| Luc-Sol Limited | Transport & logistics | 2024 |
| Luca Carpentry Limited | Construction | 2010 |
| Luca Delivery Ltd | Transport & logistics | 2016 |
| Luca Lettings Ltd | Real estate | 2020 |
| Lucamae Developments Limited | Real estate | 2022 |
| Lucaroman Ltd | Manufacturing | 2021 |
| Lucas Ceconi Limited | Health & social care | 2013 |
| Lucas Gardening Ltd | Construction | 2021 |
| Lucas Green Management Company Limited | Households | 2021 |
| Lucas Rubbish Removal Ltd | Water & waste | 2022 |
| Lucid EYE Publications Ltd | Manufacturing | 2025 |
| Lucidity Limited | Information & communication | 1993 |
| Luckie Beans Ltd | Hospitality | 2014 |
| Lucknow Investments Limited | Real estate | 2009 |
| Lucknow Road Lodge Management Co. Limited | Real estate | 2002 |
| Lucky 33 Limited | Wholesale & retail | 2017 |
| Lucky Home Improvement Ltd | Construction | 2020 |
| Lucky Little Ltd | Wholesale & retail | 2023 |
| Lucky's Holding Ltd | Financial services | 2023 |
| Lucky's Properties Limited | Real estate | 2024 |
| Luckystar Innovation Limited | Health & social care | 2025 |
| Lucy Bell Managed Services Limited | Real estate | 2019 |
| Lucy Cooke Mortgage Broker Limited | Financial services | 2024 |
| Lucy Elizabeth Ltd | Professional & scientific | 2022 |
| Lucy Gossage Limited | Professional & scientific | 2020 |
| Lucy Loveheart Creations Ltd | Wholesale & retail | 2014 |
| Lucy's Creations Ltd | Professional & scientific | 2026 |
| Lucybullet Limited | Health & social care | 2019 |
| Luden Collective Ltd | Information & communication | 2025 |
| Ludlow Hill MOT Centre Limited | Wholesale & retail | 2015 |
| Ludlow Trade Sales Ltd | Wholesale & retail | 2025 |
| Ludlow’S Bespoke Ltd | Manufacturing | 2024 |
| Ludorati UK Limited | Wholesale & retail | 2017 |
| Lufinity Ltd | Health & social care | 2025 |
| Luftstrom CC Limited | Wholesale & retail | 2016 |
| Lufutk Limited | Health & social care | 2026 |
| Lugere Ltd | Information & communication | 2025 |
| Luisa Homes Ltd | Real estate | 2026 |
| Luka Aviation Limited | Manufacturing | 2020 |
| Lukas Ltd | Transport & logistics | 2017 |
| Luke & Bridger Law Ltd | Professional & scientific | 2021 |
| Luke Burrows Electrical Limited | Construction | 2018 |
| Luke Gardening Ltd | Administrative & support | 2024 |
| Luke Selby Ltd | Hospitality | 2025 |
| Lukegroup Consultancy Limited | Professional & scientific | 2023 |
| Lukegroup Ltd | Real estate | 2019 |
| Luktug Ltd | Professional & scientific | 2023 |
| Lula Design Ltd | Manufacturing | 2021 |
| Lula Interior Design Consultants Limited | Professional & scientific | 2020 |
| Lulu Garage Ltd | Manufacturing | 2026 |
| Lumah Property Solution Ltd | Real estate | 2023 |
| Lumax Civil & Environmental Ltd. | Professional & scientific | 2015 |
| Lume Studio Ltd | Information & communication | 2018 |
| Lumelec Limited | Construction | 1977 |
| Lumen Management Services Ltd | Professional & scientific | 2011 |
| Lumenloop Ltd | Manufacturing | 2024 |
| Lumeo Learning Ltd | Information & communication | 2026 |
| Lumera Healthcare Ltd | Professional & scientific | 2026 |
| Lumi Spa 8 Ltd | Other services | 2026 |
| Lumiere Leeds Limited Partnership | | 2005 |
| Lumik Healthcare Ltd | Health & social care | 2019 |
| Lumiks Ltd | Real estate | 2022 |
| Luminaedge Ltd | Other services | 2025 |
| Luminar Mortgages Ltd | Financial services | 2025 |
| Luminar Paraplanning Limited | Financial services | 2024 |
| Luminary Spark Ltd | Health & social care | 2025 |
| Luminary Strategies Limited | Professional & scientific | 2025 |
| Luminex Construction Ltd | Construction | 2024 |
| Luminis&Co Limited | Wholesale & retail | 2025 |
| Luminita Taxi Limited | Transport & logistics | 2019 |
| Luminos PR Limited | Professional & scientific | 2022 |
| Luminous Enterprises Limited | Professional & scientific | 2018 |
| Luminous Homes Limited | Real estate | 2021 |
| LUMLEY1 Estates Ltd | Real estate | 2022 |
| Lumoo Limited | Wholesale & retail | 2011 |
| Lumoo Properties Ltd | Real estate | 2021 |
| Lumori Group Ltd | Financial services | 2026 |
| Lumos Property Holdings Limited | Real estate | 2025 |
| Lumé Skin & Body Ltd | Other services | 2025 |
| Luna Adeona Limited | Transport & logistics | 2020 |
| Luna Blinds Limited | Manufacturing | 2019 |
| Luna Electrical Installations Ltd | Construction | 2015 |
| Luna Garden Rooms Limited | Construction | 2023 |
| Luna Madden Limited | Wholesale & retail | 2019 |
| Luna Moon Engineering Ltd | Information & communication | 2012 |
| Luna Property Partners Limited | Real estate | 2019 |
| Luna RAE Electrical Ltd | Construction | 2025 |
| Luna Rossi Ltd | Manufacturing | 2021 |
| Luna Supply Chain Solutions Limited | Professional & scientific | 2007 |
| Lunar Property Development Ltd | Construction | 2020 |
| Lunara Ltd | Real estate | 2020 |
| Lunarus Limited | Administrative & support | 2011 |
| Lunat Limited | Real estate | 2025 |
| Lungfish Architects Limited | Professional & scientific | 2015 |
| Lunn Construction & Development Limited | Construction | 2021 |
| Lunn Engineering Co.Limited | Manufacturing | 1952 |
| Lunna Properties Ltd | Real estate | 2026 |
| Lunox Ltd | Extraterritorial | 2022 |
| Lupani Ltd | Real estate | 2022 |
| Lupeta Estates Limited | Real estate | 1961 |