| Ladlow Limited | Arts & recreation | 2012 |
| Lagdens Seafood Ltd | Wholesale & retail | 2018 |
| Lagg Trading Limited | Wholesale & retail | 2021 |
| Lake Digital Limited | Information & communication | 2010 |
| Lakeross Limited | Wholesale & retail | 2021 |
| Lakeside Crescent Limited | Extraterritorial | 1997 |
| Lakeside Events Nottingham Limited | Administrative & support | 2020 |
| Lakeview Court Limited | Households | 1981 |
| Lakewind Apartments Ltd | Hospitality | 2018 |
| Lali Software Technologies Ltd | Information & communication | 2013 |
| Lambourne Connect Ltd | Education | 2016 |
| Lambourne Road Maisonettes Residents Association Limited | Other services | 1996 |
| Lambri Tools Limited | Administrative & support | 2010 |
| Lambton Tyrell Limited | Wholesale & retail | 2016 |
| Land Scope Limited | Administrative & support | 2020 |
| Land Screen Limited | Professional & scientific | 1997 |
| Landlord Maintenance Services Limited | Construction | 2018 |
| Landlord Refurbishments Limited | Construction | 2018 |
| Landmark Assets UK Limited | Professional & scientific | 2014 |
| Landons Holdings Limited | Professional & scientific | 2021 |
| Landons Solicitors Limited | Professional & scientific | 2014 |
| Landy Developments Ltd | Construction | 2021 |
| Landy Portfolio Ltd | Financial services | 2021 |
| Landy Property Ltd | Real estate | 2021 |
| Lane 1 Training Centre Limited | Education | 2025 |
| Lane Kitchen Limited | Hospitality | 2018 |
| Lane Parker Group Limited | Administrative & support | 2024 |
| Laneze Limited | Administrative & support | 2013 |
| Langdales Property Limited | Real estate | 2006 |
| Langford Bridge Construction Limited | Construction | 2024 |
| Lannes Ltd | Manufacturing | 2014 |
| Lanther Black Limited | Information & communication | 2014 |
| Lapsley Frameworks Limited | Manufacturing | 2019 |
| Largemortgageloans.Com Limited | Administrative & support | 2004 |
| Largosse Limited | Hospitality | 2018 |
| Larrakeah Ltd | Professional & scientific | 2015 |
| Larsa Medical Ltd | Health & social care | 2016 |
| LAS Tapas Brentwood Ltd | Hospitality | 2018 |
| LAS Tapas Essex Ltd | Hospitality | 2025 |
| Lash & Glow Limited | Other services | 2020 |
| Latchets LLP | | 2021 |
| Late Tuesday Night Ltd | Wholesale & retail | 2024 |
| Latham (Beckton) (NO.2) Management Company Limited | Households | 1992 |
| Latitude 60.8 Ltd | Professional & scientific | 2024 |
| Launch Interactions Ltd | Information & communication | 2017 |
| Laundry & Latte Limited | Other services | 2018 |
| Laura Horton Consulting Limited | Professional & scientific | 2008 |
| Lauriston Capital Ltd | Other services | 2013 |
| Lausa Biragi Ltd | Other services | 2025 |
| Laven Limited | Health & social care | 2016 |
| Lavish Rhinos Limited | Real estate | 2022 |
| Law Pictures Limited | Professional & scientific | 2008 |
| Lawford Developing Limited | Construction | 2020 |
| Lawlor Property Management Limited | Real estate | 2001 |
| Lazaro Group Ltd | Administrative & support | 2025 |
| LB Books Limited | Professional & scientific | 2015 |
| LB Carpentry & Joinery Ltd | Construction | 2022 |
| LBD Holdings Limited | Information & communication | 2026 |
| LBR Carpentry & Construction Ltd | Construction | 2025 |
| LCS Recruitment Ltd | Administrative & support | 2025 |
| LDF Brickwork Ltd | Construction | 2021 |
| LDN Leadwork Ltd | Construction | 2016 |
| LDN SOS Ltd | Construction | 2020 |
| Leachlettings Limited | Real estate | 2024 |
| Leadership and Empowerment Solutions Ltd | Professional & scientific | 2019 |
| Leaf Holdings (UK) Limited | Professional & scientific | 2012 |
| Leather Hero Ltd | Administrative & support | 2024 |
| LEE Ellis and SON Ltd | Construction | 2017 |
| LEE Optics Ltd | Health & social care | 2019 |
| Lee's Diner Ltd | Hospitality | 2019 |
| Leemar Systems Ltd | Information & communication | 2025 |
| Leesons Property Ltd | Construction | 2016 |
| Legal Lottie Limited | Professional & scientific | 2023 |
| Legal Resolutions Limited | Professional & scientific | 2009 |
| Legal Surveyors UK Limited | Professional & scientific | 2018 |
| Legally Empowered Limited | Professional & scientific | 2024 |
| Legend Portfolio Limited | Real estate | 2018 |
| Legends Boxing Academy Limited | Arts & recreation | 2016 |
| Legion Scaffolding Limited | Construction | 2012 |
| Leila Limited | Hospitality | 2025 |
| Leio Health Ltd | Health & social care | 2026 |
| Lekha Tech Limited | Information & communication | 2025 |
| Lemi Clothing Ltd | Wholesale & retail | 2009 |
| Lemonadeldn Ltd | Other services | 2018 |
| Leon Jaeggi & Sons Limited | Wholesale & retail | 1947 |
| Leona Enterprises Ltd | Wholesale & retail | 2009 |
| Leons Militaria Ltd | Professional & scientific | 2011 |
| Lepath Consultancy Ltd | Professional & scientific | 2023 |
| LET & Sell Property Solutions Ltd | Real estate | 2025 |
| LET IT BE Property Ltd | Real estate | 2021 |
| Lets Go Crazy Holdings Limited | Professional & scientific | 2011 |
| Levain Bakehouse Ltd | Wholesale & retail | 2025 |
| Level Acre Developments Ltd. | Administrative & support | 2016 |
| Lewis Brickwork Contractors Ltd | Construction | 2016 |
| Lexgrove Properties Limited | Construction | 2015 |
| Lexton Consulting Ltd | Professional & scientific | 2020 |
| Leysop Limited | Manufacturing | 1993 |
| LFB Studio Ltd | Professional & scientific | 2021 |
| Lfja Lettings Limited | Real estate | 2026 |
| LG Roof Consultancy Ltd | Construction | 2019 |