| 123 Accounts Ltd | Administrative & support | 2020 |
| 1662 Enterprises Limited | Real estate | 2016 |
| 1ST 4 UK Mortgages Ltd | Financial services | 2019 |
| 20TWENTY Productions CIC | Arts & recreation | 2011 |
| 24/7 Sales Tool Ltd | Information & communication | 2022 |
| 2CATARTS Limited | Manufacturing | 2014 |
| 2WG Holdings Ltd | Financial services | 2025 |
| 3 Taste Ltd | Hospitality | 2025 |
| 4 County Commercial Interiors Limited | Construction | 2025 |
| 42 Ventures Ltd | Administrative & support | 2023 |
| 55 Above Ltd | Manufacturing | 2014 |
| 92 Lets Ltd | Real estate | 2024 |
| A & K Fink Limited | Construction | 2018 |
| A Banks Limited | Wholesale & retail | 2011 |
| A D Novus Limited | Wholesale & retail | 2022 |
| A E Catering Limited | Hospitality | 2007 |
| A&E Animal Medical Services Ltd | Professional & scientific | 2021 |
| A&M JV Property Limited | Real estate | 2025 |
| A. D. Sutton Motor Engineers Ltd | Wholesale & retail | 2009 |
| A. Jeffries Recruitment Limited | Administrative & support | 2013 |
| A4 Plus Limited | Professional & scientific | 2000 |
| AAP Group Ltd | Professional & scientific | 2020 |
| AC & BS Ltd | Wholesale & retail | 2017 |
| AC Tech Partners Ltd | Other services | 2025 |
| Academia Genius Limited | Education | 2024 |
| Academy Events Ltd | Arts & recreation | 2012 |
| Acole Plumbing Services Limited | Construction | 2004 |
| Acorn Lettings Ltd | Real estate | 2020 |
| AD Bodies Engineering Ltd | Wholesale & retail | 2020 |
| Adam Smith Haulage Ltd | Transport & logistics | 2018 |
| Adam's Tyre & MOT Centre Limited | Wholesale & retail | 2017 |
| Added Security Systems Ltd | Administrative & support | 2024 |
| Adept Property Solutions Limited | Construction | 2007 |
| Advantage Performance Ltd | Professional & scientific | 2023 |
| Aedile Consulting Limited | Information & communication | 2017 |
| AEM Electrical Services Ltd | Energy | 2014 |
| AG Civils (March) Ltd | Construction | 2022 |
| AH Car Sales Limited | Wholesale & retail | 2020 |
| Airnite Limited | Information & communication | 1992 |
| Airt Audio Ltd. | Wholesale & retail | 2014 |
| AJ & EJ Clark Ltd | Real estate | 2025 |
| AJ Engineerservice Ltd | Manufacturing | 2025 |
| AJB Servicing Solutions Limited | Other services | 2017 |
| AJD Engineering Cover Limited | Professional & scientific | 2024 |
| AJF Studios Ltd | Information & communication | 2023 |
| AJS Farming Limited | Construction | 2001 |
| Alchera Ltd | Professional & scientific | 2017 |
| Alex the Barber Ltd | Other services | 2024 |
| Alexander Regulatory Consulting Limited | Professional & scientific | 2025 |
| ALL Saints Inter-Church Academy | Education | 2013 |
| Almaris Properties Ltd | Real estate | 2021 |
| Alpha Capital (March) Ltd. | Real estate | 2020 |
| ALS Property Consultants Ltd | Construction | 2025 |
| Alstons Confectionery LLP | | 2025 |
| Amani Reservations Limited | Administrative & support | 2008 |
| Amber Moon Bookkeeping Limited | Professional & scientific | 2023 |
| Andrei F Ltd | Professional & scientific | 2017 |
| Andrew Brooks Limited | Construction | 2006 |
| Andy Page Angling Coach Ltd | Arts & recreation | 2025 |
| Angels Estates Limited | Professional & scientific | 2011 |
| Anglia Aquatics Limited | Wholesale & retail | 2018 |
| Anglian Care and Domestic Support Services Limited | Health & social care | 2014 |
| ANJ Roofing Limited | Construction | 2014 |
| Annex Energy Limited | Professional & scientific | 1987 |
| AO Renewd Ltd | Professional & scientific | 2022 |
| Apache A.H. Engineering Ltd | Manufacturing | 2023 |
| Arkanet Limited | Professional & scientific | 2015 |
| Arthur Park Management Ltd | Administrative & support | 2018 |
| Artificial Grass (Cambridge) Limited | Administrative & support | 2012 |
| Artisau Luxury Candles Ltd | Manufacturing | 2024 |
| Aruna Healthcare Consultancy Ltd | Public administration | 2024 |
| AS Estate & FM Ltd | Real estate | 2026 |
| Ashvim Logistics and Events Ltd | Transport & logistics | 2026 |
| Asia Fresh Resources Ltd | Wholesale & retail | 2023 |
| Aspired Assets Group Limited | Real estate | 2020 |
| Astraea Bidco Limited | Professional & scientific | 2020 |
| Astraea Topco Limited | Professional & scientific | 2020 |
| Attrill Construction Ltd | Construction | 2023 |
| Aurora Angling Ltd | Wholesale & retail | 2020 |
| AV Mortgage Solutions Ltd | Financial services | 2024 |
| Averymonk Ltd | Construction | 2013 |
| AWA Haulage Ltd | Transport & logistics | 2020 |
| AWA Invest Ltd | Real estate | 2025 |
| Awesomesap Limited | Professional & scientific | 2010 |
| AYA Dance Ltd | Arts & recreation | 2023 |
| B&R Dining Ltd | Hospitality | 2016 |
| B2B Source Ltd | Wholesale & retail | 2024 |
| Backlog & Beyond Ltd | Information & communication | 2025 |
| Barneo Industrial Wipes Ltd | Manufacturing | 2020 |
| Barnes & Onions Ltd | Real estate | 2025 |
| Baseline Surveying Limited | Construction | 2008 |
| Batchelor Carpenters Limited | Construction | 2004 |
| Batchelor Developments Limited | Construction | 2001 |
| Baxter Construction Group Limited | Construction | 2025 |
| BDP Social Care Ltd | Health & social care | 2013 |
| Beau Toxicology Ltd | Other services | 2018 |
| Beauty & Hair for ALL Ltd | Other services | 2026 |
| Being ME Education Ltd | Education | 2024 |
| Belnivon Ltd | Wholesale & retail | 2025 |
| Beth's Plot Ltd | Information & communication | 2025 |