| Lester Cladding North West Limited | Construction | 2016 |
| Lesters Properties Ltd | Real estate | 2022 |
| Let's Discover Ltd. | Education | 2013 |
| Let's Shape OUR Creativity CIC | Arts & recreation | 2023 |
| Lets Avit Properties Ltd | Real estate | 2025 |
| Letsbuilditpro Limited | Construction | 2000 |
| Letting Rooms OVG Ltd | Real estate | 2023 |
| Letty Prime Properties Limited | Construction | 2025 |
| Level 3 Computers Limited | Wholesale & retail | 2022 |
| Level UP Building Services Ltd | Construction | 2023 |
| Levin Mart Limited | Wholesale & retail | 2025 |
| Lewis Creative Ltd | Other services | 2023 |
| Lewis Heating and Plumbing Limited | Construction | 2025 |
| Lexis Management Ltd | Real estate | 2023 |
| Leyem Transport Ltd | Transport & logistics | 2021 |
| Leyland Group Ltd | Transport & logistics | 2026 |
| LF Digital Accounting Ltd | Professional & scientific | 2024 |
| LF Social Media Management Ltd | Professional & scientific | 2025 |
| Lfcareservices Ltd | Health & social care | 2022 |
| Lfj&Co. Holdings Ltd | Manufacturing | 2024 |
| LFP Engineering Ltd | Professional & scientific | 2025 |
| LG Prosthetics Limited | Health & social care | 2016 |
| LGG Cosmetics Ltd | Wholesale & retail | 2023 |
| LH Designs and Displays Limited | Wholesale & retail | 2025 |
| LH Trading NW Limited | Wholesale & retail | 2023 |
| LHA Holding Limited | Real estate | 2023 |
| LHS Electrical Limited | Construction | 2023 |
| Liams Barber NO.1 Ltd | Other services | 2024 |
| Liangan Jiaren Ltd | Hospitality | 2019 |
| Liberty Accounting Services Limited | Professional & scientific | 2016 |
| Liberty Fortune Key Investments Limited | Professional & scientific | 2026 |
| Liberty Group Services Limited | Financial services | 2021 |
| Liberty Roofing (Burton) Limited | Construction | 2019 |
| Liberty Roofing (East Midlands) Limited | Construction | 2015 |
| Liberty Roofing (North Midlands) Limited | Construction | 2021 |
| Liberty Roofing (North West) Limited | Construction | 2015 |
| Liberty Roofing (Northampton) Limited | Construction | 2019 |
| Liberty Roofing (Oxford) Limited | Construction | 2019 |
| Liberty Roofing (Scotland) Ltd | Construction | 2024 |
| Liberty Roofing (West Midlands) Limited | Construction | 2015 |
| Liberty Roofing Cheshire Ltd | Construction | 2025 |
| Liberty Roofing Services Limited | Construction | 2001 |
| Liew Urology Ltd. | Health & social care | 2021 |
| Life Essenz Ltd | Professional & scientific | 2021 |
| Life Inspired Group Ltd | Wholesale & retail | 2024 |
| Life Marketing Solutions Ltd. | Professional & scientific | 2007 |
| Lifecare Partner Services Limited | Health & social care | 2025 |
| Lifecycle Project Services Limited | Professional & scientific | 2011 |
| Lifestyle DOC Ltd | Arts & recreation | 2024 |
| Lifter Limited | Professional & scientific | 2015 |
| Liftline UK Warehouse Solutions Limited | Manufacturing | 2026 |
| Liftsafe Compliance Ltd | Extraterritorial | 2025 |
| Lightingagent Ltd | Wholesale & retail | 2021 |
| Lignum Holdings Ltd | Real estate | 2022 |
| Liicomy Ltd | Wholesale & retail | 2026 |
| Lilac Lettings & Sales Limited | Real estate | 2014 |
| Lilac Lettings Limited | Extraterritorial | 2013 |
| Lilo Properties Limited | Real estate | 2026 |
| Lilo&Stitch Limited | Construction | 2025 |
| Limelite Design Limited | Manufacturing | 1991 |
| Limes Support Services Ltd | Other services | 2014 |
| Limitless Life Coaching Ltd | Professional & scientific | 2022 |
| Limuss Ltd | Professional & scientific | 2025 |
| Lincoln Joinery & Building Limited | Construction | 2002 |
| Linden House Property Investment Ltd | Real estate | 2019 |
| Lindomus | Professional & scientific | 2025 |
| Lindore Limited | Real estate | 2025 |
| Lindsey Brown Financial Services Ltd | Other services | 2017 |
| Linfoot Properties Limited | Real estate | 2002 |
| Linguastars Education Ltd | Education | 2022 |
| Link Compliance Limited | Extraterritorial | 2015 |
| Link Contracting Services Limited | Construction | 1990 |
| Linkin Transport & Logistics Ltd | Transport & logistics | 2016 |
| Linkit Recruitment Limited | Administrative & support | 2015 |
| Linkit Resource Partnership Limited | Administrative & support | 2020 |
| Linkway Electrical Ltd | Construction | 2024 |
| Linkwise Recruitment Ltd | Administrative & support | 2025 |
| Linsons Ltd | Administrative & support | 2018 |
| Linten Garden Products Limited | Wholesale & retail | 1982 |
| Linx Accounting Services Limited | Professional & scientific | 2018 |
| Linx Holdings Ltd | Professional & scientific | 2015 |
| Lion Park Limited | Real estate | 2003 |
| Lions DEN Fitness Centre Limited | Arts & recreation | 2011 |
| Lions Elite Organisation Limited | Financial services | 2026 |
| Liptrot Properties Limited | Real estate | 2023 |
| LIR I & R Ltd | Financial services | 2013 |
| Lisa Jane Aesthetics Standish Limited | Other services | 2025 |
| Lisant Engineering Limited | Professional & scientific | 2018 |
| Lisant Investments Limited | Real estate | 2020 |
| LIT Summits Limited | Professional & scientific | 2019 |
| Litigation Recovery Services Limited | Administrative & support | 2006 |
| Little Angel Clothing Ltd | Manufacturing | 2025 |
| Little Bears Standish Ltd | Education | 2022 |
| Little Bixx Ltd | Manufacturing | 2024 |
| Little CR Ackers Groups Ltd | Education | 2022 |
| Little Fifteen Ltd | Hospitality | 2009 |
| Little House of Vivid Ltd | Other services | 2017 |
| Little Lane Play Cafe Ltd | Hospitality | 2026 |
| Little Lives Animal Rescue CIC | Other services | 2026 |
| Little Treasures Boutique Ltd | Wholesale & retail | 2019 |