| Last Maps Limited | Arts & recreation | 2018 |
| Last Minute Traffic Management Ltd | Transport & logistics | 2025 |
| LAT Investments Limited | Real estate | 2022 |
| Laughter Connects Ltd | Administrative & support | 2025 |
| Laundry FOX Limited | Other services | 2020 |
| Laura Grassulini Ltd | Professional & scientific | 2022 |
| Laurence Blake Ltd | Real estate | 2024 |
| Laurence Hall Ltd | Information & communication | 2014 |
| Lavant Garage Ltd | Administrative & support | 2017 |
| Lavender House Services Ltd. | Professional & scientific | 2019 |
| Lavine Web and AI Solutions Ltd | Information & communication | 2025 |
| Lavtech Limited | Construction | 2023 |
| Lawson Groundworks Ltd | Construction | 2023 |
| Layer 3 IT Solutions Limited | Information & communication | 2021 |
| Layla James Limited | Real estate | 2021 |
| Lazlina Services Limited | Construction | 2019 |
| LB Carpentry and Building Services Ltd | Construction | 2023 |
| LB Electrical Contracting Limited | Construction | 2025 |
| LBC Brickwork Limited | Construction | 2014 |
| LC 9 Limited | Professional & scientific | 2023 |
| LC Investigation Limited | Professional & scientific | 2020 |
| LCB Consultants Limited | Administrative & support | 2019 |
| LCD Interiors Ltd | Construction | 2023 |
| Lcfs CNC Ltd | Manufacturing | 2024 |
| Lcvt Limited | Manufacturing | 2016 |
| LDJ Fire and Security Ltd | Administrative & support | 2017 |
| Ldsma Developments Limited | Real estate | 2025 |
| Lead Tax Consultants Ltd | Professional & scientific | 2024 |
| Leadgen Hub Limited | Energy | 2025 |
| Leadgenexperts Ltd | Wholesale & retail | 2024 |
| Leadvine Ltd | Professional & scientific | 2018 |
| Leafy Homes Limited | Construction | 2004 |
| Lean Business Thinking Limited | Professional & scientific | 2013 |
| Lean Ginger Ltd | Wholesale & retail | 2025 |
| Lean Into Nature Limited | Education | 2024 |
| Learning With Nicole Ltd | Education | 2024 |
| Ledgers Accounting Limited | Professional & scientific | 2015 |
| LEE and LEE Holding Limited | Administrative & support | 2024 |
| LEE Brown Limited | Construction | 2002 |
| LEE Phillips Landscapes & Building Ltd | Construction | 2025 |
| LEE VFX Limited | Professional & scientific | 2017 |
| LEE White Flooring Services Limited | Construction | 2019 |
| Lee-On-The-Solent Coffee Company Ltd | Hospitality | 2021 |
| Leens Property Ltd | Real estate | 2026 |
| Leer Ltd | Hospitality | 2024 |
| Legacy Air Conditioning Installations Limited | Energy | 2025 |
| Legacy Air Conditioning Services Limited | Energy | 2023 |
| Legend Kitchen Services Limited | Construction | 2017 |
| Leigh Mcgovern Marketing Limited | Professional & scientific | 2005 |
| Lemac Autos Ltd | Manufacturing | 2013 |
| Lemon Belly Ltd | Wholesale & retail | 2021 |
| Lemon Street Dreams Ltd | Education | 2019 |
| Lena Defence Limited | Manufacturing | 2024 |
| Lena Group Limited | Financial services | 2024 |
| Lena Space Limited | Manufacturing | 2016 |
| Lenrose Wealth Management Ltd | Financial services | 2019 |
| Leonardo Smart Home Makers Limited | Manufacturing | 2020 |
| Lettwell Properties Ltd | Real estate | 2025 |
| Level Metrics Limited | Professional & scientific | 2020 |
| Level Scape Ltd | Construction | 2026 |
| Leverworks Ltd | Professional & scientific | 2020 |
| Levy Medical Services Limited | Health & social care | 2019 |
| Lewis Chaffey SEO Ltd | Professional & scientific | 2021 |
| Lexium IT Limited | Information & communication | 2023 |
| LF Tree Care Ltd | Agriculture & fishing | 2025 |
| LG Homes (Hants) Ltd | Real estate | 2024 |
| LG Security Services Limited | Administrative & support | 2025 |
| LH Windows Limited | Construction | 2013 |
| LHX Limited | Real estate | 2026 |
| Liberty Butler Management Limited | Professional & scientific | 2024 |
| Liberty Markets Ltd | Wholesale & retail | 2025 |
| Libyan Express Ltd | Information & communication | 2020 |
| Liddiard Earthworks Ltd | Construction | 2020 |
| Liddiard Holdings 2014 Limited | Financial services | 2014 |
| Lifeline Training Limited | Education | 2025 |
| Lifting & Scaffolding Services Limited | Construction | 2014 |
| Light Assembly Church | Other services | 2017 |
| Light House PM Ltd | Hospitality | 2024 |
| Lightning Fire Safety Systems Ltd | Construction | 2008 |
| Lightning Fire Safety Systems Trustees Limited | Professional & scientific | 2024 |
| Lightning Guitars Ltd | Wholesale & retail | 2024 |
| Lightwork Learning Limited | Manufacturing | 2025 |
| Lilly Charles Properties Ltd | Real estate | 2025 |
| Lilly Rose Creations Ltd | Wholesale & retail | 2021 |
| Limitlessu Ltd | Information & communication | 2025 |
| Limpieza Ltd | Wholesale & retail | 2025 |
| Lincoln and Lonsdale Ltd | Information & communication | 2025 |
| Lincox Ltd | Financial services | 2015 |
| Lingo Solutions Ltd | Information & communication | 2013 |
| Lingolandias Language School Limited | Education | 2024 |
| Link REC2REC Solutions Limited | Administrative & support | 2025 |
| Link Workspace Services Ltd | Real estate | 2020 |
| Lion Rail Ltd | Construction | 2018 |
| Liondell Limited | Professional & scientific | 2016 |
| Lionheart Football Club C.I.C. | Arts & recreation | 2024 |
| Lionheart Football Group Ltd | Arts & recreation | 2019 |
| Lipo Liscious Limited | Real estate | 2013 |
| Liquid Lantern Ltd | Information & communication | 2019 |
| Liquidambar Advisory Ltd | Professional & scientific | 2024 |
| Lisa Clayton Consulting Ltd | Professional & scientific | 2017 |