| LPS - Landlord Property Services (UK) Limited | Other services | 2018 |
| LPS Roofing and Building Services Ltd | Construction | 2024 |
| LQM Jerome Limited | Administrative & support | 2022 |
| LR & CJ Limited | Professional & scientific | 2017 |
| LR Audio Limited | Administrative & support | 2026 |
| LR Clean Limited | Administrative & support | 2019 |
| LR Cleaning Limited | Administrative & support | 2022 |
| LR Holdings Group Ltd | Financial services | 2025 |
| LR Leisure Limited | Hospitality | 2025 |
| LR Nutrition Consultancy Limited | Education | 2023 |
| LR Podiatry Limited | Health & social care | 2021 |
| LR Rowbotham Ltd | Professional & scientific | 2022 |
| Lres Group Limited | Administrative & support | 2025 |
| Lres-Uk Ltd | Water & waste | 2012 |
| LRJ Services Limited | Real estate | 2015 |
| LRS Complaint Solutions Limited | Professional & scientific | 2014 |
| LRW Property Ltd | Real estate | 2021 |
| LS Cleaning Services Ltd | Administrative & support | 2017 |
| LS Educational and Child Psychology Ltd | Education | 2022 |
| LS Good Companions Ltd | Hospitality | 2023 |
| LS Health Ltd | Health & social care | 2024 |
| LS Hinch Limited | Professional & scientific | 2024 |
| LS Plumbing Supplies Ltd | Wholesale & retail | 2025 |
| LS Rose & Thistle Ltd | Hospitality | 2024 |
| LS Social Work Ltd | Health & social care | 2025 |
| LSA10 Holdings Ltd | Professional & scientific | 2025 |
| Lslcan Direct Ltd | Transport & logistics | 2019 |
| Lsls Trading Ltd | Manufacturing | 2023 |
| Lsmg Limited | Other services | 2024 |
| Lsrn Consultancy Ltd | Professional & scientific | 2012 |
| Lsson Ltd | Administrative & support | 2025 |
| LSY Limited | Real estate | 2012 |
| LT Employment Solutions Ltd | Administrative & support | 2023 |
| LT Interior Systems Ltd | Construction | 2018 |
| LT Marketing Solutions Limited | Professional & scientific | 2024 |
| LTA Online Limited | Wholesale & retail | 2017 |
| LTB Properties Limited | Real estate | 2021 |
| LTF Construction Systems Limited | Construction | 2021 |
| LTM Partners Limited | Administrative & support | 2025 |
| LTM Rigging Ltd | Mining & quarrying | 2014 |
| LTP Expanse Operations Limited | Professional & scientific | 2022 |
| LTW Events & Marketing Ltd | Professional & scientific | 2023 |
| LU Tong Limited | Wholesale & retail | 2025 |
| Lu-Ole Limited | Manufacturing | 2018 |
| Luca Estates Ltd | Real estate | 2026 |
| Luca Shutters Ltd | Construction | 2020 |
| Luca UK Properties Ltd | Real estate | 2026 |
| Lucarus Limited | Real estate | 2023 |
| Lucas Cable Services Ltd | Construction | 2018 |
| Lucas OIL Products Europe Ltd | Manufacturing | 2025 |
| Lucast Ltd | Wholesale & retail | 2020 |
| Lucena Ltd | Energy | 2018 |
| Lucent Advisory Limited | Professional & scientific | 2025 |
| Lucent Dynamics Limited | Manufacturing | 2002 |
| Lucent Solutions Limited | Professional & scientific | 2009 |
| Lucerne Villa Limited | Households | 2010 |
| Luciam Properties Ltd | Real estate | 2024 |
| Lucknow Court Flats Co. Limited | Households | 1979 |
| Lucky 60 Limited | Hospitality | 2025 |
| Lucky Brakes Ltd | Manufacturing | 2024 |
| Lucky Control Ltd | Arts & recreation | 2013 |
| Lucky Dallas Studio Limited | Arts & recreation | 2025 |
| Lucky L Ltd | Wholesale & retail | 2026 |
| Lucky Pallet Pulls Ltd | Wholesale & retail | 2026 |
| Lucky Turtle Ltd | Wholesale & retail | 2023 |
| Lucre Management Ltd | Administrative & support | 2020 |
| Lucy MAY Ltd | Wholesale & retail | 2014 |
| Lucy Pastorelli Distribution Limited | Wholesale & retail | 2022 |
| Lucy Pastorelli Nails and Training Ltd | Other services | 2014 |
| Lucy's Plaice Ltd | Hospitality | 2019 |
| Ludedat INV Ltd | Information & communication | 2025 |
| Ludlam Wills and Estate Planning Ltd | Professional & scientific | 2021 |
| Ludolf Consultancy Services Ltd | Information & communication | 2023 |
| Luft Product Design Ltd | Professional & scientific | 2023 |
| Lujo Ltd | Hospitality | 2021 |
| Lukasz & Dawid Properties SPV Ltd | Real estate | 2018 |
| Lukatah Ltd | Hospitality | 2024 |
| Luke Flint Building Services Limited | Construction | 2015 |
| Luke Interiors Limited | Construction | 2018 |
| Luke Lane Property Management Limited | Real estate | 2021 |
| Luke Metcalfe Ltd | Construction | 2019 |
| Luke Terry Limited | Transport & logistics | 2025 |
| Lukehorton Art Ltd | Wholesale & retail | 2021 |
| Lukenie Ltd | Wholesale & retail | 2026 |
| Lula's Luxury Homeware Ltd | Wholesale & retail | 2021 |
| Lulu Dresses Ltd | Wholesale & retail | 2021 |
| Luma Trading Limited | Wholesale & retail | 2025 |
| Lume Cosmetics Ltd | Other services | 2026 |
| Lumen Cleaning Ltd | Administrative & support | 2026 |
| Lumendeva Limited | Wholesale & retail | 2025 |
| Lumiere Futures Community Interest Company | Education | 2025 |
| Lumina Dental Hygiene Limited | Health & social care | 2024 |
| Lumina Health Imaging Ltd | Health & social care | 2025 |
| Lumina Research Ltd | Other services | 2022 |
| Luminesce Coaching Ltd | Education | 2022 |
| Lumini Progress Ltd | Hospitality | 2022 |
| Luminous Associates Limited | Wholesale & retail | 2018 |
| Luminous Deals Ltd | Wholesale & retail | 2025 |
| Luminous Solutions Limited | Professional & scientific | 2014 |
| Lumira by Joffy Ltd | Wholesale & retail | 2025 |