| 1 Sphere Ltd | Information & communication | 2019 |
| 105 Felixstowe Limited | Real estate | 2010 |
| 12BLESSED Ltd | Manufacturing | 2025 |
| 147 Performance Ltd | Manufacturing | 2022 |
| 23RD Century Logic Limited | Information & communication | 2008 |
| 2WAVE Ltd | Wholesale & retail | 2025 |
| 3MV Services Limited | Transport & logistics | 2019 |
| 3PL Limited | Transport & logistics | 2016 |
| 3RD Party Logistics Ltd | Transport & logistics | 2012 |
| 46 Orwell Road Management Limited | Households | 1999 |
| 6LY Holdings Ltd | Professional & scientific | 2024 |
| 8020 Marketing Systems Limited | Information & communication | 2009 |
| 9 High Beach Management Company Limited | Administrative & support | 2001 |
| 9 Legged Spider Limited | Other services | 2012 |
| A & a Property Maintenance Suffolk Limited | Construction | 2011 |
| A & F Thorne Limited | Agriculture & fishing | 2017 |
| A & H Pharma Ltd | Wholesale & retail | 2022 |
| A & S Recruitment Limited | Administrative & support | 2005 |
| A Hawkins Transport Limited | Transport & logistics | 2013 |
| A R Electrical Services (East Anglia) Ltd | Construction | 2016 |
| A&A Forwarding Limited | Extraterritorial | 2012 |
| A&F Healthcare Ltd | Administrative & support | 2023 |
| A&J Solutions Limited | Administrative & support | 2026 |
| A-Team Rigging Ltd | Information & communication | 2014 |
| A.Plessas Transport Limited | Wholesale & retail | 2017 |
| A1 Ezee Pee-Ze/ Portable Toilets & Site Services Ltd | Construction | 2024 |
| AA Henry Investments Ltd | Real estate | 2022 |
| AA Premier Construction Ltd | Construction | 2025 |
| Aaronfay Marketing Limited | | 1986 |
| Abby Links Ltd | Agriculture & fishing | 2023 |
| Abby RAY Ltd | Professional & scientific | 2025 |
| Abha Foods Ltd | Hospitality | 2019 |
| Able Food Safe Ltd | Professional & scientific | 2020 |
| Abull Forwarding Limited | Transport & logistics | 2009 |
| Account-Wryte Limited | Professional & scientific | 2003 |
| Accountancy Positions Ltd | Administrative & support | 2022 |
| Acesco Business & Property Services LLP | | 2015 |
| ACJ Coastal Developments Ltd | Construction | 2023 |
| ACJ Lettings Ltd | Real estate | 2023 |
| Aclearer Window Ltd | Construction | 2024 |
| ACTIVE24/7 Security UK Ltd | Administrative & support | 2012 |
| AD Astra Human Performance Ltd | Administrative & support | 2021 |
| Adams Family Farms Limited | Agriculture & fishing | 2020 |
| ADD Impact Limited | Extraterritorial | 1995 |
| Addington Construction & Maintenance Ltd | Construction | 2025 |
| Adelaide Bacton Road Ltd | Households | 2016 |
| Adrian Rush Limited | Professional & scientific | 2015 |
| Adscape Gardening Ltd | Administrative & support | 2012 |
| Advanced Aesthetics and Laser Clinic Ltd | Other services | 2025 |
| Advermercial Limited | Information & communication | 2020 |
| AFF Hold Co Limited | Financial services | 2024 |
| Afzal 1 Property Ltd | Real estate | 2021 |
| Afzal Property Limited | Real estate | 2021 |
| Agatrans (Felixstowe) Limited | Transport & logistics | 2015 |
| Agri Cargo Limited | Transport & logistics | 1989 |
| Airtightnessuk Ltd | Construction | 2023 |
| Aite Consulting Ltd | Information & communication | 2018 |
| AJL Music Services Ltd | Arts & recreation | 2022 |
| Ajuk Removals Ltd | Transport & logistics | 2025 |
| Albany Villas Management Company Limited | Hospitality | 1990 |
| Aledumi Limited | Transport & logistics | 2020 |
| Alex Best Trans Ltd | Transport & logistics | 2024 |
| Alex Velocity Transport Ltd | Transport & logistics | 2024 |
| Alexandra Homes Management Ltd | Households | 2020 |
| Alftransporting Limited | Transport & logistics | 2013 |
| Algonquin Developments Limited | Construction | 2020 |
| Alienxshield Ltd | Other services | 2025 |
| Alin Simion Ltd | Transport & logistics | 2019 |
| ALL Saints House Ltd | Construction | 1987 |
| ALL Saints House Trust Ltd | Professional & scientific | 2003 |
| Allpro Carpets and Flooring Ltd | Wholesale & retail | 2020 |
| Alpine Sphere Ltd | Wholesale & retail | 2025 |
| Alston Homes Ltd | Construction | 2006 |
| Alton Trans Ltd | Transport & logistics | 2023 |
| Amari Finance Limited | Professional & scientific | 2024 |
| Amber Home Renovations Ltd | Construction | 2020 |
| Amicable Healthcare Services Ltd | Administrative & support | 2013 |
| AML Transport Ltd | Transport & logistics | 2015 |
| AMPLIO360 Ltd | Professional & scientific | 2020 |
| ANC Transport Ltd | Transport & logistics | 2020 |
| Andmarine Cargo Ltd | Transport & logistics | 2010 |
| Angel 2020 Ltd | Transport & logistics | 2020 |
| Anglia Artistes (UK) Limited | Arts & recreation | 2002 |
| Anglia Container Transport Ltd | Transport & logistics | 2019 |
| Angling Tuition CIC | Health & social care | 2025 |
| Aniode Ltd | Information & communication | 2014 |
| Apex Global Logistics Ltd | Transport & logistics | 2018 |
| APS Andys Plumbing Services Limited | Construction | 2014 |
| Aqua Force Commercial Cleaning Ltd | Administrative & support | 2021 |
| Aqua Force Window Cleaning Ltd | Administrative & support | 2019 |
| Aquabridge Limited | Professional & scientific | 2014 |
| Aquabridge Properties Ltd | Real estate | 2020 |
| Aquila Accountancy Limited | Professional & scientific | 2019 |
| AR Driver Ltd | Transport & logistics | 2017 |
| Aramatransport Ltd | Transport & logistics | 2026 |
| Arclid Green Limited | Professional & scientific | 2010 |
| Ares Berry Limited | Hospitality | 2018 |
| Aristowear Limited | Wholesale & retail | 2025 |
| Arkalie Ltd | Wholesale & retail | 2023 |
| Arrow Tree Services Ltd | Agriculture & fishing | 2014 |