| L&S Property Partners Limited | Real estate | 2026 |
| L.A.T Property Investments Ltd | Real estate | 2026 |
| L.P. Driving Services Ltd | Transport & logistics | 2019 |
| Laak Property Ltd | Real estate | 2026 |
| LAI Productions Ltd | Information & communication | 2026 |
| LAN Law Limited | Financial services | 2008 |
| Landsdale Investments | | 1990 |
| Lang Property Investments Limited | Real estate | 2025 |
| Langbar House Manco Limited | Real estate | 2024 |
| Langford Commercial Services Ltd | Professional & scientific | 2017 |
| Langford Enterprise Ltd | Professional & scientific | 2022 |
| Lanross Ltd | Real estate | 2025 |
| Lapwing Lets Ltd | Real estate | 2021 |
| Larkhill (Maintenance) Limited | Households | 1974 |
| Larrisoft Ltd | Information & communication | 2024 |
| Laser Construction Services Limited | Construction | 2016 |
| Lasting Structures Limited | Manufacturing | 2025 |
| Launchpad Holiday Clubs Ltd | Arts & recreation | 2026 |
| Launchpad Sports Network Limited | Administrative & support | 2024 |
| Lavender Laundry Ltd | Other services | 2016 |
| Lawn Force Wharfedale Limited | Administrative & support | 2023 |
| Lawn Star Investments Limited | Real estate | 2024 |
| Lazbar Ltd | Real estate | 2017 |
| LBI Construction Ltd | Construction | 2017 |
| Lcdc Holdings Ltd | Health & social care | 2024 |
| Ldcd Property Ltd | Real estate | 2019 |
| Leansale Limited | Manufacturing | 1992 |
| Leather and Down Limited | Wholesale & retail | 2025 |
| LEE Toros Ltd | Hospitality | 2021 |
| Leetham Holdings Ltd | Real estate | 2021 |
| Legacy Lane Property Ltd | Real estate | 2025 |
| Legal Business Support Limited | Professional & scientific | 2009 |
| Leggetter Orthopaedics Limited | Health & social care | 2015 |
| Lemarquand Limited | Information & communication | 1991 |
| Lemon Restaurants Limited | Hospitality | 2018 |
| Lenez Limited | Wholesale & retail | 2019 |
| Lenke Limited | Professional & scientific | 2022 |
| LES Sapins Limited | Health & social care | 2014 |
| LET Luce Training Ltd | Arts & recreation | 2018 |
| Lets PAY Weekly Ltd | Wholesale & retail | 2019 |
| Lexington Rand Limited | Wholesale & retail | 2015 |
| LF Hotels Limited | Hospitality | 2016 |
| LFT Property Limited | Real estate | 2006 |
| LFW Podiatry Limited | Health & social care | 2023 |
| LFW Property Management Ltd | Real estate | 2022 |
| LHK Services Ltd | Professional & scientific | 2018 |
| Lhpgroup Ltd | Hospitality | 2026 |
| Liaa Properties Ltd | Real estate | 2024 |
| Liam Mulloy Ltd | Construction | 2009 |
| Liddell Consultancy Limited | Professional & scientific | 2010 |
| Life Products Limited | Extraterritorial | 2016 |
| Lifestyle Flooring UK Leeds Ltd | Wholesale & retail | 2018 |
| Lifestyle Locations Limited | Information & communication | 2017 |
| Lifestyles Care (Yorkshire) Limited | Health & social care | 1996 |
| Lilleyron Developments Limited | Construction | 2022 |
| Limar Real Estate Ltd | Real estate | 2024 |
| Lime Kiln Furniture Limited | Manufacturing | 2013 |
| Lime People Search & Select Limited | Administrative & support | 2012 |
| Limegarth Ilkley Management Company Limited | Households | 2021 |
| Limemeadow Limited | Real estate | 1975 |
| Lineonefivesix Limited | Arts & recreation | 2022 |
| Linia Ltd | Health & social care | 2012 |
| Linthwaite (Freehold) Management Company Limited | Real estate | 2007 |
| Lion Lady Limited | Real estate | 2024 |
| Lipo Contour Limited | Extraterritorial | 2007 |
| Lishman's of Ilkley LLP | | 2021 |
| Lissomi Limited | Wholesale & retail | 2018 |
| Lister Haigh (Yorkshire) Limited | Professional & scientific | 2025 |
| Lister Horsfall (Ilkley) Limited | Wholesale & retail | 1976 |
| Little Beau Sheep Ltd | Wholesale & retail | 2019 |
| Little Blossoms Playzone Limited | Arts & recreation | 2025 |
| Little Blossoms Soft Play Ltd | Arts & recreation | 2024 |
| Little Luxury Ltd | Other services | 2017 |
| Live Support Limited | Administrative & support | 2017 |
| Liveability Ltd | Construction | 2020 |
| LJH Rentals Limited | Hospitality | 2016 |
| Ljkk Services Ltd | Professional & scientific | 2024 |
| LJV Investments Limited | Real estate | 2013 |
| LL Steakhouse Ltd | Hospitality | 2022 |
| Lloyd Property Investment Ltd | Real estate | 2024 |
| LM Hodgson Ltd | Construction | 2014 |
| LMG Fitness and Coaching Limited | Arts & recreation | 2022 |
| LMR2 Limited | Extraterritorial | 2012 |
| LMS Corporate Limited | Professional & scientific | 2014 |
| Locumotif Ltd | Professional & scientific | 2005 |
| Lodgehill Property Limited | Real estate | 2018 |
| Logo That Limited | Administrative & support | 2007 |
| London Gynaecology Practice Limited | Health & social care | 2011 |
| London Property Investments Ltd | Construction | 1956 |
| Longstaff & Associates Limited | Administrative & support | 2007 |
| Lonsdale Contracts (Leisure) Limited | Construction | 2015 |
| Lonsdale Contracts Limited | Real estate | 2008 |
| Lorna Hendry Design Limited | Professional & scientific | 2021 |
| Louis Saville Design Limited | Information & communication | 2018 |
| Love Digi Limited | Professional & scientific | 2010 |
| LOW Alcohol Ltd | Wholesale & retail | 2021 |
| Lowcrest Limited | Hospitality | 2017 |
| LRG Facades Ltd | Construction | 2024 |
| LS29 Hairteam Ilkley Limited | Other services | 2009 |
| Ltdesign (UK) Ltd | Professional & scientific | 2011 |