| Lingalonga Limited | Hospitality | 2017 |
| Linguish Limited | Education | 2016 |
| Link Think Ltd | Professional & scientific | 2025 |
| Linklater Warren Ltd | Wholesale & retail | 2013 |
| Linktia Infosystems Limited | Information & communication | 2020 |
| Linton Street Freehold Company Limited | Real estate | 2015 |
| Lion and Leinster Construction Ltd | Construction | 2024 |
| Lion and Leinster Investments Ltd | Construction | 2017 |
| Lion and Leinster Refurbishments Ltd | Professional & scientific | 2026 |
| Lionhouse Industries Ltd | Construction | 2020 |
| Liquid Asset Group Ltd | Wholesale & retail | 2023 |
| Liquid Vision Enterprise Limited | Manufacturing | 2011 |
| Lisa Care Services Limited | Health & social care | 2013 |
| Lisas Gems Limited | Wholesale & retail | 2020 |
| Lisa’S Cleaning Limited | Administrative & support | 2025 |
| Liscot International Ltd | Wholesale & retail | 2009 |
| Liskeard Holdings Ltd | Financial services | 2025 |
| Little Bay Consulting Ltd | Other services | 2016 |
| Little Bean Ricky Limited | Professional & scientific | 2016 |
| Little Big Sports Ltd | Wholesale & retail | 2010 |
| Little Blue Finch (Home) Ltd | Wholesale & retail | 2021 |
| Little Blue Finch Ltd | Wholesale & retail | 2015 |
| Little Copse Limited | Professional & scientific | 2020 |
| Little Covent Garden (Sittingbourne) Limited | Real estate | 1966 |
| Little Elses (Weald) Ltd | Professional & scientific | 2024 |
| Little Lantern Play Therapy Ltd | Health & social care | 2025 |
| Little Linens Ltd | Other services | 2005 |
| Little Maples Ltd | Health & social care | 2026 |
| Little Scribblings Management Company Limited | Professional & scientific | 2002 |
| Live Line Electrics Ltd | Construction | 2025 |
| LIZ Roberts Limited | Professional & scientific | 2011 |
| LJB Maintenance Limited | Construction | 2014 |
| LJM Auto Repairs Limited | Wholesale & retail | 2012 |
| LK Inspection Limited | Administrative & support | 2020 |
| LKE Installations Limited | Administrative & support | 2019 |
| LLT Consultancy Ltd | Professional & scientific | 2023 |
| LM Computing Limited | Information & communication | 2012 |
| Lmba Ltd | Professional & scientific | 2024 |
| LMM Contracting Ltd | Professional & scientific | 2017 |
| LND UK Commercial Mortgages 2 Limited | Real estate | 2025 |
| LNS Care Ltd | Professional & scientific | 2013 |
| LNS Corals Ltd | Professional & scientific | 2021 |
| Loadfast Products Ltd | Wholesale & retail | 1990 |
| Loadspear Media Limited | Information & communication | 2005 |
| Lock Bros (Plant Hire) Limited | Administrative & support | 1993 |
| Lock Bros. (Haulage) Limited | Water & waste | 2004 |
| Lock Brothers Limited | Transport & logistics | 1982 |
| Lockyer Group Limited | Wholesale & retail | 2024 |
| Locx IP Ltd | Construction | 2022 |
| Locx System Limited | Construction | 2025 |
| Lodavoice Ltd | Transport & logistics | 2021 |
| Lodge Cleaning Services Limited | Administrative & support | 2005 |
| Logans Logs Ltd | Agriculture & fishing | 2024 |
| Logie Properties Limited | Real estate | 2021 |
| Logsdons Ltd | Transport & logistics | 2025 |
| Lola Olofin Limited | Professional & scientific | 2020 |
| London & City (TS) Locks Limited | Administrative & support | 2010 |
| London & Kent Air Conditioning Limited | Construction | 2001 |
| London & Kent Technical Services Limited | Construction | 2018 |
| London & Scottish International Limited | Wholesale & retail | 1994 |
| London & Scottish Spirits Limited | Wholesale & retail | 1992 |
| London AI United College Ltd | Education | 2025 |
| London Campers Limited | Manufacturing | 2009 |
| London City Swing Ltd. | Arts & recreation | 2015 |
| London Contemporary Visual Arts Network C.I.C. | Arts & recreation | 2024 |
| London Corporate Jets Ltd | Transport & logistics | 2006 |
| London Elite Services Limited | Transport & logistics | 2022 |
| London Golf and Padel Group Ltd | Arts & recreation | 2024 |
| London House (Crowborough) Limited | Construction | 2016 |
| London Plumbing Repairs Ltd | Construction | 2020 |
| London Road Car Care Ltd | Wholesale & retail | 2026 |
| London Road Service Station Limited | Wholesale & retail | 1997 |
| London Rose Limited | Manufacturing | 2022 |
| London Shredding Ltd | Water & waste | 2025 |
| London Smart Engineers Ltd | Manufacturing | 2019 |
| Long Time Dead Productions Ltd | Information & communication | 2020 |
| Longfield Bakery Limited | Manufacturing | 2023 |
| Longford House (Holdings) Limited | Financial services | 2021 |
| Longhouse Foods Ltd | Hospitality | 2024 |
| Longridge Law Limited | Professional & scientific | 2023 |
| Lonsdale Emerald Limited | Real estate | 2014 |
| Look NO Further Ltd | Arts & recreation | 2026 |
| Look UP Communications Ltd | Professional & scientific | 2018 |
| Loose Moose Productions Limited | Other services | 2007 |
| Lord Associates Limited | Professional & scientific | 1997 |
| Lorden Pads Limited | Real estate | 2023 |
| Loss 2 Gain Limited | Information & communication | 2020 |
| Lost and Damned Gaming Ltd | Arts & recreation | 2017 |
| Lottie Dennis Ltd | Professional & scientific | 2024 |
| Louise Gulley Counselling, Couples & Consultancy Ltd | Health & social care | 2026 |
| Louise Whittington Limited | Other services | 2005 |
| Louisetoddcomms Limited | Education | 2023 |
| Love of Wood Ltd | Manufacturing | 2021 |
| Lovegrove Consultancy Ltd | Administrative & support | 2016 |
| Loves 2 EAT Ltd | Hospitality | 2023 |
| Lowndes Limited | Administrative & support | 1988 |
| Loxal Security Limited | Administrative & support | 2009 |
| Loxwood Construction Kent Limited | Construction | 2024 |
| LPS Holdco Limited | Financial services | 2023 |
| LS & RMS Property Ltd | Real estate | 2026 |