| KFK Lettings Limited | Real estate | 2018 |
| KFL Developments Limited | Real estate | 2015 |
| KFX4 Limited | Administrative & support | 2022 |
| KH Pharma Solutions Ltd | Administrative & support | 2016 |
| Khotston Pilates Limited | Arts & recreation | 2025 |
| Kieran Doorga Ltd | Wholesale & retail | 2013 |
| KILO7 Ltd | Real estate | 2021 |
| Kimble's END Limited | Real estate | 2025 |
| Kindred Estates Limited | Real estate | 2023 |
| Kingstons Construction Ltd | Construction | 2012 |
| Kintsugi Rose Properties Limited | Real estate | 2025 |
| Kitsmead Investments Limited | Real estate | 2020 |
| Kitsmead Trading Company Limited | Professional & scientific | 2025 |
| Kitts Scaffolding Limited | Construction | 1997 |
| KJ HYG Ltd | Health & social care | 2022 |
| KJL Trade Ltd | Wholesale & retail | 2020 |
| Kleos Groups Limited | Real estate | 2022 |
| KNF Engineering Ltd | Construction | 2020 |
| Knowing London Limited | Construction | 2015 |
| Knowsley Consulting Limited | Administrative & support | 2020 |
| Kokoro Associates Limited | Professional & scientific | 2023 |
| Kola Developments Limited | Real estate | 2015 |
| Kooringa Estate Management Limited | Other services | 1970 |
| KP Venture Group Ltd | Professional & scientific | 2026 |
| KPH De-Construction Services Ltd | Construction | 2007 |
| KPH Group Limited | Financial services | 2015 |
| Kph-I Limited | Other services | 2020 |
| Krish VD Properties Limited | Real estate | 2020 |
| KSO Property Investments Limited | Real estate | 2023 |
| KT Finishers Ltd | Construction | 2024 |
| Kynaston Court Residents Association Limited | Households | 2004 |
| Kytto Ltd | Professional & scientific | 2025 |
| L & M Products Limited | Manufacturing | 2002 |
| L Fisher Flooring Ltd | Construction | 2012 |
| L Fisher Ltd | Information & communication | 2023 |
| L Vinten Brickwork Limited | Construction | 2018 |
| Ladlaw Limited | Real estate | 2001 |
| Lake Publishing Limited | Information & communication | 2019 |
| Lancelot Property Group Ltd | Real estate | 2022 |
| Landpro Contractors Ltd | Administrative & support | 2016 |
| Lands Building Solutions Ltd | Construction | 2009 |
| Laneford Limited | Extraterritorial | 2010 |
| Langham Trinity Close Company Limited | Real estate | 2009 |
| Lansdowne (South) Management Company Limited | Households | 2009 |
| Lanternmere Ltd | Real estate | 2026 |
| Lara EVA Ltd | Professional & scientific | 2025 |
| Largerinc Ltd | Real estate | 2020 |
| Laroo Ltd | Real estate | 2021 |
| Lauranda Accountancy Limited | Professional & scientific | 2009 |
| Lawrence Addison Limited | Professional & scientific | 2012 |
| Laybros Limited | Households | 2021 |
| LD Kent ROW Ltd | Hospitality | 2015 |
| Leafy Tree Property Investments Limited | Real estate | 2022 |
| Ledco (Norbury) Limited | Administrative & support | 2021 |
| Ledco Holdings Limited | Financial services | 2020 |
| LEE Ryan Construction Ltd | Construction | 2016 |
| Lehane & MAY Developments Ltd | Real estate | 2023 |
| Leigh Dynan Catering Limited | Hospitality | 2010 |
| Lemaxie Limited | Health & social care | 2019 |
| Lensam Solutions LLP | | 2014 |
| Leorey Consulting Limited | Professional & scientific | 2026 |
| Lerf Ltd | Administrative & support | 2010 |
| LET Property Ltd | Real estate | 2025 |
| Letterpart Limited | Information & communication | 1991 |
| Lewis and Bayliss Limited | Professional & scientific | 2024 |
| Lexatrom Ltd | Financial services | 2020 |
| Lfir Marketing Ltd | Professional & scientific | 2026 |
| LGM Christie Ltd | Real estate | 2025 |
| Libra Incorporation Ltd | Transport & logistics | 2021 |
| Life Publications (Nottinghamshire) Ltd | Information & communication | 2018 |
| Light Media Ltd | Extraterritorial | 2007 |
| Lignum Vitae Ltd | Manufacturing | 2022 |
| Like Mortgage Advice Ltd | Financial services | 2019 |
| Lilly’S Nails & Beauty Ltd | Other services | 2025 |
| Lily Rose Wellbeing Ltd | Education | 2024 |
| Lime Estates Limited | Real estate | 2012 |
| Lime RAM Consulting Limited | Professional & scientific | 2024 |
| Lime Tree Farm (Glassenbury) Limited | Real estate | 2019 |
| Limelight Solutions Limited | Professional & scientific | 2021 |
| Limestone Corporation Ltd | Manufacturing | 2026 |
| Limpsfield Close Management Company Limited | Administrative & support | 2016 |
| Lincroft & Company Limited | Professional & scientific | 2002 |
| Linden Drive Management Company Limited | Households | 2006 |
| Linked UP Ltd | Wholesale & retail | 2018 |
| Linton Residents Association Limited | Households | 1978 |
| Liquid Clouds Ltd | Wholesale & retail | 2016 |
| Liquid Interactive Design Limited | Professional & scientific | 2008 |
| LIS Media Limited | Administrative & support | 2020 |
| Lisle Close (59-70) Freehold Company Limited | Households | 2013 |
| Litchfield Property Solutions Ltd | Real estate | 2025 |
| Literary Allsorts Ltd | Information & communication | 2002 |
| Littleacre Property Investments Ltd | Financial services | 2022 |
| Livestrata Burrswood Ltd | Real estate | 2020 |
| Livestrata Portland Road Ltd | Real estate | 2021 |
| Livestrata Sutton Ltd | Real estate | 2021 |
| Livingwell Therapy Ltd | Professional & scientific | 2021 |
| LJL Shopper Ltd | Wholesale & retail | 2025 |
| Ljpl Ltd | Real estate | 2020 |
| LK Productions Limited | Information & communication | 2011 |
| Lloyds School of Motoring Ltd | Education | 2010 |