| Knollpac GB Limited | Extraterritorial | 2021 |
| Know House System Ltd | Wholesale & retail | 2019 |
| Know Press Publishing House Ltd | Information & communication | 2013 |
| Knowledge Grab Limited | Professional & scientific | 2024 |
| Knowlehill Results Ltd | Transport & logistics | 2015 |
| Known Nottingham Limited | Other services | 2023 |
| Knowpropertydevelopers Ltd | Real estate | 2025 |
| Knowteq IT Services Limited | Information & communication | 2024 |
| KNP Consulting Limited | Administrative & support | 2007 |
| KNR Designworks Ltd | Professional & scientific | 2025 |
| Knrr Limited | Wholesale & retail | 2002 |
| KNS Building and Maintenance Limited | Other services | 2013 |
| Knsmotors Ltd | Wholesale & retail | 2023 |
| KO Inc Limited | Professional & scientific | 2012 |
| KO Taswiq Ltd | Wholesale & retail | 2023 |
| Koban Group Holding Ltd | Hospitality | 2019 |
| Kobe Trading UK Limited | Wholesale & retail | 2021 |
| Koblit Limited | Wholesale & retail | 2017 |
| Kobra Feeders Ltd | Wholesale & retail | 2025 |
| Kochak Consultants Ltd | Professional & scientific | 2024 |
| KOD Limited | Professional & scientific | 2018 |
| Kofiyah Lounge Limited | Hospitality | 2022 |
| Koger Care and Services Limited | Administrative & support | 2026 |
| Kohiba Ltd | Wholesale & retail | 2022 |
| Kohinoor Greenlane Ltd | Hospitality | 2024 |
| Kohinoor Media Ltd | Information & communication | 2008 |
| Kohistani Ltd | Hospitality | 2019 |
| Kohli Construction Services Ltd | Construction | 2025 |
| KOI Sports CIC | Arts & recreation | 2018 |
| KOI Wholesale Limited | Wholesale & retail | 2011 |
| Koita Transport Limited | Transport & logistics | 2025 |
| Kojot Ltd | Wholesale & retail | 2019 |
| Kokni Helping Hands | Health & social care | 2008 |
| Koko B Limited | Information & communication | 2021 |
| Koko GB Limited | Manufacturing | 2004 |
| Koko Leisure Ltd | Hospitality | 2022 |
| Kolasa & Krawiec Properties Ltd | Real estate | 2022 |
| Koli Patel Samaj Daman UK Ltd | Health & social care | 2024 |
| Kolleh Health Limited | Health & social care | 2020 |
| Koloko Travel CIC | Administrative & support | 2023 |
| Kolompar Services Limited | Administrative & support | 2019 |
| Komatie Limited | Real estate | 2016 |
| Komorkis Ltd | Wholesale & retail | 2015 |
| Kondo Property Limited | Real estate | 2024 |
| Kondr Ltd | Professional & scientific | 2025 |
| Kondru Ltd | Information & communication | 2025 |
| Kong Group Ltd | Professional & scientific | 2018 |
| Koni Holdings Ltd | Financial services | 2025 |
| Konnect 2 Grow Ltd | Financial services | 2020 |
| Konstruct Recruitment Limited | Construction | 2013 |
| Kookie & BOO Properties Limited | Real estate | 2022 |
| Kookie Limited | Financial services | 2022 |
| Kool for Kuts Limited | Other services | 2008 |
| Koolkata Events Ltd | Hospitality | 2026 |
| Kooner Group Limited | Real estate | 2024 |
| Kooner Investments Limited | Real estate | 2015 |
| Kooners Cash & Carry Ltd | Wholesale & retail | 2017 |
| KOP Leicester Limited | Hospitality | 2013 |
| KOP49 Ltd | Hospitality | 2023 |
| Kopernik Grocery Limited | Wholesale & retail | 2025 |
| Kopernik Mini Market Ltd | Wholesale & retail | 2024 |
| Kora Developments Limited | Construction | 2019 |
| Kora Investments Limited | Real estate | 2019 |
| Korbiecore Ltd. | Manufacturing | 2019 |
| Kore Commercial Property Ltd | Real estate | 2020 |
| Korea Super Limited | Wholesale & retail | 2015 |
| Korim Medical Limited | Other services | 2016 |
| Korner Kiing Ltd | Wholesale & retail | 2024 |
| Kortana&You Limited | Wholesale & retail | 2025 |
| Kosoft Limited | Information & communication | 2013 |
| Kostane Ltd | Transport & logistics | 2024 |
| Kotec Investments Limited | Real estate | 2023 |
| Kotecha & Co. Accountants Limited | Professional & scientific | 2004 |
| Kotecha Associates Limited | Professional & scientific | 2004 |
| Kotecha Estates Limited | Real estate | 2025 |
| Kotecha Investments Limited | Real estate | 2019 |
| Kotecha Ondhia Investments Limited | Extraterritorial | 2014 |
| Kotecha Ondhia Limited | Real estate | 2013 |
| Koti Homes Ltd | Construction | 2020 |
| Kotty Properties Ltd | Real estate | 2018 |
| Kotyark Ltd | Wholesale & retail | 2018 |
| Koufa Travel Agency Limited | Administrative & support | 2024 |
| Koyani Education Limited | Education | 2011 |
| Koyasan Properties Limited | Real estate | 2014 |
| KP Auto Services & Tyres Ltd | Wholesale & retail | 2026 |
| KP Electrical Installation Ltd | Construction | 2025 |
| KP Fish & Chips Ltd | Hospitality | 2026 |
| KP HGV Maintenance Ltd | Wholesale & retail | 2025 |
| KP Mortgages Ltd | Financial services | 2024 |
| KP Realty Ltd | Real estate | 2025 |
| KP Supermarket Limited | Wholesale & retail | 2012 |
| Kp-Pharm Ltd | Professional & scientific | 2017 |
| Kpass Group Limited | Financial services | 2026 |
| Kpass Propco 1 Ltd | Real estate | 2026 |
| Kpbros Limited | Wholesale & retail | 2024 |
| KPC Tuition Limited | Education | 2024 |
| KPH (Leicester) Ltd | Transport & logistics | 2015 |
| KPK Medical Ltd | Health & social care | 2024 |
| KPM Impex Ltd | Wholesale & retail | 2023 |
| KPM Property Maintenance Ltd | Construction | 2025 |