| Laelaps AI Ltd | Professional & scientific | 2023 |
| Laichi Foods Ltd | Manufacturing | 2021 |
| Lailuma and Marjan Limited | Wholesale & retail | 2023 |
| Laitt Medical Ltd. | Health & social care | 2010 |
| Lake Design (UK) Limited | Professional & scientific | 1998 |
| Lake District Lodge Holidays Ltd | Administrative & support | 2013 |
| Lake District Tubing Limited | Arts & recreation | 2023 |
| Lake Forest Ltd | Manufacturing | 2023 |
| Lakshmi DV Limited | Real estate | 2016 |
| Lakshmi Enterprises Limited | Real estate | 2003 |
| Lama Zein Ltd | Health & social care | 2024 |
| Lamaar Food Limited | Wholesale & retail | 2022 |
| Lamb Enterprises Limited | Information & communication | 1995 |
| Lambda Learning Ltd | Education | 2022 |
| Lambert Smith Hampton (City) Limited | Professional & scientific | 1976 |
| Lambert Smith Hampton Group (Overseas) Limited | Professional & scientific | 1990 |
| Lambtrack Limited | Professional & scientific | 2007 |
| Lami Doors UK Limited | Professional & scientific | 1997 |
| Lamont Aviation Limited | Professional & scientific | 2026 |
| Lamour Cake Ltd | Manufacturing | 2022 |
| Lamp Films Limited | Administrative & support | 2005 |
| LAN LAN Ltd | Real estate | 2006 |
| Lana Filippova Interiors Limited | Construction | 2017 |
| Lancashire Behaviour Support Consultancy Limited | Health & social care | 2026 |
| Lancashire Electrical Distributors Limited | Wholesale & retail | 1984 |
| Lancaster Moor Management Company (1) Limited | Households | 2013 |
| Lancaster Moor Park Leasehold Management Company Limited | Households | 2017 |
| Lancaster Moor Park Management Company Limited | Households | 2016 |
| Lancaster Partners (Holdings) Limited | Professional & scientific | 1970 |
| Lancaster Properties Limited | Real estate | 1989 |
| Land & Development Group Ltd | Construction | 2015 |
| Land and Property Trading Co. Limited | Real estate | 1987 |
| Land Law LLP | | 2007 |
| Land Law Solicitors Limited | Professional & scientific | 1998 |
| Land Remediation Specialists Limited | Professional & scientific | 2023 |
| Landcare ( Stockport) Ltd | Construction | 2015 |
| Landcove Property Developments Limited | Real estate | 2015 |
| Landfair Capital Limited | Financial services | 2020 |
| Landman Properties Ltd | Real estate | 2024 |
| Landmarka Limited | Real estate | 2023 |
| Landscape Design and Build Ltd | Administrative & support | 2025 |
| Landstra Ltd | Real estate | 2025 |
| Lane Estates Altrincham Limited | Real estate | 2020 |
| Langbourne Investments Ltd | Financial services | 2016 |
| Langdale Capital (Windermere) Limited | Real estate | 2021 |
| Langdale Capital Holdings Limited | Real estate | 2018 |
| Langford Bluegrass Limited | Professional & scientific | 2017 |
| Langham Family Investment Company Limited | Financial services | 2025 |
| Langham Mount Management Limited | Households | 1993 |
| Langley Land Partnership | | 2001 |
| Langsett Road Limited | Real estate | 2026 |
| Language Connect International Ltd | Professional & scientific | 2010 |
| Lansec Solutions Ltd | Information & communication | 2018 |
| Lantops Property Solutions Ltd | Real estate | 2024 |
| Lapwing Lane Holdings Ltd | Financial services | 2020 |
| Lapwing Lane Management Company Limited | Households | 2003 |
| LAR Joinery Limited | Manufacturing | 2019 |
| Larice Stielow Limited | Professional & scientific | 2023 |
| Lasaha Healthcare Ltd | Health & social care | 2020 |
| Laserworld UK Limited | Professional & scientific | 2012 |
| Lashesbrows Bolton Ltd | Other services | 2020 |
| Lasting Space UK Ltd. | Information & communication | 2026 |
| Latent Labs Limited | Professional & scientific | 2023 |
| Latentspace AI Ltd | Information & communication | 2023 |
| Lateral Dental Clinic Limited | Health & social care | 2024 |
| Latham Hall Management Company Limited | Households | 2017 |
| Latin DJS Limited | Information & communication | 2019 |
| Latitude Growth Solutions Ltd | Professional & scientific | 2026 |
| Latitude Manco Limited | Real estate | 2020 |
| Latium Dormants Limited | Professional & scientific | 2014 |
| Latium Dreamview Limited | Construction | 2015 |
| Latium Enterprises International Ltd | Professional & scientific | 2014 |
| Latium Enterprises Limited | Information & communication | 2014 |
| Latium Helicopter Charters Limited | Transport & logistics | 2002 |
| Latium Investments | Financial services | 2024 |
| Latium IT Limited | Information & communication | 2012 |
| Latium Management Services Limited | Professional & scientific | 2001 |
| Latium Medical Limited | Health & social care | 2005 |
| Latium Pinewood Limited | Professional & scientific | 2013 |
| Latium Plastics Enterprises Limited | Professional & scientific | 2010 |
| Latium RE LLP | | 2023 |
| Latium Real Estate Limited | Real estate | 2022 |
| Latium Research Holdco Limited | Financial services | 2022 |
| Latium Research Limited | Professional & scientific | 2022 |
| Latium Stone Limited | Professional & scientific | 2017 |
| Latium Tech Holdco Limited | Financial services | 2020 |
| Latium Tech Limited | Information & communication | 2017 |
| Latium Tech Topco Limited | Financial services | 2022 |
| Latium USA Partnership 1 Limited | Professional & scientific | 2006 |
| Latium USA Partnership 2 Limited | Professional & scientific | 2006 |
| Latticeflow UK Ltd | Professional & scientific | 2023 |
| Lauccia Ltd | Wholesale & retail | 2024 |
| Launch and Scale Consulting Limited | Professional & scientific | 2025 |
| Laundry Efficiency Ltd | Water & waste | 2017 |
| Laundry Plus Limited | Other services | 2024 |
| Laura Hartley Recruitment Ltd | Administrative & support | 2009 |
| Laura P Ltd | Other services | 2023 |
| Laura Pearson Locums Limited | Health & social care | 2017 |
| Laura Wood Ltd | Health & social care | 2011 |
| Laurel Limited | Construction | 1984 |