| HWB Automotive Ltd. | Wholesale & retail | 2017 |
| Hyphen Bloodstock Limited | Professional & scientific | 2010 |
| I.R.D. Landscapes Limited | Administrative & support | 2003 |
| ID & Trace Limited | Agriculture & fishing | 2011 |
| Improved Properties Ltd | Real estate | 2025 |
| Independent Mortgage Advice Bureau (Buckinghamshire) Limited | Financial services | 2006 |
| Inflatesafe Ltd | Manufacturing | 2023 |
| Influence Management Ltd | Professional & scientific | 2020 |
| Integrative Holistic Health East CIC | Health & social care | 2024 |
| International Chemical Consulting Limited | Professional & scientific | 2014 |
| Investor Score Limited | Information & communication | 2025 |
| Iris & BO Limited | Wholesale & retail | 2026 |
| J & R White Property Ltd | Real estate | 2019 |
| J B Davis Plumbing & Heating Limited | Construction | 2007 |
| J H Mobbs Education Ltd | Education | 2021 |
| J K Youngs Occupational Therapy Services Limited | Health & social care | 2012 |
| J Mumford Ltd | Other services | 2023 |
| J R Creasey Ltd | Wholesale & retail | 2014 |
| J W Barrett & Partners Limited | Agriculture & fishing | 2019 |
| Jackalope Arts CIC | Education | 2024 |
| James Tyler Wilson Limited | Construction | 2026 |
| JAW Poultry Limited | Agriculture & fishing | 2025 |
| Jaxons Liberty Limited | Construction | 2025 |
| Jaystone Plumbing & Heating Ltd | Construction | 2023 |
| JC Leisure Advisory Limited | Professional & scientific | 2018 |
| Jcgp Developments Limited | Construction | 2016 |
| JCS (1997) Limited | Wholesale & retail | 2002 |
| JD Autocare Ltd | Wholesale & retail | 2022 |
| JET DRY Limited | Manufacturing | 2024 |
| JIM Coughlan Visual Communications Ltd | Information & communication | 2003 |
| JLA Electrical Ltd | Construction | 2024 |
| JMS Planning & Development Ltd | Public administration | 2015 |
| John Hawkins Holding Co. Limited | Professional & scientific | 1955 |
| John S Barnes Limited | Wholesale & retail | 2015 |
| JRT Production Ltd | Information & communication | 2024 |
| Juddpurs Saddlery Limited | Other services | 2003 |
| JW Salter Consulting Ltd | Professional & scientific | 2024 |
| JXP Ltd | Construction | 2025 |
| K J Trading and Management Limited | Real estate | 2017 |
| K R Glass Fibre Limited | Manufacturing | 2014 |
| K W Clarke Ltd | Wholesale & retail | 2014 |
| Karmafield Limited | Agriculture & fishing | 2005 |
| Kate C Wilde Limited | Education | 2020 |
| Katrina Kingdom Ltd | Wholesale & retail | 2016 |
| Kerslake Construction Employee Ownership Trustee Limited | Financial services | 2021 |
| Kerslake Construction Ltd | Construction | 2004 |
| Kevin Townsend Limited | Construction | 2003 |
| Khaki Design Ltd | Professional & scientific | 2014 |
| Khet Ltd | Real estate | 2020 |
| Kings Landscaping Limited | Wholesale & retail | 2004 |
| Knightsbridge Capital Group Limited | Professional & scientific | 2015 |
| KTB Services Ltd | Administrative & support | 2015 |
| L B Shotter & Sons Limited | Extraterritorial | 2002 |
| L M Surveys Limited | Professional & scientific | 2017 |
| L S Construction (Anglia) Limited | Construction | 2017 |
| L S Properties (Anglia) Limited | Real estate | 2025 |
| L.M. Building Solutions (UK) Ltd | Construction | 2012 |
| Landmark Fencing Limited | Construction | 2021 |
| Lane Eight Ltd | Real estate | 2020 |
| Larkenby Limited | Professional & scientific | 2019 |
| Larks Rise (Halesworth) Limited | Households | 1995 |
| Laurence Edwards EOT Limited | Administrative & support | 2023 |
| Laurence Edwards Limited | Manufacturing | 2015 |
| Leet Hill Farm Limited | Agriculture & fishing | 2015 |
| Leftley and Mann Construction Limited | Construction | 2025 |
| LES Cotton Contractors Limited | Agriculture & fishing | 2004 |
| Lesley Pyke Limited | Manufacturing | 2010 |
| Lewis Barham Limited | Professional & scientific | 2026 |
| Lift Store Suffolk Limited | Wholesale & retail | 2022 |
| Lilia Properties Limited | Real estate | 2007 |
| Linstead Analytics Limited | Administrative & support | 2017 |
| LO and LO Property Limited | Real estate | 2023 |
| Lodge Farm Nurseries Limited | Agriculture & fishing | 2013 |
| Loombest Limited | Agriculture & fishing | 2006 |
| Lucille's Hair Lounge Ltd | Other services | 2025 |
| Lucky Black Cat Ltd | Information & communication | 2011 |
| Lykas Trading Limited | Manufacturing | 2004 |
| M & C Binder Limited | Hospitality | 2006 |
| M a Performance Systems Ltd | Education | 2015 |
| M R King and Sons (Lowestoft) Limited | Wholesale & retail | 1980 |
| M Read Game Limited | Agriculture & fishing | 2019 |
| M Wenham Consulting Ltd | Professional & scientific | 2017 |
| M.R. King & Sons Limited | Wholesale & retail | 1981 |
| Macepark Developments Limited | Real estate | 1987 |
| Make Bake & Brew Limited | Manufacturing | 2015 |
| Marine Instrument Calibration Limited | Manufacturing | 2017 |
| Mark Carter Accountancy Services Limited | Professional & scientific | 2011 |
| Mark Hitchings & Company Limited | Construction | 2004 |
| Market Fields Ltd | Wholesale & retail | 2016 |
| Material Research Limited | Other services | 2020 |
| MAX Southwold Limited | Wholesale & retail | 2021 |
| MB Project Solutions Limited | Professional & scientific | 2023 |
| MCH Landscaping and Design Limited | Administrative & support | 2021 |
| Meadow and Orchard Limited | Agriculture & fishing | 2016 |
| Meadows Eventing Ltd | Agriculture & fishing | 2023 |
| Mehmet CAN Ltd | Hospitality | 2026 |
| Metfield Garage Limited | Wholesale & retail | 2020 |
| Metfield Housing Limited | Real estate | 2016 |
| MGC Services (Established 1989) Ltd | Construction | 2008 |
| Mikaydav Ltd | Wholesale & retail | 2022 |