| JLF Medical Ltd | Health & social care | 2018 |
| JLS Groundworks & Construction Ltd | Manufacturing | 2024 |
| Jmre Limited | Wholesale & retail | 2021 |
| John Ryder Removals Ltd | Transport & logistics | 2011 |
| Jolly Junction Limited | Arts & recreation | 2024 |
| JPF Technical Ltd | Professional & scientific | 2016 |
| JTT Carpentry Ltd | Manufacturing | 2024 |
| K D Graphics Limited | Professional & scientific | 2022 |
| K R Roofing Ltd | Construction | 2026 |
| K S Enterprising Ltd | Wholesale & retail | 2026 |
| K. Crowe & Sons Limited | Administrative & support | 2013 |
| Karan Group Properties UK Ltd | Construction | 2025 |
| Kardiostar Ltd | Professional & scientific | 2009 |
| Katana Braves Ltd | Manufacturing | 2016 |
| Katharos Ltd | Wholesale & retail | 2025 |
| KBS Norfolk Ltd | Wholesale & retail | 2018 |
| KBTV1 Media Limited | Information & communication | 2017 |
| Kerbside Kitchen (Cromer) Ltd | Hospitality | 2025 |
| Kerbside Kitchen (North Walsham) Ltd | Hospitality | 2025 |
| Kerbside Trailers UK Ltd | Wholesale & retail | 2025 |
| Kevin Page Development Consultancy Ltd | Construction | 2010 |
| KHE Ltd | Hospitality | 2020 |
| King & Gale Electrical Limited | Construction | 2026 |
| King & Gale Holdings Limited | Financial services | 2026 |
| Kings Arms Leisure Limited | Hospitality | 2018 |
| Kingshead Developments Limited | Construction | 2025 |
| Kitchen-Quip Ltd | Wholesale & retail | 2012 |
| KJW Electrical Limited | Construction | 2011 |
| Kong's Fish & Chips Ltd | Hospitality | 2023 |
| Koru Therapeutic and Educational Services Ltd | Education | 2022 |
| KSD Associates Limited | Professional & scientific | 2003 |
| L E Electrical Limited | Wholesale & retail | 1998 |
| L. & V. Prior Limited | Construction | 1984 |
| Lake Accountancy Limited | Professional & scientific | 2023 |
| Lakeside Food Group Limited | Wholesale & retail | 1989 |
| Lambert Civil Engineering Limited | Construction | 2017 |
| Lamont Energy Services Limited | Professional & scientific | 2018 |
| Landowners Group Limited | Extraterritorial | 2010 |
| Launch Access Ltd | Wholesale & retail | 2021 |
| Lavender House Advisory UK Ltd | Professional & scientific | 2025 |
| Lawson Construction & Plant Limited | Construction | 2014 |
| Lbgi Limited | Financial services | 2017 |
| Lbmb Ltd | Financial services | 2024 |
| LBW Therapies Limited | Health & social care | 2017 |
| LCG Wealth Ltd | Professional & scientific | 2024 |
| LCP Hospitality Limited | Hospitality | 2024 |
| Leadpost Limited | Construction | 1983 |
| Learn and Play East Anglia Ltd | Education | 2024 |
| Learning Universal Academy Limited | Information & communication | 2024 |
| Lenwoods Limited | Administrative & support | 1997 |
| Liberi Solutions Ltd | Professional & scientific | 2013 |
| Lich Games Ltd | Wholesale & retail | 2025 |
| Lion Attachments Ltd | Wholesale & retail | 2025 |
| LK Bespoke Home Improvements Ltd | Manufacturing | 2024 |
| LKG Properties Ltd | Real estate | 2019 |
| LL Paradise Limited | Arts & recreation | 2016 |
| Ll.London.Cleaning.Services Ltd | Administrative & support | 2026 |
| LMJ Trading Ltd | Other services | 2019 |
| Local Electrical Ltd | Professional & scientific | 2015 |
| Locento Ltd | Manufacturing | 2022 |
| Lockhart-Cator Limited | Wholesale & retail | 2015 |
| Longbow Space Technologies Ltd | Manufacturing | 2024 |
| Lost Account Finder Limited | Other services | 2020 |
| Louis Potts Marketing Ltd | Professional & scientific | 2026 |
| Lowdown Transporters Ltd | Manufacturing | 2018 |
| LS Equipment Leasing Limited | Other services | 2018 |
| LSD Property Management Ltd | Real estate | 2020 |
| Luke Beales Management Ltd | Professional & scientific | 2025 |
| Luna Plaster Ltd | Construction | 2023 |
| Lunar Glow Ltd | Real estate | 2018 |
| Lund Design Ltd | Professional & scientific | 2023 |
| LVT Property Ltd | Real estate | 2025 |
| M & B Thatchers | | 2008 |
| M & N Horticulture Limited | Administrative & support | 2005 |
| M & T Precision Limited | Manufacturing | 2003 |
| M a Property (Norfolk) Limited | Construction | 2011 |
| M K Andrews Concrete Pumping Limited | Manufacturing | 2009 |
| M. Edge Solutions Ltd | Construction | 2022 |
| M.G. Laws (Properties) Ltd | Hospitality | 2006 |
| M.K.G. Limited | Construction | 1988 |
| MAB Consultancy (Norfolk) Limited | Construction | 2016 |
| Machinetech Ltd | Wholesale & retail | 2025 |
| Made in Italy Motorcycles Limited | Wholesale & retail | 2009 |
| Magnolia Property Solutions Ltd | Real estate | 2025 |
| Magnus Marine Limited | Manufacturing | 2002 |
| Maker Store Limited | Wholesale & retail | 2021 |
| Mango Solutions (East) Limited | Real estate | 2021 |
| Mango Stay Limited | Real estate | 2022 |
| Manzie Limited | Health & social care | 2024 |
| Maran Cleaning Limited | Administrative & support | 2022 |
| Margaritaville Limited | Administrative & support | 2025 |
| Marxphoto Ltd | Professional & scientific | 2013 |
| Mason Slade Accident & Health Ltd | Financial services | 2001 |
| Master & Disciple Ltd | Extraterritorial | 2016 |
| Matrix College of Counselling and Psychotherapy Ltd | Education | 2002 |
| Matsumoku Guitar and Bass Ltd | Manufacturing | 2021 |
| Matt Wood Design Ltd | Professional & scientific | 2023 |
| Matthew Tunmore Services Limited | Administrative & support | 2023 |
| MAX Media Global Ltd | Information & communication | 2022 |
| MBT Commercial Ltd | Construction | 2022 |