon Cibeg Global Limited | Health & social care | 2025 |
| Alconbury Lawn Care Ltd | Other services | 2022 |
| Alden Care Group Ltd | Health & social care | 2026 |
| Alfred Court (Cambridge) Residents' Association Ltd | Hospitality | 1996 |
| Alfresco Agencies Ltd | Wholesale & retail | 2015 |
| Alice Health Limited | Professional & scientific | 2025 |
| Aliz Food Packaging Ltd | Manufacturing | 2021 |
| ALL Aspects Air Conditioning Limited | Construction | 2023 |
| ALL Inclusive Football Coaching CIC | Arts & recreation | 2024 |
| ALL Makes Fence Ltd | Agriculture & fishing | 2020 |
| Allwright for Hair Limited | Other services | 2024 |