| Kinsey Property Ltd | Real estate | 2025 |
| Kiriyo Ltd | Information & communication | 2020 |
| Kirk Dezigns Limited | Professional & scientific | 2018 |
| Kiro Welding Solutions Limited | Manufacturing | 2024 |
| Kj's Glass Imports Limited | Wholesale & retail | 2020 |
| Kjdb Limited | Professional & scientific | 2025 |
| Kladdex Ltd | Construction | 2023 |
| Klara Speed Ltd | Transport & logistics | 2023 |
| KLG Street Eats Ltd | Hospitality | 2025 |
| Kliknex Tech Ltd | Wholesale & retail | 2025 |
| KLR Building Services Ltd | Construction | 2022 |
| KLX Consulting Limited | Administrative & support | 2016 |
| KM Chapters Ltd | Real estate | 2025 |
| KMH Building Services Limited | Construction | 2003 |
| KMH Transport Services Ltd | Transport & logistics | 2025 |
| KMJ Developments North West Ltd | Construction | 2025 |
| KMS (Cheshire) Limited | Manufacturing | 2005 |
| KMS Builders Ltd | Construction | 2026 |
| KMS Pipe Fitting & Fabrication Limited | Manufacturing | 2005 |
| Knight Forge Limited | Information & communication | 2022 |
| Knockout Supplements Ltd | Wholesale & retail | 2026 |
| Knot Perfect Limited | Manufacturing | 2026 |
| Known by Heart Ltd | Professional & scientific | 2026 |
| Knuckle Down Digital Limited | Administrative & support | 2022 |
| Knutsford Nails & Beauty Limited | Administrative & support | 2014 |
| Kogifi UK Limited | Information & communication | 2022 |
| Koka Ventures Ltd | Real estate | 2024 |
| Kolour Solutions Limited | Professional & scientific | 2022 |
| Kontingent UK Limited | Construction | 2024 |
| Kopa Pro Limited | Real estate | 2022 |
| Korba Ltd | Transport & logistics | 2024 |
| Korrect Kleaning UK Limited | Administrative & support | 2025 |
| Korrect Mart UK Limited | Wholesale & retail | 2025 |
| Koruna G&M Ltd | Wholesale & retail | 2023 |
| Kotamarthi Limited | Health & social care | 2012 |
| Kotan Limited | Hospitality | 2025 |
| Koza Transport Limited | Transport & logistics | 2014 |
| Kozy Group Ltd | Wholesale & retail | 2024 |
| Kozyra Property Ltd | Real estate | 2023 |
| KP Home Services Ltd | Construction | 2015 |
| KPI Care Limited | Administrative & support | 2015 |
| KPI Rail & Infrastructure Limited | Administrative & support | 2021 |
| KPI Recruiting Limited | Administrative & support | 2008 |
| KQS Services Limited | Professional & scientific | 2025 |
| KR Automotive Group Ltd | Administrative & support | 2023 |
| KR Fleet Solutions Ltd | Wholesale & retail | 2022 |
| KR Flexi Leasing Limited | Administrative & support | 2022 |
| Kraken PCS Ltd | Wholesale & retail | 2019 |
| Kristal Education Academy CIC | Education | 2020 |
| Kristal Therapeutic Academy Ltd | Education | 2026 |
| KRW Holdings Ltd | Financial services | 2024 |
| Krypto Medical Ltd | Administrative & support | 2025 |
| Krzysztof Car Polisher Limited | Wholesale & retail | 2018 |
| KSH Group of Companies Ltd | Financial services | 2018 |
| KSK Accountants Ltd | Professional & scientific | 2018 |
| KSK Contabilitate Ltd | Professional & scientific | 2023 |
| KTB Hairdressing Ltd | Other services | 2019 |
| KTC Property Investments Ltd | Real estate | 2022 |
| Ktsews Ltd | Manufacturing | 2020 |
| Kula Bags Limited | Wholesale & retail | 2019 |
| Kurdish Tasty Food Ltd | Hospitality | 2023 |
| Kuruba Properties Ltd | Households | 2025 |
| KVK Store Ltd | Wholesale & retail | 2023 |
| Kwikstart Ventures Ltd | Professional & scientific | 2024 |
| KZ Marketing Limited | Professional & scientific | 2025 |
| L & D Maguire Limited | Construction | 2001 |
| L a Global Trades Ltd | Wholesale & retail | 2026 |
| L D R Electrical Limited | Administrative & support | 2010 |
| L P Automotive Recovery Ltd | Wholesale & retail | 2021 |
| L P Automotive Repairs Limited | Wholesale & retail | 2025 |
| L. and S. Barber (Builders) Limited | Construction | 1977 |
| L. Ramsden Heating Services Limited | Construction | 2024 |
| LA- Faryham Resources Limited | Wholesale & retail | 2025 |
| Labquip Models Limited | Professional & scientific | 2021 |
| Labtec International Ltd | Financial services | 2010 |
| Lace and Leather Ltd | Wholesale & retail | 2023 |
| Lacey Brickwork Limited | Construction | 2023 |
| LAD Contracting Limited | Construction | 2016 |
| Lafert Electric Motors Limited | Wholesale & retail | 2001 |
| Lainston Colleys Limited | Construction | 2021 |
| Lake District Spice Limited | Hospitality | 2025 |
| Lakeland Lodge Limited | Real estate | 2005 |
| Lancasters Marketing Limited | Wholesale & retail | 2013 |
| Lancer Property Services Ltd | Construction | 2017 |
| Lanchester R&D Ltd | Information & communication | 2026 |
| Landen Property Group Ltd | Real estate | 2025 |
| Landwise Properties Ltd | Administrative & support | 2024 |
| Lane END Court Management Company Limited | Households | 2013 |
| Langley FC Youth CIC | Arts & recreation | 2024 |
| Lanka Automotives Global Limited | Wholesale & retail | 2024 |
| Lantern Care Ltd | Health & social care | 2018 |
| Lanyards ETC. Limited | Wholesale & retail | 2005 |
| LAP Productions Limited | Information & communication | 2022 |
| Larisa Popova Limited | Wholesale & retail | 2025 |
| Larvin and Clegg Funeral Care Ltd | Other services | 2019 |
| LAS Palmas Ltd. | Households | 1999 |
| LAS Vegaz Entertainment Ltd | Hospitality | 2025 |
| Lashforapound Ltd | Wholesale & retail | 2021 |
| Lashleys Travel Limited | Administrative & support | 2024 |
| Latham Estate and Lettings Agent Limited | Real estate | 2016 |