| KVD Plans Ltd | Professional & scientific | 2020 |
| KW Consultancy Services Ltd | Administrative & support | 2023 |
| Kwik Pick Ltd | Transport & logistics | 2016 |
| L & D Hair Limited | Other services | 2020 |
| L & J Contracts & Interiors Limited | Construction | 2015 |
| L & J Contracts Limited | Construction | 2006 |
| L & R Solutions Limited | Manufacturing | 2026 |
| L D Procurement Limited | Professional & scientific | 2026 |
| L J Mansell Recruitment Limited | Administrative & support | 2024 |
| L P Decorations Ltd | Construction | 2022 |
| L&A Facades Limited | Construction | 2012 |
| LA Cambicha Studio Ltd | Administrative & support | 2025 |
| LAB Donkey Ltd | Information & communication | 2025 |
| Lake Meadows Management Company Limited | Real estate | 1990 |
| Lakeview Automotive Limited | Manufacturing | 2013 |
| Lakila Recruitment Ltd | Administrative & support | 2020 |
| Lambro Interiors Limited | Construction | 2012 |
| Lancaster Private Equity Ltd | Real estate | 2012 |
| Landmark Fire Safety Ltd | Professional & scientific | 2026 |
| Lando Future Ltd | Professional & scientific | 2017 |
| Landworthy Limited | Construction | 1990 |
| Langham EPI Consulting Ltd | Professional & scientific | 2015 |
| Langhams Risk Management Ltd | Professional & scientific | 2022 |
| Langthorne Management Co Ltd. | Extraterritorial | 2008 |
| Langthornes Residents Limited | Households | 2020 |
| Languagemate Ltd | Information & communication | 2018 |
| Lansdowne Accountancy Ltd | Professional & scientific | 2021 |
| Larking MAD Ltd | Wholesale & retail | 2016 |
| Larocca Estates Limited | Households | 2019 |
| Larree Ltd | Wholesale & retail | 2019 |
| Laser Technology Services Limited | Professional & scientific | 2014 |
| Laserite Limited | Manufacturing | 1995 |
| Laura Landers Mortgages Ltd | Financial services | 2025 |
| Lauren ZOE Carter Ltd | Arts & recreation | 2025 |
| Laurens D'Auray Hair & Beauty Limited | Other services | 2005 |
| Lawrence & Co Homes Limited | Other services | 2019 |
| Lawrence Mannering Limited | Real estate | 2020 |
| Lawrence Saxony Ltd | Real estate | 2024 |
| Lawsons Group Limited | Construction | 2015 |
| Lazer Road Marking Ltd | Administrative & support | 2025 |
| LBS Assets and Holdings Ltd | Real estate | 2020 |
| LC Reyes Ltd | Health & social care | 2021 |
| Lc-Av Productions Ltd | Administrative & support | 2012 |
| LCP Financial Limited | Financial services | 2017 |
| LCS Property Holdings Limited | Real estate | 2026 |
| Le'Bert Rigging Limited | Information & communication | 2020 |
| LEA Court Management (Great Baddow) Limited | Households | 2000 |
| Lead and Learn Dog Walking & Training Ltd | Other services | 2025 |
| Leadbeatter's Labour Limited | Construction | 2018 |
| Leadership Launchpad Ltd | Professional & scientific | 2024 |
| Leaky Finders Essex Limited | Construction | 2025 |
| Leal Homes Limited | Real estate | 2023 |
| Learnofai Limited | Information & communication | 2026 |
| Lebe Construction Limited | Construction | 2017 |
| LEE and SON Plastering Ltd | Construction | 2014 |
| LEE Stock Limited | Other services | 2006 |
| Legitimate Transport Limited | Transport & logistics | 2008 |
| Legra Capital Limited | Other services | 2025 |
| Leguan Limited | Real estate | 2024 |
| Leigh Properties Limited | Construction | 1980 |
| Leigh Restaurants Limited | Wholesale & retail | 2007 |
| Leigh Swim School LLP | | 2022 |
| Leisure Turf Limited | Administrative & support | 2009 |
| Leitrim Investments Limited | Construction | 2025 |
| Lemongrass Holdings Limited | Financial services | 2024 |
| Lepine Limited | Wholesale & retail | 2021 |
| LES Engineering Services Ltd | Construction | 2026 |
| LES Group Services Ltd | Other services | 2025 |
| Let's Launch Ltd | Professional & scientific | 2026 |
| Let's Talk Insurance Services Ltd | Financial services | 2024 |
| Leuco Contracts Ltd | Construction | 2024 |
| Lewis Adams Productions Ltd | Information & communication | 2020 |
| Lexan Painters Ltd | Construction | 2024 |
| Lexan Refurbishment Limited | Construction | 2013 |
| LF Financial Consulting Limited | Financial services | 2011 |
| LFW Media Limited | Information & communication | 2016 |
| LGC Services (UK) Limited | Administrative & support | 2011 |
| Lhcm Services Ltd | Administrative & support | 2024 |
| LHL Installations Ltd | Construction | 2015 |
| Libra Properties London Ltd | Real estate | 2021 |
| Lidstone-Scott Consultancy Ltd | Professional & scientific | 2023 |
| Lifelens AI Ltd | Information & communication | 2026 |
| Lifesurprise Ltd | Manufacturing | 2021 |
| Lift Renovations Limited | Construction | 2019 |
| LIG Services Ltd | Information & communication | 2018 |
| Light Projects Group Limited | Manufacturing | 2002 |
| Light Projects Limited | Manufacturing | 1985 |
| Light the Sky Fireworks Limited | Arts & recreation | 2018 |
| Lightblue Online LLP | | 2010 |
| Lightblue UK Limited | Financial services | 2004 |
| Lighthouse Property Services East Anglia Ltd | Construction | 2024 |
| Lightscape Projects Limited | Professional & scientific | 1993 |
| Lilianas Properties Ltd | Real estate | 2025 |
| LILILO2125 Limited | Real estate | 2025 |
| Lily Rose Aesthetics Ltd | Wholesale & retail | 2019 |
| Limbless Association | Health & social care | 1990 |
| Limeberry Catering Events Holdings Limited | Financial services | 2026 |
| Limitlesscontracts Ltd | Manufacturing | 2025 |
| Linace Repossession Company Limited | Wholesale & retail | 2003 |
| Linda Elton Interiors Limited | Professional & scientific | 2019 |