| Lazzani Take Away Ltd | Hospitality | 2024 |
| LCM Limited | Extraterritorial | 1993 |
| Lcms Group Limited | Other services | 2022 |
| LCP Investments Holdco Limited | Financial services | 2023 |
| LD Innovations Limited | Real estate | 2025 |
| LDH Autos Ltd | Wholesale & retail | 2025 |
| LEA Holdings Limited | Health & social care | 2017 |
| Leach Colour Limited | Manufacturing | 1999 |
| Leader Community Healthcare Limited | Administrative & support | 2024 |
| Leader Companies Holdings Limited | Financial services | 2015 |
| Leader Distribution Limited | Transport & logistics | 1999 |
| Leadership Support for Schools Limited | Education | 2011 |
| Leaf Banana Limited | Manufacturing | 2023 |
| Leaf Studio Ltd | Professional & scientific | 2025 |
| Leafield Developments Ltd | Construction | 2021 |
| Leap Technologies Limited | Professional & scientific | 2010 |
| Learn & Drive Driving School Ltd | Education | 2023 |
| Learn Aesthetics Ltd | Other services | 2021 |
| Learn With Kasim Ltd | Education | 2025 |
| LEARN2DRIVE Hudds Ltd | Education | 2025 |
| Learning Accord Multi Academy Trust | Education | 2016 |
| Learning Direct Forum CIC | Other services | 2023 |
| Learningvilla Ltd | Wholesale & retail | 2023 |
| Lease Motors Ltd | Administrative & support | 2026 |
| Leatham Estates Limited | Construction | 1998 |
| Leatham Group Limited | Financial services | 2025 |
| Leatham Holdings Limited | Professional & scientific | 1989 |
| Leather Collections UP Ltd | Wholesale & retail | 2025 |
| Leathline Ltd | Wholesale & retail | 2026 |
| LED Lighting (UK) Ltd | Manufacturing | 2012 |
| LEE England Engineering Limited | Professional & scientific | 2012 |
| LEE Holdings Ltd | Real estate | 2024 |
| LEE Johnston Limited | Arts & recreation | 2016 |
| LEE Slingsby Cars Ltd | Wholesale & retail | 2021 |
| LEE Tech Services Limited | Professional & scientific | 2026 |
| LEE Toffolo Tiling Limited | Construction | 2026 |
| Lee's Properties (Leeds) Ltd | Administrative & support | 2015 |
| Leeds Cleaners Ltd | Administrative & support | 2025 |
| Leeds Health Hub Ltd | Wholesale & retail | 2025 |
| Leeds Innovations Limited | Hospitality | 2025 |
| Leeds Metal Spinning Ltd | Manufacturing | 2015 |
| Leeds Road (Huddersfield) Management Company Limited | Real estate | 2007 |
| Leeds Road Food and Wine Store Ltd | Wholesale & retail | 2010 |
| Leeds United Conference and Events Limited | Hospitality | 2010 |
| Leeds United Media Limited | Information & communication | 2009 |
| Leejay-Mal Health Care Services Limited | Health & social care | 2022 |
| Leela Properties Limited | Real estate | 2022 |
| Legacy Investments INT. Ltd | Real estate | 2020 |
| Legacy Systems Solutions Limited | Information & communication | 2022 |
| Legends Marketing Ltd | Information & communication | 2023 |
| Leigh Holdings Limited | Professional & scientific | 2008 |
| Leigh Properties Trustees Limited | Administrative & support | 1966 |
| LEM Precision Engineering Ltd | Professional & scientific | 2019 |
| Lemans Transport Ltd | Transport & logistics | 2014 |
| Lemon Spring Ltd | Manufacturing | 2015 |
| Lemoncake Media Limited | Arts & recreation | 2013 |
| Lemoncake Music Limited | Information & communication | 2013 |
| Lemz Ltd | Administrative & support | 2018 |
| Lenica Building Solutions Limited | Construction | 2011 |
| Leocivils Ltd | Administrative & support | 2024 |
| Leods Contracts Manufacturing Limited | Manufacturing | 2001 |
| Leomax Infrastructure Ltd | Construction | 2023 |
| Leppard Coaching & Development Limited | Professional & scientific | 2013 |
| Lepton C E Pre-School | Professional & scientific | 2005 |
| Lepton Food & Wine Ltd | Wholesale & retail | 2023 |
| Lepton Highlanders Sports and Social Club Ltd | Hospitality | 2023 |
| Lepton Service Station Ltd | Wholesale & retail | 2013 |
| Lepton Spice Ltd | Hospitality | 2015 |
| Lepton Village Spice Ltd | Hospitality | 2026 |
| Leris Ltd | Professional & scientific | 2025 |
| LES Newby Associates Limited | Professional & scientific | 2011 |
| Lesjofors Springs (UK) Limited | Wholesale & retail | 1990 |
| Lesjofors Springs Limited | Extraterritorial | 1995 |
| LET and Move Limited | Real estate | 2021 |
| LET IT B Lettings Ltd | Real estate | 2017 |
| LET IT B Properties Limited | Real estate | 2017 |
| LET US Speak OUT CIC | Health & social care | 2026 |
| Let's Go (Yorkshire) CIC | Education | 2011 |
| Let's Thrive Limited | Health & social care | 2025 |
| Lettkings Accommodation Services Limited | Real estate | 2026 |
| Level UP Hairdressing and Barbering Training Academy Ltd | Education | 2025 |
| Level UP Project Solutions Limited | Professional & scientific | 2018 |
| Level UP Rugby League Ltd | Arts & recreation | 2024 |
| Levels (Huddersfield) Ltd | Arts & recreation | 2019 |
| Leveltower Properties Limited | Professional & scientific | 1996 |
| Leverlang Developments Ltd | Construction | 2019 |
| Leviart Marketing Ltd | Professional & scientific | 2020 |
| Lewico Limited | Professional & scientific | 2024 |
| Lewis and Co Interior Build Limited | Construction | 2025 |
| Lewis J. Riley Limited | Agriculture & fishing | 1975 |
| Lewis Writes Ltd | Professional & scientific | 2023 |
| Leyla's Empire Ltd | Wholesale & retail | 2023 |
| Leymoor Farm Ltd | Agriculture & fishing | 2026 |
| Lf.Delivery Ltd | Transport & logistics | 2025 |
| LFT Drinks Ltd | Manufacturing | 2024 |
| LGF Investments Limited | Financial services | 2025 |
| LHC Sports Massage Ltd | Other services | 2024 |
| LHH Consulting Limited | Information & communication | 2021 |
| Liam and Sons Construction Ltd | Construction | 2026 |
| Liam Property Investment Ltd | Financial services | 2024 |