| 1 Gunton Cliff Management Company Ltd | Households | 2004 |
| 1 Stop HSE Training Limited | Education | 2014 |
| 12 Kendal RD & 22 Wilson RD Management Company Limited | Households | 2006 |
| 121 Communications (Lowestoft) Limited | Other services | 2023 |
| 12A Kirkley Cliff Road Limited | Households | 2025 |
| 142 Cafe & Cocktails Limited | Hospitality | 2023 |
| 15 Kirkley Cliff (Lowestoft) Management Company Limited | Households | 2024 |
| 17 Property Developments Ltd | Households | 2023 |
| 178-184 Blackstock Road Management Limited | Households | 2005 |
| 2 Consultants Ltd | Professional & scientific | 2024 |
| 2 Nightingale Road (1993) Limited | Real estate | 1993 |
| 3 Ohms Ltd | Manufacturing | 2005 |
| 3-8 Old School Court Management Company Limited | Households | 2017 |
| 30 Suffolk Road Management Company Limited | Households | 2021 |
| 303 Projects CIC | Arts & recreation | 2021 |
| 360 Renovations & Builders Ltd | Construction | 2022 |
| 360 ST John Street Limited | Households | 2002 |
| 3D Printing Express Limited | Manufacturing | 2025 |
| 3DGT LLP | | 2024 |
| 3V3 UK Norfolk and North Suffolk Ltd | Education | 2023 |
| 3VO Ltd | Financial services | 2024 |
| 4TH and Fifteen Productions Ltd | Information & communication | 2025 |
| 62-76 ST. Peters Street Lowestoft Management Company Limited | Households | 2014 |
| 68A Colville Road Limited | Real estate | 2024 |
| 68B Colville Road Limited | Real estate | 2024 |
| 7-12 Alwyne Mansions Freehold Limited | Households | 2017 |
| 744 Investments Limited | Real estate | 2021 |
| 8 Gorleston Road Management Company Limited | Hospitality | 2004 |
| 9 & 10 Camperdown Freehold Co Limited | Real estate | 2016 |
| A & a Hiles & Sons Ltd | Extraterritorial | 2019 |
| A & a Wood Limited | Professional & scientific | 2012 |
| A & C East Catering Limited | Hospitality | 2015 |
| A & C Logistics (EA) Ltd | Information & communication | 2013 |
| A & G Cars Limited | Wholesale & retail | 2018 |
| A & K Woodgate Limited | Construction | 2003 |
| A Beamish Limited | Construction | 2002 |
| A Group (Anglia) Limited | Other services | 2010 |
| A Hill Electrical Contracting Limited | Construction | 2012 |
| A J Builders (Suffolk) Limited | Construction | 2011 |
| A J Properties Suffolk Ltd | Real estate | 2023 |
| A Middleton Carpentry Limited | Construction | 2016 |
| A Piece of Cake Foods Limited | Hospitality | 2010 |
| A R Blowers Ltd | Wholesale & retail | 2016 |
| A.& E.Cooke(Farmers)Limited | Agriculture & fishing | 1946 |
| A.P.L. Design Limited | Professional & scientific | 1990 |
| A1 Ironworks Limited | Manufacturing | 2007 |
| A1 Property Preservation (E.A.) Limited | Construction | 1998 |
| A2B Partnership LLP | | 2024 |
| A2Z Dampproofing Ltd | Construction | 2020 |
| A2ZDAMPCONTROL Limited | Construction | 2022 |
| AA and S Holdings Limited | Wholesale & retail | 2026 |
| AAP Scaffolding Limited | Construction | 2006 |
| AB UK Solutions Ltd | Professional & scientific | 2010 |
| Abbotts Developments Ltd | Real estate | 2021 |
| Abbotts Property Lettings Ltd | Real estate | 2021 |
| AC Roberts Plasterers Limited | Construction | 2009 |
| ACA Resource Management Ltd | Transport & logistics | 2022 |
| Acanthus Health Care Limited | Health & social care | 2011 |
| Acceptus Healthcare Limited | Health & social care | 2011 |
| Access Plastering Ltd | Construction | 2016 |
| Accountancy Solutions (MBC) Limited | Professional & scientific | 2006 |
| Ace Stone Fabrications Limited | Manufacturing | 2025 |
| Acorn Target Systems Ltd | Manufacturing | 2002 |
| ACT Electrical Services Ltd | Professional & scientific | 2017 |
| ACT Electrical Solutions Limited | Construction | 2025 |
| Acute Consulting Engineers Limited | Professional & scientific | 2017 |
| AD Pope Vehicle Repairs Ltd | Wholesale & retail | 2020 |
| Adam Bagley Financial Planning Ltd | Financial services | 2018 |
| Adam Tallamy Ltd | Professional & scientific | 2017 |
| Adams Cleaning Contractors UK Ltd | Administrative & support | 2020 |
| Adams Contracts & Building Services Ltd | Construction | 2018 |
| Adande Aircell Limited | Manufacturing | 2019 |
| Adande Refrigeration Limited | Manufacturing | 2017 |
| ADL Writing Agency Ltd | Professional & scientific | 2020 |
| ADP UK Group Ltd | Hospitality | 2018 |
| Adrian Court Management Company (North) Limited | Households | 1992 |
| Adrian Court Management Company (South) Limited | Households | 1991 |
| Advance Underwriting Limited | Administrative & support | 1998 |
| Advanced Properties (EA) Ltd | Real estate | 2026 |
| Adydye Consulting Ltd | Transport & logistics | 2026 |
| AEJL68 Ltd | Hospitality | 2014 |
| AEP Global Limited | Professional & scientific | 2019 |
| AEW Consultancy Ltd | Professional & scientific | 2014 |
| Afrina BD Suffolk UK Ltd | Wholesale & retail | 2024 |
| AG Elec Tech Limited | Construction | 2024 |
| AG Marine Ltd | Transport & logistics | 2018 |
| AG Property Services EA Ltd | Manufacturing | 2022 |
| AGH PUB Limited | Hospitality | 2023 |
| AGM Decorating Limited | Construction | 2017 |
| AGM Welding Limited | Construction | 2025 |
| Agnelo Marine Services Ltd | Agriculture & fishing | 2025 |
| Agoe Heating Services Ltd. | Construction | 2024 |
| AGP Pipework Services Limited | Professional & scientific | 2024 |
| AI by Design Limited | Information & communication | 2023 |
| Aim-To-Train Ltd | Education | 2009 |
| Ainscough Consultancy Ltd | Professional & scientific | 2011 |
| AJ Plumbing & Heating (Norfolk) Ltd | Construction | 2018 |
| AJK Property Improvement Services Limited | Construction | 2019 |
| AKB 2000 Limited | Wholesale & retail | 2012 |
| Akcadag Cleaning Services Ltd | Administrative & support | 2020 |