| Littleburys Properties Ltd | Real estate | 2017 |
| Littlehampton Glass & Glazing Ltd | Wholesale & retail | 1999 |
| Littlehampton Scaffolding Ltd | Construction | 2014 |
| Littoralis Limited | Information & communication | 1999 |
| Livelink Aerospace Limited | Manufacturing | 2016 |
| Livelink Technology Ltd | Manufacturing | 2004 |
| Livily Properties Limited | Real estate | 2021 |
| LJ Wilmot Properties Ltd | Real estate | 2024 |
| LJE Grave Admin Ltd | Administrative & support | 2012 |
| LJF Associates Ltd | Health & social care | 2013 |
| LJM Autos Limited | Wholesale & retail | 2024 |
| LJO Audio Ltd | Information & communication | 2025 |
| LJT Arthro Services Limited | Health & social care | 2024 |
| Lkeogh QA Limited | Information & communication | 2017 |
| Ll&B Ltd | Professional & scientific | 2025 |
| Llcl Ltd | Real estate | 2023 |
| LLK LED Ltd | Construction | 2023 |
| Lloyd Road Limited | Real estate | 2025 |
| LM Cleaner Service Ltd | Administrative & support | 2021 |
| LM Squared Ltd | Professional & scientific | 2016 |
| LMD Property Holdings Limited | Financial services | 2026 |
| LME Outboard Services Ltd | Professional & scientific | 2016 |
| LMK Self Hire and Transport Ltd | Administrative & support | 2025 |
| LMS Computer Services Ltd | Information & communication | 2010 |
| LNB Electrical Limited | Construction | 2018 |
| Local Lead Force Ltd | Information & communication | 2026 |
| Lock'N'Load Film Props Ltd | Arts & recreation | 2015 |
| Lockbox Self Storage Ltd | Administrative & support | 2011 |
| Lockett Media Ltd | Manufacturing | 2022 |
| Lockngo Ltd | Information & communication | 2024 |
| Locks Mops Ltd | Administrative & support | 2024 |
| Lockside Limited | Construction | 1998 |
| Lodge Court Associates Limited | Administrative & support | 2015 |
| Loft Blinds Limited | Wholesale & retail | 2004 |
| Loft Centre Products Limited | Wholesale & retail | 2008 |
| Logan King Holdings Ltd | Financial services | 2023 |
| Loggins Ltd | Real estate | 2019 |
| Logistics & Lifting Limited | Construction | 2017 |
| Lola & Toff Ltd | Manufacturing | 2022 |
| Loma-Global Limited | Arts & recreation | 2025 |
| London and County Construction Limited | Construction | 1990 |
| London Ballistics Ltd | Professional & scientific | 2021 |
| London Bridge Aesthetics Ltd | Health & social care | 2025 |
| London Decorating Contractors Limited | Construction | 2017 |
| London Scaffolding Contractor Ltd | Construction | 2024 |
| London Scaffolding Supplies Ltd | Construction | 2022 |
| Long Furlong Lodges Ltd | Real estate | 2024 |
| Longitude Systems Engineering Limited | Administrative & support | 2011 |
| Longlime Limited | Hospitality | 1981 |
| Longman Medical Ltd | Health & social care | 2024 |
| Loom Link Wholesale Ltd | Wholesale & retail | 2025 |
| Loonery Limited | Financial services | 2012 |
| Loop Finance Ltd | Information & communication | 2025 |
| Loopi Media Ltd | Professional & scientific | 2021 |
| Looplings Ltd | Wholesale & retail | 2026 |
| Lord & Haskins Properties Ltd | Real estate | 2025 |
| Lord Loudly Limited | Wholesale & retail | 2000 |
| Lordington Events Ltd | Arts & recreation | 2025 |
| Lordship Limited | Professional & scientific | 1989 |
| Lorna Smith Interiors Ltd | Wholesale & retail | 2008 |
| Lotties Building Services Ltd | Construction | 2020 |
| Lotus Talent Solutions Ltd | Administrative & support | 2024 |
| LOU Doye Presents Ltd | Information & communication | 2018 |
| Louise Turner Legal Services Limited | Professional & scientific | 2023 |
| Love Mother Earth Handmade Organics Ltd | Manufacturing | 2022 |
| Lovelace Lodge Company Limited | Households | 2007 |
| Lovell's Drawing Office Ltd | Professional & scientific | 2021 |
| LOW Box Events Ltd | Administrative & support | 2025 |
| Lowe Contractors Ltd | Construction | 2024 |
| Lowenna Harlow Ltd | Health & social care | 2022 |
| Lowood Logistics Limited | Extraterritorial | 2019 |
| Loxley Gardens Limited | Households | 1993 |
| Lpholdingmanagement Limited | Hospitality | 2023 |
| LPO Southern Ltd | Real estate | 2020 |
| LPO Southern Trading Ltd | Real estate | 2024 |
| LRD Management Ltd | Administrative & support | 2025 |
| LRG Photography Limited | Professional & scientific | 2013 |
| Lrms Property Limited | Households | 2025 |
| LRP International Ltd | Wholesale & retail | 2021 |
| LRW Civil Designs Ltd | Professional & scientific | 2013 |
| Lsquared Property Limited | Construction | 2015 |
| Lsquared Property Two Limited | Real estate | 2022 |
| LT & LM Limited | Real estate | 2024 |
| Ltds Marsh Ltd | Administrative & support | 2014 |
| LUC Capital Limited | Financial services | 2014 |
| Lucashousestudios Ltd | Information & communication | 2022 |
| Luck Group Ltd | Information & communication | 2024 |
| Luckes Ltd | Hospitality | 2016 |
| Lucksfield Building Services Limited | Construction | 2009 |
| Lucky Beach Ltd | Hospitality | 2012 |
| Lucky Bean Ltd | Hospitality | 2015 |
| Lucy Bradshaw Jewellery Limited | Wholesale & retail | 2016 |
| Luke Norton Estates Limited | Real estate | 2026 |
| Lula Weddings Ltd | Arts & recreation | 2025 |
| Lumdum Limited | Hospitality | 2017 |
| Lunchbox Food Services Ltd | Hospitality | 2024 |
| Lunna Ltd | Wholesale & retail | 2018 |
| Lutano Ltd | Information & communication | 2022 |
| LUX Orbis Limited | Construction | 2014 |
| Luxe GEL Ltd | Wholesale & retail | 2023 |