| KSJ Enterprises Ltd | Education | 2010 |
| Ksks Property Ltd | Real estate | 2025 |
| KSM and Partners Limited | Administrative & support | 2020 |
| Ksnk Ltd | Real estate | 2018 |
| Ksrg Health Care Limited | Wholesale & retail | 2026 |
| Kssg Athi Ltd | Real estate | 2026 |
| KST House Ltd | Professional & scientific | 2025 |
| KST Investigations Limited | Administrative & support | 2025 |
| KST Property Holdings Limited | Real estate | 2026 |
| KT Group Constructions Ltd | Construction | 2019 |
| KTE Rail Ltd | Construction | 2021 |
| KTH Distributions Ltd | Wholesale & retail | 2026 |
| KTK Business Services Ltd | Professional & scientific | 2012 |
| KTL Super Care Services Ltd | Health & social care | 2022 |
| Ktmp UK Ltd | Wholesale & retail | 2024 |
| KTN Construct Limited | Construction | 2015 |
| KTS Family & Co Ltd | Real estate | 2025 |
| KTT Trading Limited | Construction | 2024 |
| Kuaz Limited | Real estate | 2020 |
| Kubimee Investment Limited | Construction | 2024 |
| Kubix Associates Limited | Professional & scientific | 2015 |
| Kubja Ltd | Wholesale & retail | 2026 |
| KUC UK Consultancy Limited | Professional & scientific | 2024 |
| Kudeta Films Limited | Information & communication | 2020 |
| Kuga Leatherwear Ltd | Wholesale & retail | 2017 |
| Kugali Limited | Information & communication | 2017 |
| Kugans Ltd | Wholesale & retail | 2020 |
| Kugis Limited | Construction | 2025 |
| Kugs Ltd | Real estate | 2020 |
| Kuhc Recruitment Services Limited | Administrative & support | 2024 |
| Kuka Properties Ltd | Real estate | 2022 |
| Kukda Housing Limited | Real estate | 2020 |
| Kuknus Intl Limited | Wholesale & retail | 2013 |
| Kukus Grilled Peri Peri Ltd | Hospitality | 2024 |
| Kukus Piri Piri Limited | Hospitality | 2019 |
| KUL Limited | Arts & recreation | 1999 |
| Kulalac Baby Foods Industry and Trade UK Ltd | | 2024 |
| Kulcha Street Ltd | Hospitality | 2019 |
| Kulfix Limited | Construction | 2023 |
| Kulosham Engineering Limited | Construction | 2004 |
| Kulraj Properties Limited | Real estate | 2025 |
| Kumarans Trading Ltd | Wholesale & retail | 2023 |
| Kumaris Juice Bar Ltd | Hospitality | 2026 |
| Kumba Buffet Ltd | Hospitality | 2025 |
| Kumba Curry & Grill Limited | Hospitality | 2021 |
| Kumba Markez Ltd | Wholesale & retail | 2024 |
| Kumi Link Services Limited | Professional & scientific | 2015 |
| Kumon Manor Park Ltd | Health & social care | 2023 |
| KUN Ming Ltd | Hospitality | 2017 |
| Kunda House Limited | Information & communication | 2024 |
| Kunni Cleaning Services Limited | Administrative & support | 2025 |
| Kurd Cuts London Limited | Other services | 2025 |
| Kurd Healthcare Ltd | Health & social care | 2021 |
| Kurdann Enterprise Ltd | Professional & scientific | 2024 |
| Kuro Africa Analytics Limited | Information & communication | 2024 |
| Kurpali Limited | Construction | 2022 |
| Kush Leases Limited | Real estate | 2018 |
| Kush Properties Ltd | Real estate | 2016 |
| Kushiali Limited | Wholesale & retail | 2023 |
| Kushood Enterprises Ltd | Wholesale & retail | 2020 |
| Kusular Limited | Hospitality | 2025 |
| Kutchi Ltd | Professional & scientific | 2026 |
| Kute Limited | Manufacturing | 2012 |
| Kutok Ltd | Construction | 2023 |
| KUZ Consultancy Ltd | Professional & scientific | 2021 |
| KV Trading Limited | Hospitality | 2014 |
| Kvitka Services Ltd | Construction | 2026 |
| KVK Infra Ltd | Administrative & support | 2025 |
| KW Engineering Solutions Limited | Transport & logistics | 2018 |
| Kwbathrooms Ltd | Wholesale & retail | 2022 |
| Kweki Ltd | Construction | 2023 |
| Kwik Body Works Ltd | Water & waste | 2007 |
| KXA Ltd | Wholesale & retail | 2016 |
| KY 9 Security Limited | Administrative & support | 2017 |
| KY Software Ltd | Information & communication | 2025 |
| KYA Limited | Information & communication | 2022 |
| Kyber Ilford Ltd | Other services | 2025 |
| Kybera Ltd | Professional & scientific | 2026 |
| Kyia Ltd | Manufacturing | 2023 |
| Kyia OFF Licence Ltd | Wholesale & retail | 2025 |
| Kyko Cloud Foundry Limited | Professional & scientific | 2024 |
| Kylo MER Ltd | Wholesale & retail | 2024 |
| Kymani Collection Limited | Wholesale & retail | 2021 |
| Kyokupaul Ltd | Construction | 2019 |
| Kysy Ltd | Wholesale & retail | 2022 |
| Kytis Limited | Health & social care | 2017 |
| KZ Consulting Engineers Limited | Professional & scientific | 2014 |
| KZD Construction Ltd | Construction | 2013 |
| KZL Properties Limited | Real estate | 2024 |
| KZM Brothers Limited | Hospitality | 2022 |
| L & a Holdings 17 Ltd | Real estate | 2021 |
| L & B Joinery Limited | Manufacturing | 2009 |
| L & D Foods (Finchley) Ltd | Wholesale & retail | 2014 |
| L & I Deptford Properties Limited | Real estate | 2017 |
| L & I Estates LLP | | 2017 |
| L & J Private Ltd | Hospitality | 2026 |
| L & R Electrical Ltd | Construction | 2020 |
| L 'Uniforme Limited | Manufacturing | 2018 |
| L a Home Repairs Ltd | Construction | 2020 |
| L Deonarain and Company Ltd | Professional & scientific | 2009 |