| Lexden Wealth Management Limited | Financial services | 2020 |
| Lexden Wood Limited | Arts & recreation | 2024 |
| Lextone Properties and Lettings Ltd | Real estate | 2025 |
| Leymar Group Ltd | Transport & logistics | 2023 |
| LFI (Bespoke) Ltd | Wholesale & retail | 2011 |
| LG Glazing Systems Limited | Construction | 2025 |
| LG Rail Ltd | Professional & scientific | 2018 |
| Lgcomms (2018) Ltd | Other services | 2018 |
| LGS Construction Essex Limited | Construction | 2017 |
| LGS Scaffolding Ltd | Construction | 2023 |
| Lgsm Ltd | Education | 2024 |
| LH Dynamics Ltd | Arts & recreation | 2026 |
| LH Epicurean Ltd | Hospitality | 2026 |
| LH Operations Ltd | Health & social care | 2025 |
| LH Property Services Ltd | Real estate | 2018 |
| Lh&Sl Properties Ltd | Real estate | 2026 |
| LHA Architecture and Design Ltd | Professional & scientific | 2021 |
| LHE Special Projects Limited | Extraterritorial | 2022 |
| LHG Limited | Professional & scientific | 2005 |
| LHI Brickwork Limited | Construction | 2022 |
| LHS Media Management Ltd | Professional & scientific | 2025 |
| LHS Trades Ltd | Wholesale & retail | 2025 |
| Lianah Property Rental Ltd | Real estate | 2023 |
| Liberty Comfort Ltd | Wholesale & retail | 2026 |
| Libra Financial Limited | Financial services | 2024 |
| Library Mews (Rendlesham) Management Company Limited | Real estate | 2008 |
| Libre Construction Limited | Construction | 2026 |
| Libre Planning Limited | Professional & scientific | 2026 |
| Libre Solutions Limited | Professional & scientific | 2023 |
| Lica Advisory Ltd | Information & communication | 2025 |
| Lichun Dent. Limited | Health & social care | 2026 |
| Lidbury Tech Ltd | Information & communication | 2024 |
| Lien's Collections Ltd | Wholesale & retail | 2012 |
| Lierre Property Management Limited | Real estate | 2003 |
| Liew Contracts Ltd | Construction | 2014 |
| Life and Provide UK Limited | Financial services | 2026 |
| Life and Success Global Ltd | Information & communication | 2024 |
| Life and Success Media Ltd | Information & communication | 2013 |
| Life and Success Publishing Ltd | Information & communication | 2024 |
| Life Assess Limited | Information & communication | 2025 |
| Life Directions Limited | Professional & scientific | 2007 |
| Life IS Good Baby Ltd | Hospitality | 2022 |
| Life Minder UK Limited | Other services | 2019 |
| Life Navigation Ltd | Health & social care | 2013 |
| Lifeboat 5202 Limited | Arts & recreation | 2021 |
| Lifecare Mobility Ltd | Administrative & support | 2011 |
| Lifeform Limited | Professional & scientific | 2003 |
| Lifehouse Ministries | Other services | 2009 |
| Liferaft Films Limited | Information & communication | 2024 |
| Lifestyle Developments Limited | | 1987 |
| Lifestyle Interiors Ltd | Wholesale & retail | 2017 |
| Lifestyle Kitchens and Bedrooms Ltd | Professional & scientific | 2024 |
| Lifetropics Limited | Wholesale & retail | 2018 |
| Lift Management (Servicing) Ltd | Professional & scientific | 2024 |
| Lift Management Limited | Professional & scientific | 2019 |
| Lift Official Ltd | Wholesale & retail | 2024 |
| Light Entertainment Limited | Arts & recreation | 1996 |
| Light Events Weddings Ltd | Hospitality | 2024 |
| Light House Abodes Ltd | Real estate | 2020 |
| Light UP Africa Ltd | Mining & quarrying | 2025 |
| Lightcraft UAS Ltd | Information & communication | 2026 |
| Lightgate International Ltd | Education | 2016 |
| Lighthouse Holidays Ltd | Hospitality | 2022 |
| Lighthouse Medical Services Ltd | Health & social care | 2026 |
| Lighthouse Personnel Ltd | Administrative & support | 2017 |
| Lighting Electrical Experts Ltd | Construction | 2025 |
| Lights Camera Reaction Ltd | Professional & scientific | 2024 |
| Lignum Vitae Antique Ltd | Extraterritorial | 2024 |
| Lili Tots Ltd | Education | 2016 |
| Lillywhite International Limited | Administrative & support | 2023 |
| Lily & Fern Limited | Wholesale & retail | 2023 |
| Lily Aqua Essex Limited | Water & waste | 2025 |
| Lilystone Hall Management Limited | Households | 1981 |
| Lima Traffic Ltd | Construction | 2020 |
| Limbotech Ltd | Education | 2020 |
| Limbu Kebab Limited | Hospitality | 2019 |
| Limbu PVT Ltd | Real estate | 2025 |
| Lime Tree Assets Ltd. | Financial services | 2016 |
| Lime Tree Housing Limited | Health & social care | 2009 |
| Lime Tree Modbury Limited | Construction | 2023 |
| Lime Tree Projects Limited | Construction | 2008 |
| Limit State Technologies Ltd | Information & communication | 2011 |
| Limitless Mind Ltd | Education | 2023 |
| Limone Ventures Limited | Real estate | 2014 |
| LIN Brothers Consulting Ltd | Health & social care | 2022 |
| LIN Kitchen 80 Ltd | Hospitality | 2023 |
| Linc Logistics Limited | Transport & logistics | 1999 |
| Lincoln Pixels Ltd | Professional & scientific | 2025 |
| Linda Oliver Limited | Wholesale & retail | 2018 |
| Linden Alliance Limited | Information & communication | 2004 |
| Linden Lady Chocolates Limited | Manufacturing | 1994 |
| Linden Residential Limited | Real estate | 2016 |
| Lindof Consultancy Ltd | Professional & scientific | 2018 |
| Lindsey Heating (Chelmsford) Limited | Construction | 1962 |
| Lindsey Heating Co.Limited(The) | Construction | 1951 |
| Lindsey Maintenance Services Limited | Construction | 2018 |
| Lineside Signalling Ltd | Professional & scientific | 2014 |
| Lingwood Clinic Limited | Real estate | 2007 |
| Lining Systems GRP Limited | Construction | 2015 |
| Link Eleven Ltd | Wholesale & retail | 2013 |