| Kivi London Limited | Real estate | 2019 |
| KJJ Holdings Limited | Financial services | 2025 |
| KJM Construction Contractors Ltd | Construction | 2020 |
| KK Inspiration Limited | Transport & logistics | 2018 |
| KK Mann Consulting Ltd | Professional & scientific | 2022 |
| KKV Practice Limited | Administrative & support | 2014 |
| Klaasvakie Limited | Health & social care | 2013 |
| Klass 1 Services Ltd | Information & communication | 2014 |
| Klean & Klear Property Services Ltd | Administrative & support | 2026 |
| Klickbox Studio Ltd | Professional & scientific | 2026 |
| KM Building Business Ltd | Construction | 2014 |
| Kmds Consultancy Limited | Extraterritorial | 2013 |
| Kmds Group Ltd | Professional & scientific | 2013 |
| Kmds Holdings Limited | Real estate | 2021 |
| Kmds Investments LLP | | 2013 |
| KMP Associates (London) LLP | | 2024 |
| KMP Associates UK Limited | Professional & scientific | 2009 |
| Kmsg Ltd | Other services | 2023 |
| KN Installation Ltd | Construction | 2021 |
| KN Invest Ltd | Financial services | 2024 |
| KN Property Holdings Ltd | Real estate | 2026 |
| KN Teeth Ltd | Health & social care | 2023 |
| KN TGC Limited | Wholesale & retail | 2020 |
| Knahmad Traders Ltd | Information & communication | 2020 |
| Knight Marketing Ltd | Professional & scientific | 2025 |
| Knights Fire Protection Ltd | Public administration | 2016 |
| KO Maintenance Limited | Other services | 2009 |
| KO Original Cuisine Ltd | Hospitality | 2025 |
| Koby Adom Limited | Information & communication | 2018 |
| Koil Contracting Limited | Construction | 2017 |
| Kollexy Consultancy Limited | Information & communication | 2019 |
| Kondang Djoyo Limited | Hospitality | 2017 |
| Konsortium Limited | Manufacturing | 2016 |
| Konsultado Limited | Professional & scientific | 2019 |
| Koosi Ltd | Manufacturing | 2025 |
| Kopo Consultancy Ltd | Professional & scientific | 2024 |
| Koral's Catering Ltd | Hospitality | 2017 |
| Kosk London Ltd | Wholesale & retail | 2019 |
| Kotsmed Ltd | Public administration | 2023 |
| Kpcl Limited | Construction | 2013 |
| KPD Practice Limited | Health & social care | 2025 |
| KR Clearance Limited | Water & waste | 2023 |
| Kras Global Limited | Administrative & support | 2022 |
| Krasniqi Flooring Ltd | Construction | 2026 |
| Kren Medical Services Limited | Health & social care | 2017 |
| Krio Heritage Foundation (KHF) | Education | 2021 |
| Krish Managing Ltd | Real estate | 2018 |
| Krmj & Co Properties Ltd | Real estate | 2024 |
| Krown Homes Ltd | Real estate | 2025 |
| KS DEM Facades Ltd | Construction | 2021 |
| Kspe Ltd | Real estate | 2025 |
| Ksrm Consultancy Limited | Professional & scientific | 2021 |
| KTP Consulting Ltd | Professional & scientific | 2021 |
| Ktpk Ltd | Real estate | 2020 |
| Ktrade Holdings Limited | Financial services | 2026 |
| Kuka Investments Limited | Financial services | 2015 |
| Kukadiya & Sons Limited | Manufacturing | 2024 |
| Kustom Property Ltd | Real estate | 2022 |
| Kuul Limited | Wholesale & retail | 2014 |
| KV Orthopaedic Courses Ltd | Education | 2025 |
| KVR Assets Limited | Real estate | 2021 |
| KVR Holdings Limited | Hospitality | 2016 |
| Kwajo Tweneboa Ltd | Information & communication | 2022 |
| Kwcg Limited | Wholesale & retail | 2013 |
| Kyvaan Healthcare Holdings Limited | Financial services | 2026 |
| Kyvaan Healthcare Limited | Wholesale & retail | 2025 |
| L & B Solutions Limited | Construction | 2015 |
| L & E Construction Ltd | Construction | 2018 |
| L & S7 Property Management Limited | Real estate | 2013 |
| L & T Taxis Limited | Administrative & support | 2024 |
| L 5 Partnerships Limited | Real estate | 2008 |
| L a Strachan Limited | Health & social care | 2015 |
| L G Microcom Limited | Information & communication | 1985 |
| L J C Engineering & Construction Ltd | Construction | 2004 |
| L&B Building Contracts Limited | Extraterritorial | 2015 |
| L&B Building Developments Limited | Extraterritorial | 2015 |
| L&R Futures Limited | Real estate | 2022 |
| L&R IT Ltd | Information & communication | 2015 |
| L-A-S Construction Limited | Construction | 2018 |
| L. Ambrose Property Maintenance Limited | Construction | 2012 |
| L.A. Ellis & Sons Limited | Professional & scientific | 1982 |
| L.A. Ellis and Company Limited | Construction | 1961 |
| L.B Hospitality Ltd | Administrative & support | 2019 |
| L.I Surveying Limited | Professional & scientific | 2024 |
| L.S.A. Projects Limited | Professional & scientific | 1994 |
| LA Belle Boutique Ltd | Wholesale & retail | 2019 |
| LA Nu-Range Ltd | Real estate | 1998 |
| LA Pedale Limited | Other services | 2018 |
| LA Search Limited | Professional & scientific | 2018 |
| LAB24 Limited | Information & communication | 2023 |
| Labbetts Electrical Services Limited | Construction | 2002 |
| Laburnum Health Limited | Health & social care | 2014 |
| Ladent Limited | Health & social care | 2024 |
| Lady B'S Kitchen Ltd | Hospitality | 2013 |
| Lady B'S Sauces Limited | Manufacturing | 2025 |
| Laiba Amad Ltd | Real estate | 2025 |
| Laings Accountancy Services Ltd | Professional & scientific | 2022 |
| Lake Avenue Management Company Limited | Households | 1990 |
| Laken Ltd | Information & communication | 2023 |
| Lakeshore Building & Maintenance Company Ltd | Other services | 2023 |