| Keith Palmer Associates Limited | Professional & scientific | 2000 |
| Kelvestone House RTM Company Limited | Households | 2019 |
| Kemberton Investments Ltd | Administrative & support | 2021 |
| KEN Co Ltd | Extraterritorial | 2023 |
| Kenco Properties Limited | Real estate | 2022 |
| Kendess Ltd | Transport & logistics | 2024 |
| Kenect Recruitment (Resourcing) Limited | Administrative & support | 2021 |
| Kenilworth Court (Cannock) Management Company Limited(The) | Real estate | 1982 |
| Kenilworth Court Freehold Limited | Real estate | 2016 |
| Kenson Industrial Plastics Limited | Manufacturing | 1979 |
| Ketland Builders Limited | Construction | 2004 |
| KEV Abley Installation and Maintenance Limited | Construction | 2017 |
| Kevelo Services Limited | Other services | 2013 |
| Keylocksupplies Ltd | Wholesale & retail | 2018 |
| Keystone Granite & Memorials Ltd | Other services | 2017 |
| KG Egginton Properties Limited | Households | 2024 |
| Kibble Property Development Limited | Real estate | 2020 |
| Kick UP the 80S Limited | Extraterritorial | 2012 |
| Kids Rule Play Cafe Ltd | Administrative & support | 2023 |
| Killco Holdings Limited | Real estate | 2023 |
| Killco Investments Limited | Construction | 2020 |
| Killco Trading Limited | Wholesale & retail | 2020 |
| Kilngate Homes Limited | Construction | 2025 |
| Kinex Ltd | Arts & recreation | 2025 |
| Kingdom Air Ltd | Manufacturing | 2022 |
| Kingdom Residential Ltd | Real estate | 2026 |
| Kingscroft Concrete & Grab Hire Limited | Construction | 2011 |
| Kingscroft Group Ltd | Wholesale & retail | 2021 |
| Kingscroft Professional Resources Limited | Administrative & support | 2011 |
| Kingsleys Fire and Security Limited | Administrative & support | 2025 |
| Kingswood Treescapes Limited | Administrative & support | 2023 |
| Kipco Consulting Limited | Professional & scientific | 2008 |
| Kirigeotab Ltd | Transport & logistics | 2022 |
| Kiss 'N' Make-Up Limited | Wholesale & retail | 2015 |
| KJB Asset Holdings Ltd | Administrative & support | 2019 |
| KJW Refrigeration Ltd | Professional & scientific | 2023 |
| KKG Ltd | Financial services | 2025 |
| Kkggs Limited | Hospitality | 2022 |
| Klass Kitchens Limited | Manufacturing | 2023 |
| KLC Chemicals Limited | Wholesale & retail | 2005 |
| Kleanique Ltd | Administrative & support | 2024 |
| KM Aesthetics Limited | Health & social care | 2015 |
| KM Education Recruitment Limited | Administrative & support | 2011 |
| KM Vehicle Movements Ltd | Transport & logistics | 2025 |
| KMO Electrical Limited | Construction | 2017 |
| Knights Court (Betty's Lane) Management Company Limited | Households | 1992 |
| Knightsbridge Homes (Midlands) Limited | Real estate | 2005 |
| Knownetwork Limited | Administrative & support | 2017 |
| Kojo Property Ltd | Real estate | 2019 |
| Kong YEE Ltd | Education | 2025 |
| KOR Management Services Limited | Professional & scientific | 2025 |
| Kormsen Ltd | Information & communication | 2024 |
| Kove Moto Limited | Wholesale & retail | 2024 |
| Koya Medical Ltd | Health & social care | 2020 |
| KP Cyber Ltd | Information & communication | 2026 |
| KPS Plumbing Solutions Limited | Construction | 2015 |
| Kris Kart Ltd | Arts & recreation | 2020 |
| Kroyce Services Limited | Administrative & support | 2022 |
| KRW Finance Limited | Financial services | 2018 |
| KSA Retail Ltd | Wholesale & retail | 2023 |
| KSK Peri Ltd | Hospitality | 2024 |
| KSM Selvan Ltd | Wholesale & retail | 2025 |
| Kukupulse Limited | Wholesale & retail | 2026 |
| Kurdish Pasha Haircut Ltd | Other services | 2026 |
| Kurdish Touch Barber Club Ltd | Other services | 2024 |
| Kween Trade Limited | Wholesale & retail | 2023 |
| L & L Properties (Midlands) Limited | Construction | 2024 |
| L & R Property Investment Ltd | Real estate | 2017 |
| L & S Developments Limited | Construction | 2004 |
| L a Plant Services Ltd | Manufacturing | 2018 |
| L G Weaver Limited | Real estate | 2007 |
| L J C Electrical Limited | Construction | 2000 |
| L Property Management Limited | Real estate | 2022 |
| L V & M V Properties Limited | Administrative & support | 2013 |
| L&K Flooring Ltd | Construction | 2025 |
| L&K Scaffolding Limited | Construction | 2026 |
| L&T Property Rentals Ltd | Real estate | 2022 |
| L.A. Land & Estates Limited | Real estate | 2018 |
| L.A.S. GAS Services Limited | Construction | 2019 |
| L.H. Hedgebright Limited | Construction | 1984 |
| L.Mason Limited | Construction | 2011 |
| L123 Limited | Construction | 2010 |
| LA ICT Services Limited | Information & communication | 2011 |
| LAB Psychology Ltd | Health & social care | 2024 |
| Lady CG. Ltd | Real estate | 2010 |
| Lakeside Development Co Staffs Ltd | Construction | 2025 |
| Lakeside Haulage Ltd | Transport & logistics | 2020 |
| Lakeside Hire Co Group Ltd | Transport & logistics | 2016 |
| Lakeside Hire Co Holdings Ltd | Financial services | 2019 |
| Lakeside Prop Co 1 Ltd | Construction | 2022 |
| Lakeside Prop Co 19 Ltd | Real estate | 2018 |
| Lakeside Prop Co 2 Ltd | Real estate | 2025 |
| Lamm Homes Limited | Construction | 2019 |
| Lancashire PIF 2 Ltd | Health & social care | 2021 |
| Lance Imagery Events Ltd | Hospitality | 2025 |
| Lancers Transport Services Ltd | Administrative & support | 2023 |
| Landywood Estate Management Solutions Limited | Real estate | 2026 |
| Lanmarc Limited | Construction | 1998 |
| Laplana Ltd | Transport & logistics | 2025 |
| Laser Design & Manufacturing Ltd | Manufacturing | 2019 |