| Kovar Global Ltd | Wholesale & retail | 2026 |
| Kowi Limited | Real estate | 2011 |
| Koxka Limited | Real estate | 2017 |
| Koxmet Promotions Ltd | Wholesale & retail | 2021 |
| Kozaeker Ltd | Wholesale & retail | 2025 |
| Koztek Engineering Ltd | Manufacturing | 2024 |
| KP & Co Accountants Ltd | Professional & scientific | 2019 |
| Kp-Fitters Ltd | Construction | 2011 |
| Kpeople Limited | Professional & scientific | 1998 |
| KPN Structural Design Ltd | Professional & scientific | 2026 |
| Krank Films Ltd | Information & communication | 2026 |
| Krasistal Ltd | Wholesale & retail | 2024 |
| KRD Tech Ltd | Information & communication | 2012 |
| Kreative Construction Ltd | Construction | 2023 |
| Kreative Ltd | Professional & scientific | 2023 |
| Kremi Limited | Other services | 2018 |
| Kreston (London) Limited | Real estate | 2026 |
| Kreston Holdings Limited | Financial services | 2025 |
| Kreston Law Limited | Professional & scientific | 2018 |
| Krgl Ltd | Transport & logistics | 2025 |
| Kris London Ltd | Transport & logistics | 2018 |
| Kris N Analytics Limited | Professional & scientific | 2024 |
| Krish Place (UK) Limited | Real estate | 2022 |
| Krisztian Ltd | Health & social care | 2014 |
| Kron Construction Ltd | Construction | 2023 |
| Kronstadt Support Services Limited | Professional & scientific | 2025 |
| KS Gardening Ltd | Other services | 2023 |
| KSA 1MIL.XYZ Ltd | Wholesale & retail | 2020 |
| KSD Electricals Ltd | Construction | 2020 |
| Ksimons Motors Ltd | Wholesale & retail | 2024 |
| KSK Clothing Ltd | Wholesale & retail | 2026 |
| Kskn Group Limited | Real estate | 2022 |
| KSP Digital Nomad Group Ltd | Professional & scientific | 2022 |
| Kstm Trading Ltd | Wholesale & retail | 2022 |
| KSY Electrical Ltd | Construction | 2019 |
| KT Business Solutions Limited | Administrative & support | 2012 |
| KT Media & Publishing Ltd | Information & communication | 2025 |
| KT Roofing Limited | Construction | 2015 |
| Kufamba Logistics Ltd | Transport & logistics | 2025 |
| Kulpol International LP | | 2015 |
| Kulup Events Ltd | Other services | 2019 |
| Kumasi Academy Past Students Association (Kapsa - Akunini) UK | Other services | 2020 |
| Kung FU Lighting Limited | Information & communication | 2024 |
| Kurecikliler Community Centre Ltd | Health & social care | 2020 |
| Kurenta Limited | Professional & scientific | 2025 |
| Kuro Network Limited | Professional & scientific | 2025 |
| Kursalina Ltd | Construction | 2016 |
| Kurt & Co Investments Limited | Real estate | 2022 |
| Kurt & Co Surveyors Limited | Professional & scientific | 2021 |
| Kushiara Limited | Transport & logistics | 2025 |
| Kussan Mechanical Repair and Solutions Ltd | Manufacturing | 2021 |
| Kuvars Ltd | Wholesale & retail | 2020 |
| Kuzey Kaan Ltd | Hospitality | 2020 |
| Kuzmann Productions Limited | Information & communication | 2025 |
| Kuzony Ltd | Health & social care | 2011 |
| KV Nails & Beauty Limited | Other services | 2016 |
| KX Limited | Information & communication | 2022 |
| Kyber Solutions Ltd | Real estate | 2025 |
| Kyeyune Group of Companies Ltd | Wholesale & retail | 2026 |
| Kyle Boyd Ltd | Manufacturing | 2019 |
| KYN Properties Ltd | Real estate | 2025 |
| KZ Consulting Group Ltd | Professional & scientific | 2025 |
| Kzibeauty Ltd | Wholesale & retail | 2025 |
| Kzlegacy Ltd | Professional & scientific | 2025 |
| KÖY Grill Ltd | Hospitality | 2019 |
| L & F Plant Hire Company Limited | Administrative & support | 1971 |
| L & I Drainage Solutions Ltd | Water & waste | 2010 |
| L & M(Heating)Supplies Limited | Wholesale & retail | 1970 |
| L & R Distribution Limited | Transport & logistics | 2014 |
| L B Sales Consultants Limited | Wholesale & retail | 2012 |
| L Burbidge Consulting Limited | Information & communication | 2016 |
| L C Andrews Limited | Real estate | 2014 |
| L C C O Accounting Limited | Professional & scientific | 1997 |
| L C Supreme Limited | Administrative & support | 2015 |
| L Decor Limited | Other services | 2018 |
| L E T T Properties and Management Ltd | Real estate | 2024 |
| L J Consultancy Training Services C.I.C. | Education | 2024 |
| L Kolgjini Construction Ltd | Construction | 2023 |
| L N D Management Services Ltd | Households | 2024 |
| L&A (Barkingside) Limited | Other services | 2023 |
| L&A (Harlow) Limited | Other services | 2023 |
| L&A (Ramsgate) Limited | Other services | 2023 |
| L&A (Romford) Limited | Other services | 2023 |
| L&B Products Limited | Wholesale & retail | 2020 |
| L&K Ergun Ltd | Hospitality | 2025 |
| L&P Charm Ltd | Hospitality | 2025 |
| L'Amour Bakes Ltd | Manufacturing | 2024 |
| L'Artista (Hendon) Limited | Hospitality | 1998 |
| L'Ecole DE Ballet Classique Limited | Education | 2022 |
| L'Ecole DE Danse Classique Limited | Education | 2025 |
| L-Attivor Limited | Wholesale & retail | 2014 |
| L. Babij System Ltd | Construction | 2016 |
| L.A.E DRY Lining Limited | Construction | 2022 |
| L.A.R Truong Limited | Other services | 2016 |
| L.B Nails Limited | Other services | 2019 |
| L.E.P.C Visuals Ltd | Information & communication | 2023 |
| L.H.F.L Ltd | Administrative & support | 2021 |
| L2 Properties Ltd | Real estate | 2019 |
| L2B Ltd. | Wholesale & retail | 2022 |
| LA & Co Properties Ltd | Real estate | 2025 |