| Leeming Brothers of Haworth Ltd | Wholesale & retail | 2025 |
| Leeming Wells Hotel Ltd | Hospitality | 2021 |
| Leeways Ventilation Ltd | Construction | 2014 |
| Legacy Logistics 666 Ltd | Transport & logistics | 2024 |
| Legal Accounting Hub Ltd. | Professional & scientific | 2017 |
| Legend Holdings Limited | Real estate | 2020 |
| Leightons Estate Agency Limited | Real estate | 2022 |
| Leightons of Leeds Limited | Wholesale & retail | 1999 |
| Lemon Squeezy Kitchens and Bathrooms Limited | Wholesale & retail | 2006 |
| Lemondrops Limited | Wholesale & retail | 2013 |
| LEO Tech Enterprises Ltd | Wholesale & retail | 2026 |
| Leodis Capital Management Limited | Financial services | 2020 |
| Leona Bright Cleaning Services Ltd | Administrative & support | 2015 |
| Lewis S Construction Ltd | Construction | 2026 |
| LEY Investments Limited | Real estate | 2021 |
| LG Education Limited | Education | 2016 |
| LG Property Rentals Ltd | Real estate | 2025 |
| Lglwood Limited | Construction | 2023 |
| LH Luxury House Ltd | Other services | 2025 |
| Lhmc Services Ltd | Health & social care | 2022 |
| LHR Performance Ltd | Wholesale & retail | 2021 |
| LHS Properties Limited | Real estate | 1997 |
| Liam Routledge (LJR Joinery) Ltd | Construction | 2016 |
| Libaas by Ayra Ltd | Wholesale & retail | 2024 |
| Libertyprotection Limited | Health & social care | 2025 |
| LIE LOW Limited | Financial services | 2022 |
| Lifestyle Stairlifts Limited | Wholesale & retail | 2020 |
| Lift and Escalator Support Services Ltd | Construction | 2024 |
| Liftco Ltd | Manufacturing | 2008 |
| Lilia Rose Limited | Hospitality | 2016 |
| Lilibies Ltd | Wholesale & retail | 2016 |
| Limestone Training Limited | Administrative & support | 2011 |
| Lincoln Property Maintenance Ltd | Construction | 2019 |
| Linden Ventures Ltd | Professional & scientific | 2024 |
| Line-Mate Limited | Manufacturing | 2019 |
| Linesign Limited | Professional & scientific | 2013 |
| Ling House Properties Ltd | Real estate | 2021 |
| Link Cars Private Hire Ltd | Transport & logistics | 2024 |
| Linton Yarns Limited | Manufacturing | 2014 |
| Lion Farm Property Management Limited | Households | 2001 |
| Liquid Technologies Ltd | Information & communication | 2000 |
| Lismore Cars Limited | Wholesale & retail | 2020 |
| Literary Twisted Yoga Ltd | Hospitality | 2024 |
| Little Blossoms Day Care Nursery Limited | Education | 2013 |
| Little Karat Ltd | Wholesale & retail | 2026 |
| Live More Offline Ltd | Education | 2019 |
| Liveview Limited | Administrative & support | 2008 |
| Living Showers Ltd | Manufacturing | 2013 |
| Liyana a Ltd | Wholesale & retail | 2026 |
| Ljym and Associates Limited | Health & social care | 2021 |
| LKP2023 Ltd | Hospitality | 2015 |
| Local Pests Control Ltd | Administrative & support | 2025 |
| Lock Street (Dewsbury) Limited | Real estate | 2015 |
| Locks That Last Ltd | Manufacturing | 2023 |
| Lockyer Plumbing and Heating Limited | Construction | 2022 |
| Locovision Consulting Ltd | Professional & scientific | 2025 |
| Locum Jane Limited | Health & social care | 2023 |
| Locumledger Ltd | Information & communication | 2025 |
| Logic Sales Training Limited | Real estate | 1993 |
| Lohan Properties Limited | Real estate | 2019 |
| Longfield Place Management Company Limited | Professional & scientific | 2014 |
| Longshed Properties 2020 Limited | Hospitality | 2020 |
| Lorien Properties Ltd | Real estate | 2025 |
| Lothersdale Pet Retreat Ltd | Professional & scientific | 2023 |
| Lots of Classics Limited | Information & communication | 2021 |
| Lottee Ltd | Wholesale & retail | 2020 |
| Louise Barton Sports Massage Therapy Ltd | Professional & scientific | 2018 |
| Louise Perry Bridal Ltd | Wholesale & retail | 2015 |
| Louise Tiler Designs Limited | Arts & recreation | 2012 |
| Love Financial Limited | Professional & scientific | 2015 |
| Loved by Laura Limited | Wholesale & retail | 2025 |
| LOW Hall Limited | Hospitality | 2025 |
| LOW Street OFF Licence Limited | Wholesale & retail | 2026 |
| Lower Redcar Farm Ltd | Agriculture & fishing | 2026 |
| Lowriver Limited | Real estate | 2012 |
| LPS Projects (Yorkshire) Ltd | Construction | 2026 |
| LS Building Solutions Ltd | Construction | 2019 |
| Ltd Property UK Limited | Real estate | 2025 |
| Luciaknit International Ltd | Wholesale & retail | 2021 |
| Luf.Gg Ltd | Arts & recreation | 2024 |
| Lujo Design Solutions Ltd. | Construction | 2017 |
| Lulabay Limited | Wholesale & retail | 2020 |
| Lulabay Properties Limited | Households | 2024 |
| Lumb Croft Limited | Extraterritorial | 2016 |
| Lumb Mill Farm Management Company Limited | Households | 2021 |
| Lumineux Data Consulting Ltd | Information & communication | 2022 |
| Luna Beauty Studio Ltd | Other services | 2026 |
| Lunaura Ltd | Wholesale & retail | 2020 |
| Lunch Boxed Ltd | Hospitality | 2024 |
| Lund Butchers Limited | Wholesale & retail | 2012 |
| Lunds RUM Distillers Ltd | Hospitality | 2013 |
| Lune Valley Kitchen Services Limited | Construction | 2006 |
| Lush Furniture Ltd | Wholesale & retail | 2019 |
| Lustrotic Ltd | Wholesale & retail | 2023 |
| LUX 4 Interior Design Ltd | Wholesale & retail | 2022 |
| LUX Transfers Private Hire Ltd | Transport & logistics | 2025 |
| Luxbridge Ventures Ltd | Hospitality | 2024 |
| Luxe Living Property & Management Ltd | Real estate | 2025 |
| Luxe Optical Ltd | Health & social care | 2021 |
| Luxor Lighting Solutions Ltd | Manufacturing | 2013 |