| Lincoln Road Newsagency Limited | Wholesale & retail | 2008 |
| Linctel Ltd | Information & communication | 1996 |
| Lindley Street Developments Ltd | Construction | 2019 |
| Line of Beauty Limited | Other services | 2018 |
| Lines Motor Repairs Limited | Wholesale & retail | 2016 |
| Lingforest Road Ltd | Hospitality | 2024 |
| Link Bathroom Sales Limited | Wholesale & retail | 2010 |
| Link Integrated Security Solutions Limited | Administrative & support | 2016 |
| Linney Activate Limited | Extraterritorial | 2017 |
| Linney Create Limited | Extraterritorial | 2017 |
| Linney Evaluate Limited | Extraterritorial | 2017 |
| Linney Make Limited | Extraterritorial | 2017 |
| Linq Finance Group Limited | Administrative & support | 2018 |
| Lion Secure Despatch Limited | Transport & logistics | 2003 |
| Lionhead AGE Ltd | Construction | 2026 |
| LIS Audio Visual Ltd | Construction | 2022 |
| Lisas Beauty Ltd | Wholesale & retail | 2016 |
| Lisas Medicare Limited | Health & social care | 2026 |
| Lister Mortgages Limited | Real estate | 2016 |
| Litecroft Limited | Wholesale & retail | 2011 |
| Little Frequencies Ltd | Professional & scientific | 2026 |
| Little Haven (Mansfield) Management Company Limited | Households | 2017 |
| Littleworth Property Management Company Ltd | Real estate | 2014 |
| Live and LET Buy Properties Ltd | Hospitality | 2019 |
| Livepay Ltd | Information & communication | 2022 |
| Living by Croft Limited | Households | 2025 |
| Livit Investments Limited | Health & social care | 2010 |
| Livs and Sons Solutions Ltd | Transport & logistics | 2024 |
| LJ Bartle Ltd | Hospitality | 2009 |
| LKR Industrial Services Limited | Professional & scientific | 2006 |
| Lkss Ltd | Hospitality | 2026 |
| LM Fencing Ltd | Construction | 2018 |
| LM Legal Costs Ltd | Professional & scientific | 2024 |
| LM Project Management Ltd | Construction | 2017 |
| LM Rutherford Retail Ltd | Real estate | 2006 |
| LML Bars Ltd | Hospitality | 2025 |
| LML Lettings Ltd | Real estate | 2020 |
| LML Transport Hub Ltd | Transport & logistics | 2024 |
| LML Transport Ltd | Wholesale & retail | 2014 |
| Lnagb Ltd | Wholesale & retail | 2025 |
| LNB Holdings Ltd | Other services | 2022 |
| LNZ Trading Company Limited | Real estate | 2023 |
| Local Basket Ltd | Wholesale & retail | 2026 |
| Local Vision Property Limited | Construction | 2023 |
| Locally Farmed Limited | Wholesale & retail | 2022 |
| Location Properties Ltd | Real estate | 2017 |
| Lock Plumbing & Heating Ltd | Construction | 2023 |
| Locuming and Ultrasound Services Ltd | Professional & scientific | 2022 |
| Lodat Group Ltd | Construction | 2023 |
| Lodge Farm Organics Ltd | Agriculture & fishing | 2022 |
| Logical Construction Limited | Construction | 2018 |
| Logical Demolition Ltd | Other services | 2016 |
| Logical Sport Surfacing Ltd | Construction | 2024 |
| Logistics A2B Ltd | Transport & logistics | 2017 |
| Lollipop Pet Care Consulting Ltd | Wholesale & retail | 2020 |
| Londis Newark Limited | Wholesale & retail | 2009 |
| London Parades 2 Limited | Real estate | 2025 |
| London Parades Limited | Construction | 2016 |
| Longedge Property Ltd | Real estate | 2017 |
| Longmead Trading Ltd | Health & social care | 2015 |
| Longtech Ltd | Wholesale & retail | 2026 |
| Lonsdale Australia Limited | Extraterritorial | 2011 |
| Lookose Ltd | Wholesale & retail | 2025 |
| Loose HQ Ltd | Health & social care | 2025 |
| Lorac Limited | Extraterritorial | 2026 |
| Lord Wong Ltd | Real estate | 2022 |
| Lotus Projects Ltd | Professional & scientific | 2007 |
| Lotus Therapy Limited | Health & social care | 2018 |
| LOU Chiu Coaching and Consultancy Ltd | Professional & scientific | 2020 |
| Loui&I Ltd | Wholesale & retail | 2024 |
| Lounge 6TI2 Ltd | Hospitality | 2022 |
| Lounge and Bedroom Ltd | Wholesale & retail | 2020 |
| Lounge Thirteen Ltd | Other services | 2023 |
| Lounge Trieze Limited | Other services | 2026 |
| Love the One | Health & social care | 2009 |
| Love, T Laser Ltd | Other services | 2024 |
| LOW Price Foods Limited | Wholesale & retail | 2017 |
| Lower Longwillows Limited | Households | 2021 |
| LP Property Maintenance Limited | Real estate | 2026 |
| LPO Beauty Ltd | Other services | 2025 |
| LPO Holdings Ltd | Wholesale & retail | 2023 |
| LPP Group Ltd | Arts & recreation | 2023 |
| LPP Palace Ltd | Arts & recreation | 2022 |
| LPP Parties Ltd | Arts & recreation | 2019 |
| LPP Productions Ltd | Arts & recreation | 2018 |
| LR Home Services Limited | Administrative & support | 2025 |
| Lrtf Property Services Ltd | Real estate | 2024 |
| LS Transport Services Ltd | Transport & logistics | 2025 |
| Lshr Consulting Ltd | Professional & scientific | 2021 |
| LSJ Nurture Limited | Professional & scientific | 2020 |
| LT Auto Sales Ltd | Wholesale & retail | 2025 |
| Lubna Edwards Sustainability & Marketing Consultancy Ltd | Professional & scientific | 2024 |
| Lubrisult Ltd | Professional & scientific | 2021 |
| Lucid Data Ltd | Information & communication | 2022 |
| LUCKY16 Ltd | Hospitality | 2021 |
| Lucpro Drylining Ltd | Construction | 2026 |
| Luis Properties Ltd | Real estate | 2019 |
| Luke Snowden Limited | Information & communication | 2019 |
| Lukes & Godwin Limited | Construction | 1999 |
| Lumeah Ltd | Health & social care | 2025 |