| Lees Flooring Ltd | Construction | 2019 |
| Leeson & SON Limited | Health & social care | 2012 |
| Lefter Ltd | Information & communication | 2011 |
| LEG of Lamb Communications Limited | Professional & scientific | 2006 |
| Legacy Properties York Limited | Real estate | 2026 |
| Legacy Safety Consulting Ltd | Professional & scientific | 2024 |
| Legacy Wake Group Ltd | Other services | 2026 |
| Legal & Trade Ltd | Professional & scientific | 2022 |
| Leger Interiors Ltd | Construction | 2003 |
| Legions Gym Boxing Club CIC | Arts & recreation | 2025 |
| Legions Gym Limited | Arts & recreation | 2016 |
| Lehany Ltd | Professional & scientific | 2022 |
| Leighton Enterprises Ltd | Professional & scientific | 2021 |
| Leighton Matthews Enterprises Limited | Transport & logistics | 2025 |
| Leighton-Harvey Ltd | Wholesale & retail | 2022 |
| Leila Playa NO.4 Limited | Arts & recreation | 1986 |
| Leilan Property Services Ltd | Households | 2021 |
| Leisurama Homes Limited | Extraterritorial | 1964 |
| Leisure Construct Ltd | Manufacturing | 2024 |
| Leisure Spares Ltd | Wholesale & retail | 2000 |
| Leisureland (Pocklington) Ltd | Hospitality | 2024 |
| Lejs Properties Limited | Real estate | 2022 |
| LEM Designs Ltd | Professional & scientific | 2018 |
| Lemerg Property and Commercial Cleaning Ltd | Administrative & support | 2026 |
| Lenchwick Developments Ltd | Professional & scientific | 2022 |
| Lenchwick Properties Ltd | Real estate | 2022 |
| Lendal Design Limited | Wholesale & retail | 2011 |
| Lendal Holdings Limited | Financial services | 2026 |
| Lendal Property Company Limited | Extraterritorial | 2010 |
| Lendal Retail Limited | Extraterritorial | 2013 |
| Lendoris Ltd | Professional & scientific | 2025 |
| Lennox Brookes Developments Ltd | Construction | 2020 |
| Lennox Property Ltd | Construction | 2015 |
| Lennox Residential Lettings Limited | Real estate | 2018 |
| Lens Offshore Services Ltd | Manufacturing | 2018 |
| Leopard Creek 69 Limited | Real estate | 2012 |
| Leopard Creek Consulting Limited | Professional & scientific | 2016 |
| Leopard Development (York) Limited | Construction | 2023 |
| Lepus Investments Ltd | Financial services | 2021 |
| LES Girandoles Limited | Extraterritorial | 2025 |
| LES WIX Associates Limited | Professional & scientific | 2010 |
| Lessicas Limited | Arts & recreation | 2018 |
| LET World Limited | Real estate | 2016 |
| Let's Maintain (York) Ltd | Water & waste | 2017 |
| Let's Make Lemonade Limited | Administrative & support | 2022 |
| Let's Stay York Ltd | Real estate | 2024 |
| Let's Talk Swedish Ltd | Education | 2024 |
| Letco Group Limited | Professional & scientific | 2016 |
| Letco Limited | Real estate | 2007 |
| Letliv Ltd | Real estate | 2016 |
| Lets Move Property Limited | Real estate | 2008 |
| Lets Test Ltd | Professional & scientific | 2015 |
| Letsentry Ltd | Information & communication | 2026 |
| Letssy (UK) Ltd | Real estate | 2022 |
| Letssy Cleaning Ltd | Administrative & support | 2024 |
| Letts Move Limited | Real estate | 2017 |
| Let’S Clean York Limited | Administrative & support | 2022 |
| Let’S Talk About IT Ltd | Health & social care | 2023 |
| Levantar Limited | Professional & scientific | 2010 |
| Level UP Joinery & Developments Ltd | Construction | 2022 |
| Levinthorpe Leisure Ltd | Hospitality | 2019 |
| Levios AI Ltd | Information & communication | 2026 |
| Lewex Distribution Ltd | Wholesale & retail | 2023 |
| Lewis & Ewan Ltd | Real estate | 2026 |
| Lewis Auto Centre Limited | Wholesale & retail | 2015 |
| Lewis Butcher Sport Ltd | Education | 2019 |
| Lewis Jones Plumbing and Heating Ltd | Construction | 2026 |
| Lewis Letting Ltd | Real estate | 2016 |
| Lewis Pennington Associates Ltd | Transport & logistics | 2010 |
| Lewis Pope Ltd | Real estate | 2020 |
| Lewis Tickle Limited | Construction | 2003 |
| Lewis Tree Surgery York Ltd | Agriculture & fishing | 2020 |
| Lewis Winzar Ltd | Wholesale & retail | 2024 |
| Lexello Marketing Ltd | Transport & logistics | 2016 |
| Lexon Technology Ltd | Wholesale & retail | 2021 |
| Lexonelec Ltd | Wholesale & retail | 2022 |
| Leysthorpe Ltd | Construction | 2024 |
| Lezira Limited | Wholesale & retail | 2020 |
| LF & JG Holdings Ltd | Real estate | 2016 |
| Lfargher Ltd | Real estate | 2026 |
| Lfccffae Management Limited | Professional & scientific | 2024 |
| LFD (York) Ltd | Wholesale & retail | 2018 |
| LG MG Properties Ltd | Real estate | 2015 |
| LGA Supplies Ltd | Wholesale & retail | 2011 |
| LGL Group Limited | Financial services | 2017 |
| LGS Construction & Groundworks Ltd | Construction | 2020 |
| LGS Projects Ltd | Construction | 2003 |
| LGS Property Rentals Ltd | Real estate | 2026 |
| LGW Car Sales Limited | Wholesale & retail | 2013 |
| LH Clinical Research Limited | Other services | 2016 |
| LH Lodges Ltd | Construction | 2024 |
| LHH (Holdings) Limited | Professional & scientific | 2014 |
| LHL Group Limited | Professional & scientific | 2005 |
| LHR Catering Limited | Hospitality | 2002 |
| Libbyco Limited | Hospitality | 2022 |
| Liber Invest Limited | Financial services | 2025 |
| Libertas Motors Ltd | Wholesale & retail | 2023 |
| Libertas Opes Consulting Limited | Professional & scientific | 2014 |
| Libertas Technical Services Ltd | Manufacturing | 2021 |
| Liberty Gate (Lakenheath) Residents Management Company Limited | Households | 2024 |