| Loveridge & Sons Roofing Ltd | Construction | 2024 |
| Lovey Construction Ltd | Construction | 2024 |
| Loving Hands Ltd | Health & social care | 2024 |
| LOW Price Accountants Ltd | Professional & scientific | 2019 |
| Lowclose Limited | Professional & scientific | 2000 |
| Loyal Factory Ltd | Other services | 2024 |
| Loyx Ltd | Information & communication | 2025 |
| Lozza Automotive Ltd | Wholesale & retail | 2024 |
| LPN Global Ltd | Administrative & support | 2023 |
| LR Media and E-Commerce Ltd | Wholesale & retail | 2025 |
| LRC Products Limited | Manufacturing | 1961 |
| LRC Secretarial Services Limited | Professional & scientific | 1963 |
| Lrmr Production Ltd | Manufacturing | 2021 |
| LRY Strategy Solutions Ltd | Professional & scientific | 2024 |
| LS Atwall Build Limited | Construction | 2026 |
| LS First Ltd | Hospitality | 2023 |
| LS GAS Limited | Administrative & support | 2017 |
| LS Javanda Constructions Ltd | Construction | 2024 |
| LS Solid Homes Ltd | Construction | 2025 |
| LSBC3MCFAR International Ltd | Financial services | 2025 |
| Lskphoto Ltd | Administrative & support | 2015 |
| LSM Carpentry & Joinery Limited | Manufacturing | 2021 |
| LT Smart Ltd | Information & communication | 2014 |
| LT Smart Technology Ltd | Professional & scientific | 2019 |
| Luca Shine Builders Ltd | Construction | 2019 |
| Lucatel Investments Ltd | Financial services | 2023 |
| Lucky Cart Ecomm Limited | Wholesale & retail | 2024 |
| Lucky Glazing 4 U Ltd | Construction | 2025 |
| Lucky Gloves School of Boxing and Holistic Educational Support Network CIC | Arts & recreation | 2022 |
| Lucky Shot Entertainment Ltd | Arts & recreation | 2025 |
| Lucky Solutions Limited | Professional & scientific | 2008 |
| LUCKYHOUSE67 Ltd | Real estate | 2025 |
| Lucn Private Limited | Health & social care | 2017 |
| Lucrum Maximum Limited | Professional & scientific | 2019 |
| Luczak Logistic Ltd | Transport & logistics | 2025 |
| Ludgate Square Limited | Real estate | 2017 |
| Ludhiana Express Ltd | Transport & logistics | 2026 |
| Luff Close Development Limited | Real estate | 2021 |
| LUG 'Oles Ltd | Information & communication | 2020 |
| Luigi Auto Care Tech Limited | Administrative & support | 2019 |
| Luigi New Auto Care Ltd | Wholesale & retail | 2023 |
| Lujan Coffee Shop Limited | Hospitality | 2020 |
| Lujan Sandwiches Limited | Hospitality | 2023 |
| LUK Wardrobe Ltd | Construction | 2019 |
| Luka Building Services Ltd | Construction | 2022 |
| Lukasa Ltd | Real estate | 2023 |
| Lukatec Ltd | Manufacturing | 2017 |
| Luke Taylor Design Ltd | Professional & scientific | 2025 |
| Luksha Limited | Information & communication | 2019 |
| Lulo Digital Media Ltd | Information & communication | 2026 |
| Lumea Global Ltd | Wholesale & retail | 2024 |
| Lumen Mansions Ltd | Real estate | 2020 |
| Lumen Vista Ltd | Professional & scientific | 2018 |
| Lumenloft Limited | Real estate | 2025 |
| Lumiere Noor Ltd | Wholesale & retail | 2026 |
| Lumina Bridge Ltd | Health & social care | 2026 |
| Lumindustries Limited | Households | 2022 |
| Lumineer Global Limited | Wholesale & retail | 2025 |
| Luminex Cleaning Limited | Administrative & support | 2026 |
| Luminousscents Ltd | Wholesale & retail | 2026 |
| Lumo Automotive Group Ltd | Wholesale & retail | 2026 |
| Lumora Commerce Ltd | Wholesale & retail | 2026 |
| Lumos Consultancy Ltd | Professional & scientific | 2022 |
| Luna Transport Ltd | Transport & logistics | 2025 |
| Lunaloft Ltd | Wholesale & retail | 2026 |
| Lunartek Ltd | Professional & scientific | 2019 |
| Lupin Healthcare (UK) Limited | Wholesale & retail | 2009 |
| Lush Hampers Ltd | Other services | 2018 |
| Lusophilia Ltd | Wholesale & retail | 2015 |
| Luton Zamzam Travels Ltd | Administrative & support | 2014 |
| LUV International Travel Limited | Administrative & support | 2026 |
| LUX Global Services Ltd | Professional & scientific | 2017 |
| LUX Tour Ltd | Hospitality | 2024 |
| Luxaris Group Ltd | Wholesale & retail | 2025 |
| Luxcroft Limited | Administrative & support | 2017 |
| Luxe Bedding Ltd | Wholesale & retail | 2025 |
| Luxe Marquees Ltd | Administrative & support | 2014 |
| Luxe Move Ltd | Real estate | 2026 |
| Luxe Nail Leven Ltd | Other services | 2021 |
| Luxe Only Ltd | Wholesale & retail | 2024 |
| Luxehub Ltd | Wholesale & retail | 2023 |
| Luxelane Store Limited | Wholesale & retail | 2025 |
| Luxinuk Limited | Hospitality | 2019 |
| Luxirides Auto Ltd | Wholesale & retail | 2026 |
| Luxmy & SON Ltd | Wholesale & retail | 2024 |
| Luxtrous Limited | Wholesale & retail | 2023 |
| Luxury Beauty Limited | Other services | 2024 |
| Luxury Homes Design and Build Ltd | Construction | 2024 |
| Luxury Houses Ltd | Real estate | 2023 |
| Luxury Lane Chauffeurs Ltd | Transport & logistics | 2025 |
| Luxxis Homes Limited | Construction | 2021 |
| Luxy Nails Limited | Other services | 2022 |
| LV Detailing Ltd | Wholesale & retail | 2022 |
| LV Nails & Beauty Ltd | Other services | 2026 |
| LVE Solutions Limited | Transport & logistics | 2024 |
| LVI CS Ltd | Information & communication | 2016 |
| LVN Solutions Limited | Information & communication | 2009 |
| Lvnv Property Management Limited | Real estate | 2021 |
| LVT Flooring UK Ltd | Construction | 2022 |
| LVW & Sons Limited | Construction | 2013 |