| K I Rentals Ltd | Real estate | 2021 |
| K J Huggins Holdings Limited | Financial services | 2012 |
| K J Plastering Limited | Construction | 2001 |
| K K a General Store Ltd | Wholesale & retail | 2022 |
| K M B Property Company Limited | Real estate | 2015 |
| K Path 2012 LLP | | 2012 |
| K R + J Carter Limited | Construction | 2025 |
| K R Anderson Consulting Limited | Other services | 2018 |
| K T Motors UK Ltd | Wholesale & retail | 2024 |
| K Tech Automotive Peterborough Ltd | Other services | 2020 |
| K&C Training Ltd | Education | 2026 |
| K&D Hospitality Limited | Hospitality | 2024 |
| K&F Data Limited | Information & communication | 2024 |
| K&Jb Limited | Manufacturing | 2012 |
| K&K Investment Group Ltd | Real estate | 2025 |
| K&Maccommodations Ltd | Real estate | 2025 |
| K&W Logistics Limited | Transport & logistics | 2025 |
| K-Collect Ltd | Information & communication | 2020 |
| K-Group Holdings Limited | Real estate | 2025 |
| K.A.H Automotives Limited | Wholesale & retail | 2025 |
| K.B.Mansions Limited | Real estate | 1961 |
| K.C4 Service Ltd | Administrative & support | 2022 |
| K.I.M.Trans Ltd | Transport & logistics | 2025 |
| K.P Skinstudio Ltd | Other services | 2025 |
| K.Pr Transport Ltd | Transport & logistics | 2017 |
| K.Wings Bros Ltd | Hospitality | 2024 |
| K1 Autos Limited | Wholesale & retail | 2016 |
| K2 Autos Limited | Wholesale & retail | 2016 |
| K2 Care Limited | Professional & scientific | 2004 |
| K2A Property Ltd | Real estate | 2026 |
| K2C Wholesale Ltd | Wholesale & retail | 2026 |
| K3 Autos Limited | Wholesale & retail | 2016 |
| K4 Consulting Ltd | Information & communication | 2024 |
| K5 Autos Limited | Wholesale & retail | 2017 |
| K5 Limited | Wholesale & retail | 2015 |
| K6 Autos Limited | Wholesale & retail | 2017 |
| K8 Autos Limited | Wholesale & retail | 2020 |
| K9 Autos Limited | Wholesale & retail | 2020 |
| K9 Patrol Ltd | Administrative & support | 2006 |
| K9 Security Holdings Limited | Administrative & support | 2021 |
| K9-5 Doggie Daycare Ltd | Other services | 2023 |
| KA Facilities Limited | Construction | 2010 |
| KA Peterborough Ltd | Wholesale & retail | 2021 |
| Kaak Transport Limited | Administrative & support | 2017 |
| KAB Spedition Trucks Ltd | Transport & logistics | 2025 |
| Kabee Ltd | Wholesale & retail | 2012 |
| Kabukye Trust UK | Education | 2023 |
| Kabul Food Store Ltd | Wholesale & retail | 2022 |
| Kacper Cars Rental Ltd | Administrative & support | 2025 |
| Kadb Ltd | Manufacturing | 2024 |
| Kaddys Business Consult Limited | Information & communication | 2023 |
| Kadri Enterprise Ltd | Wholesale & retail | 2022 |
| KAE Consulting Ltd | Professional & scientific | 2021 |
| KAE Global Limited | Wholesale & retail | 2024 |
| Kafcoms Ltd | Construction | 2023 |
| Kafiq Ltd | Manufacturing | 2017 |
| Kafle Family Private Limited | Professional & scientific | 2025 |
| KAG Consulting Limited | Information & communication | 2012 |
| Kago Exports Ltd | Wholesale & retail | 2020 |
| KAH Autos Ltd | Wholesale & retail | 2025 |
| Kahinde Ltd | Health & social care | 2015 |
| Kaifs Limited | Wholesale & retail | 2023 |
| Kaiona Healthcare Limited | Health & social care | 2022 |
| Kairos Group Services Ltd | Real estate | 2021 |
| Kait Foods Ltd | Wholesale & retail | 2025 |
| Kait Properties Ltd | Real estate | 2025 |
| Kait Solutions Ltd | Professional & scientific | 2025 |
| Kaizen Enterprise Limited | Information & communication | 2013 |
| Kaizen Way Ltd | Professional & scientific | 2019 |
| Kaji Retail Ltd | Wholesale & retail | 2016 |
| Kakao Trans Ltd | Transport & logistics | 2026 |
| Kalice Wonderland Premium Party & Events Ltd | Professional & scientific | 2025 |
| Kalka Transport Ltd | Transport & logistics | 2015 |
| Kally O Limited | Construction | 2014 |
| Kalm Financial Limited | Professional & scientific | 2018 |
| Kaluk Ltd | Transport & logistics | 2018 |
| KAM MAC Engineering Ltd | Professional & scientific | 2021 |
| Kama Services Ltd | Other services | 2021 |
| Kamado Bono Ltd | Manufacturing | 2017 |
| Kamal Barber Ltd | Other services | 2019 |
| Kamal Ventures Limited | Professional & scientific | 2022 |
| Kamber Construction Limited | Extraterritorial | 2010 |
| Kamburo Ltd | Transport & logistics | 2025 |
| Kamcaj Ltd | Professional & scientific | 2019 |
| Kamil Miklaszewski Ltd | Transport & logistics | 2020 |
| Kampoeng Ltd | Financial services | 2023 |
| Kamu Academy Limited | Administrative & support | 2017 |
| Kana Family Holdings Ltd | Real estate | 2020 |
| Kanaily Investment Ltd | Real estate | 2025 |
| Kanapa Trans Ltd | Transport & logistics | 2019 |
| Kanarek Trans Ltd | Transport & logistics | 2016 |
| Kando Care Limited | Administrative & support | 2018 |
| Kando Co 1 Ltd | Administrative & support | 2023 |
| Kandoo Technology Ltd | Information & communication | 2024 |
| Kane Baron Speaking Ltd | Professional & scientific | 2023 |
| Kanevolve Limited | Professional & scientific | 2024 |
| Kang Ecom Services Ltd | Wholesale & retail | 2022 |
| Kani Property Holdings Ltd | Real estate | 2020 |
| Kanri UK Ltd | Hospitality | 2026 |
| Kapla Fitness Limited | Other services | 2022 |