| LM & R Limited | Information & communication | 2024 |
| LM Flude Ltd | Other services | 2026 |
| LMA Golf Ltd | Arts & recreation | 2021 |
| LMB Promotions Limited | Wholesale & retail | 2017 |
| Lmpackaging Ltd | Manufacturing | 2026 |
| LMS Cleaning Ltd | Administrative & support | 2022 |
| LMY Group Ltd | Wholesale & retail | 2026 |
| Lo's Pharmacy Limited | Wholesale & retail | 1998 |
| Load Logistics Ltd | Transport & logistics | 2024 |
| Loaded Eats Ltd | Hospitality | 2026 |
| Loadhauler (U.K.) Limited | Professional & scientific | 1973 |
| Loansearch UK Limited | Financial services | 2003 |
| Loca Construction Ltd | Construction | 2020 |
| Local Charcoal Limited | Agriculture & fishing | 2015 |
| Local Fixer Ltd | Professional & scientific | 2022 |
| Local Lettings Yorkshire Limited | Real estate | 2017 |
| Local.Travel Ltd | Administrative & support | 2026 |
| Lock Safe TM Ltd | Manufacturing | 2023 |
| Lockley & Ashmore Limited | Arts & recreation | 2014 |
| Logic Automotive Solutions Ltd | Wholesale & retail | 2022 |
| Logic Office Limited | Extraterritorial | 2012 |
| Logistics by Day Limited | Transport & logistics | 2021 |
| Logistics North MC Limited | Real estate | 2014 |
| Logix Auto Centre Ltd | Administrative & support | 2009 |
| Logix Auto-Centre (Parkgate) Limited | Wholesale & retail | 2016 |
| LOK Carpet Fitting Ltd | Construction | 2014 |
| Loklans Leisure Ltd | Hospitality | 2025 |
| Lolan Properties Ltd | Real estate | 2025 |
| Lomas Logistics Ltd | Transport & logistics | 2023 |
| Lombardi Property Group Ltd | Real estate | 2023 |
| London Connection Parties Ltd | Wholesale & retail | 2026 |
| London Intimates Ltd | Wholesale & retail | 2022 |
| Longacre Garden & Leisure Ltd | Professional & scientific | 2009 |
| Longman Cooling Solutions Ltd | Energy | 2025 |
| Longstaffs Consulting Ltd | Professional & scientific | 2020 |
| Looking After YOU Ltd | Wholesale & retail | 2008 |
| Loose Covers Yorkshire Ltd | Manufacturing | 2012 |
| Lora V Krasteva Ltd | Arts & recreation | 2021 |
| Lord and Downing Limited | Construction | 2002 |
| Lord Finance Services Ltd | Financial services | 2025 |
| Lord Timber Solutions Ltd | Manufacturing | 2022 |
| Loro Insurtech Ltd | Information & communication | 2025 |
| Lost Chord UK | Health & social care | 2003 |
| Lost Will Ltd | Wholesale & retail | 2023 |
| Lostock EFW Listco Limited | Financial services | 2018 |
| Lostock Power Limited | Energy | 2016 |
| Lostock Sustainable Energy Plant Ltd | Energy | 2015 |
| Lotus Investments Ltd | Construction | 2025 |
| Lotus Passive Fire Protection Ltd | Construction | 2020 |
| Louie Taylor Roof Repairs Ltd | Professional & scientific | 2024 |
| Louis Wilson Boats Limited | Manufacturing | 2018 |
| Lounge Limited | Hospitality | 2025 |
| Loura Bella Ltd | Other services | 2014 |
| Lourensford Consultancy Solutions Ltd | Professional & scientific | 2017 |
| Love Your Pet Limited | Wholesale & retail | 2020 |
| Love Your Plumber Limited | Construction | 2017 |
| Lovestruck Visuals Ltd | Professional & scientific | 2023 |
| Loving Arms Care Ltd | Health & social care | 2015 |
| Loxley GAS and Electrical Limited | Manufacturing | 2020 |
| Loxley Nursery Ltd | Education | 2026 |
| Loylo Limited | Hospitality | 2015 |
| LP Education Consultancy Ltd | Professional & scientific | 2024 |
| LP Plastering Limited | Construction | 2023 |
| LP88 Ltd | Transport & logistics | 2018 |
| LPC Estates Ltd | Real estate | 2026 |
| LPR Installations Group Ltd | Construction | 2017 |
| LPW Rail Training Limited | Education | 2025 |
| LRA Accountants Limited | Professional & scientific | 2024 |
| LRB Enterprises Limited | Administrative & support | 2018 |
| Lrmanz Solutions Limited | Professional & scientific | 2024 |
| LRT Lettings Ltd | Real estate | 2019 |
| LRW Telecom Limited | Construction | 2009 |
| LS Interior Systems Ltd | Construction | 2020 |
| LS Storage & Distribution Ltd | Transport & logistics | 2022 |
| LS1 Motors Ltd | Wholesale & retail | 2026 |
| LSA Money Limited | Financial services | 2025 |
| LSB Design Ltd | Professional & scientific | 2011 |
| LSG Setting OUT Limited | Construction | 2023 |
| Lsjc Training Ltd | Other services | 2025 |
| LSL Cladding Ltd | Construction | 2022 |
| LSL Paint Tech Ltd | Construction | 2026 |
| LSR Telecoms Limited | Extraterritorial | 2018 |
| LT Professional Services Limited | Professional & scientific | 2019 |
| LTE Plumbing & Heating Ltd | Construction | 2020 |
| LTJ Surfacing Limited | Construction | 2026 |
| Ltsolutions Limited | Extraterritorial | 2022 |
| Lucas HR Limited | Administrative & support | 2017 |
| Luckett Construction Limited | Construction | 2025 |
| Lucky Playz Ltd | Information & communication | 2019 |
| Luckylong Limited | Hospitality | 2026 |
| Lucr Marketing Limited | Wholesale & retail | 2026 |
| Lullaby Lane Baby Shop Ltd | Wholesale & retail | 2013 |
| Luma Skin Clinic Limited | Other services | 2025 |
| Lumana Ltd | Professional & scientific | 2025 |
| Lumavion Ltd | Wholesale & retail | 2026 |
| Lumia Electrical Limited | Construction | 2019 |
| Luminara on Limited | Information & communication | 2021 |
| Lumio Nails & Spa Ltd | Other services | 2025 |
| Lumlec Electrical Ltd | Construction | 2021 |
| Lumlec Group Ltd | Construction | 2021 |