| LEE Mount Holdings Limited | Financial services | 2026 |
| LEE Stephenson Ltd | Construction | 2018 |
| Leebrad Productions Limited | Information & communication | 2012 |
| Leeds Anaesthetic Services LLP | | 2024 |
| Leeds and London BK Limited | Real estate | 2023 |
| Leeds Colorectal Ltd | Health & social care | 2018 |
| Leeds Construction (Developments) Limited | Construction | 2018 |
| Leeds Construction Services (Developments) Limited | Construction | 2017 |
| Leeds Plumbing & Heating Limited | Construction | 2018 |
| Leeds Women's AID | Hospitality | 1991 |
| Leem Properties Ltd | Real estate | 2025 |
| Leemount Balti House Ltd | Hospitality | 2020 |
| Legacy Writing Ltd | Professional & scientific | 2021 |
| Legal Wise Assist Ltd | Professional & scientific | 2014 |
| Leigh Taylor Design Ltd | Information & communication | 2013 |
| Leighmont Brokerage Ltd | Wholesale & retail | 2025 |
| Leisuredays Limited | Extraterritorial | 2002 |
| Lelant Quay Limited | Construction | 2018 |
| LEO Aviation Limited | Transport & logistics | 2016 |
| LEO Group Holdings Limited | Extraterritorial | 2017 |
| LEO Group Limited | Professional & scientific | 2001 |
| LEO Sawrij Limited | Real estate | 1977 |
| Lepol Fire & Security Ltd | Professional & scientific | 2009 |
| Lepton Village Store Ltd | Wholesale & retail | 2026 |
| Let's Buy and Save Limited | Wholesale & retail | 2025 |
| Lets GET Minted Limited | Information & communication | 2022 |
| Leukos Pines Ltd | Wholesale & retail | 2024 |
| Lewgeo Ltd | Information & communication | 2018 |
| Lewil Limited | Other services | 2016 |
| Lewis Brown Homes Ltd | Real estate | 2018 |
| Lewis Farr Limited | Other services | 2014 |
| Lewis Fibre Innovations Ltd | Construction | 2024 |
| Lewis FOX & Sons Limited | Construction | 1962 |
| LEX Cryptographia Limited | Information & communication | 2023 |
| Lexic Learning Limited | Professional & scientific | 2018 |
| LG Caring Ltd | Health & social care | 2016 |
| LGS Commercials Limited | Administrative & support | 2005 |
| LGS Yorkshire Limited | Real estate | 2026 |
| LHF Energy Limited | Energy | 2014 |
| LHF Services Limited | Professional & scientific | 2019 |
| Liberty Dental Group Ltd | Health & social care | 2022 |
| Libra Star Limited | Health & social care | 2018 |
| License to Go Ltd | Information & communication | 2022 |
| LID Safe Ltd | Wholesale & retail | 2020 |
| Liebekinder Logistics Limited | Transport & logistics | 2018 |
| Life's Moments Group Ltd | Wholesale & retail | 2021 |
| Lift & Gearwork Services Limited | Manufacturing | 2013 |
| Liftpoint Advertising Ltd | Professional & scientific | 2025 |
| Lightcliffe Golf Club (1951) Limited | Arts & recreation | 1951 |
| Lighthouse Lane Ltd | Wholesale & retail | 2019 |
| Lili PAD Holdings Limited | Financial services | 2016 |
| Liliths Larder Ltd | Hospitality | 2026 |
| Lilly's Holdings Ltd | Real estate | 2024 |
| Lily & Hops Ltd | Wholesale & retail | 2018 |
| Lima Accountancy Services Ltd | Professional & scientific | 2011 |
| Lime Tree Europe Limited | Wholesale & retail | 2014 |
| Limitless Calderdale Ltd | Health & social care | 2021 |
| Lincoln Sharma Ltd | Wholesale & retail | 2024 |
| Linda's Inns Limited | Hospitality | 2017 |
| Linden Mews (Halifax) Limited | Extraterritorial | 2015 |
| Lindley Adams Investments Ltd | Financial services | 2021 |
| Lindley Adams Limited | Professional & scientific | 2000 |
| Link Research Services Limited | Professional & scientific | 2025 |
| Linksland Enterprises Limited | Information & communication | 1995 |
| Lints Distribution Limited | Wholesale & retail | 2023 |
| Lion Estate and Investment Company Limited | Real estate | 1921 |
| Liqa Limited | Construction | 2025 |
| Lisa Roberts Aesthetics Limited | Other services | 2018 |
| Lister Holdings (Halifax) Ltd | Real estate | 2024 |
| Lister Horsfall Holdings Limited | Financial services | 2020 |
| Lister Horsfall Limited | Wholesale & retail | 1920 |
| Lister Trade Ltd | Hospitality | 2024 |
| Litjens Holdings Ltd | Wholesale & retail | 2022 |
| Little Box Consulting Limited | Construction | 2007 |
| Little Box House Management Company Limited | Households | 1999 |
| Little Box Kitchen (Yorkshire) Limited | Manufacturing | 2026 |
| Little Fern Trading Co Limited | Hospitality | 2019 |
| Little Foot Day Nursery Limited | Health & social care | 2019 |
| Little Grandma's Playgym Ltd | Health & social care | 2019 |
| Little John's Big Clothing Company Limited | Wholesale & retail | 2004 |
| Little Lotus Ltd | Hospitality | 2014 |
| Little Muslim Books Limited | Information & communication | 2017 |
| Little Ones Essentials Ltd | Wholesale & retail | 2022 |
| Little Red HEN International Limited | Administrative & support | 2020 |
| Little Truckers Haulage Limited | Transport & logistics | 2017 |
| Littlewood Communications Limited | Information & communication | 2025 |
| Liv&Liv Extreme Ltd | Transport & logistics | 2018 |
| Living Lightly Limited | Professional & scientific | 1996 |
| Liyana Hussain Properties Limited | Real estate | 2025 |
| Lizzielane Limited | Wholesale & retail | 2022 |
| LJ Consulting Solutions Limited | Information & communication | 2019 |
| Lk&S Property Services Ltd | Construction | 2019 |
| Lk&S Property’S Limited | Households | 2025 |
| LKC Solutions Limited | Transport & logistics | 2024 |
| LLL Property Investments Ltd | Real estate | 2024 |
| Lloyd (Contractors Plant) Limited | Administrative & support | 1974 |
| Lloyd Plant (Hire) Limited | Administrative & support | 1964 |
| Lloyds Electrical Contracting Ltd | Construction | 2020 |
| LLR Consulting Ltd | Other services | 2023 |
| LM Joinery & Construction Services Ltd | Arts & recreation | 2025 |