| Lupson Electronics Limited | Manufacturing | 2014 |
| Luro Electrical Solutions Ltd | Construction | 2012 |
| Lusayo Danniel Ltd | Professional & scientific | 2020 |
| Lusbeck Services (UK) Limited | Administrative & support | 2016 |
| Lush Creative Ltd | Professional & scientific | 2025 |
| Lusiadas Interactive Ltd | Information & communication | 2025 |
| Lusse Developments Limited | Construction | 2011 |
| Lutestar Simulation Ltd | Information & communication | 2002 |
| Luteus Limited | Extraterritorial | 1992 |
| Luti Barber Shop Limited | Other services | 2023 |
| Luton V.E. Limited | Other services | 1998 |
| Lutrette Limited | Information & communication | 2008 |
| Luume Limited | Manufacturing | 2020 |
| LUX & LAV Limited | Wholesale & retail | 2016 |
| LUX Couriers Ltd | Wholesale & retail | 2020 |
| LUX Labels Limited | Manufacturing | 2023 |
| LUX V P Services Limited | Administrative & support | 2025 |
| Luxbedco Ltd | Wholesale & retail | 2022 |
| Luxe Haus Living Ltd | Hospitality | 2023 |
| Luxe Instore Ltd | Administrative & support | 2024 |
| Luxe LAB Aesthetics Notts Ltd | Other services | 2026 |
| Luxe Living Management Ltd | Real estate | 2024 |
| Luxe Love Lettings Limited | Real estate | 2023 |
| Luxe Palace Ltd | Real estate | 2024 |
| Luxe Point Ltd | Real estate | 2025 |
| Luxe SO Clean Limited | Administrative & support | 2024 |
| Luxe Urbain Limited | Wholesale & retail | 2020 |
| Luxeclinic Systems Ltd | Information & communication | 2025 |
| Luxello Hospitality Ltd | Hospitality | 2023 |
| Luxeview Windows Ltd | Construction | 2025 |
| Luxivea Ltd | Wholesale & retail | 2020 |
| Luxline Cleaning Ltd | Administrative & support | 2026 |
| Luxon Group Limited | Administrative & support | 2018 |
| Luxon IP Company Limited | Extraterritorial | 2018 |
| Luxon Payments Holdings Limited | Administrative & support | 2018 |
| Luxon Payments Ltd | Information & communication | 2018 |
| Luxor Healthcare Limited | Health & social care | 2025 |
| Luxora Clean Limited | Administrative & support | 2026 |
| Luxoramart Ltd | Wholesale & retail | 2024 |
| Luxury Campervans UK Ltd | Wholesale & retail | 2025 |
| Luxury Car Finance Limited | Wholesale & retail | 2013 |
| Luxury Living Commercial Ltd | Manufacturing | 2020 |
| Luxury Living Company Online Limited | Wholesale & retail | 2021 |
| Luxury Movie Cars Ltd | Extraterritorial | 2023 |
| Luxury Nails&Beauty Ltd | Wholesale & retail | 2018 |
| Luxury Super Cars LLP | | 2023 |
| LUXURY2HOMES Ltd | Real estate | 2024 |
| Luxvision Construct Ltd | Construction | 2025 |
| Lu’S Notts Sauce Ltd | Wholesale & retail | 2021 |
| Lving Spaces Ltd | Real estate | 2019 |
| Lvpad Holdings Ltd | Real estate | 2026 |
| LVR Compliance Operations Ltd | Administrative & support | 2026 |
| LW 11 Limited | Administrative & support | 2008 |
| LW Arts CIC | Health & social care | 2021 |
| LW Mechanical Limited | Construction | 2025 |
| LWB Sales and Marketing Services Ltd | Wholesale & retail | 2019 |
| LWC Consulting Limited | Professional & scientific | 2015 |
| LWM Consulting Ltd | Administrative & support | 2026 |
| Lwrm Plumbing & Heating Limited | Construction | 2026 |
| LX Asset Holdings Ltd | Real estate | 2026 |
| Lycett Industries Limited | Manufacturing | 1981 |
| Lychgate Bespoke Build Limited | Construction | 2017 |
| Lychgate Developments Limited | Construction | 2025 |
| Lychgate Homes Limited | Construction | 1994 |
| Lychgate Packaging Limited | Administrative & support | 2003 |
| Lycourt Properties Limited | Real estate | 2002 |
| Lydia Posh Cleaners Ltd | Administrative & support | 2025 |
| Lydrol Studios Ltd | Professional & scientific | 2025 |
| Lyfcycle Ltd | Wholesale & retail | 2019 |
| Lyftas Ltd | Manufacturing | 2021 |
| Lyka Logistics Ltd | Transport & logistics | 2025 |
| Lyla Green Development Ltd | Real estate | 2024 |
| Lyla Green Properties Ltd | Real estate | 2024 |
| Lyla Homes Ltd | Real estate | 2022 |
| Lymac Consulting Limited | Professional & scientific | 2022 |
| Lyme Valley House Limited | Real estate | 2003 |
| Lymn Rose Holdings Limited | Financial services | 2022 |
| Lymn Rose Investments Limited | Other services | 2010 |
| Lynch Goldberg Ltd | Professional & scientific | 2017 |
| Lynchdriver 01 Limited | Transport & logistics | 2015 |
| Lyncroft Gardens Management Company Limited | Households | 1992 |
| Lyndon IT Consultancy Ltd | Information & communication | 2025 |
| Lynk-Uk Ltd | Administrative & support | 2025 |
| Lynn's Lets Limited | Real estate | 2017 |
| Lynton Fine Bone China Limited | Manufacturing | 2004 |
| Lynwood Country Park Limited | Real estate | 2021 |
| Lynwood Education Ltd | Education | 2025 |
| Lynwood Homes East Midlands Ltd | Construction | 2016 |
| Lyons Global Ltd | Health & social care | 2025 |
| Lyonsboston Limited | Arts & recreation | 2022 |
| Lyriq Healthcare Ltd | Administrative & support | 2019 |
| Lyriq Home Care Ltd | Health & social care | 2022 |
| LZ Group Ltd | Financial services | 2022 |
| LZG Limited | Hospitality | 2024 |
| Lzlc Ltd | Education | 2023 |
| LZP Ltd | Construction | 2022 |
| M & a Books Limited | Wholesale & retail | 2007 |
| M & a Day Farming Ltd | Agriculture & fishing | 2014 |
| M & a Refrigerations Ltd | Construction | 2025 |
| M & B Nails Ltd | Other services | 2026 |