| Ligo Solutions Limited | Information & communication | 2025 |
| Lilac Studio Limited | Other services | 2015 |
| Lime Kiln Road 1967 Limited | Extraterritorial | 2014 |
| Limitless Lifestyle Competitions Limited | Wholesale & retail | 2025 |
| Limosaero Limited | Professional & scientific | 2020 |
| Lin-As & KO Ltd | Transport & logistics | 2017 |
| Lincs Wifi Ltd | Extraterritorial | 2023 |
| Lindames Poultry Limited | Manufacturing | 1998 |
| Lindhurst Homes Limited | Hospitality | 2018 |
| Ling Mortgage & Financial Services Ltd | Financial services | 2021 |
| Ling's Country Goods Limited | Wholesale & retail | 2014 |
| Link Training Limited | Professional & scientific | 2018 |
| Linked Construction Limited | Construction | 2021 |
| Linked Engineering Limited | Professional & scientific | 2017 |
| Linked Holdings Limited | Financial services | 2021 |
| Lisa Rhodes Limited | Professional & scientific | 2014 |
| Litcham Deli Limited | Hospitality | 2025 |
| Litcham PO Limited | Wholesale & retail | 2015 |
| Little Fish Aquatics UK LLP | | 2023 |
| Little Village Creating Curious Minds Ltd | Arts & recreation | 2026 |
| Littleworld Day Nurseries Limited | Education | 1989 |
| Litur Limited | Hospitality | 2014 |
| Livifer Limited | Health & social care | 2026 |
| Livona London Limited | Other services | 2026 |
| LJ Coastal Lettings Ltd | Hospitality | 2025 |
| Ljbrkb Ltd | Real estate | 2024 |
| LJS Bookkeeping & Business Support Services Limited | Professional & scientific | 2016 |
| LKW Lettings Ltd | Real estate | 2023 |
| LKW Storage Ltd | Administrative & support | 2023 |
| LL Developments (Norfolk) Limited | Construction | 2019 |
| LL Management (Holt) Limited | Households | 2021 |
| Llwynonn Limited | Professional & scientific | 2019 |
| Lmjb Limited | Hospitality | 2009 |
| Loades for Loads Limited | Transport & logistics | 1964 |
| Loades Management Limited | Professional & scientific | 2018 |
| Loades Property Management Limited | Real estate | 2018 |
| Lobster Enterprises Ltd | Administrative & support | 2011 |
| Local Free Media Ltd | Information & communication | 2025 |
| Local IT Support Ltd | Information & communication | 2025 |
| Locomattive Models Ltd | Wholesale & retail | 2023 |
| Logie-Tec.Com Limited | Information & communication | 2003 |
| Logistics Line Ltd | Transport & logistics | 2024 |
| LOH Company Limited | Hospitality | 2025 |
| London General Motor CAB Company Ltd | Professional & scientific | 2018 |
| London Petroleum Solutions Limited | Mining & quarrying | 2016 |
| Long & Sons (Norfolk) Limited | Agriculture & fishing | 2022 |
| Longmeadow Great Bircham Management Co Limited | Extraterritorial | 2019 |
| Longmeadow Machinery Sales Limited | Professional & scientific | 2018 |
| Longuinn Ltd | Wholesale & retail | 2003 |
| Lord Napier Limited | Hospitality | 2019 |
| Lorrupcal Limited | Health & social care | 2023 |
| Losi Limited | Professional & scientific | 2011 |
| Losinga Road Convenience Store Ltd | Wholesale & retail | 2018 |
| Lotus Flooring Ltd | Construction | 2019 |
| LOU CAN Bake Limited | Manufacturing | 2023 |
| Louie's Hand Car Wash Ltd | Other services | 2014 |
| Loved Office Furniture Ltd | Wholesale & retail | 2021 |
| Lower Farm Mews Management Limited | Households | 2025 |
| Lpdf Properties Ltd | Real estate | 2025 |
| LPH Trading Ltd | Professional & scientific | 2026 |
| LR Engineering Design Ltd | Professional & scientific | 2026 |
| Lskj Design Engineers Ltd | Professional & scientific | 2016 |
| Luco Wellness Limited | Other services | 2025 |
| Lucy Carter Lighting Ltd | Arts & recreation | 2023 |
| Ludmila Limited | Hospitality | 2023 |
| Luele Ltd | Manufacturing | 2023 |
| Luke Thompson Financial Services Ltd | Financial services | 2022 |
| Lullaby Sea Ltd | Education | 2025 |
| Luma Dating Ltd | Information & communication | 2026 |
| Luminate Property Ltd | Hospitality | 2024 |
| Lunariq Ltd | Other services | 2025 |
| Lush Holdings Ltd | Real estate | 2024 |
| LUX Vestra Ltd | Professional & scientific | 2024 |
| Luxe Home Improvements Limited | Construction | 2025 |
| Luxury Dreamy Dwellings Limited | Construction | 2025 |
| Lv/Driving Ltd | Transport & logistics | 2025 |
| Lyana Barber Limited | Other services | 2025 |
| Lyford Consultancy Limited | Professional & scientific | 2019 |
| Lynconstruct Limited | Construction | 2002 |
| Lyndon Povey Limited | Professional & scientific | 2015 |
| Lynn Cabs Limited | Extraterritorial | 2008 |
| Lynn Carpet Centre Limited | Extraterritorial | 2009 |
| Lynn Catering Ltd | Hospitality | 2023 |
| Lynn Electrical Group Limited | Construction | 2023 |
| Lynn Electrical Services Limited | Construction | 2015 |
| Lynn Enterprises Limited | Wholesale & retail | 2007 |
| Lynn Foods Ltd | Hospitality | 2024 |
| Lynn Glaze Ltd | Construction | 2025 |
| Lynn Hand Car Wash Limited | Administrative & support | 2025 |
| Lynn Harvester Engineering Limited | Manufacturing | 2010 |
| Lynn Lead Generation Ltd | Professional & scientific | 2022 |
| Lynn Power Networks Ltd | Construction | 2025 |
| Lynn Property Solutions Ltd | Real estate | 2017 |
| Lynn Shellfish Limited | Agriculture & fishing | 1974 |
| Lynn Valeting Centre Ltd | Administrative & support | 2023 |
| Lynnframe Warm Roofs Division Limited | Construction | 2024 |
| Lynnfusion Ltd | Hospitality | 2024 |
| Lynntherm Limited | Construction | 2016 |
| Lyon & Lyon Creative Ltd | Professional & scientific | 2013 |
| M & a Development Ltd | Construction | 2002 |