| Laser Mechanical and Electrical London Limited | Construction | 2023 |
| Laser Renewable Energy Solutions Limited | Extraterritorial | 2023 |
| Lasting Education Limited | Education | 2014 |
| Lastleafcarpentry Ltd | Manufacturing | 2025 |
| LAT Medical Ltd | Health & social care | 2019 |
| Latham Investments Limited | Real estate | 2026 |
| Lathbury Consulting Ltd | Professional & scientific | 2020 |
| Lauderdale Mansions (West) Limited | Households | 1977 |
| Launch Grad Ltd | Information & communication | 2026 |
| Laupau Transport Ltd | Transport & logistics | 2024 |
| Laur Trans 2015 Limited | Transport & logistics | 2015 |
| Laura Jayne Design Ltd | Arts & recreation | 2018 |
| Laura's Transport Ltd | Transport & logistics | 2017 |
| Lauramy Shipping Limited | Transport & logistics | 2010 |
| Laurel Investment Properties LLP | | 2012 |
| Laurel Property Investments Limited | Real estate | 2005 |
| Laurence J Betts Limited | Agriculture & fishing | 1930 |
| Laureven Trans Ltd | Transport & logistics | 2025 |
| Laval Accountancy Ltd | Professional & scientific | 2024 |
| Lavender Bank Partners Ltd | Professional & scientific | 2016 |
| Lavender Blue Media Limited | Information & communication | 2002 |
| Law Construction Limited | Construction | 2020 |
| Law Roofing Limited | Construction | 2015 |
| Lawani Consulting Ltd | Information & communication | 2012 |
| Lawless-Relf Marketing Limited | Information & communication | 2012 |
| Lawson Freight Services Limited | Transport & logistics | 2003 |
| Lawton Storage Limited | Transport & logistics | 2025 |
| Layer Wellness Ltd | Other services | 2026 |
| Layr Floors Ltd | Construction | 2026 |
| Lazy Lakes Camping and Tearooms Limited | Agriculture & fishing | 2025 |
| Lazzat Limited | Hospitality | 2021 |
| LBF Management Ltd | Construction | 2025 |
| LBG Trading Ltd | Wholesale & retail | 2025 |
| LBI Accountancy & PA Services Ltd | Administrative & support | 2022 |
| LBI Consulting Ltd | Professional & scientific | 2018 |
| Lbudge Ltd | Construction | 2020 |
| LC Employment Ltd | Administrative & support | 2026 |
| LCB Management Services Limited | Professional & scientific | 2016 |
| LCG Estates Limited | Real estate | 2022 |
| LCH Grading Limited | Professional & scientific | 2015 |
| LCJ Investment and Consultancy Limited | Professional & scientific | 2025 |
| LCW Accounting Ltd | Professional & scientific | 2019 |
| LD Constructions Ltd | Construction | 2017 |
| LD Distribution Kent Limited | Wholesale & retail | 2025 |
| LD Heating Kent Ltd | Construction | 2022 |
| LD Landscaping & Groundworks Limited | Construction | 2004 |
| LD Technical Management Solutions Limited | Professional & scientific | 2020 |
| LDH Global Limited | Construction | 2015 |
| LDM Electrics Ltd | Construction | 2025 |
| LDN Entertainment Limited | Arts & recreation | 2017 |
| LE Recruitment Ltd | Professional & scientific | 2023 |
| Lead Air-Conditioning Ltd | Construction | 2019 |
| Leader Comms Limited | Professional & scientific | 2014 |
| Leadership Training Services Limited | Administrative & support | 2023 |
| Leading Light Recruitment Ltd | Administrative & support | 2026 |
| Leading Personal Trainers Limited | Extraterritorial | 2013 |
| Leafletskent Ltd | Transport & logistics | 2024 |
| Leah's Bistro Limited | Hospitality | 2017 |
| Leak Safe Solutions Limited | Wholesale & retail | 2012 |
| Learn Closer Ltd | Education | 2025 |
| Learn to Support Ltd | Health & social care | 2023 |
| Learn Wths Ltd | Information & communication | 2022 |
| Lease Law Limited | Professional & scientific | 2019 |
| Lease Profiles Limited | Financial services | 2012 |
| Leasemorecar.Co.Uk Limited | Administrative & support | 2024 |
| Lec-Etec Solutions Limited | Administrative & support | 2014 |
| Leda Scaffolding Limited | Construction | 2006 |
| Ledger Bennett Limited | Professional & scientific | 1981 |
| Ledger Bennett Revenue Engine Limited | Professional & scientific | 2017 |
| LEE Building & Maintenance Limited | Construction | 2023 |
| Leesons Pro Builders Ltd | Construction | 2022 |
| Leetsco Kent Ltd | Wholesale & retail | 2025 |
| Leeward Construction Electrical Services Limited | Construction | 2021 |
| Leeward Group Ltd | Construction | 2024 |
| Leftis Cleaning Ltd | Administrative & support | 2026 |
| Legacy Air Conditioning Ltd | Construction | 2026 |
| Legacy Lives on Healthcare Ltd | Health & social care | 2025 |
| Legacy Properties (Kent) Ltd | Construction | 2013 |
| Legacy Works Ltd | Manufacturing | 2026 |
| Legal & Ledger Ltd | Professional & scientific | 2025 |
| Legantib Ltd | Wholesale & retail | 2022 |
| Legendary Events Ltd | Professional & scientific | 2015 |
| Leggat Farming Limited | Agriculture & fishing | 2019 |
| Legletate Limited | Construction | 2015 |
| Leicester Property Investments Limited | Financial services | 2017 |
| Leipa UK Limited | Wholesale & retail | 2003 |
| Leisure Park GAS Ltd | Construction | 2021 |
| Leitrim Limited | Construction | 1992 |
| Leka 4 Ltd | Real estate | 2023 |
| LEM Property Ltd | Real estate | 2017 |
| Lembo SET Limited | Construction | 2013 |
| Lemont of London Limited | Wholesale & retail | 2005 |
| LEN Price 3 Limited | Information & communication | 2025 |
| LEN Valley Design and Build Ltd | Construction | 2021 |
| LEN Valley Plumbing Ltd | Construction | 2024 |
| LEN Valley Property Investments Ltd | Real estate | 2025 |
| Lengths by Lottie Ltd | Other services | 2025 |
| Lenham Focus | Information & communication | 2017 |
| Lenham Village Car Ltd | Transport & logistics | 2024 |
| Lenham. Tyre Shop Ltd | Wholesale & retail | 2022 |