| Linea Classics (UK) Limited | Manufacturing | 2003 |
| Linescape Limited | Manufacturing | 2021 |
| Linevage Ltd | Real estate | 2022 |
| Lingy Moor Farming Ltd | Agriculture & fishing | 2013 |
| Link Asset Finance Limited | Financial services | 2019 |
| Lion LIV Ltd | Real estate | 2020 |
| Lion Restoration Ltd | Construction | 2022 |
| Liquid Consultants Limited | Professional & scientific | 2013 |
| Liquid Gold Products Limited | Manufacturing | 2012 |
| Liquidation Fashion Ltd | Wholesale & retail | 2021 |
| Liquorice Ltd | Information & communication | 2014 |
| Lisa Beauty Boutique Limited | Other services | 2024 |
| Lisa King Designs Ltd | Professional & scientific | 2015 |
| Lisa Lalani Interiors Ltd | Professional & scientific | 2024 |
| Lisa's Catering Company Ltd | Administrative & support | 2026 |
| Lishan Ltd | Hospitality | 2023 |
| Little Learners Nursery Centre Limited | Education | 1998 |
| Little Steps Forward Ltd | Information & communication | 2025 |
| LIV & Ivory Ltd | Wholesale & retail | 2025 |
| Live Brew Company Ltd | Manufacturing | 2018 |
| Live Media Management Ltd | Information & communication | 2013 |
| Live Wanda Ltd | Other services | 2018 |
| Livin Structures Ltd | Construction | 2026 |
| Living in Magazines Limited | Information & communication | 2014 |
| LJC Limited | Construction | 2002 |
| Ljkirk Ltd | Health & social care | 2016 |
| LK Therapies Limited | Health & social care | 2020 |
| Llama Logic Ltd | Information & communication | 2017 |
| Llldesign Ltd | Administrative & support | 2019 |
| LM Marine Ltd | Wholesale & retail | 2026 |
| LM MSK Limited | Health & social care | 2020 |
| LM Real Estate Investments Ltd | Real estate | 2025 |
| LMD Properties (U.K) Limited | Real estate | 2024 |
| Lmtm Ltd | Construction | 2024 |
| LMV Insight Ltd | Professional & scientific | 2020 |
| LNS Investments Limited | Financial services | 2024 |
| Local Home Information Packs (HIP) Limited | Real estate | 2006 |
| Locate UK Limited | Real estate | 2007 |
| Location Live Limited | Information & communication | 2012 |
| Location London Properties LLP | | 2004 |
| Lochay Investments Limited | Real estate | 2021 |
| Lock Property Limited | Real estate | 2013 |
| Locksmeade Owners Ltd | Administrative & support | 1981 |
| Lodge (KEW Gardens) Residents Company Limited(The) | Households | 1964 |
| Loenberg AR Limited | Professional & scientific | 2004 |
| Loga Properties Limited | Construction | 2018 |
| Logiptimal Ltd | Professional & scientific | 2021 |
| Loloflights.Co.Uk Limited | Administrative & support | 2013 |
| London Extension Company Limited | Construction | 2005 |
| London Garden (SJS) Limited | Other services | 2016 |
| London Glam Squad Ltd | Other services | 2024 |
| London Gutter Clean Ltd | Administrative & support | 2020 |
| London Health Systems Ltd | Professional & scientific | 2017 |
| London Multimedia Services Ltd | Wholesale & retail | 2014 |
| London ROC Capital Limited | Construction | 2017 |
| London Scottish International Limited | Administrative & support | 2008 |
| London Teddy Bears Ltd | Manufacturing | 2014 |
| London Tideway Ltd | Arts & recreation | 2020 |
| London Welsh RFC Commercial Limited | Arts & recreation | 2017 |
| London Welsh RFC Limited | Arts & recreation | 2004 |
| London Wise Ltd | Wholesale & retail | 2016 |
| Long Green Farm Limited | Agriculture & fishing | 2018 |
| Long Weight Developers Ltd | Information & communication | 2025 |
| Longevity X Ltd | Information & communication | 2026 |
| Longshot Ventures Ltd | Administrative & support | 2009 |
| Lonsdale 1L Limited | Administrative & support | 1998 |
| Looks Bold Ltd | Wholesale & retail | 2024 |
| Loop Horizon Limited | Professional & scientific | 2018 |
| Lordsmith Financial Ltd | Administrative & support | 2024 |
| Lostock Junction Limited | Professional & scientific | 2006 |
| Lothbury Ventures Limited | Professional & scientific | 1993 |
| Lotus Silverstone Ltd | Financial services | 2024 |
| Lotuschart Limited | Households | 1985 |
| Louise Wiles & Associates Limited | Professional & scientific | 2013 |
| Love MIA Nails and Beauty Ltd | Other services | 2026 |
| Love Property UK Ltd | Real estate | 2008 |
| Love Tomorrow Limited | Information & communication | 2010 |
| LOW Grange Quarry Limited | Administrative & support | 2003 |
| LOW Impact Forestry Limited | Agriculture & fishing | 2019 |
| LOW Pastures Residents Company Limited | Households | 1990 |
| Lowden Court Maintenance Limited | Households | 1987 |
| Lowden International Limited | Professional & scientific | 1998 |
| Lowenthwaite Builders Ltd | Construction | 2020 |
| Lower Lodge 411 Limited | Real estate | 2025 |
| Lower Richmond Properties Limited | Hospitality | 2002 |
| Lowood Holdings (CRE1) Ltd | Real estate | 2026 |
| Lowood Holdings Ltd | Real estate | 2022 |
| Lowood Limited | Administrative & support | 2023 |
| LPJ Building Consultants Ltd | Construction | 2023 |
| Lroc (Pavement) Limited | Real estate | 2018 |
| Lroc (Richmond) Limited | Real estate | 2020 |
| Lroc (SM) Limited | Real estate | 2019 |
| Lroc Holdings Limited | Financial services | 2020 |
| LRP Asset Management Limited | Hospitality | 2019 |
| LRP Global Limited | Real estate | 2019 |
| LS Heating Solutions Ltd | Construction | 2022 |
| LS Lions RFC Limited | Arts & recreation | 2020 |
| LTC Property Investment Ltd | Real estate | 2025 |
| Lucky Cat Trading Limited | Wholesale & retail | 2026 |
| Lucky Life Ltd | Other services | 2023 |