| Leigh Washrooms Ltd | Construction | 2024 |
| Leigh-On-Sea General Store Ltd | Wholesale & retail | 2018 |
| Leigh-On-Sea Laser Clinic Ltd | Other services | 2022 |
| Leigh-On-Sea Premier Supermarket Ltd | Real estate | 2014 |
| Leigh-On-Sea.Com Limited | Information & communication | 2012 |
| Leighton Leases Limited | Real estate | 2026 |
| Leighwood Court Management Company Limited | Hospitality | 1990 |
| Lele Homes Ltd | Wholesale & retail | 2024 |
| Lemomelo Ltd | Manufacturing | 2025 |
| Lemon & Lime Design Limited | Information & communication | 2012 |
| Lemondrop Design Limited | Professional & scientific | 2016 |
| Lendswift Holdings Ltd | Financial services | 2014 |
| Levi Capital Investments Limited | Financial services | 2017 |
| LFB Developers Limited | Construction | 2021 |
| LG Property Investments (Essex) Limited | Real estate | 2010 |
| LGW Projects Limited | Administrative & support | 2022 |
| LH Fundraising Limited | Other services | 2022 |
| Li&So Holding Limited | Financial services | 2019 |
| Liam's Detailing Ltd | Wholesale & retail | 2025 |
| Liber Abaci Consultancy Limited | Professional & scientific | 2020 |
| Libertas Services Ltd | Administrative & support | 2005 |
| Liberty Talking Therapy Limited | Health & social care | 2020 |
| Lici Group Limited | Other services | 2024 |
| Liebenco Consulting Ltd | Professional & scientific | 2023 |
| Liebenco Holdings Ltd | Financial services | 2024 |
| Liebenco Leigh Road Limited | Hospitality | 2023 |
| Liebenco Ltd | Hospitality | 2021 |
| Lifeline Coaching and Mentoring Ltd | Professional & scientific | 2023 |
| Lifeline Housing Solutions Ltd | Real estate | 2025 |
| Lifestyle & Mobility Basildon Limited | Wholesale & retail | 2025 |
| Lifestyle & Mobility Corporation Ltd | Financial services | 2024 |
| Lifestyle & Mobility Thanet Ltd | Wholesale & retail | 2025 |
| Liftlab Limited | Arts & recreation | 2025 |
| Lighthouse Cloud LLP | | 2020 |
| Lighthouse Interiors Limited | Construction | 2013 |
| Lighthouse IT Ltd | Information & communication | 2010 |
| Lighthouse IT Sales Limited | Wholesale & retail | 2021 |
| Lighthouse Medical Training Ltd | Health & social care | 2023 |
| Lighting and Electrics Limited | Information & communication | 2014 |
| Lightpoint Limited | Professional & scientific | 1998 |
| Lignum Core Ltd | Financial services | 2026 |
| LIKE2SHOP Limited | Wholesale & retail | 2023 |
| Likestone Limited | Construction | 2015 |
| Lillys Cleaning Ltd | Administrative & support | 2025 |
| Lily of the Valley Films Limited | Information & communication | 2024 |
| Lilymac Consulting Limited | Information & communication | 2016 |
| Lima Payroll Ltd | Professional & scientific | 2025 |
| Lima Surveys Ltd | Professional & scientific | 2021 |
| Limelease Limited | Real estate | 1992 |
| Limestone Landscapes Limited | Administrative & support | 2003 |
| Limitless Improvements Limited | Construction | 2013 |
| Lincoln Steel Ltd | Manufacturing | 2013 |
| Lindsay Owens Aesthetics Academy Ltd | Other services | 2020 |
| Lindsay Owens Aesthetics London Ltd | Other services | 2020 |
| Linear Digital Ltd | Professional & scientific | 2025 |
| Lined UP Events Limited | Professional & scientific | 2022 |
| Lineworks Architects Limited | Professional & scientific | 2016 |
| Linezone Limited | Professional & scientific | 1992 |
| Linfield Photography Ltd | Professional & scientific | 2024 |
| Linish London & Co Property Ltd | Real estate | 2023 |
| Linkaba Ltd | Education | 2023 |
| Links Consulting Ltd | Information & communication | 2020 |
| Links Education Ltd | Education | 2021 |
| Linn Consulting Limited | Administrative & support | 2008 |
| Lintott Building Solutions Ltd | Construction | 2013 |
| Lion Barbershop Ltd | Other services | 2022 |
| Lion Construction Build Ltd | Construction | 2016 |
| Lioness PAY Services Ltd | Administrative & support | 2022 |
| LIP Reading Dentist Limited | Health & social care | 2024 |
| LIP1 Ltd | Construction | 2025 |
| Liquidsonics Ltd | Administrative & support | 2014 |
| LIS Electrical Limited | Construction | 2021 |
| Lisa Inside Addiction Limited | Health & social care | 2021 |
| Lisa Wyss Associates Search & Selection Ltd | Other services | 2014 |
| Listers Media Limited | Arts & recreation | 2022 |
| Listons Limited | Wholesale & retail | 2010 |
| Lithium Pro Energy Ltd | Wholesale & retail | 2021 |
| Little Brown BEE Ltd | Agriculture & fishing | 2023 |
| Little Dog Investments Limited | Real estate | 2020 |
| Little Farmicist Ltd | Health & social care | 2024 |
| Little Light Publishing Ltd | Information & communication | 2022 |
| Little Love’S Pamper BUS Ltd | Other services | 2024 |
| Little Musketeers Limited | Arts & recreation | 2009 |
| Little Rose Farm Limited | Agriculture & fishing | 2022 |
| Little Sunshine Childminding Services Ltd | Health & social care | 2025 |
| Little Supernovas Ltd | Other services | 2010 |
| Little Swan Developments Ltd | Real estate | 2025 |
| Little Vape Co Leigh Limited | Wholesale & retail | 2024 |
| Little Wild Tribe | Education | 2017 |
| LIV Healthy Care Limited | Health & social care | 2022 |
| Lively Investments Ltd | Financial services | 2025 |
| Livelyhood Limited | Administrative & support | 2010 |
| Livelyhood Venues Limited | Hospitality | 2012 |
| Livemore Ltd | Professional & scientific | 2018 |
| Living in the Past Ltd | Extraterritorial | 2024 |
| Lj&O Hospitality Limited | Hospitality | 2014 |
| LJC Plastering Ltd | Construction | 2011 |
| LJD & SON Limited | Construction | 2024 |
| LJK Motors Limited | Professional & scientific | 2016 |
| Ljkemp & Co Ltd | Professional & scientific | 2018 |