| Launch Ready Ltd | Other services | 2025 |
| Laura Robinson PR Ltd | Professional & scientific | 2022 |
| Laura's Catering Ltd | Hospitality | 2018 |
| Laura's Fit Loves Limited | Arts & recreation | 2021 |
| Laurel and Steel Limited | Professional & scientific | 2023 |
| Lavender Hill Florist Limited | Wholesale & retail | 2023 |
| Lavish Beds Y&H Limited | Wholesale & retail | 2021 |
| Lawefield Park Management Company Ltd | Households | 2011 |
| Lawi Builders Ltd | Construction | 2025 |
| Lawson Wright Studios Limited | Professional & scientific | 2012 |
| Laytrad Ltd | Wholesale & retail | 2014 |
| LB Building Control Limited | Professional & scientific | 2007 |
| LBE Maintenance Service Ltd | Water & waste | 2019 |
| LBJ Cladding and Facades UK Limited | Construction | 2017 |
| LCK Accounting Services Ltd | Professional & scientific | 2024 |
| LD Properties Halifax Ltd | Financial services | 2022 |
| LDV Professional Development Limited | Other services | 2022 |
| LE Cafe at Glebe Farm Limited | Hospitality | 2019 |
| LEA Farm Drive 1962 Limited | Extraterritorial | 2013 |
| Leading Bars Ltd | Hospitality | 2023 |
| Leading Edge Building and Joinery Ltd | Construction | 2018 |
| Leafield Protect Ltd | Financial services | 2018 |
| Lean Control Innovations Ltd | Manufacturing | 2015 |
| Learel Ltd | Professional & scientific | 2025 |
| Learn to Drive Pro Ltd | Information & communication | 2022 |
| Learnest CIC | Information & communication | 2019 |
| Learning 4 More Limited | Education | 2021 |
| Learning With AWE Ltd | Professional & scientific | 2023 |
| Least Limited | Manufacturing | 2017 |
| Leave IT to Lottie Ltd | Administrative & support | 2024 |
| LEC Utilities Ltd | Construction | 2022 |
| LED Sports Limited | Arts & recreation | 2017 |
| Ledgerly Ltd | Professional & scientific | 2020 |
| LEE Allott Builder Limited | Construction | 2015 |
| LEE Bosah Electrical Ltd | Construction | 2021 |
| LEE Lites Limited | Construction | 2019 |
| LEE Moor Construction Ltd | Construction | 2015 |
| Leeds Basketball CIC | Arts & recreation | 2023 |
| Leeds Bridge House Ltd | Real estate | 2025 |
| Leeds Law Society(The) | Other services | 1870 |
| Leeds Legal Limited | Other services | 2006 |
| Leeds Lifting Gear Co. Limited | Manufacturing | 2002 |
| Leeioscofio Limited | Health & social care | 2018 |
| Leemak Properties Ltd | Real estate | 2025 |
| Leesy Motors Limited | Wholesale & retail | 2020 |
| Legacy Foods Ltd | Wholesale & retail | 2024 |
| Legacy Property Sourcing Group Ltd | Real estate | 2025 |
| Legal Fresh Services Ltd | Wholesale & retail | 2025 |
| Legal Resource Solutions Limited | Professional & scientific | 2012 |
| Legal Templates Ltd | Wholesale & retail | 2025 |
| Legends Off-Licence Ltd | Wholesale & retail | 2025 |
| Lehi James Limited | Wholesale & retail | 2013 |
| Lehrinstitut Fuer DEN Rettungsdienst LFR Limited | Administrative & support | 2006 |
| Leisure Finance Plan Limited | Administrative & support | 1999 |
| Leisure Ninety Nine Skipton Ltd | Hospitality | 2013 |
| Lemon Square Catering Ltd | Hospitality | 2026 |
| Lemon Tree Lettings Limited | Real estate | 2025 |
| Lending Real Estate Ltd | Real estate | 2022 |
| Lenken Limited | Wholesale & retail | 2013 |
| LEO Properties NW Limited | Real estate | 2022 |
| Leodis Academies Trust | Education | 2011 |
| Leodis Academy Services Ltd. | Education | 2012 |
| Leodis Search Ltd | Administrative & support | 2025 |
| Lepus (Nottingham) Limited | Construction | 2022 |
| Lerato Limited | Health & social care | 2020 |
| Les.Collinson Limited | Wholesale & retail | 1966 |
| Lesley Seary Ltd | Professional & scientific | 2019 |
| Leslie Group Limited | Manufacturing | 1981 |
| LET by Kate Ltd | Real estate | 2023 |
| Lethubuhle Ltd | Health & social care | 2021 |
| Lets Brand IT Ltd | Manufacturing | 2026 |
| Lets Face IT Aesthetics Leeds Ltd | Other services | 2024 |
| Lets Pump IT Ltd | Manufacturing | 2025 |
| Lets Rush Ltd | Real estate | 2023 |
| Letsbuild Yorkshire Ltd | Construction | 2024 |
| Letterbox Magic Limited | Wholesale & retail | 2017 |
| Letterpress Services International Ltd | Manufacturing | 2017 |
| Letterpress Services Limited | Manufacturing | 2002 |
| Letting Complete Limited | Real estate | 2013 |
| Lettinglodge Ltd | Real estate | 2025 |
| Letts Properties Limited | Real estate | 2017 |
| Level UP Access Ltd | Other services | 2020 |
| Levels Above Group Holdings Ltd | Financial services | 2025 |
| Levels Above Property Services Ltd | Real estate | 2022 |
| Levels Above Site Services Ltd | Administrative & support | 2020 |
| Levels Above Site Services NW Ltd | Administrative & support | 2023 |
| Lewington Limited | Construction | 2013 |
| Lewisk Ltd | Transport & logistics | 2026 |
| Lexitas Admin Limited | Administrative & support | 2025 |
| Lexlights & More Limited | Administrative & support | 2005 |
| Leygraff & Partner Assoc. Holdings Limited | Administrative & support | 2001 |
| Lf&Lf Property Ltd | Real estate | 2025 |
| LFM Psychiatric Care Ltd | Health & social care | 2019 |
| Lhsm Ltd | Construction | 2021 |
| Liahona Group Ltd | Financial services | 2026 |
| Libberal Ltd | Hospitality | 2024 |
| Liberty Charters Ltd | Professional & scientific | 2019 |
| Liberty DC Properties Limited | Other services | 2013 |
| Liberty Smiles Ltd | Health & social care | 2022 |
| Libra Solutions Limited | Professional & scientific | 2023 |