| LEE Stiles Roofing Limited | Construction | 2014 |
| Leelee PUB Co Limited | Hospitality | 2022 |
| Leem Global Limited | Wholesale & retail | 2022 |
| Lees Guttering and Property Maintenance Services Limited | Administrative & support | 2010 |
| Lees Learning Services Ltd | Education | 2013 |
| Leevoke Ltd. | Professional & scientific | 2022 |
| Leeward Court Management Company Limited | Households | 1988 |
| Lee’S Double Glazing Ltd | Construction | 2023 |
| Legacies East Ltd | Real estate | 2020 |
| Legacies West Ltd | Real estate | 2020 |
| Legacy Beauty & Skin Clinic Ltd | Other services | 2025 |
| Legacy Holdings (Essex) Limited | Financial services | 2026 |
| Legacy Living Property Ltd | Households | 2025 |
| Legacy Wealth Planning Ltd | Financial services | 2025 |
| Legal Comfort Associates Limited | Professional & scientific | 2011 |
| Legal Consult Limited | Administrative & support | 2000 |
| Legaleze Limited | Information & communication | 2010 |
| Legalup Consulting Ltd | Professional & scientific | 2018 |
| Legalup Corporate Limited | Professional & scientific | 2025 |
| Legendary Hooves Equestrian Limited | Wholesale & retail | 2025 |
| Legga Ltd | Health & social care | 2025 |
| Legionella Control Association Limited | Other services | 2013 |
| Legisia Limited | Professional & scientific | 2015 |
| Legra Investments Limited | Real estate | 2014 |
| Legro Cycling Limited | Education | 2014 |
| Leho and Son's Haulage Ltd | Transport & logistics | 2025 |
| Leisure Hire Marquees Limited | Other services | 2008 |
| LEISURE43 Ltd | Arts & recreation | 2013 |
| Leitmotif Learning Ltd | Education | 2011 |
| LEJ Hair Clinic Ltd | Other services | 2008 |
| LEM Health Care Ltd | Health & social care | 2018 |
| Lemon ARC Solutions Ltd | Information & communication | 2016 |
| Lennie & Stan Ltd | Information & communication | 2019 |
| Lenoxal Limited | Administrative & support | 2023 |
| Lenshal Ltd | Transport & logistics | 2023 |
| Lenz Security Limited | Administrative & support | 2017 |
| LEO Jones Ltd | Administrative & support | 2021 |
| LEO Projects Management Ltd | Construction | 2012 |
| Leodal Ltd | Transport & logistics | 2022 |
| Leon Doga Bistro Limited | Hospitality | 2026 |
| Leonard K SOT Limited | Wholesale & retail | 2010 |
| Leonardo Monzon Limited | Health & social care | 2021 |
| Leonie Foods Ltd | Hospitality | 2026 |
| Leonie Tucker Designs Ltd | Information & communication | 2016 |
| Leonora Borg Ltd | Public administration | 2017 |
| Leopold House (Felixstowe) Management Company Limited | Households | 2025 |
| Leport Design and Build Limited | Construction | 2026 |
| Leppard & Martin Ltd | Construction | 2014 |
| Leren Limited | Education | 2014 |
| LES Powell Consulting Ltd | Extraterritorial | 2023 |
| Lesley Joy Curtains and Soft Furnishings Ltd | Wholesale & retail | 2026 |
| Lesley Mcgrath Ltd | Other services | 2020 |
| Leston Stationery Limited | Wholesale & retail | 1981 |
| LET Your Hair Down Project CIC | Education | 2023 |
| Let's Go Care Ltd | Health & social care | 2018 |
| Let's Go Make Ltd | Wholesale & retail | 2025 |
| Let's Go Market Limited | Wholesale & retail | 2014 |
| Letangco Ltd | Real estate | 2026 |
| Letem Ltd | Other services | 2018 |
| Lethe Grove Residents' Association Limited | Households | 1983 |
| Letisya Treasures Limited | Wholesale & retail | 2025 |
| Leto Electrical Ltd | Professional & scientific | 2014 |
| Let’S Go Enterprises Limited | Arts & recreation | 2025 |
| Leumas Property Ltd | Real estate | 2025 |
| Levam Consultancy Ltd | Professional & scientific | 2014 |
| Levare Consulting Ltd | Professional & scientific | 2025 |
| Level PAR Investment Services Ltd | Financial services | 2012 |
| Level UP Competitions Limited | Arts & recreation | 2025 |
| Levels Creative Media Limited | Information & communication | 2021 |
| Leven Security Limited | Administrative & support | 2025 |
| Levison Alexander Automotive Ltd | Wholesale & retail | 2019 |
| Levscol Limited | Manufacturing | 2005 |
| Lewin Traffic Ltd | Construction | 2022 |
| Lewis Allen Musical Director Services Ltd | Arts & recreation | 2015 |
| Lewis Effects Limited | Professional & scientific | 2018 |
| Lewis Engineering Enterprises Ltd | Professional & scientific | 2022 |
| Lewis LEE Ice Cream Limited | Wholesale & retail | 2003 |
| Lewis Murphy Limited | Construction | 2016 |
| Lewis's Fish & Grill Ltd | Hospitality | 2018 |
| LEX Building Services Ltd | Construction | 2023 |
| Lexden Barbers Limited | Other services | 2019 |
| Lexden Building Services Limited | Construction | 2017 |
| Lexden Consultancy Ltd | Information & communication | 2017 |
| Lexden Contracts Limited | Construction | 2013 |
| Lexden Convenience Stores Ltd | Wholesale & retail | 2026 |
| Lexden Enterprises Limited | Construction | 2018 |
| Lexden Garden of Rest Limited | Other services | 1950 |
| Lexden Gardens (Colchester) Management Company Limited | Households | 2021 |
| Lexden Grange Management Company Limited | Households | 2006 |
| Lexden Holdings Ltd | Real estate | 2017 |
| Lexden Homes (Colchester) Limited | Construction | 2018 |
| Lexden Lodge (West) Limited | Households | 1995 |
| Lexden Park Management Limited | Households | 1994 |
| Lexden Projects Ltd | Real estate | 2023 |
| Lexden Rackets and Fitness Club Limited | Other services | 1997 |
| Lexden Restorations Limited | Construction | 1991 |
| Lexden Retreat (2021) Ltd | Other services | 2020 |
| Lexden Rise Limited | Other services | 2017 |
| Lexden Sanctuary | Other services | 2017 |
| Lexden Vehicle Services Ltd | Wholesale & retail | 2020 |