| Lumiskinglow Ltd | Wholesale & retail | 2026 |
| Lumosa UK Ltd | Manufacturing | 2020 |
| Lumumba Limited | Transport & logistics | 2025 |
| Luna Group Limited | Construction | 2017 |
| Luna Moon Events Ltd | Hospitality | 2025 |
| Luna NC Limited | Wholesale & retail | 2022 |
| Luna Professional Services Ltd | Administrative & support | 2024 |
| Luna Real State Ltd | Real estate | 2024 |
| Lunar Animation Ltd | Information & communication | 2014 |
| Lunar Coffee Company Ltd | Hospitality | 2019 |
| Lunar Collective Ltd | Real estate | 2017 |
| Lunar Lander Films Limited | Information & communication | 2013 |
| Lunch 'N Brunch Ltd | Hospitality | 2022 |
| Luncheon Express Limited | Hospitality | 2003 |
| Lung Fung Chinese Takeaway Ltd | Hospitality | 2014 |
| Lung Theatre Ltd. | Arts & recreation | 2016 |
| Lupeen Ltd | Manufacturing | 2025 |
| Lupfaw 447 Limited | Extraterritorial | 2017 |
| Lurana Holding Limited | Extraterritorial | 2019 |
| Lush Bathrooms Limited | Wholesale & retail | 2014 |
| Lush Tastes Catering Ltd | Manufacturing | 2024 |
| Lushi Ltd | Other services | 2010 |
| Lushous Clinic Ltd | Other services | 2023 |
| Lusof Ltd | Real estate | 2024 |
| Lusso Management Ltd | Real estate | 2018 |
| Lustre Gemmology Limited | Manufacturing | 2018 |
| Lustre Hair & Tanning Ltd | Other services | 2026 |
| Lusy Ltd | Health & social care | 2025 |
| Luthier Wood Limited | Wholesale & retail | 2025 |
| Lutra Marine Limited | Professional & scientific | 2014 |
| Luuma Ltd | Information & communication | 2025 |
| Luvdoner Limited | Hospitality | 2025 |
| Luvtus Ltd | Information & communication | 2026 |
| LUX Creations Ltd | Extraterritorial | 2023 |
| LUX Fragrances Limited | Wholesale & retail | 2025 |
| LUX Laser & Beauty Clinic Limited | Other services | 2020 |
| LUX WIZ Wands Ltd | Wholesale & retail | 2025 |
| LUX4MUD Ltd | Wholesale & retail | 2023 |
| Luxapink Ltd | Other services | 2019 |
| Luxe Air Studios Limited | Hospitality | 2024 |
| Luxe Direct Holdings Ltd | Wholesale & retail | 2026 |
| Luxe Dog Limited | Wholesale & retail | 2025 |
| Luxe Estates Ltd | Real estate | 2023 |
| Luxe Events and Parties Ltd | Administrative & support | 2022 |
| Luxe Land and Developments Ltd | Real estate | 2023 |
| Luxe Living Rentals Ltd | Real estate | 2024 |
| Luxe Residences Ltd | Real estate | 2025 |
| Luxedrive Solutions Ltd | Extraterritorial | 2024 |
| Luxenites Ltd | Real estate | 2024 |
| Luxeskin Training Academy Ltd | Other services | 2026 |
| Luxestar Limited | Other services | 2022 |
| Luxesuitesstays Ltd | Hospitality | 2025 |
| Luxetrendz Ltd | Wholesale & retail | 2025 |
| Luxhen Holdings Ltd | Financial services | 2025 |
| Luxite AI Solutions Ltd | Information & communication | 2025 |
| Luxlondon.Shop Ltd | Wholesale & retail | 2023 |
| Luxora Draws Ltd | Wholesale & retail | 2026 |
| Luxora Tours Limited | Administrative & support | 2025 |
| Luxury 61 Ltd | Wholesale & retail | 2025 |
| Luxury Barber Ltd | Other services | 2023 |
| Luxury Chartering Ltd | Wholesale & retail | 2025 |
| Luxury Chauffeur Services Ltd | Transport & logistics | 2024 |
| Luxury Diners Ltd | Hospitality | 2025 |
| Luxury Flooring Supplies Ltd | Wholesale & retail | 2021 |
| Luxury Home Decoration Ltd | Construction | 2025 |
| Luxury Nails Spa Ltd | Other services | 2023 |
| LV Fire Compliance Ltd | Professional & scientific | 2025 |
| LV Home Improvements Ltd | Construction | 2020 |
| LV Project Management Ltd | Administrative & support | 2015 |
| LVE Group Limited | Information & communication | 2023 |
| LVR Holdings Ltd | Financial services | 2022 |
| LW Cladding Limited | Construction | 2014 |
| LW Logistics Ltd | Administrative & support | 2017 |
| LWA Services Ltd | Other services | 2019 |
| Lwanga Company Limited | Health & social care | 2022 |
| LWK Music Limited | Information & communication | 2019 |
| LWL Automotive Ltd | Wholesale & retail | 2023 |
| Lxng RVN Limited | Information & communication | 2019 |
| Lxry Cars Ltd | Wholesale & retail | 2023 |
| LY (SY) Enterprises Ltd | Administrative & support | 2019 |
| Lydgate Green Apartments Management Company Limited | Households | 2025 |
| Lydgate Lane Management Limited | Households | 2006 |
| Lydgate Properties Limited | Other services | 1992 |
| Lydia Monks Ltd | Arts & recreation | 2014 |
| Lydia Whitmore Photography Limited | Professional & scientific | 2014 |
| Lydney Holding Limited | Financial services | 2023 |
| Lyfestays Ltd | Real estate | 2023 |
| LYL Evergreen Limited | Wholesale & retail | 2025 |
| Lymf Ltd | Health & social care | 2026 |
| Lyndhurst Gardens MC Limited | Households | 2018 |
| Lyndhurst Investments (SY) Ltd | Administrative & support | 2024 |
| Lyndon Edwards Ltd | Construction | 2017 |
| Lyndsay Elson Limited | Administrative & support | 2025 |
| Lynkd Ltd | Information & communication | 2026 |
| Lynne Goodhand Serendipity Education Ltd | Education | 2021 |
| Lynsey Pryor Independent Estate Agent Ltd | Real estate | 2022 |
| Lynthorpe Ltd | Construction | 2013 |
| Lynx Building Services Ltd | Construction | 2022 |
| Lynx Employment Services Ltd | Administrative & support | 2002 |
| Lynx Support Services Ltd | Health & social care | 2011 |