| LA Tax Advisory Ltd | Professional & scientific | 2024 |
| Lady Jasmine Limited | Hospitality | 2019 |
| Lake Fixings Ltd | Construction | 2019 |
| Lakeside Consulting Ltd | Professional & scientific | 2021 |
| Lakeside Property Lettings Ltd | Real estate | 2020 |
| Lakeside Roofing Ltd | Construction | 2012 |
| Lala Valeting 123 Ltd | Other services | 2024 |
| Landchain Limited | Administrative & support | 2002 |
| Landchain Strategic Ltd | Real estate | 2021 |
| Landhurst Electrical Services Limited | Construction | 1983 |
| Lane Property & Assets Ltd | Real estate | 2016 |
| Langley Heath Barns Management Company Limited | Real estate | 2008 |
| LAQ 2025 Ltd | Hospitality | 2025 |
| Last Homely House Ltd | Hospitality | 2026 |
| Laundry Lounge 75 Ltd | Administrative & support | 2024 |
| Laurenkategriffiths Limited | Professional & scientific | 2025 |
| Lavdor Ltd | Construction | 2020 |
| LB Software Ltd | Information & communication | 2013 |
| LDC Business Consulting Limited | Professional & scientific | 2014 |
| Ldprestorations Ltd | Construction | 2025 |
| Leadership Edge 2018 Ltd | Professional & scientific | 2018 |
| Learn Laugh Play Ltd | Education | 2022 |
| Leather England Limited | Manufacturing | 2010 |
| Leddington Hairdressing Limited | Other services | 2013 |
| LEE Eccles Butchers Ltd | Wholesale & retail | 2019 |
| Lee's Installations Limited | Construction | 2016 |
| Legal Ventures Limited | Administrative & support | 2020 |
| Legg Brothers Holdings Limited | Real estate | 1982 |
| Leigh Alex Limited | Real estate | 2022 |
| Leitus Limited | Financial services | 2018 |
| LEO Transports ( PVT) Ltd | Transport & logistics | 2020 |
| Leonard Bowes (Engineering) Company Limited | Manufacturing | 1961 |
| Lessey Properties Ltd | Real estate | 2025 |
| Let's Go Bunting Mental Limited | Wholesale & retail | 2025 |
| Levant Consultancy Ltd | Health & social care | 2019 |
| Levant Orthopaedics Ltd | Manufacturing | 2011 |
| Level 1 Fitness and Education Limited | Education | 2020 |
| Levi Walters Metal Merchants Limited | Wholesale & retail | 2008 |
| Leviathan Limited | Administrative & support | 2012 |
| Lgbi Limited | Financial services | 2019 |
| Liberty Developments Limited | Construction | 2015 |
| Libra Pipelines Limited | Construction | 2013 |
| Lifescaped Limited | Professional & scientific | 2010 |
| Lifted by Lauren Ltd | Other services | 2023 |
| Lifting Equipment Limited | Extraterritorial | 2023 |
| Lifting Gear Direct Limited | Manufacturing | 2003 |
| Lifting Hoists Direct Limited | Extraterritorial | 2016 |
| Light WRK Productions Limited | Administrative & support | 2023 |
| Links Corporate Limited | Professional & scientific | 2014 |
| Links Group Holdings Limited | Financial services | 2024 |
| Lisa Evans Limited | Arts & recreation | 2019 |
| Lisa Evans Properties Limited | Real estate | 2019 |
| Lisi Florist Ltd | Wholesale & retail | 2026 |
| Little Cat Property Investments Limited | Real estate | 2025 |
| Little Oak Transport Ltd | Transport & logistics | 2023 |
| Live and Look Limited | Financial services | 2013 |
| Live at the Local Ltd | Information & communication | 2026 |
| LJ5 Properties Limited | Real estate | 2025 |
| LJB Construction Limited | Construction | 2022 |
| LK Auto House Limited | Wholesale & retail | 2026 |
| LK Top Trading Limited | Wholesale & retail | 2020 |
| LKL3 Properties Limited | Real estate | 2025 |
| LKS1 Properties Limited | Real estate | 2023 |
| LL Seven Management Limited | Arts & recreation | 2019 |
| LL Seven Properties Limited | Real estate | 2023 |
| Llej Development Ltd | Construction | 2026 |
| Lloyd James Europe Limited | Professional & scientific | 2015 |
| Lloyd James Media Ltd | Professional & scientific | 2011 |
| LLW Building Services Ltd | Construction | 2022 |
| LLX Properties Limited | Real estate | 2022 |
| LMP Property (Midlands) Limited | Real estate | 2022 |
| LMS Worldwide Ltd | Arts & recreation | 2011 |
| Lock & Key Home Surveys Ltd | Professional & scientific | 2022 |
| Lockdren Limited | Professional & scientific | 1989 |
| Loddon Equestrian Ltd | Manufacturing | 2022 |
| Logistor Limited | Construction | 2018 |
| Logistore Ltd | Construction | 2021 |
| Logs of LYE Ltd | Agriculture & fishing | 2015 |
| Longhart Limited | Manufacturing | 1986 |
| Longside Consulting Limited | Professional & scientific | 2020 |
| Lorcan Williams Properties Limited | Real estate | 2024 |
| Lorenco Products Limited | Wholesale & retail | 2003 |
| Lothian Consultants Ltd | Professional & scientific | 2019 |
| Lotus Creative Coaching Ltd | Administrative & support | 2025 |
| Loughborough Climbing Wall Limited | Arts & recreation | 2010 |
| Loyal Bond Limited | Professional & scientific | 2026 |
| LPA 4U Ltd | Professional & scientific | 2021 |
| LPF19 Properties Limited | Real estate | 2021 |
| LR Advertising Ltd | Professional & scientific | 2022 |
| Lrcc Limited | Construction | 2005 |
| LT Homes Ltd | Real estate | 2024 |
| Luca J Properties Ltd | Real estate | 2025 |
| Lucetta Aesthetic's Limited | Other services | 2021 |
| Lucrum Property Management Ltd | Construction | 2021 |
| Lucy the Lollipop Lady Limited | Professional & scientific | 2022 |
| Luis Binks Properties Ltd | Real estate | 2026 |
| Luke Woodhouse Darts Limited | Arts & recreation | 2020 |
| Luke-Lx Limited | Professional & scientific | 2020 |
| Lumé Beauty Lounge Ltd | Other services | 2025 |
| Lunar Products Ltd | Wholesale & retail | 2022 |