| Krhemoa Ltd | Real estate | 2018 |
| Krome Limited | Professional & scientific | 1998 |
| KSC Worldwide Ltd | Wholesale & retail | 2010 |
| KTD Holdings Ltd | Transport & logistics | 2025 |
| Kubeflex Limited | Information & communication | 2024 |
| Kulo Property Investment (UK) Ltd | Real estate | 2015 |
| KVK Prrofessionals Limited | Extraterritorial | 2014 |
| L'Orto Limited | Real estate | 2013 |
| L, L & Faith Ltd | Real estate | 2019 |
| L.A. Real Estate Ltd | Extraterritorial | 2016 |
| L.B Production Lighting Limited | Construction | 2024 |
| L1 Associates Ltd | Information & communication | 2000 |
| Labfull Flat Management Company Limited | Households | 1979 |
| Ladybird Lane Nursery Limited | Education | 2022 |
| Lagana Catering Ltd | Hospitality | 2026 |
| Laliberte Ltd | Extraterritorial | 2019 |
| Lamb Media Limited | Information & communication | 2009 |
| Lamiflex Ltd | Wholesale & retail | 1980 |
| Lampshade Productions Ltd | Information & communication | 2012 |
| Landscape Artisan Ltd | Administrative & support | 2018 |
| Langham House Estate Maintenance Company Limited | Households | 1957 |
| Langst Ltd | Administrative & support | 2014 |
| Larkbrace Limited | Hospitality | 1986 |
| Larkstone Properties Limited | Real estate | 1994 |
| Laura Howard Copywriter Ltd | Professional & scientific | 2020 |
| Lavender Lane Pre-School CIC | Health & social care | 2022 |
| Lawrence Walsh Ltd. | Manufacturing | 1994 |
| Layers of Light Ltd | Professional & scientific | 2025 |
| LCA International Couriers Limited | Transport & logistics | 1998 |
| Lefe Properties Ltd | Real estate | 2019 |
| LEGACY4FUTURE Ltd | Real estate | 2019 |
| Lehar Enterprise Ltd | Real estate | 2015 |
| Leisure Catalyst Limited | Professional & scientific | 2009 |
| LEJ Landscaping & Groundworks Ltd | Construction | 2022 |
| Lelo Gvulot Ltd | Real estate | 2019 |
| Lemm Properties Limited | Real estate | 2020 |
| LEO Ever Stock Limited | Wholesale & retail | 2024 |
| Leonardos Caffe Limited | Hospitality | 2023 |
| Lepos Melrose Ltd | Professional & scientific | 2020 |
| Level UP Properties Ltd | Real estate | 2017 |
| Lewes Fine Art Limited | Other services | 2010 |
| Lewis-Jones Properties Ltd | Real estate | 2018 |
| LEX International Property Ltd | Extraterritorial | 2018 |
| Liberation Finance Ltd | Extraterritorial | 2019 |
| Lightbio Limited | Professional & scientific | 2019 |
| Lights and Sound Limited | Arts & recreation | 2023 |
| Lightstone Holdings Ltd | Real estate | 2023 |
| Lightup London Holding Limited | Wholesale & retail | 2025 |
| Lihua Ltd | Information & communication | 2024 |
| Lime Tree Court Freehold Limited | Households | 1998 |
| Lime Tree Management (Croydon) Limited | Households | 1996 |
| Limia Investments Ltd | Real estate | 2020 |
| Lin's Properties Limited | Real estate | 2017 |
| Lincoln Court (Hampton) Freehold Limited | Households | 2024 |
| Linden Hall Community Centre Limited | Health & social care | 2010 |
| Link Construction and Engineering Ltd. | Construction | 2014 |
| Link Professionals Ltd | Other services | 2018 |
| Linksview Court Ltd | Households | 2017 |
| Linton Electric Ltd | Construction | 2016 |
| Lion Property Holdings Ltd | Real estate | 2017 |
| Liquid Interiors London Ltd | Real estate | 2017 |
| Lise London Limited | Professional & scientific | 2013 |
| Literacy Works Ltd | Education | 2013 |
| Little Bears Playcafe Ltd | Hospitality | 2024 |
| Livelybuy Ltd | Wholesale & retail | 2017 |
| Livelyfactory Limited | Hospitality | 2025 |
| Livemill Ltd | Real estate | 2019 |
| Lizh Limited | Extraterritorial | 2021 |
| LLS Estates Limited | Real estate | 2011 |
| LOB Consulting Limited | Administrative & support | 2025 |
| Loders Properties Limited | Real estate | 1989 |
| Lodge Hotels (London) Limited | Hospitality | 1960 |
| Lola Morgan Beauty and Aesthetics Ltd | Other services | 2024 |
| London Blue Sky Ltd | Manufacturing | 2019 |
| London Coco Ltd | Wholesale & retail | 2020 |
| London Digital Assets Limited | Professional & scientific | 2026 |
| London Land and Construction Ltd | Construction | 2022 |
| London Mews Lofts Limited | Real estate | 2009 |
| London Mini Limited | Wholesale & retail | 2021 |
| Londonstore Limited | Wholesale & retail | 2011 |
| Londontree Education Limited | Education | 2022 |
| Long Elms Motors Ltd | Wholesale & retail | 2025 |
| Longford Mews Management Company Limited | Households | 2019 |
| Lothian Thirty One UK Ltd | Real estate | 2017 |
| Loud & Clear Technology Ltd | Information & communication | 2024 |
| Lourdes Transport Ltd | Transport & logistics | 2024 |
| Love 4 Lighting Limited | Wholesale & retail | 2012 |
| Love Knot Ltd | Arts & recreation | 2025 |
| Lowdec Ltd | Extraterritorial | 2018 |
| LRV Management Limited | Households | 2000 |
| LS Contractors Ltd | Construction | 2023 |
| LSA Housing Ltd | Real estate | 2019 |
| Lucent Insights Ltd | Professional & scientific | 2024 |
| Luke Farrow Limited | Information & communication | 2015 |
| Luke Humphries Dart Promotions Limited | Arts & recreation | 2017 |
| Luminara Living Ltd | Real estate | 2025 |
| Luminaxis Consulting Limited | Professional & scientific | 2025 |
| Luminopex Limited | Administrative & support | 2016 |
| Lumnicleanse Ltd | Wholesale & retail | 2020 |
| Lunessence Ltd | Professional & scientific | 2025 |