| Leiston Online Ltd | Manufacturing | 2019 |
| Leisure Craft Coatings Limited | Manufacturing | 2008 |
| Leisure Displays Ltd | Professional & scientific | 2007 |
| Leisure Union Insurance (Management) Company Limited | Financial services | 2003 |
| Lemina Beauty Ltd | Other services | 2026 |
| Lemon & Lime Properties Ltd | Real estate | 2025 |
| Lemon Dragon Tattoo Ltd | Arts & recreation | 2014 |
| Lemonaid Consulting Ltd | Professional & scientific | 2025 |
| Lendese Limited | Financial services | 2015 |
| Lennon Haulage Limited | Transport & logistics | 2018 |
| Lennox DRY Clean Ltd | Other services | 2024 |
| Leon Chevalier Racing Ltd | Arts & recreation | 2023 |
| Leona Property Management Limited | Real estate | 2026 |
| Leonards Court (Ipswich) Limited | Real estate | 1978 |
| Leonrise AM Limited | Construction | 2024 |
| Leopard Accounting Services Limited | Professional & scientific | 2011 |
| LES Floofies Ltd | Financial services | 2023 |
| LES Toits a LA Hauteur Ltd | Construction | 2026 |
| Leslie Blake Limited | Transport & logistics | 2023 |
| Leslie James Ltd | Wholesale & retail | 2016 |
| Leslie Paul Emmerson Limited | Extraterritorial | 2025 |
| Lester (UK) Limited | Construction | 2005 |
| Let's BE More Limited | Professional & scientific | 2018 |
| Let's Talk About Ltd | Professional & scientific | 2024 |
| Letang Property Investments Ltd | Real estate | 2025 |
| Lets Dwell Ltd | Real estate | 2023 |
| Letter for Letter Theatre Ltd | Arts & recreation | 2022 |
| Letts Swim Limited | Arts & recreation | 2020 |
| Letts Swimming Pools Limited | Construction | 1979 |
| Level 3 Services Ltd | Information & communication | 2021 |
| Level Two Beards Limited | Information & communication | 2019 |
| Lever FAR East (UK) Limited | Other services | 2004 |
| Leverage Production Group Ltd | Information & communication | 2025 |
| Levington Carpentry & Joinery Ltd | Construction | 2013 |
| LEW Worx Ltd | Wholesale & retail | 2025 |
| Lewbry Properties Limited | Construction | 2016 |
| Lewis & Brooks Ltd | Professional & scientific | 2024 |
| Lewis Allison Construction and Landscapes Ltd | Administrative & support | 2026 |
| Lewis Close Management Co. Ltd | Real estate | 2018 |
| Lewis Grey Ltd | Construction | 2018 |
| Lewis Hair Team Ltd | Wholesale & retail | 2012 |
| Lewis Haulage Solutions Limited | Transport & logistics | 2020 |
| Lewis Improvements Limited | Construction | 2014 |
| Lewis Johnson Carpentry Ltd | Construction | 2010 |
| Lewis Radio Ltd | Administrative & support | 2026 |
| Lewis Roberts and Associates Limited | Professional & scientific | 2019 |
| Lexa Transport Ltd | Wholesale & retail | 2020 |
| Lexden Computer Services Limited | Extraterritorial | 1996 |
| Lexia Media Limited | Professional & scientific | 2005 |
| Lexikon Ltd | Construction | 2024 |
| Lexmark Trading Limited | Wholesale & retail | 2016 |
| Lexnode Consultants Ltd | Information & communication | 2025 |
| Lexorra Ltd | Administrative & support | 2025 |
| Lexus Container Line (UK) Ltd | Transport & logistics | 2018 |
| Leyton Logistics Limited | Transport & logistics | 2018 |
| LF 54 17 Limited | Financial services | 2025 |
| LGB Landscape Ltd | Administrative & support | 2019 |
| LGN Investment's Ltd | Financial services | 2025 |
| LGR & Sons Ltd | Manufacturing | 2025 |
| LGR Hire and Repair Limited | Manufacturing | 2016 |
| LGR Plant Repairs Ltd | Manufacturing | 2020 |
| LGR Utility Repairs Ltd | Manufacturing | 2025 |
| LH Suffolk Ltd | Wholesale & retail | 2025 |
| LH7 Stays Limited | Real estate | 2024 |
| LHK Venturs Limited | Hospitality | 2024 |
| LHS Rentals Ltd | Real estate | 2021 |
| LHW Property Development Ltd | Construction | 2021 |
| LHZ First Ltd | Real estate | 2024 |
| LIA Transport Ltd | Transport & logistics | 2020 |
| Liability & General Management Consultants Ltd | Financial services | 2014 |
| Liability & General Risk Management Limited | Professional & scientific | 2024 |
| Liaison Produced Limited | Information & communication | 2016 |
| Liam Molloy Transport Limited | Transport & logistics | 2006 |
| Liam Sanford Limited | Arts & recreation | 2019 |
| Lianke Trade Limited | Wholesale & retail | 2026 |
| Liber Europe Ltd | Wholesale & retail | 2019 |
| Libertas Development Limited | Real estate | 2024 |
| Libertas Property Group Limited | Real estate | 2024 |
| Liberty First Consulting Limited | Professional & scientific | 2017 |
| Liberty First Group Limited | Professional & scientific | 2023 |
| Liberty Market Investment Ltd | Wholesale & retail | 2019 |
| Liddell Holdings Limited | Real estate | 2026 |
| Life Learning Academy Limited | Extraterritorial | 2021 |
| Life Sciences Health Ltd | Administrative & support | 2021 |
| Lifecycle UK (2009) Limited | Wholesale & retail | 2009 |
| Lifesapitchtv Limited | Information & communication | 2023 |
| Lift & Shift (Ipswich) Ltd | Transport & logistics | 2014 |
| Lift Beauty Clinic Ltd | Other services | 1999 |
| Light Black Design Limited | Professional & scientific | 2009 |
| Light by Design Limited | Wholesale & retail | 2010 |
| Lighthouse Construction Industry Charity | Health & social care | 2012 |
| Lighthouse Construction Industry Trading Limited | Other services | 2025 |
| Lighthouse Golf Club CIC | Professional & scientific | 2020 |
| Lighthouse Platinum Limited | Financial services | 2001 |
| Lighthouse Platinum Wealth Management Limited | Administrative & support | 2001 |
| Lighthouse Women's AID Limited | Health & social care | 1998 |
| Lightning Bird Records Limited | Information & communication | 2003 |
| Lights, Play, Action Ltd | Arts & recreation | 2025 |
| Lightspeedtraining.Com Ltd | Professional & scientific | 2025 |
| Ligomi Limited | Hospitality | 2024 |