| Lewis Huggins Consultancy Services Limited | Construction | 2019 |
| Lewis Properties (EA) Limited | Real estate | 2026 |
| LEY Plant Limited | Administrative & support | 2015 |
| LG Supplies Ltd | Wholesale & retail | 2025 |
| LHS Refko Fire Installations Limited | Other services | 1976 |
| Liam Lambert Aggregates Limited | Wholesale & retail | 2018 |
| Liam Lambert Construction Limited | Construction | 2015 |
| Libra 3 Ltd | Professional & scientific | 2025 |
| Life in Concert Ltd | Education | 2023 |
| Lift Truck Rentals (Northern) Limited | Wholesale & retail | 2015 |
| Lighthouse Diner Limited | Hospitality | 2002 |
| Lighthouse Learning Provision Ltd | Education | 2026 |
| Limburn Letting Ltd | Real estate | 2025 |
| Limburn Ltd | Manufacturing | 2025 |
| Limc UK Limited | Manufacturing | 2025 |
| LIMEHOUSE4 Ltd | Hospitality | 2023 |
| Limitless Film and Media Ltd | Information & communication | 2018 |
| Lion International Consulting Ltd | Financial services | 2018 |
| Liquid 11 Data Limited | Other services | 2014 |
| Liquid 11 Estates Limited | Real estate | 2014 |
| Liquid 11 Holdings Limited | Financial services | 2014 |
| Liquid 11 Limited | Other services | 2002 |
| Listers Guitars Ltd | Wholesale & retail | 2013 |
| Listmaker Project Solutions Ltd | Professional & scientific | 2014 |
| Little Black Dog Holdings Limited | Real estate | 2019 |
| Little Hill Property Services Limited | Real estate | 2020 |
| Little Jumpers Events Ltd | Administrative & support | 2026 |
| Little Lamb Cotton Ltd | Wholesale & retail | 2025 |
| Livbbarber Ltd | Other services | 2024 |
| Live Sound Network Ltd | Arts & recreation | 2022 |
| Lively Looks Ltd | Wholesale & retail | 2026 |
| Living With Mental Health CIC | Health & social care | 2025 |
| Livingstones Freehouse Limited | Hospitality | 2025 |
| LM Housing Limited | Real estate | 2021 |
| LM Worldwide Travel Ltd | Administrative & support | 2024 |
| Lm&Ad Limited | Wholesale & retail | 2024 |
| Lock Holdings Ltd | Real estate | 2017 |
| Lock Transport and Removals Ltd | Transport & logistics | 2020 |
| Lockeyandbeareantiques Limited | Wholesale & retail | 2026 |
| Lofish Limited | Agriculture & fishing | 2016 |
| London Road 1956 Limited | Extraterritorial | 2014 |
| Long Road Management Company (Lowestoft) Limited | Households | 2019 |
| Longbeach Lettings Limited | Real estate | 2021 |
| Longbridge 247 Ltd | Arts & recreation | 2024 |
| Longshore Herring Company Limited | Financial services | 2023 |
| Looses Emporium Limited | Wholesale & retail | 2026 |
| LOS Mendozas Ltd | Hospitality | 2024 |
| LOT4YOU Ltd | Wholesale & retail | 2017 |
| Lounge Nine Limited | Other services | 2016 |
| Love Innovations Limited | Wholesale & retail | 2017 |
| Loveness Limited | Real estate | 2022 |
| Lovey Dovey Ltd | Wholesale & retail | 2024 |
| LOWEST23 Ltd | Wholesale & retail | 2023 |
| Lowestoft and Oulton Broad Motor Boat Club Limited | Arts & recreation | 1978 |
| Lowestoft Autos & Removals Ltd | Wholesale & retail | 2025 |
| Lowestoft Builders Ltd | Construction | 2010 |
| Lowestoft Car and Commercial Ltd | Wholesale & retail | 2026 |
| Lowestoft Car Repairs Ltd | Wholesale & retail | 2024 |
| Lowestoft Cruising Club Limited | Arts & recreation | 2024 |
| Lowestoft Gymnastics Ltd | Education | 2020 |
| Lowestoft Handyman & Maintenance Ltd | Other services | 2015 |
| Lowestoft Home Store Limited | Wholesale & retail | 2025 |
| Lowestoft Hydraulics Limited | Administrative & support | 1993 |
| Lowestoft Live CIC | Arts & recreation | 2023 |
| Lowestoft Marina Limited | Arts & recreation | 2002 |
| Lowestoft Masonic Hall Company Limited | Hospitality | 1965 |
| Lowestoft Offshore Services Limited | Manufacturing | 1982 |
| Lowestoft Pizza Ltd | Hospitality | 2025 |
| Lowestoft Shellfish Company Limited | Wholesale & retail | 2012 |
| Lowestoft Storage Ltd | Transport & logistics | 2025 |
| Lowestoft Studio Ceramics Ltd | Arts & recreation | 2025 |
| Lowestoft Tandoori Ltd | Hospitality | 2026 |
| Lowestoft Town Electrical Limited | Construction | 2018 |
| Lowestoft Town Football Club Limited | Arts & recreation | 2014 |
| Lowestoft Town Scaffolding Ltd | Construction | 2015 |
| Lowestoft Van & Car Sales Limited | Wholesale & retail | 2020 |
| Lowestoft Wedding Hire Ltd | Other services | 2015 |
| Lowestoft Yacht Haven Limited | Real estate | 1997 |
| Loyal Friend Projects CIC | Education | 2024 |
| LRB Property East Ltd | Real estate | 2026 |
| LT Coastal Properties Limited | Real estate | 2026 |
| Lubbock Property Ltd | Real estate | 2022 |
| Lucky Lass Competitions Ltd | Administrative & support | 2026 |
| Lucy Angel Ltd | Health & social care | 2025 |
| Lumos Talent Ltd | Administrative & support | 2025 |
| Luna Electrical Limited | Construction | 2025 |
| Luno Property Lettings Limited | Real estate | 2026 |
| Luther S Zimani Ltd | Education | 2025 |
| LV Holdings Ltd | Real estate | 2024 |
| Lxiv Skincare Ltd | Wholesale & retail | 2026 |
| Lynn Willert Hypnotherapy Limited | Health & social care | 2003 |
| Lyon Refrigeration and Air Conditioning Ltd | Construction | 2018 |
| M & M Patel Ltd | Information & communication | 2025 |
| M & R Car Sales Lowestoft Ltd | Wholesale & retail | 2026 |
| M & R Rentals Limited | Real estate | 2018 |
| M & T Installations Limited | Construction | 2017 |
| M and D Removal and Clearance Limited | Transport & logistics | 2025 |
| M and J Wade Ltd | Wholesale & retail | 2014 |
| M C Customs Limited | Other services | 2022 |
| M Lacon Limited | Extraterritorial | 2011 |