| London School of Technology and Management Ltd | Education | 2022 |
| London Service Call Limited | Administrative & support | 1996 |
| London Tech LAB Ltd | Information & communication | 2020 |
| London Transport Limited | Manufacturing | 2022 |
| Lone Wolf Drive Ltd | Transport & logistics | 2019 |
| Lonely Monster Ltd | Information & communication | 2017 |
| Long & Petite Ltd | Manufacturing | 2025 |
| Long Acre (Lower END) Management Company Limited | Households | 2021 |
| Long QI Ltd | Wholesale & retail | 2021 |
| Longs Inn Limited | Hospitality | 2022 |
| Longwell Investments Ltd | Administrative & support | 2017 |
| Longwell Mailbox Ltd | Wholesale & retail | 2017 |
| Look Sharp Stony Ltd | Administrative & support | 2018 |
| LOOK4 Global Business Ltd | Wholesale & retail | 2025 |
| Loom & Compass Ltd | Professional & scientific | 2026 |
| Loop 3D Additive Manufacturing Ltd | Manufacturing | 2024 |
| Loop Free IT Ltd | Information & communication | 2012 |
| Loopluxe Traders Ltd | Wholesale & retail | 2025 |
| Loose Rivet Aviation Limited | Manufacturing | 2023 |
| Lord of Lord's Ltd | Wholesale & retail | 2021 |
| Lord Tresise Ltd | Health & social care | 2018 |
| Lord Tresise Property Limited | Real estate | 2025 |
| Lord's Management Limited | Real estate | 2020 |
| Lorenzo Consultancy Limited | Wholesale & retail | 2025 |
| Lorenzzo Ltd | Transport & logistics | 2024 |
| Lormac Administrator Limited | Transport & logistics | 2015 |
| Lost Access Ltd | Wholesale & retail | 2025 |
| Lost Art Logic Limited | Information & communication | 2005 |
| LOT 61 Ltd | Hospitality | 2026 |
| Lotgistics Limited | Transport & logistics | 2019 |
| Lots of Bugs Studios Ltd | Information & communication | 2026 |
| Lotus Research Ltd | Professional & scientific | 2013 |
| Lotus Solutions Ltd | Information & communication | 2010 |
| Louch Shacklock and Partners LLP | | 2012 |
| Loughborough Town Properties 2 Limited | Real estate | 2020 |
| Loughborough Town Properties Limited | Real estate | 2020 |
| Loughran Materials Limited | Wholesale & retail | 2025 |
| Loughton Grove Montessori Ltd | Education | 2026 |
| Loughton Lake Ltd | Hospitality | 2019 |
| Loughton School | Education | 2013 |
| Louis Marks & Co Limited | Professional & scientific | 2019 |
| Louisa Keating Design Limited | Professional & scientific | 2019 |
| Louise Gordon Consultancy Limited | Professional & scientific | 2013 |
| Loumie Limited | Financial services | 2023 |
| Lounge India Bucks Ltd | Hospitality | 2021 |
| Lovat Mead Residents Company Limited | Households | 1989 |
| Love & Dias Cleaning Services Limited | Administrative & support | 2024 |
| Love and Faith International Limited | Wholesale & retail | 2019 |
| Love and Loved Ltd | Wholesale & retail | 2021 |
| Love Curry Limited | Hospitality | 2023 |
| Love Golf Holidays Limited | Administrative & support | 2025 |
| Love IS UN- Ltd | Hospitality | 2026 |
| Love Local Hub Community Interest Company | Wholesale & retail | 2020 |
| Love Nutrition Ltd | Wholesale & retail | 2026 |
| Love Red Label Limited | Manufacturing | 2014 |
| Love to Brew Limited | Wholesale & retail | 2022 |
| Love-One & SON Limited | Transport & logistics | 2024 |
| Lovehatedo Fitness Limited | Arts & recreation | 2025 |
| Lovenkjaer Holdings Ltd | Administrative & support | 2018 |
| Lovers Agency Limited | Professional & scientific | 2014 |
| Lovers International Limited | Administrative & support | 2017 |
| Lovililo Properties Ltd | Households | 2024 |
| Loving Presence Therapy Ltd | Health & social care | 2023 |
| LOW FAT Media Limited | Extraterritorial | 2017 |
| Lowa Ltd | Financial services | 2018 |
| Lowe Cost Home Improvements Limited | Construction | 2022 |
| Lowe PA Limited | Public administration | 2020 |
| Loxley Services Limited | Construction | 2022 |
| Loyalty Care Group Ltd | Health & social care | 2022 |
| Loyola Tech Limited | Information & communication | 2024 |
| Lozsoft Limited | Information & communication | 2007 |
| LP Advertising Services Limited | Professional & scientific | 2015 |
| LPA Consulting Services Limited | Information & communication | 2003 |
| Lpgl Ventures Ltd | Arts & recreation | 2014 |
| LPK Properties Limited | Real estate | 2022 |
| Lpkp Consulting Limited | Professional & scientific | 2024 |
| LPS Builders Limited | Other services | 2007 |
| Lpuk Limited | Professional & scientific | 2025 |
| LQP Holdings Limited | Financial services | 2017 |
| LR (UK) Limited | Construction | 2007 |
| LR Builders Ltd | Administrative & support | 2016 |
| LR Mobile Service Tech Ltd | Wholesale & retail | 2025 |
| LR Strategic Ltd | Administrative & support | 2026 |
| Lrjnch Limited | Real estate | 2020 |
| LRP Lucidity Ltd | Professional & scientific | 2025 |
| LRP Properties & Lettings Ltd | Real estate | 2026 |
| LS International Consulting Limited | Professional & scientific | 2025 |
| LS Trades & Maintenance Ltd | Administrative & support | 2014 |
| LSA Composites Ltd | Wholesale & retail | 2025 |
| LSA Contracting Ltd | Construction | 2021 |
| Lscampit Limited | Construction | 2019 |
| Lsd-K Ltd | Administrative & support | 2018 |
| LSM Cleaning Services Ltd | Administrative & support | 2019 |
| LSP Specialist Eco Cleaning Ltd | Wholesale & retail | 2022 |
| LSR Electrical Limited | Construction | 2009 |
| LSS Beauty and Aesthetics Ltd | Other services | 2022 |
| LSS HGV Services Ltd | Transport & logistics | 2025 |
| LSS Legal Ltd | Financial services | 2018 |
| LSS Property Rentals Ltd | Real estate | 2025 |
| LST Consulting Ltd | Professional & scientific | 2016 |