| LEAH24 Ltd | Transport & logistics | 2021 |
| Left Foot Forward Ltd | Information & communication | 2009 |
| Legend Ceramics Limited | Wholesale & retail | 2002 |
| Legends Nutrition 2018 Ltd | Wholesale & retail | 2018 |
| Leigh Brickwork Contractors Ltd | Construction | 2015 |
| Leighton Custom Interiors Limited | Construction | 2021 |
| Lemonbody.Com Limited | Arts & recreation | 2012 |
| Lendiq Ltd | Financial services | 2011 |
| Lenscap Ltd | Wholesale & retail | 2025 |
| Leonion Ltd | Health & social care | 2025 |
| LET Cleaners Ltd | Wholesale & retail | 2025 |
| Letts 4 U Limited | Financial services | 2019 |
| Level UP Performance Limited | Arts & recreation | 2025 |
| Levels Brunch Co Ltd | Hospitality | 2024 |
| Leximed Ltd | Professional & scientific | 2026 |
| Lexpark Limited | Professional & scientific | 2003 |
| LG Commercial Law Limited | Professional & scientific | 2013 |
| LGK Holdings Limited | Professional & scientific | 2025 |
| LGS Developers Limited | Construction | 2013 |
| Liam Perry Limited | Information & communication | 2012 |
| Lichfield Media Factory Ltd | Professional & scientific | 2014 |
| Lichfield Radio Limited | Information & communication | 2025 |
| Lickgelato Ltd | Manufacturing | 2015 |
| Lifestyle Lettings Ltd | Real estate | 2018 |
| Light Through the Dark CIC | Wholesale & retail | 2026 |
| Lighton Testing Ltd | Professional & scientific | 2017 |
| Lime Capital Finance Limited | Financial services | 2009 |
| Limebug Limited | Wholesale & retail | 2010 |
| Limelight Marketing Communications Limited | Professional & scientific | 1993 |
| Limen Holdings Ltd | Manufacturing | 2025 |
| Limitless Commerce Ltd | Wholesale & retail | 2024 |
| Limitless Development Ltd | Professional & scientific | 2022 |
| Lims 28 Limited | Hospitality | 2023 |
| Lindsay Graham Estate Agents Ltd | Real estate | 2015 |
| Line Markings Limited | Extraterritorial | 2011 |
| Lineage Consultancy Ltd | Education | 2026 |
| Lineage Hair Ltd | Other services | 2026 |
| Linkline Maintenance Services Limited | Extraterritorial | 2014 |
| Links PJ Supplies Limited | Wholesale & retail | 2024 |
| Lionel Ltd | Professional & scientific | 2018 |
| LIP Calm Ltd | Wholesale & retail | 2020 |
| Little Big House Limited | Professional & scientific | 2006 |
| Little Honeybees Ltd | Health & social care | 2019 |
| Little Stars (Westlands) Ltd | Education | 2009 |
| Little Steps Big Adventures Limited | Arts & recreation | 2025 |
| Live Notes Entertainment Ltd | Arts & recreation | 2025 |
| Live Well Accommodation Ltd | Hospitality | 2021 |
| Liverpool Canning Company Limited | Manufacturing | 2018 |
| Liya's Designing and Stitching Ltd | Wholesale & retail | 2025 |
| LJR Fleet Solutions Ltd | Wholesale & retail | 2026 |
| LJS Commercial Management Ltd | Professional & scientific | 2022 |
| LME Solution Group Ltd | Professional & scientific | 2022 |
| LMS Accountancy Limited | Professional & scientific | 2022 |
| Lo-Co Motive International Ltd | Administrative & support | 2013 |
| Loadpath Ltd | Construction | 2026 |
| Loadstar Distribution Ltd | Wholesale & retail | 2025 |
| Lockwood Capital Limited | Financial services | 2020 |
| Logisticar Ltd | Transport & logistics | 2025 |
| Logo Co (NE) Ltd | Other services | 2014 |
| London Bright Home Ltd | Real estate | 2016 |
| Longacres Consulting Limited | Administrative & support | 2008 |
| Longcape Limited | Professional & scientific | 1981 |
| Longridge Property Portfolio Limited | Real estate | 2017 |
| Loomer Medical Limited | Health & social care | 2011 |
| Lords Global Trade Ltd | Wholesale & retail | 2025 |
| Loredana Malanca Ltd | Transport & logistics | 2020 |
| Lorna Bailey Limited | Professional & scientific | 2005 |
| Louis and SON Contractors Ltd | Construction | 2025 |
| Louis Taylor Fine Art Auctioneers Ltd | Professional & scientific | 2014 |
| Louis Taylor Limited | Real estate | 2010 |
| Love and Latte Playcafe Ltd | Manufacturing | 2025 |
| Lovederly Care Limited | Administrative & support | 2023 |
| Lovenia Ltd | Hospitality | 2020 |
| Lovett 2 FH Developments Limited | Financial services | 2024 |
| Lovett 2 FH Opco Ltd | Health & social care | 2026 |
| Lovett Care (Carlisle) Ltd | Construction | 2019 |
| Lovett Care (Market Drayton) Ltd | Construction | 2025 |
| Lovett Care Developments (Abingdon) Ltd | Construction | 2024 |
| Lovett Care Developments (Maldon) Ltd | Construction | 2024 |
| Lovett Care Developments (Newport) Ltd | Construction | 2024 |
| Lovett Care Developments (Southend) Ltd | Construction | 2024 |
| Lovett Care FH (Opco) Ltd | Health & social care | 2025 |
| Lovett Care LH Developments Ltd | Financial services | 2025 |
| Lovett Care Management Ltd | Professional & scientific | 2022 |
| LP MED Ltd | Manufacturing | 2025 |
| Lpgb LLC | | 2023 |
| LR Cope Consultancy Limited | Administrative & support | 2016 |
| LRM Building Limited | Construction | 2019 |
| LRR Group Ltd | Administrative & support | 2019 |
| Lsgp Limited | Construction | 2026 |
| LT Harrison Ltd | Real estate | 2021 |
| Lucky Pings Limited | Hospitality | 2025 |
| Lucky Thai Ltd | Hospitality | 2019 |
| Luggage Extra Limited | Information & communication | 2023 |
| Luigi Motors Ltd | Wholesale & retail | 2022 |
| Lula Media Ltd | Professional & scientific | 2024 |
| Lumiere Trading Ltd | Real estate | 2024 |
| Lumo Property Limited | Real estate | 2015 |
| Luna Pilates Limited | Arts & recreation | 2025 |
| Luther Marketing Group Limited | Information & communication | 2017 |