| Khool Property Investments Limited | Real estate | 2025 |
| Khool Solutions Limited | Information & communication | 2025 |
| Kickstart Kidz Limited | Arts & recreation | 2023 |
| Kind Hearts Private Limited | Health & social care | 2017 |
| King Property Finance Ltd | Financial services | 2017 |
| Kingsway Electrical (South East) Ltd | Construction | 2019 |
| Kits Autocare Limited | Wholesale & retail | 2025 |
| Kiwibuild Management Ltd | Construction | 2026 |
| KJP Inc. Limited | Information & communication | 2012 |
| Klix Digital Limited | Administrative & support | 2011 |
| KM Build T/S Decrew Ltd | Construction | 2022 |
| KM Tax Global Ltd | Other services | 2015 |
| Kmala Limited | Hospitality | 2018 |
| KMN Bespoke Services Ltd | Other services | 2023 |
| KMT Baby Classes Ltd | Education | 2015 |
| KMT Toddler Classes Ltd | Education | 2019 |
| KN Tuition Ltd | Education | 2025 |
| Knight Mobile Homes Limited | Manufacturing | 2019 |
| Knowles Homes (Woking) Limited | Construction | 2026 |
| Knox Corporation Limited | Hospitality | 2024 |
| Komfort Interiors Limited | Construction | 1991 |
| Komfort Site Services Limited | Professional & scientific | 1994 |
| Kone Bolton Brady Limited | Extraterritorial | 1992 |
| Kone Lifts Ltd | Professional & scientific | 1919 |
| Kravatt Investment Company Limited | Real estate | 2014 |
| Kristensen Associates Ltd | Financial services | 2006 |
| Krome Technologies Ltd | Information & communication | 2009 |
| Kstone Consulting Ltd | Professional & scientific | 2018 |
| KT Motor Hub Ltd | Wholesale & retail | 2025 |
| KT16 Limited | Construction | 2019 |
| KT16 Restaurant Limited | Hospitality | 2025 |
| Kuber Finance Company Ltd | Construction | 2022 |
| Kundalini Records U.K Limited | Information & communication | 2009 |
| Kutosha Ltd | Education | 2024 |
| Kwikclear Drains Limited | Water & waste | 2020 |
| L & T Combustion Ltd | Manufacturing | 2014 |
| L&N Beauty Spa Ltd | Other services | 2024 |
| LA Car Wash Ltd | Wholesale & retail | 2019 |
| LAC Unique Limited | Arts & recreation | 2006 |
| Ladies First Chauffeurs Limited | Transport & logistics | 2025 |
| Lampton Cleaners Limited | Other services | 1977 |
| LAN Jian Food Limited | Hospitality | 2006 |
| Larden Road Management Limited | Real estate | 2011 |
| Lark Hill (Oxford) Limited | Construction | 2022 |
| Laurel Real Estate Limited | Real estate | 2014 |
| LCD Design & Building Ltd | Construction | 2024 |
| LCD Property Investments Ltd | Real estate | 2025 |
| Lead Medix Limited | Education | 2026 |
| Leadership Conferences UK Ltd | Extraterritorial | 2026 |
| Leah Durrant Ltd | Other services | 2010 |
| Leegdevelopments Ltd | Information & communication | 2020 |
| Legal Road Limited | Information & communication | 2010 |
| Legend Windows Ltd | Construction | 2021 |
| Legends Publishing Ltd | Other services | 2022 |
| Leigh Linton Ltd | Wholesale & retail | 2023 |
| Leightonbrown Limited | Professional & scientific | 2010 |
| Leila Real Estate Limited | Real estate | 2021 |
| Lektrodesigns Limited | Manufacturing | 1977 |
| Lemon Enterprises Limited | Information & communication | 2016 |
| Leonard Fusion Fitness Ltd | Other services | 2022 |
| LET Go Learning Limited | Professional & scientific | 2010 |
| Letch Properties Limited | Real estate | 2017 |
| Letistitch Ltd | Wholesale & retail | 2019 |
| Letort Limited | Professional & scientific | 2024 |
| Level X Limited | Wholesale & retail | 2015 |
| Lewis Maintenance Services Ltd. | Construction | 2017 |
| Lewis Plumbing Supplies Ltd. | Wholesale & retail | 2017 |
| Liberty Express Limited | Transport & logistics | 2010 |
| Licorf Ltd | Real estate | 2025 |
| Life Force Field Ltd | Other services | 2023 |
| Lifesciencesupport Limited | Professional & scientific | 2021 |
| Liiamra Consultancy Limited | Professional & scientific | 2022 |
| Likenbuy Ltd | Wholesale & retail | 2021 |
| Lilia Smile Clinic Ltd | Health & social care | 2026 |
| Lilyrosa Limited | Wholesale & retail | 2011 |
| Limesquare Business Parks Limited | Construction | 1984 |
| Limesquare Developments Limited | Professional & scientific | 2005 |
| Limesquare Finance Limited | Administrative & support | 1990 |
| Limesquare Holdings Limited | Professional & scientific | 1974 |
| Limesquare Investments Limited | Professional & scientific | 2005 |
| Limesquare Limited | Professional & scientific | 2005 |
| Limesquare Property Newco Limited | Professional & scientific | 2024 |
| Limesquare Trade Topco Limited | Professional & scientific | 2024 |
| Limesquare Vehicle Rental Limited | Administrative & support | 2003 |
| Limpopo Biltong Limited | Manufacturing | 2017 |
| Lincoln Electric Finance LP | | 2006 |
| Lincs Sparkling Cleaning Services Limited | Administrative & support | 2025 |
| Link Detailing Limited | Professional & scientific | 2020 |
| Link Freight Limited | Transport & logistics | 2024 |
| Little Italy Ltd | Hospitality | 2018 |
| Little Lane Carpentry Ltd | Construction | 2021 |
| LJL Transport Limited | Transport & logistics | 1999 |
| LM Incorporated Limited | Information & communication | 2024 |
| Lmdp Limited | Administrative & support | 2018 |
| LMH Wellness Ltd | Health & social care | 2023 |
| Load & Shoot Ltd | Transport & logistics | 2025 |
| Loca Cars Limited | Wholesale & retail | 2024 |
| Locate Retail Limited | Administrative & support | 2013 |
| Locomocean Design Limited | Manufacturing | 2026 |
| Locum Vision Ltd | Information & communication | 2011 |