| Kynnexton Limited | Financial services | 2020 |
| KZ Engineering Ltd | Construction | 2022 |
| L & L Services Ltd | Mining & quarrying | 2016 |
| L a Griffen Ltd | Professional & scientific | 2016 |
| L B Construction (Norfolk) Limited | Construction | 2021 |
| L Brooks Electrical Ltd | Construction | 2011 |
| L C Installations Ltd | Construction | 2023 |
| L D Healy Services Limited | Real estate | 2021 |
| L G Perfect Engineering Ltd | Extraterritorial | 2013 |
| L T Roofing & Construction Ltd | Construction | 2022 |
| L T Services (UK) Limited | Administrative & support | 2010 |
| L.H.D. Marine Supplies Limited | Other services | 1969 |
| L.H.D.Limited | Other services | 1943 |
| L.Knell Estates Ltd | Real estate | 2024 |
| L.W Building Renovations Limited | Construction | 2026 |
| LA Bobita Convenience Store Ltd | Information & communication | 2022 |
| La-Plage Properties Limited | Real estate | 2002 |
| LAB Great Yarmouth Limited | Wholesale & retail | 2021 |
| LAG Mechanical Ltd | Professional & scientific | 2025 |
| Lake View Properties (Essex) Limited | Real estate | 2013 |
| Lamarti Properties Limited | Real estate | 2024 |
| Lamont Wealth Management Limited | Financial services | 2023 |
| Lance Johnson Ltd | Mining & quarrying | 2012 |
| Land & Marine Piling and Consultancy Services Ltd. | Mining & quarrying | 2017 |
| Landmark Renovations (East) Limited | Extraterritorial | 2008 |
| Landmark Renovations Limited | Professional & scientific | 2006 |
| Lane Smith the Grange Ormesby Ltd | Hospitality | 2018 |
| Larissa Cleaning Limited | Administrative & support | 2023 |
| LAS Palmas Cafe Limited | Hospitality | 2024 |
| Launica Limited | Health & social care | 2018 |
| Lauren's Cocktail Company Ltd | Other services | 2025 |
| Lavina Mode Ltd | Wholesale & retail | 2026 |
| Lawbell Holdings Ltd | Real estate | 2016 |
| LB Ropes & Mechanical Services Limited | Manufacturing | 2026 |
| LBH Norfolk Limited | Real estate | 2019 |
| LBP Consultants Limited | Education | 2026 |
| LC Car Body Shop Ltd | Wholesale & retail | 2022 |
| LCB Investments Limited | Real estate | 2020 |
| LCF Food Ltd | Hospitality | 2023 |
| LCM Cleaning Services Limited | Manufacturing | 2018 |
| LD Inspection Ltd | Professional & scientific | 2019 |
| LDE Property Limited | Real estate | 2020 |
| Ldsc Holdings Ltd | Financial services | 2024 |
| LE Cafe Crepe Limited | Hospitality | 2007 |
| Lead Diagnostics Solutions Limited | Manufacturing | 2023 |
| Leadspurt Ltd | Professional & scientific | 2022 |
| Leander Property Investments Limited | Real estate | 2021 |
| Leap Escapes Ltd | Real estate | 2025 |
| Leechy's Garage Limited | Wholesale & retail | 2018 |
| Leechys Lettings Limited | Extraterritorial | 2015 |
| Leisure Climbing Ltd | Arts & recreation | 2004 |
| LEK Thai Ltd | Hospitality | 2025 |
| Lelean Project Services Ltd | Construction | 2013 |
| LEN Bullimore & Sons Ltd | Hospitality | 2002 |
| Lenway Limited | Real estate | 2003 |
| Leroy Clearance Deals Ltd | Administrative & support | 2018 |
| Levendes Limited | Real estate | 2021 |
| Levene Dental Care Limited | Health & social care | 2009 |
| Levvel Limited | Professional & scientific | 2025 |
| Lewis Enterprise Investments 2 Limited | Financial services | 2021 |
| Lewis Enterprise Investments 3 Limited | Financial services | 2023 |
| Lewis Enterprise Investments Limited | Financial services | 2017 |
| Lewis Nicholls Associates Limited | Construction | 2017 |
| Lewis Properties (Harleston) Limited | Real estate | 2015 |
| Lewis Repair & Service Ltd | Manufacturing | 2020 |
| Lewis Taylor Carpentry Limited | Construction | 2018 |
| Lewislocums Limited | Health & social care | 2025 |
| Leys Cleaners Limited | Administrative & support | 2025 |
| Leys Cleaning Services Limited | Administrative & support | 2018 |
| LFS Vehicle Recycling Limited | Wholesale & retail | 2026 |
| LH Renewables Ltd | Professional & scientific | 2025 |
| Licensed Trade Special Operations Ltd | Professional & scientific | 2020 |
| Lichfield Community Association Limited | Arts & recreation | 2001 |
| Lichfield Foods Limited | Hospitality | 2021 |
| Lichfield Property Investment Limited | Real estate | 2022 |
| Lichfield Retail Limited | Wholesale & retail | 2022 |
| Light Bites Catering Limited | Hospitality | 2013 |
| Light Electrical Services Limited | Construction | 2024 |
| Lightscape (Norwich) Limited | Arts & recreation | 2019 |
| Lilian Close Management Company Limited | Real estate | 2003 |
| Lillypops Holdings Limited | Financial services | 2024 |
| Lime Kiln Properties Limited | Real estate | 1992 |
| Limekiln Developments Limited | Construction | 2016 |
| Liminal Education East Anglia Ltd | Education | 2024 |
| Limpus Holdings Ltd | Financial services | 2021 |
| Lindchem Limited | Extraterritorial | 2009 |
| Lines & Lines Limited | Hospitality | 2025 |
| Link Developments (EA) Limited | Households | 2012 |
| Lintott Telecommunications Limited | Information & communication | 2025 |
| Lion & Herring Limited | Hospitality | 2019 |
| Lion Engineering Services Limited | Manufacturing | 1993 |
| Lion Public House (GY) Limited | Hospitality | 2009 |
| Lionheart Neurocare Limited | Health & social care | 2025 |
| Litchport Limited | Households | 1983 |
| Little Birdie Limited | Administrative & support | 2015 |
| Little L'S Coffee Limited | Hospitality | 2026 |
| Little Ones Land Limited | Education | 2026 |
| Little Pigs Ltd | Hospitality | 2025 |
| Little Yarmouth Ltd | Manufacturing | 2026 |
| Littledevilsworkshop Ltd | Construction | 2026 |