| KH Delights Ltd | Hospitality | 2025 |
| Khanli Design Ltd | Professional & scientific | 2023 |
| Khilari Ltd | Health & social care | 2021 |
| Kibo Group Holdings Limited | Health & social care | 2025 |
| Kibo Holdings Limited | Health & social care | 2018 |
| Kidzilla Media Ltd | Information & communication | 2016 |
| Kiki Investments Ltd | Extraterritorial | 2011 |
| Kiko Real Estate Ltd | Real estate | 2020 |
| Kilkee Investments Ltd | Extraterritorial | 2021 |
| Kilpike Limited | Financial services | 2022 |
| KIN Creatives Ltd | Professional & scientific | 2020 |
| Kinderways Ltd | Administrative & support | 2023 |
| Kinderways Property Management Ltd | Real estate | 2024 |
| Kinderways Support Services Ltd | Health & social care | 2023 |
| Kineticus Limited | Professional & scientific | 2006 |
| King Bros. (Butchers) Limited | Real estate | 1978 |
| King Civils Ltd | Construction | 1984 |
| King Group (East Anglia) Limited | Administrative & support | 2021 |
| Kingsgate Homes (Eastern) Limited | Construction | 2014 |
| Kingsway Roofing Ltd | Construction | 2025 |
| Kingswood Drives & Patio's Ltd | Construction | 2025 |
| Kinterflock Ltd | Real estate | 2025 |
| Kintsugi Motorcycles Ltd | Wholesale & retail | 2023 |
| Kiock Investments Limited | Extraterritorial | 2023 |
| Kirby Read Holdings Ltd | Real estate | 2021 |
| Kirk Connected Construction Limited | Construction | 2004 |
| Kirks Holdings Limited | Financial services | 2021 |
| Kirks Kebabs Limited | Wholesale & retail | 2004 |
| Kirks Quality Foods (Skegness) Limited | Wholesale & retail | 2020 |
| Kirks Quality Foods Limited | Wholesale & retail | 2005 |
| Kirt Powell Plumbing and Heating Limited | Construction | 2021 |
| Kissmet Ltd | Arts & recreation | 2025 |
| Kiszczak Trans Ltd | Transport & logistics | 2016 |
| Kiteblade Ltd | Professional & scientific | 2014 |
| Kixx South Kesteven Ltd | Education | 2024 |
| KJK Construction (Lincs) Ltd | Construction | 2023 |
| KJS Inspection Ltd | Professional & scientific | 2023 |
| KJW Technical Solutions Limited | Wholesale & retail | 2016 |
| Kkbo Ltd | Arts & recreation | 2019 |
| Kkwatch Ltd | Real estate | 2023 |
| KLA Property Services Limited | Construction | 2017 |
| Klakse Ltd | Transport & logistics | 2016 |
| Klaudtrans Ltd | Transport & logistics | 2025 |
| Kliza Company Ltd | Transport & logistics | 2014 |
| Kloe Gibson Coaching Ltd | Other services | 2025 |
| KLR Support Ltd | Information & communication | 2025 |
| KM Delivery Ltd | Transport & logistics | 2017 |
| KM Drivers Ltd. | Transport & logistics | 2018 |
| KM Properties (Lincs) Limited | Real estate | 2022 |
| KM Trans Ltd | Transport & logistics | 2022 |
| KMC Reliability Ltd | Transport & logistics | 2016 |
| KMG Design & Management Ltd | Professional & scientific | 2009 |
| KMH Electrical Ltd | Construction | 2015 |
| KMI Quadring Limited | Construction | 2020 |
| KMK Global Ltd | Transport & logistics | 2014 |
| KML Transport Ltd | Transport & logistics | 2022 |
| KMR Consulting Limited | Professional & scientific | 2024 |
| KMR Local Marketing Ltd | Information & communication | 2020 |
| KN Accounting Ltd | Professional & scientific | 2016 |
| KN Business Services Ltd | Professional & scientific | 2019 |
| KN Commercial Ltd | Administrative & support | 2026 |
| Knav Logistics Solutions Ltd | Transport & logistics | 2025 |
| Knights Custom Conversions Limited | Manufacturing | 2015 |
| Knightsbridge Prestige Motors Ltd | Wholesale & retail | 2013 |
| Knightsbridge SPV1 Limited | Construction | 2015 |
| KNM Properties Ltd | Real estate | 2018 |
| Knot Waste Limited | Wholesale & retail | 2022 |
| Konduki Limited | Information & communication | 2016 |
| Konex Ltd | Transport & logistics | 2021 |
| Konosidou Ltd | Hospitality | 2023 |
| Kornik Trans Ltd | Transport & logistics | 2015 |
| Kosher Customs Ltd | Extraterritorial | 2019 |
| KOT Transport Ltd | Transport & logistics | 2014 |
| KP Wheel Ltd | Wholesale & retail | 2021 |
| KPH Plumbing and Heating Ltd | Construction | 2023 |
| KPX Consultancy Ltd | Professional & scientific | 2025 |
| Krapas Ltd | Transport & logistics | 2017 |
| Kras Transport Ltd | Transport & logistics | 2025 |
| Kraso Ltd | Wholesale & retail | 2019 |
| Kravings LS Ltd | Hospitality | 2022 |
| KRB Builders Limited | Construction | 2002 |
| Kreatif Design Ltd | Professional & scientific | 2008 |
| Krisschampion Ltd | Transport & logistics | 2018 |
| Kristi Kristi Ltd | Manufacturing | 2018 |
| KRN PL Ltd | Transport & logistics | 2025 |
| Kruminsgw Ltd | Construction | 2023 |
| Kruse Holdings Ltd | Financial services | 2026 |
| KT Smiles Ltd | Health & social care | 2024 |
| Kubas Transport Ltd | Transport & logistics | 2022 |
| Kukis Transport Ltd | Transport & logistics | 2021 |
| Kurakura Limited | Hospitality | 2015 |
| KV Auto Detailing Limited | Wholesale & retail | 2025 |
| KYM Hardman Ltd | Administrative & support | 2016 |
| L & D Flowers Limited | Agriculture & fishing | 2006 |
| L a Development Services Limited | Real estate | 2016 |
| L and R Joyce Holdings Limited | Financial services | 2025 |
| L B Resi-Pave Ltd | Construction | 2018 |
| L B Services (Lincs) Ltd | Transport & logistics | 2023 |
| L C Dobney Ltd | Administrative & support | 2016 |
| L F Creations Ltd | Other services | 2021 |