| Ledston Hall Limited | Real estate | 2022 |
| LEE Walker Building Ltd | Construction | 2013 |
| Leeds Asset Management Ltd | Wholesale & retail | 2024 |
| Leeds Crammer LLP | | 2013 |
| Leeds Fashion Works Limited | Professional & scientific | 2012 |
| Leeds Real Estate Ltd | Real estate | 2012 |
| Leeds Road Properties LLP | | 2005 |
| Leekbrook Developments Limited | Construction | 2010 |
| Legacy Delivery Limited | Arts & recreation | 2000 |
| Legacy Jewellery Limited | Manufacturing | 2021 |
| Legal BOB Limited | Professional & scientific | 2015 |
| Legal Expert Limited | Extraterritorial | 2011 |
| Legalcanna Ltd | Professional & scientific | 2026 |
| Legaltech Solutions Ltd | Information & communication | 2018 |
| Legend Education Ltd | Information & communication | 2025 |
| Legend Group Limited | Extraterritorial | 2025 |
| Leigh Parsons Limited | Real estate | 2011 |
| Leigh Powell Limited | Extraterritorial | 2026 |
| Leighton Medical Limited | Extraterritorial | 2026 |
| Leisure Infrastructure Investors Limited | Professional & scientific | 2010 |
| Leisure Park Internet Solutions (Employee Ownership Trust) Limited | Extraterritorial | 2023 |
| Lemon Melon Media Ltd | Professional & scientific | 2022 |
| Lennova Services Ltd | Professional & scientific | 2019 |
| Lentinsmith Limited | Real estate | 2018 |
| LEO Project Services Limited | Professional & scientific | 2023 |
| Leosales Ltd | Professional & scientific | 2025 |
| Lepi HG1 Ltd | Real estate | 2023 |
| Lepi Ltd | Real estate | 2023 |
| Leradeca Limited | Professional & scientific | 2019 |
| LES Beonix Ltd | Extraterritorial | 2013 |
| LES Solutions Ltd | Information & communication | 2025 |
| Lester Developments (North West) Limited | Extraterritorial | 2008 |
| LET ME SEE Ltd | Households | 2019 |
| Leto Property Limited | Real estate | 2022 |
| Lets Liverpool Ltd | Real estate | 2012 |
| Levels Barbershop North Leeds Ltd | Other services | 2023 |
| Levulo Labs Ltd | Manufacturing | 2026 |
| LEW1S Limited | Extraterritorial | 2018 |
| Lexton Care Services Limited | Health & social care | 2018 |
| Leyton Lees Ltd | Real estate | 2016 |
| Lfmwb Consulting Limited | Information & communication | 2018 |
| LG Consulting Solutions Ltd | Administrative & support | 2022 |
| LGL ARK Limited | Financial services | 2016 |
| LH and LS Services Ltd | Wholesale & retail | 2024 |
| LHC Consultants Limited | Professional & scientific | 2014 |
| Liabilities Limited | Financial services | 1998 |
| Liam Barnard Copy Ltd | Professional & scientific | 2019 |
| Liam O'Neill Golf Ltd | Arts & recreation | 2021 |
| Libertas Professional Services LLP | | 2025 |
| Liberty Asquith Media UK Limited | Administrative & support | 2024 |
| License Limited | Extraterritorial | 2012 |
| Lidster Property Services Ltd | Construction | 2024 |
| Life & Soul Trading Limited | Wholesale & retail | 2018 |
| Life Learning Limited | Education | 2012 |
| Life Skills Limited | Extraterritorial | 2011 |
| Lifebest Limited | Real estate | 2017 |
| Lifelina Limited | Real estate | 2018 |
| Lifeline (Harrogate) Limited | Health & social care | 2012 |
| Light and Loud Ltd | Information & communication | 2026 |
| Light Beauty Ltd | Wholesale & retail | 2022 |
| Light Planning and Design Limited | Administrative & support | 2020 |
| Light Seat Ltd | Wholesale & retail | 2025 |
| Lightbound Limited | Manufacturing | 2023 |
| Lightening Logistics Ltd | Transport & logistics | 2021 |
| Lightico Ltd | Professional & scientific | 2020 |
| LIGHTS4FUN Limited | Wholesale & retail | 2007 |
| Lightworker Coach Limited | Administrative & support | 2024 |
| Lillybay Ventures Limited | Extraterritorial | 2017 |
| LIM & LEE Estate Group Ltd | Real estate | 2025 |
| Limelight HR Ltd | Administrative & support | 2021 |
| Limitless Partners Ltd | Administrative & support | 2025 |
| Lindam Limited | Wholesale & retail | 1988 |
| Lindisfarne Care Home Limited | Health & social care | 2002 |
| Lingotech Limited | Information & communication | 2006 |
| Links Investment Holdings Limited | Financial services | 2017 |
| Links NY Ltd | Wholesale & retail | 2014 |
| Lintex Ortho Limited | Manufacturing | 2018 |
| Linton Falls Hydroelectric Power Company Limited | Energy | 2010 |
| Linton Springs Management Company Limited | Households | 2020 |
| Lintona Ltd | Real estate | 2012 |
| Lion & Rose Properties Ltd | Extraterritorial | 2024 |
| Lionel Ollivier Limited | Extraterritorial | 2026 |
| Lionheart Portfolio Ltd | Wholesale & retail | 2015 |
| Liqour Limited | Extraterritorial | 2021 |
| Liquid Elements UK Ltd | Wholesale & retail | 2026 |
| Lisa Attenborough Consulting Limited | Professional & scientific | 1997 |
| Lishman Sidwell Campbell & Price Trustees Limited | Professional & scientific | 1984 |
| Lissa Kershaw Limited | Professional & scientific | 2008 |
| Lister and Lister Group Limited | Financial services | 2022 |
| Lister and Lister Trustees Limited | Administrative & support | 2022 |
| Lister Blinds & Shutters (HG) Ltd | Manufacturing | 2024 |
| Lister Hart Limited | Extraterritorial | 2025 |
| Lister Medical Limited | Extraterritorial | 2025 |
| Lister Trading Limited | Other services | 2021 |
| Listers Interiors Ltd | Wholesale & retail | 2025 |
| LIT Entertainment Ltd | Information & communication | 2022 |
| Lithgow Perkins LLP | | 2001 |
| Little Blue Limited | Extraterritorial | 2021 |
| Little Breads Limited | Hospitality | 2015 |
| Little Darlings of Harrogate Limited | Wholesale & retail | 2019 |