| LH Electrical and Maintenance Services Limited | Construction | 2023 |
| LH Star Properties Ltd | Real estate | 2016 |
| LHB Land Limited | Real estate | 2022 |
| Liagem Limited | Professional & scientific | 2006 |
| Liam Scaffolding Ltd | Construction | 2019 |
| Lianie Limited | Health & social care | 2018 |
| Libcarm Limited | Hospitality | 2010 |
| Libella Properties Ltd | Real estate | 2025 |
| Liberty Nails Spa Ltd | Other services | 2025 |
| Liberty Transport U.K. Limited | Transport & logistics | 2022 |
| Libu Lighting Ltd | Wholesale & retail | 2020 |
| Licc Properties Ltd | Construction | 2018 |
| Licciardi Property Investments Ltd | Real estate | 2023 |
| Licensed Tutors Ltd | Education | 2015 |
| Licensing Executives Society Limited | Other services | 1973 |
| Licyp Ltd | Construction | 2012 |
| Lida Cashews Limited | Wholesale & retail | 2025 |
| Liddle & Co Ltd | Construction | 2014 |
| Lido's Facilities Management Ltd | Construction | 2021 |
| Life After Sport Ltd | Administrative & support | 2016 |
| Life at Hill Farm Limited | Agriculture & fishing | 2014 |
| Life Haven Homes Limited | Health & social care | 2024 |
| Life Impact Limited | Health & social care | 2022 |
| Life IS Lifting Ltd | Manufacturing | 2016 |
| Life Science Services Limited | Construction | 2016 |
| Life&Way Ltd | Real estate | 2025 |
| Lifeline Ancillaries Limited | Professional & scientific | 2005 |
| Lifeline Companions Ltd | Administrative & support | 2024 |
| Lifeline Rescue Solutions Limited | Other services | 2024 |
| Lifeplus Fitness Limited | Arts & recreation | 2021 |
| Lifestyle Entrepreneur Limited | Education | 2022 |
| Liftpol Construction Ltd | Construction | 2025 |
| Light Air Construction Ltd | Construction | 2022 |
| Light Fantastic Productions Ltd | Education | 2018 |
| Light Sound Technical Services Limited | Administrative & support | 2003 |
| Light Star Tyres Ltd | Manufacturing | 2025 |
| Lightbulb Bespoke Care, Family Support & Consulting Services Ltd | Public administration | 2018 |
| Lighting in Motion Ltd | Wholesale & retail | 2016 |
| Likemind Studios Limited | Professional & scientific | 2023 |
| LIL Homes London Limited | Real estate | 2023 |
| LIL Pooch Ltd | Wholesale & retail | 2024 |
| Lilibeth Cousins Ltd | Health & social care | 2021 |
| Lill Consulting Ltd | Professional & scientific | 2015 |
| Lill Secure Ltd | Construction | 2015 |
| Lillian Gray Accountants Ltd | Professional & scientific | 2016 |
| Lillian Gray Holdings Ltd | Real estate | 2020 |
| Lillian Purge Ltd | Professional & scientific | 2024 |
| Lillibet Estates Limited | Professional & scientific | 2020 |
| Lillibet Healthcare Limited | Health & social care | 2016 |
| Lillibet HEALTHCARE2 Limited | Health & social care | 2020 |
| Lillibet House Ltd | Health & social care | 2023 |
| Liloom Home Care Limited | Health & social care | 2023 |
| Lily Lauren Limited | Real estate | 2018 |
| Lily PAD Group Limited | Health & social care | 2021 |
| Lime Community Services Ltd | Health & social care | 2025 |
| Lime Mews Management Company Limited | Households | 2009 |
| Lime Street Bedford Limited | Real estate | 2024 |
| Lime Street Buffet Limited | Hospitality | 2022 |
| Limitsnkrs Ltd | Wholesale & retail | 2024 |
| Linbert Spencer Consultancy Limited | Professional & scientific | 2002 |
| Lincoln Court Management Company Limited | Households | 1984 |
| Lincolnjack Ltd | Construction | 2018 |
| Lind Avenue Limited | Professional & scientific | 2019 |
| Linda Meeks Properties Limited | Real estate | 2010 |
| Linden Court Management Company Limited | Households | 1988 |
| Linden House Productions Limited | Information & communication | 2024 |
| Lindens Technical and Environmental Limited | Administrative & support | 2013 |
| Lindis Enterprises Limited | Real estate | 2003 |
| Lindleys Enterprises Limited | Wholesale & retail | 2008 |
| Lindsay Court Limited | Households | 2001 |
| Lindsay Ephgrave PR Ltd | Professional & scientific | 2011 |
| Lindstrom Limited | Other services | 2001 |
| Line of Sight Care Limited | Administrative & support | 2017 |
| Line of Sight Productions Limited | Information & communication | 2008 |
| Lines Projects Limited | Construction | 2025 |
| Lingdale Place Residents' Association Limited | Households | 1985 |
| Lingers High Class Butchers Limited | Wholesale & retail | 2012 |
| Lington Services Ltd | Information & communication | 2022 |
| Linguists Collective Ltd | Professional & scientific | 2020 |
| Link to Change | Health & social care | 2003 |
| Linkup Padel Limited | Administrative & support | 2025 |
| Linroy Ltd | Administrative & support | 2011 |
| Linton Vale Partners Limited | Information & communication | 2025 |
| Lion and Lamb Ltd | Transport & logistics | 2017 |
| Lion Empire Ltd | Wholesale & retail | 2026 |
| Lion Strategy Limited | Professional & scientific | 2017 |
| Lionel Etoo Computers Ltd | Wholesale & retail | 2025 |
| Lionfish Capital Ltd | Real estate | 2019 |
| Lionsgate Consulting Ltd | Professional & scientific | 2013 |
| Lionsgate Management Limited | Real estate | 2013 |
| Lionsgate Property Group Ltd | Real estate | 2024 |
| Lioreta&Hip Logistic Ltd | Transport & logistics | 2022 |
| Lipika and Prejeev Commercial Properties Ltd | Construction | 2024 |
| Lipika and Prejeev Properties Ltd | Real estate | 2024 |
| Lipp Studios Limited | Professional & scientific | 2025 |
| Lipscombe-Southwell Limited | Professional & scientific | 2015 |
| Lipstick Digital Ltd | Professional & scientific | 2025 |
| Liqorv Ltd | Wholesale & retail | 2025 |
| Liquid Films Limited | Information & communication | 2005 |
| Liquid Space Ltd | Manufacturing | 2020 |