| Lower Woodmanton Farm Limited | Real estate | 2023 |
| Lowrick Limited | Information & communication | 1999 |
| Loxbrook Barns Management Company Limited | Households | 2024 |
| LP Creations Limited | Construction | 2015 |
| LP Roofing & Cladding Ltd | Construction | 2012 |
| LPG Trans Ltd | Transport & logistics | 2026 |
| Lpmc Limited | Real estate | 2001 |
| LPS Vehicles Ltd | Wholesale & retail | 2025 |
| LPZ Property Limited | Real estate | 2018 |
| Lrms Property Holdings Ltd | Real estate | 2024 |
| LS Electrical South West Ltd | Construction | 2018 |
| LSB Property Management Ltd | Real estate | 2021 |
| LSP Property Group Limited | Real estate | 2019 |
| LSP Property Holding Limited | Real estate | 2019 |
| LSQ17 Ltd | Hospitality | 2021 |
| LSS Lettings Limited | Real estate | 2021 |
| LSW Legal Recruitment Ltd | Administrative & support | 2012 |
| Lsxy Consulting Limited | Information & communication | 2015 |
| LT Delivery Ltd | Transport & logistics | 2024 |
| LT Garage Limited | Wholesale & retail | 2022 |
| LT Garages (SW) Ltd | Wholesale & retail | 2024 |
| Ltg's Cafes and Bistros Limited | Hospitality | 2011 |
| LTS2021 Limited | Wholesale & retail | 1976 |
| Ltsl Enterprises Ltd | Administrative & support | 2021 |
| Lubanzi Health Care Services Ltd | Health & social care | 2023 |
| Luca BOS Limited | Real estate | 2015 |
| Lucas Carpenters Limited | Construction | 2006 |
| Lucas Parcel Ltd | Transport & logistics | 2018 |
| Luccombes Holdings Limited | Real estate | 2025 |
| Lucerna Magic Lantern Web Resource Community Interest Company | Information & communication | 2016 |
| Luchos Sports Ltd | Wholesale & retail | 2015 |
| Lucidcoral Ltd | Information & communication | 2023 |
| Lucie Simic Speaks Limited | Professional & scientific | 2024 |
| Lucius Ltd | Information & communication | 2024 |
| Luck 11 Ltd | Hospitality | 2019 |
| Lucky Chef BS5 Ltd | Hospitality | 2020 |
| Luckyshore Limited | Real estate | 2003 |
| Lucombe Park Management Company Limited | Households | 2019 |
| Lucy Acquisitions Limited | Financial services | 2019 |
| Lucy Goose Ltd | Wholesale & retail | 2024 |
| Ludwell Valley Roofing Ltd | Construction | 2019 |
| Luka Global Group Ltd | Administrative & support | 2023 |
| Lukas Barbers (Plymouth) Limited | Other services | 2017 |
| Lukas Products Limited | Manufacturing | 2018 |
| Luke Daysh Maintenance Ltd | Administrative & support | 2026 |
| Luke Pearce Ltd | Arts & recreation | 2024 |
| Luke Stone Marketing Ltd | Professional & scientific | 2023 |
| Luke Transport Ltd | Transport & logistics | 2024 |
| Lukes Farm Management Company Limited | Extraterritorial | 2023 |
| Luma Management Ltd | Financial services | 2026 |
| Lumb's Golden Bale Limited | Manufacturing | 2020 |
| Luminae Aesthetics Ltd | Health & social care | 2024 |
| Luminous Show Technology Limited | Manufacturing | 2017 |
| Lumos Solar Limited | Administrative & support | 2020 |
| Lumulo Limited | Financial services | 2024 |
| Luna and Wolf Ltd | Health & social care | 2020 |
| Luna Barbers 143 Ltd | Other services | 2025 |
| Luna Investment Bidco Limited | Financial services | 2025 |
| Luna Investment Midco I Limited | Financial services | 2025 |
| Luna Investment Midco II Limited | Financial services | 2025 |
| Luna Investment Topco Limited | Financial services | 2025 |
| Lunch Look Limited | Manufacturing | 2025 |
| Lusaa Security Solutions Ltd | Administrative & support | 2024 |
| Lusaa UK Ltd | Wholesale & retail | 2025 |
| Luso Clean Limited | Administrative & support | 2026 |
| Lusyi Ltd | Information & communication | 2024 |
| Lutzy's Limited | Hospitality | 2007 |
| LUX LAB Detailers LLP | | 2023 |
| Luxblue Ltd | Construction | 2013 |
| Luxe-Sa Limited | Real estate | 2020 |
| Luxora Management Ltd | Hospitality | 2025 |
| Luxperformance Remaps Ltd | Wholesale & retail | 2025 |
| Luxton Limited | Extraterritorial | 1935 |
| Luxton Mortgages Ltd | Financial services | 2026 |
| Luxury Air Limited | Wholesale & retail | 2020 |
| Luxury Coastal Limited | Hospitality | 2018 |
| Luxury Nails & Spa Ltd | Other services | 2018 |
| LUY Logistics Ltd | Transport & logistics | 2017 |
| LV Carpentry & Building Ltd | Manufacturing | 2021 |
| LWC Solutions Ltd | Professional & scientific | 2021 |
| LWH Property Ltd | Real estate | 2025 |
| LWR Property Ltd | Real estate | 2024 |
| Lxtrix Solutions Limited | Construction | 2016 |
| Lydia Mansi Ltd | Professional & scientific | 2024 |
| Lyle & James Company Ltd | Hospitality | 2018 |
| Lyleacre Property Limited | Real estate | 2021 |
| Lyme Bay Bifolds Ltd | Construction | 2019 |
| Lyme Bay Kitchen Limited | Hospitality | 2013 |
| Lympstone Estates Ltd | Real estate | 2017 |
| Lynden Place Management Company Ltd | Households | 2024 |
| Lyneham Inn Ltd | Hospitality | 2025 |
| Lynsey Young - Just Saying Ltd | Information & communication | 2013 |
| Lynx Astro Limited | Manufacturing | 2025 |
| Lynx Property (SW) Limited | Real estate | 2014 |
| Lynxor Global Limited | Professional & scientific | 2019 |
| Lyre Ltd | Arts & recreation | 2023 |
| Lzml (SW) Ltd | Real estate | 2023 |
| M & F Ukbd Ltd | Hospitality | 2022 |
| M & L Dogs Life Ltd | Financial services | 2020 |
| M & M Tyres and Batteries Limited | Wholesale & retail | 2002 |