| J J & C a S Davies Limited | Agriculture & fishing | 2006 |
| J T P Amusements Ltd | Arts & recreation | 2008 |
| J.H LEE Ltd | Agriculture & fishing | 2015 |
| Jaymic Workshops Limited | Wholesale & retail | 2004 |
| JCW Consulting Limited | Professional & scientific | 2022 |
| Jeagor Leisure Ltd | Agriculture & fishing | 2023 |
| Jensen and Co Mortgage Brokers Ltd | Financial services | 2026 |
| Jetstar Music Ltd | Extraterritorial | 2012 |
| Jetstar Recordings Ltd | Information & communication | 2016 |
| Jetstar Records Ltd | Information & communication | 2016 |
| JFJ Consumables Limited | Wholesale & retail | 2012 |
| JK Media Agency Ltd | Information & communication | 2025 |
| JM Consultants Limited | Administrative & support | 2023 |
| Jonas Seafood Limited | Manufacturing | 2004 |
| Josh.Biz (UK) Limited | Information & communication | 2012 |
| Jsjo Consultancy Limited | Arts & recreation | 2024 |
| Jumping Jack Splash Limited | Education | 2015 |
| Juniper Landscapes & Gardening Limited | Administrative & support | 2018 |
| K T Health Limited | Health & social care | 2006 |
| K-Konsult Limited | Professional & scientific | 2003 |
| Karttrak Cromer Limited | Arts & recreation | 2017 |
| Keith Rounce Site Management Services Limited | Administrative & support | 2011 |
| Key Chiropractic Limited | Health & social care | 2010 |
| KGM Holdings Limited | Real estate | 2015 |
| Kingswear Court Management Company (Lowestoft) Limited | Households | 2009 |
| Kingswear Flats Limited | Households | 1988 |
| Kiran Arkala Ltd | Health & social care | 2011 |
| Know More Languages Ltd | Education | 2023 |
| Laboratory Media Education CIC | Education | 2019 |
| Lady Matilda's Dog Grooming Ltd | Professional & scientific | 2023 |
| Lakeside Newbuild Ltd | Construction | 2018 |
| Lancing Commercial Contractors Ltd | Construction | 2012 |
| Laurel Farm Barns Management Company Limited | Households | 2026 |
| Leonis Ltd | Professional & scientific | 2002 |
| Leslei Flint Management Company Limited | Real estate | 2004 |
| Let's Go Campervan-Ing Limited | Hospitality | 2020 |
| Let’S Dink UK Ltd | Arts & recreation | 2025 |
| Liberalitas Ltd | Professional & scientific | 2020 |
| Life Caddy Limited | Professional & scientific | 2017 |
| Linkside Management Company Limited | Households | 1985 |
| Ljas Enterprises Ltd | Other services | 2019 |
| London Youth Cards Ltd | Wholesale & retail | 2025 |
| Londs Consulting Ltd | Professional & scientific | 2017 |
| Lords Opticians Ltd | Health & social care | 2008 |
| LOS Establos Ltd | Real estate | 2020 |
| Loudwater Court Company Limited | Households | 1979 |
| Lowtide Cromer Limited | Hospitality | 2023 |
| LSH Properties Ltd | Financial services | 2021 |
| Lyrical Coffee Co Ltd | Manufacturing | 2019 |
| M & P Bumphrey (Builders) Ltd. | Extraterritorial | 1997 |
| M&E Commercials Ltd | Construction | 2022 |
| MACK1 Limited | Other services | 2015 |
| Mackenzie Charters Limited | Administrative & support | 2019 |
| Mackenzie Hotels Group Limited | Professional & scientific | 2019 |
| Mackenzie Hotels Limited | Hospitality | 2010 |
| Mackinnon Construction Holdings Limited | Financial services | 2023 |
| Macrobins Ltd | Financial services | 2006 |
| Magdalen Road Property Management Company Limited | Households | 2018 |
| Marine View Cromer Freehold Limited | Households | 2022 |
| Marshwell Limited | Households | 1987 |
| Matt Eadie Therapy & Coaching Ltd | Other services | 2024 |
| MAXIMUS2017 Limited | Hospitality | 2025 |
| MB Homes (Anglia) Ltd | Construction | 2021 |
| MB Lettings Ltd | Real estate | 2022 |
| Mcinally Construction Ltd | Construction | 2021 |
| ME & Jordan Ltd | Professional & scientific | 2022 |
| Medianess Ltd | Education | 2021 |
| Merchants Court Limited | Real estate | 1999 |
| Merchants' Place Ltd | Information & communication | 2004 |
| Metamalic Limited | Wholesale & retail | 2024 |
| Metamols Ltd | Professional & scientific | 2013 |
| Metis Education Partnerships Limited | Extraterritorial | 2012 |
| Migrants at Work Ltd | Other services | 2018 |
| Mimis Cromer Ltd | Hospitality | 2025 |
| Mini Monkey Gym (Franchising) Limited | Education | 2012 |
| Miramar Asset Management Ltd | Real estate | 2012 |
| MJB Homes Limited | Construction | 2016 |
| MJL Electrical Norfolk Ltd | Construction | 2022 |
| MK PUB Group Ltd | Hospitality | 2023 |
| Mondocare Limited | Health & social care | 2019 |
| Moovy Removals Limited | Transport & logistics | 2023 |
| Mrblippy Prints Limited | Manufacturing | 2005 |
| MS Enterprises (Anglia) Limited | Real estate | 2013 |
| Mulberry Holdings Limited | Construction | 2016 |
| Multeversity Ltd | Education | 2014 |
| Muspole Street Management Company (Norwich) Limited | Households | 2006 |
| N Simmons Limited | Arts & recreation | 2012 |
| Natural by Design Limited | Professional & scientific | 1997 |
| Newbridge Acquisitions Limited | Other services | 2015 |
| Newhaven Court (Cromer) Limited | Real estate | 2020 |
| Nixon (Norfolk) Ltd | Construction | 2025 |
| Nordcom Limited | Construction | 2015 |
| Norfolk Carpets Limited | Wholesale & retail | 2003 |
| Norfolk Cleaners Ltd | Administrative & support | 2023 |
| Norfolk Connected Ltd | Construction | 2017 |
| Norfolk Cottages Ltd | Real estate | 2023 |
| Norfolk Fire PIT Hire Ltd | Administrative & support | 2021 |
| Norfolk IT Solutions Ltd | Information & communication | 2024 |
| Norfolk Prints Ltd | Wholesale & retail | 2018 |
| Norfolk Property Restoration Limited | Construction | 2018 |