| Kiren Ltd | Construction | 2020 |
| Kirkby Platinum Lease Limited | Real estate | 2024 |
| Kirkby Platinum Ltd | Real estate | 2022 |
| KIT Property Group Ltd | Real estate | 2026 |
| Kitform Trade Ltd | Construction | 2025 |
| Kiyan's Motor Ltd | Wholesale & retail | 2025 |
| KJ (Birmingham) Limited | Health & social care | 2024 |
| KJG Site Services Ltd | Professional & scientific | 2016 |
| KK Builds Ltd | Construction | 2025 |
| KKA News Ltd | Wholesale & retail | 2025 |
| KLA Property Solutions Ltd | Real estate | 2024 |
| Kliving Life Ltd | Professional & scientific | 2020 |
| KLT Services Limited | Hospitality | 2016 |
| Kluxestate Ltd | Households | 2025 |
| KM Rayhan Ltd | Wholesale & retail | 2023 |
| KMB Shipping Group Limited | Extraterritorial | 2008 |
| KMB Shipping Limited | Extraterritorial | 2004 |
| KMJ Windows and Doors Ltd | Wholesale & retail | 2021 |
| KMS Retail Limited | Wholesale & retail | 2025 |
| Kn-Lix Limited | Arts & recreation | 2024 |
| Knight Electronics UK Limited | Wholesale & retail | 2009 |
| Knightsbridge Investments Limited | Financial services | 1999 |
| KNR Systems Limited | Construction | 2007 |
| Kohala Transport Ltd | Transport & logistics | 2025 |
| Koko Tech Ltd | Wholesale & retail | 2021 |
| Komac Limited | Manufacturing | 1997 |
| Komerse Limited | Professional & scientific | 2015 |
| Komscape Holdings Limited | Real estate | 2025 |
| Komscape Limited | Wholesale & retail | 2020 |
| Kong Construction Ltd | Construction | 2019 |
| Konnaf Limited | Wholesale & retail | 2025 |
| Kontaktlaw Bankruptcy Services Ltd | Professional & scientific | 2019 |
| Kontaktlaw Ltd | Professional & scientific | 2016 |
| Korriq Limited | Professional & scientific | 2008 |
| Kotoko Ltd Ltd | Health & social care | 2023 |
| KP Properties 2021 Limited | Real estate | 2015 |
| KPC Electrical Installations Limited | Construction | 2013 |
| KPD Consultancy Ltd | Professional & scientific | 2025 |
| KPM Supplies & Manufacturing Ltd | Manufacturing | 2025 |
| KPM Supplies Ltd | Manufacturing | 2026 |
| KR Construction Solutions Ltd | Construction | 2021 |
| Kraken Construction (Midlands) Ltd | Construction | 2017 |
| Krasini Limited | Hospitality | 2024 |
| Kris Carpentry Ltd | Construction | 2023 |
| KRT SMP Ltd | Other services | 2020 |
| KS1 Limited | Financial services | 2020 |
| KS4 Limited | Financial services | 2020 |
| KSR Management (UK) Ltd | Professional & scientific | 2020 |
| KSS Business Limited | Health & social care | 2022 |
| KSS Estates Management Limited | Real estate | 2022 |
| KT Investment Properties Ltd | Real estate | 2021 |
| KTB Holdings Limited | Construction | 1996 |
| KTF Midlands Ltd | Transport & logistics | 2026 |
| Kudhail Commercial Property Investments Ltd | Real estate | 2026 |
| Kudhail Holdings & Investments Ltd | Financial services | 2026 |
| Kudhail Holdings Ltd | Financial services | 2017 |
| Kudhail Properties Ltd | Real estate | 2020 |
| Kudhail Property Investments Ltd | Real estate | 2026 |
| Kurdistan Logistics Ltd | Wholesale & retail | 2022 |
| KVL Ltd | Real estate | 2023 |
| KW Fire Solutions Ltd | Administrative & support | 2024 |
| KW Hair & Cosmetic Tattoo Ltd | Other services | 2026 |
| KW Holdings & Investments Ltd | Financial services | 2026 |
| KWG Pipelines Limited | Manufacturing | 2015 |
| Kylaks Fashion 4 Littles Ltd | Wholesale & retail | 2025 |
| Kylean Logistics Limited | Transport & logistics | 2025 |
| KZT Voyage Ltd | Transport & logistics | 2025 |
| K’S X Comps Limited | Arts & recreation | 2025 |
| L & P Sourcing Ltd | Real estate | 2018 |
| L & S Plumbing & Heating Limited | Construction | 2015 |
| L & S Property One Limited | Real estate | 2024 |
| L C Engineering Services Ltd | Construction | 2019 |
| L E Services Limited | Construction | 2018 |
| L J P Accounting Limited | Professional & scientific | 2009 |
| L K Heating & Plumbing Limited | Construction | 2018 |
| L K Saini Transport Ltd | Transport & logistics | 2020 |
| L M Horses Limited | Agriculture & fishing | 2020 |
| L&E Automotive Ltd | Wholesale & retail | 2023 |
| L&L Building & Interiors Ltd | Construction | 2019 |
| L&L Chatham Limited | Financial services | 2012 |
| L&L Chatham Property Limited | Real estate | 2015 |
| L&Lb Holdings Ltd | Financial services | 2025 |
| L&S Decorating Contracts Ltd | Construction | 2026 |
| L.H Commercial and Residential Property Ltd | Wholesale & retail | 2025 |
| LA & LA Limited | Wholesale & retail | 2025 |
| La-Di-Da Catering Company Limited | Hospitality | 2010 |
| Laal Motors Ltd | Manufacturing | 2023 |
| Lacey Home Interiors Ltd | Manufacturing | 2025 |
| Lachhar Enterprises Limited | Hospitality | 2021 |
| Ladders 999 Limited | Extraterritorial | 2008 |
| Ladybeck Limited | Extraterritorial | 1990 |
| LAH Consultancy Limited | Professional & scientific | 2021 |
| Lakeside Development Co Stafford Ltd | Construction | 2025 |
| Lakeside Fleet Management Ltd | Transport & logistics | 2024 |
| Lakeside Golf Limited | Hospitality | 2023 |
| Lala House Limited | Wholesale & retail | 2011 |
| Lally Developments Limited | Real estate | 2015 |
| Lamp Tavern Live Limited | Hospitality | 2026 |
| Lamptav Ltd | Professional & scientific | 2024 |
| Lancaster Armoury Limited | Manufacturing | 2016 |