| Hollow Tree Construction Limited | Construction | 2023 |
| Hollow Tree Homes Limited | Real estate | 2023 |
| Hollyman Automotive Limited | Wholesale & retail | 2012 |
| Hollyman Catering Ltd | Hospitality | 2025 |
| Horners 1890 LLP | | 2008 |
| Horners LLP | | 2003 |
| Hosnui Limited | Wholesale & retail | 2026 |
| Howbro Motors Ltd | Wholesale & retail | 2020 |
| Hughes-Payne Ltd | Professional & scientific | 2022 |
| Hungry Lions Creative Ventures Ltd | Information & communication | 2021 |
| Hunt' Nseek Limited | Arts & recreation | 2016 |
| HW Property Invest Ltd | Hospitality | 2022 |
| IAN Baird Welding Repairs Limited | Manufacturing | 2008 |
| IAN Marjoram Ltd | Construction | 2007 |
| Iceni Ecology Limited | Construction | 2014 |
| Industrial Building Maintenance & Repair Ltd | Construction | 2025 |
| Inspired Change Limited | Professional & scientific | 2009 |
| Instromet Weather Systems Limited | Manufacturing | 2010 |
| Isotope Precision Limited | Manufacturing | 2006 |
| IT Geeks Ltd | Wholesale & retail | 2023 |
| Itrade Recycling Ltd | Wholesale & retail | 2022 |
| Iucad Ltd | Wholesale & retail | 2025 |
| IVY Farm Christmas Trees and Events Limited | Agriculture & fishing | 2025 |
| J and D Papworth Limited | Wholesale & retail | 2000 |
| J.A. Paterson & Co. Limited | Agriculture & fishing | 1952 |
| J.W. Buxton Haulage Limited | Transport & logistics | 1975 |
| JJS Empowerment CIC | Education | 2026 |
| JK Building Maintenance Services Ltd | Manufacturing | 2022 |
| John Paterson (Dilham) Limited | Professional & scientific | 1947 |
| Johnson & Newall Ltd | Professional & scientific | 2023 |
| Johnson Electrical (North Walsham) Limited | Construction | 2013 |
| JRC Strategies Limited | Wholesale & retail | 2025 |
| JRS Broadland Ltd | Wholesale & retail | 2021 |
| Kalimatain Limited | Administrative & support | 2015 |
| Kaone Limited | Real estate | 2000 |
| Karzen Auto House Ltd | Wholesale & retail | 2026 |
| Kate Leith Garden Design Limited | Administrative & support | 2004 |
| KAYHAN24 Ltd | Hospitality | 2024 |
| KDM Health & Safety Ltd | Professional & scientific | 2014 |
| Kelly Clarke Motor Services Limited | Wholesale & retail | 2002 |
| Ken's Traditional Fish & Chips Ltd | Hospitality | 2014 |
| Kieron Williamson Limited | Arts & recreation | 2010 |
| Kinetic Renewables Group UK & Europe Limited | Construction | 2025 |
| Kipey Productions Limited | Information & communication | 2021 |
| Kirk Property Group Ltd | Real estate | 2020 |
| Kisi Canine Accessories Limited | Wholesale & retail | 2018 |
| Kitale Cafe Ltd | Hospitality | 2026 |
| KMJ Developments Limited | Construction | 2017 |
| Knapton House Management Limited | Households | 1972 |
| KST Consulting Ltd | Professional & scientific | 2025 |
| Kudos Building Services Ltd | Construction | 2012 |
| L.Watts Construction Ltd | Construction | 2017 |
| Laksd Ltd | Wholesale & retail | 2025 |
| LAN Projections Limited | Extraterritorial | 2012 |
| Laplace Instruments Limited | Manufacturing | 1988 |
| Larksong Clinical Limited | Financial services | 2024 |
| Last Pack Collectables Ltd | Wholesale & retail | 2026 |
| Laura London Coaching Limited | Other services | 2025 |
| LDS Transportation Ltd | Transport & logistics | 2025 |
| LEE West Plumbing & Heating Ltd | Construction | 2015 |
| Lewis Williams (Farming) Limited | Agriculture & fishing | 1977 |
| Lily's Tearoom Limited | Hospitality | 2013 |
| Liquid ICT Limited | Information & communication | 2024 |
| Little Ants Childcare Ltd | Health & social care | 2025 |
| Little Green Button Limited | Information & communication | 2018 |
| LJK Holdings Ltd | Financial services | 2023 |
| LJSTORES17 Ltd | Wholesale & retail | 2024 |
| Lltr Limited | Hospitality | 2025 |
| London House (Norfolk) Limited | Real estate | 2018 |
| Lowthers Gardening Services Ltd | Administrative & support | 2018 |
| Lubbock Place Management Company Limited | Real estate | 2009 |
| Ludham Carpets Limited | Construction | 2011 |
| Lujo Projects Ltd | Construction | 2025 |
| LWF 2 Limited | Professional & scientific | 2004 |
| LY Copywriting Ltd. | Professional & scientific | 2018 |
| Lynbeth Properties Limited | Real estate | 2018 |
| M. Rivett Motors Ltd | Wholesale & retail | 2000 |
| M.J.D. Transport Ltd | Transport & logistics | 2025 |
| Managed Property Supply Limited | Real estate | 1996 |
| Marine & Industrial Sealants Limited | Professional & scientific | 1992 |
| Mark 1 Tyre and Exhaust Centre Ltd | Wholesale & retail | 2012 |
| Market Plaice Chippy Ltd | Hospitality | 2025 |
| Marshgate Irises Ltd | Agriculture & fishing | 2013 |
| Matthew Williams Digger Hire Limited | Construction | 2008 |
| Me-Ev Ltd | Health & social care | 2025 |
| Mediate Property Ltd | Professional & scientific | 2023 |
| Mikes Animal Feed Limited | Wholesale & retail | 2018 |
| Mindcom Investments Limited | Financial services | 2011 |
| Mindcom Media Limited | Information & communication | 2009 |
| Minutia Limited | Wholesale & retail | 2023 |
| Mistybay Limited | Hospitality | 2003 |
| MK Developments Norfolk Ltd | Construction | 2026 |
| MO Design Solutions Limited | Information & communication | 2005 |
| Mobile Flash Solutions Ltd | Wholesale & retail | 2024 |
| Moore & Masters Ltd | Arts & recreation | 2007 |
| Moore Enterprise Ltd | Wholesale & retail | 2025 |
| Morston Mussels Ltd | Agriculture & fishing | 2014 |
| Muir Properties Limited | Real estate | 1962 |
| Musco Holiday Lettings Limited | Hospitality | 2025 |
| Musco Property Limited | Real estate | 2023 |