| Keykap Ltd | Construction | 2013 |
| Keymer Holdings Limited | Financial services | 2023 |
| Keys for Life Limited | Health & social care | 2024 |
| Keys for Life Operations Limited | Health & social care | 2026 |
| KGB Northampton Limited | Transport & logistics | 2006 |
| Kiesel Properties Limited | Real estate | 2021 |
| Kiez Ltd | Wholesale & retail | 2025 |
| Kilnbridge Developments Limited | Construction | 2002 |
| Kind Path Mentoring Ltd | Education | 2026 |
| Kinetic Sports Group Limited | Education | 2016 |
| Kingdom Five Associates Ltd | Information & communication | 2026 |
| Kings Bromley Wharf Narrowboats Ltd | Manufacturing | 2025 |
| Kings Court Construction Ltd | Construction | 2008 |
| Kings Court Maintenance Ltd | Construction | 2020 |
| Kings Norton Trust Co.,Limited | Extraterritorial | 1942 |
| Kingsley Carpentry Limited | Construction | 2025 |
| Kingstone Consultancy Ltd | Information & communication | 2026 |
| Kinky Sins Ltd | Wholesale & retail | 2017 |
| Kinsav Properties Limited | Real estate | 2018 |
| Kinship Matters Limited | Health & social care | 2018 |
| Kirblu Ltd | Information & communication | 2023 |
| Kirsten Seedhouse Limited | Information & communication | 2016 |
| KIT Prompt Solutions Limited | Professional & scientific | 2021 |
| Kitchen Keen Limited | Wholesale & retail | 2018 |
| Kitchens at 12 Limited | Wholesale & retail | 2014 |
| Kitson Media Management Ltd | Professional & scientific | 2024 |
| KJ Engineering Limited | Professional & scientific | 2022 |
| KJR & Associates Limited | Real estate | 2023 |
| KK Services Ltd | Information & communication | 2015 |
| Kleo Digital Ltd | Professional & scientific | 2019 |
| Klixpay Ltd | Information & communication | 2021 |
| Kljm Services Ltd | Other services | 2025 |
| KLR Consulting Services Ltd | Professional & scientific | 2021 |
| Knights Energy Consultants Ltd | Administrative & support | 2015 |
| Knights Grove (Ashmore Green) Management Company Limited | Households | 2023 |
| Knights Pet Supplies Limited | Wholesale & retail | 2007 |
| Knightsbridge Real Estate Asset Management Limited | Professional & scientific | 2016 |
| Know HOW Services Limited | Professional & scientific | 1998 |
| Koality Limited | Other services | 2021 |
| Kostrzewa Ltd | Manufacturing | 2018 |
| Kpjp Limited | Information & communication | 2011 |
| KR Car Sales Ltd | Wholesale & retail | 2018 |
| KRH Electrical Contractors Ltd | Construction | 2018 |
| KRS Steel Services Limited | Manufacturing | 2015 |
| KS Cleaning Services Ltd | Administrative & support | 2024 |
| KS Land Holdco Limited | Real estate | 2018 |
| KS Landco (Kidderminster) Plot 1 Limited | Real estate | 2025 |
| KS Landco (Kidderminster) Plot 2 Limited | Real estate | 2025 |
| KS Landco 105 Limited | Real estate | 2024 |
| KS Landco 2024 Limited | Real estate | 2024 |
| KS Products Solutions Ltd. | Manufacturing | 2017 |
| KTJ Limited | Professional & scientific | 2023 |
| KTL Consultants Limited | Professional & scientific | 2004 |
| Kudos Hair Fradley Ltd | Other services | 2014 |
| KV Welding Limited | Manufacturing | 2010 |
| KVS Aviation Limited | Other services | 2015 |
| Kwik Travel Ltd. | Administrative & support | 1994 |
| Kyisavior Ltd | Transport & logistics | 2023 |
| Kynvalizith Ltd | Administrative & support | 2023 |
| Kyocera SGS Precision Tools Europe Ltd. | Manufacturing | 2002 |
| L & R Jones Ltd | Real estate | 2022 |
| L Interieur (Wolverhampton) Limited | Real estate | 1958 |
| L Lichfield Limited | Hospitality | 2022 |
| L R Holdings (Lichfield) Limited | Financial services | 2024 |
| L Still Ltd | Health & social care | 2022 |
| L&S International Limited | Construction | 2006 |
| LA Belle VIE Nails and Beauty Ltd | Education | 2018 |
| LA Cantera CIC | Information & communication | 2026 |
| LA Training Academy Ltd | Education | 2025 |
| Lacey Lifting Limited | Arts & recreation | 2024 |
| Lakeside (Barton Marina) Residents Management Company Limited | Households | 2017 |
| Lakin Electrical Services Limited | Construction | 2026 |
| Lamhanson Limited | Manufacturing | 2001 |
| Lamk Limited | Professional & scientific | 2012 |
| Lanakom Ltd | Wholesale & retail | 2020 |
| Lander Group Ltd | Financial services | 2023 |
| Larner Business Services Limited | Professional & scientific | 2010 |
| Larsen Investments Ltd | Financial services | 2026 |
| Lash Daze Limited | Other services | 2023 |
| Laundry & Essentials Limited | Wholesale & retail | 2025 |
| Laura Talbot Photography Ltd | Professional & scientific | 2025 |
| Lauralee Ltd | Hospitality | 2018 |
| Lava Skull Ltd | Information & communication | 2010 |
| Lawndistance Ltd | Administrative & support | 2022 |
| LB Studios Leeds Limited | Other services | 2022 |
| Lbip Limited | Administrative & support | 2018 |
| LCA Academy and Agency Limited | Arts & recreation | 2019 |
| Leadership Mindset Partners Limited | Professional & scientific | 2019 |
| Leamfield Court Management Company Limited | Households | 1986 |
| Leap 76 Group Ltd | Other services | 2018 |
| Learn to Work Ltd | Education | 2015 |
| Leddy's Driving Services Limited | Transport & logistics | 2006 |
| Ledger EWS Limited | Professional & scientific | 2020 |
| LEE Enfield (Guns) Ltd | Wholesale & retail | 2016 |
| LEE Goodwin Plastering Ltd | Construction | 2016 |
| Legal & Financial Planning Ltd | Financial services | 1999 |
| Legionella Management Services Limited | Water & waste | 2017 |
| Legionellasafe Services (UK) Limited | Water & waste | 2017 |
| Lehmann Financial Management Limited | Professional & scientific | 2025 |
| Leicester Modular Housing Ltd | Extraterritorial | 2018 |