| Liberty IFA Ltd | Financial services | 2018 |
| Licoil Ltd | Transport & logistics | 2025 |
| Lifeline Security Ltd | Construction | 2006 |
| Light Company House Ltd | Construction | 2026 |
| Lightlix Trading Ltd | Wholesale & retail | 2023 |
| Ligy Cleaning Ltd | Administrative & support | 2022 |
| Lilly & Co. Ltd | Professional & scientific | 2014 |
| Lima Communications Ltd | Information & communication | 2024 |
| Limbachia Holdings Ltd | Real estate | 2022 |
| Limbachia Properties Ltd | Real estate | 2020 |
| Lime Coaching and Consultancy Limited | Administrative & support | 2012 |
| Limedrop Ltd | Wholesale & retail | 2020 |
| Limitless Youth Football Club CIC | Education | 2023 |
| Limpio Storage Solutions Ltd | Water & waste | 2006 |
| Linch Services Limited | Health & social care | 2011 |
| Lincoln Control Limited | Professional & scientific | 2001 |
| Linda Gilbert Holdings Ltd | Financial services | 2018 |
| Lindisfarne House (Crawley) RTM Company Ltd | Real estate | 2013 |
| Linerlesslabels.Co.Uk Ltd | Wholesale & retail | 2025 |
| Linfield Estates Limited | Real estate | 2016 |
| Lingfield Plant Limited | Administrative & support | 2012 |
| Linkfield Lane Ltd | Real estate | 2021 |
| Linkko Ltd | Professional & scientific | 2010 |
| Linkko Partners Limited | Information & communication | 2013 |
| Linteum Signature Limited | Wholesale & retail | 2025 |
| Linturn Interiors Limited | Construction | 2014 |
| Liro Works Testing Ltd | Construction | 2021 |
| Lita Hand Car Wash Ltd | Wholesale & retail | 2016 |
| Little Barn Owls Limited | Education | 2013 |
| Little Buttercups Ltd | Health & social care | 2024 |
| Little Chompers Ltd | Manufacturing | 2011 |
| Little Frog Media Ltd | Information & communication | 2020 |
| Little Legacy Hotels Ltd | Hospitality | 2025 |
| Little London Dental Care Limited | Health & social care | 2007 |
| Little PAT Ltd | Wholesale & retail | 2024 |
| Little Pink Garden Ltd | Other services | 2024 |
| Little Stars PRE School Ifield Ltd | Health & social care | 2011 |
| Littlefoxes Ltd | Real estate | 2019 |
| Livatm Limited | Information & communication | 2012 |
| Live Wire Cable Jointing Ltd | Construction | 2013 |
| Livefit Sussex CIC | Education | 2025 |
| Llewelyn Davies Enterprises Limited | Real estate | 2018 |
| Lloyds Builders Ltd | Construction | 2024 |
| LMA Recruitment Limited | Administrative & support | 1999 |
| Lmae Ltd | Public administration | 2025 |
| LMB Capital Ltd | Wholesale & retail | 2025 |
| LMC Power Ltd | Professional & scientific | 2024 |
| LMF Coaching Limited | Education | 2024 |
| Lmmr Limited | Construction | 2021 |
| Lmpm Properties Ltd | Real estate | 2019 |
| LN Hand Car Wash Ltd | Wholesale & retail | 2016 |
| LN Window Cleaning Ltd | Administrative & support | 2021 |
| LNA Investments Ltd | Real estate | 2025 |
| LND Holdings UK Ltd | Real estate | 2025 |
| LNG Insights Ltd | Professional & scientific | 2026 |
| Load UP Ltd | Transport & logistics | 2025 |
| Lobitall Trading Limited | Extraterritorial | 2013 |
| Local Accommodation Limited | Hospitality | 2022 |
| Local Grab Ltd | Wholesale & retail | 2020 |
| Lofts Logic Ltd | Construction | 2019 |
| Logdis Coffee Limited | Professional & scientific | 2018 |
| Logenix International Ltd | Transport & logistics | 2017 |
| Logistica Tempestiva Ltd | Transport & logistics | 2024 |
| London & Newmarket Properties Limited | Real estate | 2003 |
| London & Silver Developments LLP | | 2004 |
| London Airports Accessible Rides Ltd | Transport & logistics | 2025 |
| London Basement Construction Ltd | Construction | 2022 |
| London Block Exchange Limited | Financial services | 2020 |
| London Business Coordinators Limited | Professional & scientific | 2023 |
| London CAB Accountants Limited | Professional & scientific | 2015 |
| London College of Professional Education Ltd | Education | 2020 |
| London Cool Limited | Construction | 1994 |
| London Forex Bank Limited | Professional & scientific | 2006 |
| London Garage Doors Limited | Extraterritorial | 1988 |
| London Gatwick Cars Ltd | Transport & logistics | 2007 |
| London Link UP Promotions Ltd | Information & communication | 2019 |
| London Luxe Aesthetics Limited | Health & social care | 2025 |
| London Pinball Ltd | Arts & recreation | 2025 |
| London Point Care Ltd | Health & social care | 2019 |
| London Structural Limited | Construction | 2023 |
| London Talkies UK Ltd | Information & communication | 2021 |
| Lonexa Ltd | Information & communication | 2026 |
| Longhurst Holdings Limited | Real estate | 2023 |
| Longwood Business Support Ltd | Professional & scientific | 2020 |
| Longwood Properties Ltd | Real estate | 2022 |
| Longwood Property Developers Ltd | Construction | 2022 |
| Lookfantastic Training Limited | Education | 2005 |
| Looney-Hoonz Ltd | Extraterritorial | 2025 |
| Lost Art Group CIC | Education | 2025 |
| Lost Garden Studio Ltd | Other services | 2009 |
| Lotus Group 1 Limited | Wholesale & retail | 2023 |
| Lotus Group 11 Limited | Wholesale & retail | 2023 |
| Loud Mouth Promotions Ltd | Arts & recreation | 2019 |
| Loverail.Com Limited | Wholesale & retail | 2015 |
| Lowestoft Dental Care Limited | Health & social care | 2011 |
| Loyalrent & Partners Ltd | Real estate | 2025 |
| LP Electronic Systems Limited | Manufacturing | 2011 |
| LS Care Solutions Ltd | Health & social care | 2022 |
| LS Global Logistics Ltd | Transport & logistics | 2026 |
| LSM Creative Ltd | Professional & scientific | 2024 |