| Josh Parker Ltd | Wholesale & retail | 2026 |
| JR Atkinson and Company Ltd | Real estate | 2026 |
| JRB Plastering Ltd | Construction | 2016 |
| Julian Barclay Ltd | Construction | 2000 |
| K V Medical Aesthetics Ltd | Other services | 2021 |
| Kelsale Hall Shoot Ltd | Agriculture & fishing | 2020 |
| Kimolian Community CIC | Education | 2025 |
| Kinohaku Rentals Ltd | Real estate | 2025 |
| Kiwi Services (East Anglia) Limited | Wholesale & retail | 2012 |
| KND Services Ltd | Transport & logistics | 2021 |
| Knodishall Food & Wine Ltd | Wholesale & retail | 2024 |
| KYN Space Ltd | Hospitality | 2024 |
| KYN Wellbeing Ltd | Health & social care | 2025 |
| L.A.F. Construction Ltd | Construction | 2017 |
| L.S. Hammond Limited | Construction | 2010 |
| Ladybird Nurseries (Snape) Limited | Agriculture & fishing | 2016 |
| Lagonda Club Limited | Wholesale & retail | 1987 |
| Land Communication Ltd | Professional & scientific | 2014 |
| Langley Dairies Limited | Agriculture & fishing | 2018 |
| Lawson's Delicatessen Limited | Wholesale & retail | 2022 |
| LE Bris Beauty and Wellness Ltd | Other services | 2025 |
| Leiston Court Freehold Limited | Households | 2004 |
| Leiston Veterinary Clinic Limited | Professional & scientific | 2008 |
| LFI Flooring Limited | Construction | 2021 |
| Lilaro Ltd | Information & communication | 2025 |
| Little Lane Dairy Ltd | Wholesale & retail | 2026 |
| Locality Matters Ltd | Professional & scientific | 2011 |
| Locri Ltd | Administrative & support | 2020 |
| Love Music Ltd | Arts & recreation | 2017 |
| Love Property Agency Ltd | Households | 2026 |
| LS Flooring (East Anglia) Limited | Construction | 2012 |
| LSH Contracting Ltd | Information & communication | 2020 |
| LT Contractors Limited | Construction | 2004 |
| LY Red Limited | Hospitality | 2023 |
| M.J.Knights Plumbing & Heating Ltd | Administrative & support | 2016 |
| Mago Estates Limited | Real estate | 2026 |
| Mailprofiler Technology Solutions UK Ltd. | Information & communication | 2004 |
| Mann Power Ltd | Financial services | 2025 |
| Manningandco Ltd | Professional & scientific | 2024 |
| Manor Farm Renewables Ltd | Financial services | 2025 |
| Marine Conservation for Norfolk Action Group CIC | Professional & scientific | 2022 |
| Mark NOË Mortgage and Protection Limited | Financial services | 2017 |
| Martin & Howe Developments Ltd | Extraterritorial | 2015 |
| Martin Salter & Co Limited | Administrative & support | 2025 |
| Martyn Flint Carpentry and Building Services Ltd | Construction | 2019 |
| Massagical Limited | Wholesale & retail | 2017 |
| Masterminding Ltd | Extraterritorial | 2015 |
| Material Exchange Ventures Limited | Information & communication | 2022 |
| Maximus Sustainable Fishing Limited | Wholesale & retail | 2008 |
| Maybrook Management Limited | Real estate | 2002 |
| Maypole Brickwork & Construction Ltd | Construction | 2017 |
| MBS Accountancy Services Ltd | Professional & scientific | 2015 |
| Meadow Brook Playcare | Education | 2008 |
| Megalucks Limited | Arts & recreation | 2025 |
| Melbek Technology Limited | Information & communication | 2005 |
| MGM RAD Limited | Professional & scientific | 2019 |
| Michael Strowger Professional Painting Contractor Limited | Construction | 2011 |
| Michael Tollemache Fine Art Limited | Wholesale & retail | 2010 |
| Midlands Core Cutters Ltd | Construction | 2015 |
| Mills & Davies Ltd | Manufacturing | 2023 |
| Mindtune Therapeutic Services Limited | Health & social care | 2023 |
| Mlbfs Limited | Administrative & support | 2026 |
| Mobbs Architects Ltd | Professional & scientific | 2021 |
| Molgrand Limited | Administrative & support | 1998 |
| Molly Burdett Limited | Arts & recreation | 2023 |
| Moore's Yard Limited | Real estate | 2002 |
| MPB1 Ltd | Information & communication | 2021 |
| MR Rumley RUG Equestrian Products and Crafts Ltd | Wholesale & retail | 2017 |
| N G Personal Services Ltd | Transport & logistics | 2019 |
| Next Path Media Ltd | Professional & scientific | 2023 |
| Niche Consulting (Midlands) Limited | Professional & scientific | 2003 |
| Nichi-Ei Link Limited | Professional & scientific | 1998 |
| Nick Verebelyi Property Ltd | Real estate | 2010 |
| Nightingale Close (Knodishall) Property Management Limited | Households | 2026 |
| Nomadic Wisdom Ltd | Professional & scientific | 2023 |
| Nonsuch Logistics Ltd | Transport & logistics | 2026 |
| Noop Limited | Extraterritorial | 2014 |
| Nordsoft Limited | Information & communication | 2001 |
| Norfolk & Suffolk Properties Ltd | Hospitality | 2021 |
| Norfolk Country Properties Limited | Real estate | 2008 |
| Nova Scotia Farms Limited | Agriculture & fishing | 1954 |
| Nova Scotia Holdings Limited | Financial services | 2024 |
| Nova Scotia Renewables Ltd | Energy | 2025 |
| Npgl Limited | Real estate | 2017 |
| Occq Holdings | Financial services | 2018 |
| Office Easy Ltd | Administrative & support | 2022 |
| OJR Ltd | Wholesale & retail | 2024 |
| Olivia Dental Staffing Solutions Ltd | Administrative & support | 2024 |
| OLS Holdings Limited | Professional & scientific | 2016 |
| Omnis Software Ltd | Information & communication | 1980 |
| Opyney Ltd | Real estate | 2025 |
| Orchard-Lisle Wines Ltd | Wholesale & retail | 2018 |
| Original Thing Ltd | Professional & scientific | 2015 |
| Original Works Ltd | Wholesale & retail | 2022 |
| Orr-Head Ltd | Real estate | 2020 |
| Osbourn House Management Company Limited | Real estate | 2006 |
| Other Brother Studios Ltd | Information & communication | 2018 |
| Outpost 9 Ltd | Information & communication | 2017 |
| OWL Farm Holdings | Financial services | 2018 |
| P & S Holdings (East Anglia) Ltd | Real estate | 2021 |