| Knighton Mill Pottery Ltd | Arts & recreation | 2015 |
| Knightprint Limited | Manufacturing | 2007 |
| Knightsgate Construction Limited | Construction | 2012 |
| Knightwood Leisure (DOY) Ltd | Hospitality | 2025 |
| Knightwood Leisure Limited | Hospitality | 1996 |
| Knole Estate Trustee Company Limited | Extraterritorial | 2005 |
| Kochwerk Ltd | Wholesale & retail | 2011 |
| Kofcomps Ltd | Arts & recreation | 2021 |
| Kohana Consulting Limited | Professional & scientific | 2009 |
| Kokoro Plus Limited | Hospitality | 2015 |
| Kompass (Tonbridge) Management Company Limited | Households | 2013 |
| Kong Company Limited | Transport & logistics | 2007 |
| Konnsult Lifesciences Limited | Professional & scientific | 2018 |
| Koodoo Holdings Limited | Financial services | 2024 |
| Koodoo Limited | Administrative & support | 2009 |
| Koru AUN Holdings Ltd | Real estate | 2025 |
| Kosmos Bakery Limited | Hospitality | 2019 |
| Kovobel UK Ltd | Extraterritorial | 2019 |
| KP Safety Solutions Limited | Administrative & support | 2013 |
| KP2 Telemedia Limited | Information & communication | 2021 |
| Krinkle Flat Management Limited | Households | 2001 |
| Krivski Associates Limited | Health & social care | 2017 |
| Kruszelnicki Leetch Architects Limited | Professional & scientific | 2014 |
| Krysalis Consultancy Ltd | Health & social care | 2015 |
| Kryten Konsulting LLP | | 2011 |
| KS Commercial's Salisbury Ltd | Wholesale & retail | 2022 |
| Ksaestheticssalisbury Limited | Health & social care | 2020 |
| Ktech Repairs Ltd | Other services | 2026 |
| Kudu Construction Ltd | Construction | 2026 |
| Kuma Consulting Limited | Professional & scientific | 2016 |
| Kupatyno Ltd | Health & social care | 2026 |
| Kurdish Donner Ltd | Hospitality | 2025 |
| KV Metal Products Limited | Manufacturing | 2013 |
| KVF Consultants Ltd | Professional & scientific | 2012 |
| Kvfhd Ltd | Professional & scientific | 2025 |
| KW Invest Limited | Real estate | 2024 |
| Kynance (Marlborough) Management Company Limited | Households | 2004 |
| Kyor Consulting Limited | Administrative & support | 2017 |
| KZD Ltd | Health & social care | 2025 |
| L & B Timber Buildings and Construction Ltd | Manufacturing | 2017 |
| L & S Alappat Properties Ltd | Real estate | 2024 |
| L a Edwardes Ltd | Professional & scientific | 2019 |
| L C Power Limited | Construction | 1999 |
| L Carter Foot Care Limited | Health & social care | 2021 |
| L J F Carpentry & Design Ltd | Construction | 2017 |
| L K Ninnim Engineering Limited | Construction | 2001 |
| L R Fire Safety Ltd | Administrative & support | 2024 |
| L Walker Electrical Services Limited | Construction | 2017 |
| L&M Installing Limited | Construction | 2008 |
| L'Agence Anglaise Ltd | Agriculture & fishing | 2014 |
| L.J.White Transport Ltd | Transport & logistics | 2021 |
| L.S.Dixon Group Limited | Professional & scientific | 1894 |
| L1 Electrical & Security Ltd | Construction | 2021 |
| LA Boulangerie DES Gourmets UK Ltd | Wholesale & retail | 2019 |
| LA Cergne Limited | Professional & scientific | 2014 |
| LA Folia Music | Arts & recreation | 2007 |
| LA Parisienne Romsey Ltd | Hospitality | 2020 |
| LA Total Plumbing Ltd | Construction | 2018 |
| Labelcraft Limited | Manufacturing | 2010 |
| Labelcraft UK Limited | Manufacturing | 1994 |
| Labour Supplies Southern Limited | Administrative & support | 2023 |
| Lailey Builders Ltd | Construction | 2017 |
| Lake Trustees (NO 1) Limited | Extraterritorial | 2024 |
| Lake Trustees (NO 2) Limited | Extraterritorial | 2024 |
| Lakewood Carpentry Limited | Construction | 2022 |
| Lamb Precision Engineering Limited | Professional & scientific | 2002 |
| Lamb Services Limited | Professional & scientific | 1998 |
| Lambda Logic Limited | Information & communication | 1995 |
| Lambourn Equine Salt Therapy Limited | Administrative & support | 2018 |
| Lamerth Limited | Wholesale & retail | 2020 |
| Lamerton Lodge (Freehold) Limited | Households | 1996 |
| Lamerton Lodge Management Company Limited | Households | 1988 |
| Lancaster Land Limited | Construction | 2021 |
| Lancaster Pharmaqual Limited | Professional & scientific | 2006 |
| Lancol Properties Limited | Real estate | 2001 |
| Land and Engineering Services UK Limited | Construction | 2007 |
| Land Butcher Investco Limited | Financial services | 2023 |
| Land Butcher Ltd | Financial services | 2022 |
| Land Butcher Midco Limited | Financial services | 2023 |
| Land Development Services Limited | Professional & scientific | 2001 |
| Land Lifestyle Limited | Wholesale & retail | 2018 |
| Land Options Limited | Construction | 2007 |
| Land Rover Series I, II, III Club Ltd | Other services | 2025 |
| Land USE Strategy Ltd | Professional & scientific | 2006 |
| Landford Architectural Services Ltd | Professional & scientific | 2007 |
| Landford Estate Properties Ltd | Real estate | 2026 |
| Landford Garage Limited | Wholesale & retail | 1997 |
| Landford Manor Ltd. | Real estate | 2003 |
| Landford Stone (Holdings) Ltd | Financial services | 2020 |
| Landford Stone Limited | Manufacturing | 1992 |
| Landford Trees Limited | Agriculture & fishing | 2020 |
| Landhurst Investments Limited | Construction | 2016 |
| Landlordsafetychecks.Com Limited | Extraterritorial | 2013 |
| Landocean Ltd | Construction | 2017 |
| Landon Marketing and Design Ltd | Information & communication | 2015 |
| Landwise Rural Resource Management Limited | Professional & scientific | 2011 |
| Langdown Civil Engineering Ltd | Construction | 2024 |
| Langdown Properties Limited | Real estate | 2005 |
| Langleaves Ltd | Administrative & support | 2020 |
| Langleaves Tree Surgery & Consultancy Limited | Administrative & support | 2022 |