| Kyla Ltd | Real estate | 2023 |
| L & D Residential Ltd | Real estate | 2025 |
| L & I Pugh Properties Limited | Real estate | 2017 |
| L Beldom Limited | Water & waste | 2012 |
| L&C Cleanings Services Ltd | Administrative & support | 2025 |
| L&H NO.2 Limited | Real estate | 2023 |
| L&N Consultancy Ltd | Professional & scientific | 2025 |
| L&R Estate Group Ltd | Real estate | 2025 |
| L&S Fashion Connection Limited | Wholesale & retail | 2013 |
| L.& R.Investments(Hendon)Limited | Real estate | 1951 |
| L4G Ltd | Information & communication | 2022 |
| LA Bella Services Limited | Public administration | 2021 |
| LA Bufala Trading Limited | Wholesale & retail | 1996 |
| LA Gloria Mexicana Ltd | Hospitality | 2021 |
| LA Highways Ltd | Administrative & support | 2019 |
| LA Mariuca Ltd | Wholesale & retail | 2018 |
| LA Patrons Enterprise Limited | Hospitality | 2026 |
| Laben Consulting Limited | Professional & scientific | 2023 |
| Labfern Limited | Real estate | 1985 |
| Labh Lakshmi Limited | Hospitality | 2024 |
| Labour Merchant Limited | Information & communication | 2017 |
| Labourforce Limited | Construction | 1989 |
| Labzero Technologies Limited | Information & communication | 2023 |
| LAD Construct Ltd | Construction | 2024 |
| LAD Estate Management Limited | Real estate | 2016 |
| Ladumor Limited | Hospitality | 2025 |
| Lady Musgrave Limited | Hospitality | 2005 |
| Laghman Trading Ltd | Wholesale & retail | 2022 |
| Lahcen Care Limited | Health & social care | 2025 |
| Lahore Kathi Roll Limited | Hospitality | 2025 |
| Lakatamia German Shepherds Limited | Professional & scientific | 2002 |
| Lakeland Utilities Limited | Construction | 2020 |
| Lakeside Living Ltd | Real estate | 2025 |
| Lakeview Residents' Association (Camberley) Limited | Households | 1981 |
| Laksh Properties Ltd | Real estate | 2014 |
| Lalbot Developments Limited | Real estate | 2018 |
| Lallet Ltd | Arts & recreation | 2023 |
| Lamai Rail Ltd | Construction | 2021 |
| Lamanico Ltd | Wholesale & retail | 2016 |
| Lamptrend Limited | Real estate | 1985 |
| Lamu Investments Ltd | Other services | 2015 |
| Landbow Ltd | Wholesale & retail | 2025 |
| Landmark Auctions Limited | Wholesale & retail | 2021 |
| Landpac Ground Engineering Limited | Construction | 2001 |
| Landpac Ground Improvement Technologies Investment Ltd | Administrative & support | 2023 |
| Landsdowne Court Bushey Management Limited | Real estate | 2013 |
| Lane Lodging Limited | Real estate | 2024 |
| Lane Residential Limited | Real estate | 2016 |
| Lang Balloons (U.K.) Limited | Manufacturing | 1988 |
| Langham Grove Limited | Construction | 2016 |
| Langley Property(Slough) Limited | Construction | 2025 |
| Lankika Lions Cricket Club & Academy Ltd | Education | 2026 |
| Lankom Petroleum Ltd | Wholesale & retail | 2026 |
| Lansdowne Estates Limited | Real estate | 2020 |
| Larry Park Limited | Construction | 1997 |
| Larsdown Limited | Real estate | 2008 |
| Larx Events Limited | Arts & recreation | 2024 |
| Laser Medic Ltd | Other services | 2025 |
| Laskier Associates Limited | Information & communication | 2010 |
| Lattelounge.Co Limited | Information & communication | 2017 |
| Laural Developments Ltd | Construction | 2024 |
| Laural Holdings Ltd | Financial services | 2022 |
| Laurell Investments Ltd | Real estate | 2021 |
| Laurence Barrett Associates Ltd | Professional & scientific | 2012 |
| Lavender Investing Ltd | Real estate | 2018 |
| Law on Web Limited | Professional & scientific | 2000 |
| Lawless Living Limited | Real estate | 2025 |
| Lawless Property Solutions Ltd | Real estate | 2021 |
| LAX Advisors Limited | Other services | 2017 |
| Laxkan Holdings Ltd | Other services | 2016 |
| Laxkan Ltd | Other services | 2016 |
| LAYER37 Ltd. | Information & communication | 2012 |
| Lazordlondon Ltd | Administrative & support | 2017 |
| LBR Dental Ltd | Health & social care | 2026 |
| Lbsuk Limited | Construction | 2025 |
| LCA Partners Limited | Professional & scientific | 2015 |
| LCB London Ltd | Wholesale & retail | 2024 |
| LCM Ventures Ltd | Real estate | 2018 |
| LCT Group Ltd | Construction | 2025 |
| LCW11 Limited | Real estate | 2013 |
| LD Training Services Limited | Administrative & support | 2009 |
| Ldnfoods Ltd | Wholesale & retail | 2020 |
| LE Renaissance Ltd | Information & communication | 2025 |
| Leader R J Ltd | Professional & scientific | 2024 |
| Leadingedge Quality Ltd | Professional & scientific | 2018 |
| Leaf Global Ltd | Administrative & support | 2021 |
| Leama & Farhan Investments Ltd | Real estate | 2026 |
| Lean Ltd | Hospitality | 2026 |
| Leandra Baby Care Limited | Wholesale & retail | 2026 |
| Leapfrog Holdings Limited | Real estate | 2021 |
| Leapman Exports Limited | Wholesale & retail | 1968 |
| Leapways UK Limited | Real estate | 2022 |
| Lebnon ( UK ) Limited | Hospitality | 2018 |
| Ledangel Limited | Wholesale & retail | 2024 |
| Legal Links Limited | Real estate | 2003 |
| Leila Luxe Estates Ltd | Real estate | 2025 |
| Lekokoa (UK) Ltd | Manufacturing | 2026 |
| Lemanoosh Limited | Information & communication | 2015 |
| Lemni Ltd | Construction | 2010 |
| Lemonieo Ltd | Professional & scientific | 2009 |