| Lasoro Consulting Limited | Information & communication | 2004 |
| Lasoro Ltd | Arts & recreation | 2013 |
| Latchingdon Lion Ltd | Hospitality | 2019 |
| Late Space Ltd | Professional & scientific | 2021 |
| Latentsun Ltd | Information & communication | 2016 |
| Later Life Guidance Service Ltd | Administrative & support | 2018 |
| Lateral Money Limited | Extraterritorial | 2004 |
| Latham (2015) Limited | Health & social care | 2015 |
| Latham Lodge Limited | Health & social care | 1999 |
| Latimer Consultancy Limited | Construction | 2017 |
| Laughter Specialists Training Ltd | Education | 2022 |
| Laughton Property Limited | Real estate | 2025 |
| Launchequal Limited | Real estate | 1991 |
| Laura Richards Boutique Limited | Wholesale & retail | 2022 |
| Laura Stevenson Ltd | Professional & scientific | 2024 |
| Lauren Clark Childcare Ltd | Health & social care | 2026 |
| Lauren Taylor Ltd | Other services | 2021 |
| Laurie Praise Concepts Limited | Other services | 2017 |
| Laurisha Limited | Administrative & support | 2016 |
| Lavender Hall Limited | Extraterritorial | 2006 |
| Lavyuk Consultancy Services Ltd | Information & communication | 2020 |
| Law's Property Investment Ltd | Real estate | 2024 |
| Law's Property Management Limited | Real estate | 2026 |
| Lawes Consultants Limited | Professional & scientific | 2018 |
| Lawes Garage Limited | Wholesale & retail | 2010 |
| Lawford Finance Ltd | Professional & scientific | 2014 |
| Lawford Place Freehold Company Limited | Households | 2012 |
| Lawford Place Management Company Ltd. | Households | 2006 |
| Lawgra (NO.1465) Limited | Other services | 2008 |
| Lawn Brothers Ltd | Administrative & support | 2013 |
| Lawrence Music Ltd | Arts & recreation | 2010 |
| Laybank (Harlow) Management Company Limited | Households | 1985 |
| Layer Brook Consultancy Limited | Information & communication | 2017 |
| Layer Marney Properties Limited | Real estate | 1996 |
| Layer Marney PUB One Limited | Hospitality | 2015 |
| Layer Marney PUB Three Limited | Hospitality | 2015 |
| Layer Marney PUB Two Limited | Hospitality | 2015 |
| Layer Marney Pubs Limited | Financial services | 2015 |
| Layer Mills Limited | Agriculture & fishing | 1949 |
| Layer Park Management Company Limited | Real estate | 2022 |
| Layer Road Car Wash Ltd | Administrative & support | 2026 |
| Layla Properties Ltd | Real estate | 2015 |
| Laysar Ltd | Real estate | 2021 |
| Layton Family Investments Ltd | Real estate | 2026 |
| Lazy Studio Games Ltd | Information & communication | 2025 |
| La’Blinks Luxury London Limited | Other services | 2024 |
| LB & Mstg Property Ltd | Real estate | 2025 |
| LB 2 Limited | Real estate | 2014 |
| LB Medical Group Ltd | Health & social care | 2018 |
| LB Universal Ltd | Construction | 2025 |
| LB Wealth Partners Limited | Other services | 2022 |
| LBB Ltd | Professional & scientific | 2004 |
| LBC Drylining Ltd | Construction | 2022 |
| Lbee Arts Ltd | Construction | 2026 |
| LBL Aesthetics and Laser Ltd | Other services | 2022 |
| LBL Aesthetics Training Ltd | Other services | 2026 |
| LBL P&L Services Limited | Real estate | 2025 |
| Lbmf Ltd | Information & communication | 2024 |
| LBS Wellbeing Ltd | Health & social care | 2024 |
| LC Project Management Ltd | Professional & scientific | 2011 |
| LC Residential Limited | Real estate | 2019 |
| LC Support Solutions Ltd | Administrative & support | 2024 |
| Lcat Trading Ltd | Arts & recreation | 2012 |
| LCH Heating & Plumbing Ltd | Construction | 2024 |
| LCL Lettings Ltd | Real estate | 2018 |
| LCP Property (Essex) Limited | Real estate | 2024 |
| LD Coaching Consultancy Limited | Arts & recreation | 2025 |
| Ldaco Ltd | Transport & logistics | 2021 |
| Lday Limited | Professional & scientific | 2022 |
| LDM Automotive Ltd | Wholesale & retail | 2024 |
| LDP Catering Ltd | Hospitality | 2023 |
| LDS Homes Limited | Real estate | 2021 |
| LDS Management Ltd | Administrative & support | 2019 |
| Lduk Bookkeeping & Payroll Limited | Professional & scientific | 2020 |
| LE Cateau Management Limited | Households | 2007 |
| LE Cheval Noir Ltd | Hospitality | 2012 |
| LE Clean Atelier Ltd | Administrative & support | 2024 |
| LE River Lyrá Ltd | Wholesale & retail | 2024 |
| LE Talbooth Dedham Limited | Hospitality | 1972 |
| Leabrook Imports Ltd | Wholesale & retail | 2023 |
| Lead Flow Marketing Ltd | Professional & scientific | 2026 |
| Leadfinance Ltd | Financial services | 2022 |
| Leading Motion Ltd | Professional & scientific | 2014 |
| Leadingtwodigital Ltd | Professional & scientific | 2021 |
| Leaeff Ltd | Health & social care | 2019 |
| Leaf and Grain Penge Limited | Hospitality | 2024 |
| Leam Ltd | Arts & recreation | 2012 |
| Lean Business Improvement Ltd | Professional & scientific | 2016 |
| Leapfrog Management & Property Consultants Ltd. | Professional & scientific | 2020 |
| Leapgear Ltd | Manufacturing | 2002 |
| Learn for Happy Living Ltd | Information & communication | 2024 |
| Learning & Skills Solutions Limited | Education | 2006 |
| Learning Academies Ltd | Education | 2007 |
| Leavenheath Events CIC | Administrative & support | 2026 |
| Leavenheath Joinery Limited | Manufacturing | 2002 |
| Lecsps Ltd | Health & social care | 2022 |
| LED Electrical Group Limited | Construction | 2012 |
| LEE Houghton's Embalming & Bearing Services Ltd | Other services | 2014 |
| LEE Smith Trading Limited | Wholesale & retail | 2018 |
| LEE Steel Ltd | Construction | 2015 |