| KM Haulage Limited | Transport & logistics | 2022 |
| KM Wired Ltd | Construction | 2016 |
| KMC Administration Ltd | Administrative & support | 2019 |
| Knight - Maley Limited | Financial services | 2003 |
| Knight Shot (UK) Ltd | Wholesale & retail | 2018 |
| Knights Care (3) Limited | Health & social care | 1998 |
| Knights Care (4) Limited | Health & social care | 2023 |
| Knights Care (5) Limited | Health & social care | 2023 |
| Knights Care (6) Limited | Health & social care | 2023 |
| Knights Care (7) Limited | Health & social care | 2023 |
| Knights Care Group Limited | Administrative & support | 2021 |
| Knights Care Holdings Limited | Financial services | 2021 |
| Knights Care Limited | Health & social care | 2006 |
| Knightsbridge Investment Properties Limited | Real estate | 2016 |
| Knives From Japan Ltd | Administrative & support | 2016 |
| KNT Training Limited | Education | 2010 |
| Kola Properties Ltd | Real estate | 2026 |
| Kolbie’S K9’S Ltd | Other services | 2025 |
| Konstantin Antiques Ltd | Wholesale & retail | 2017 |
| KOO Chesterfield Limited | Hospitality | 2017 |
| Kooltec Ltd | Extraterritorial | 2007 |
| Koops Landscaping Ltd | Administrative & support | 2025 |
| Korsh Barbers Ltd | Other services | 2024 |
| Koru Care UK Ltd | Health & social care | 2021 |
| Koru Holdings Elizabeth Ltd | Financial services | 2021 |
| Koru Holdings Pine Ltd | Real estate | 2022 |
| Koszegi Mortgage Services Limited | Financial services | 2007 |
| KP IT Services Ltd | Information & communication | 2025 |
| Kpgs Developments Limited | Professional & scientific | 2025 |
| KPR Joinery Limited | Construction | 2008 |
| Kprm Limited | Professional & scientific | 2007 |
| KR Business Excellence Limited | Administrative & support | 2017 |
| Kranlee Customs Brokerage Ltd | Transport & logistics | 2020 |
| Kranlee Distribution Limited | Transport & logistics | 2023 |
| Kranlee Limited | Financial services | 2025 |
| Kranlee Logistics Limited | Transport & logistics | 2019 |
| KRW Automotive Ltd | Wholesale & retail | 2023 |
| Krypd Ltd | Manufacturing | 2019 |
| KS Concrete Pumping Ltd | Manufacturing | 2020 |
| KS Real Estate Ltd | Real estate | 2021 |
| KSD Plumbing & Heating Ltd | Construction | 2019 |
| KSD Property Solutions Ltd | Real estate | 2024 |
| KSJ Building Contractors Limited | Construction | 2023 |
| Kthx Limited | Arts & recreation | 2023 |
| Ktjn Limited | Information & communication | 2019 |
| KTN Construction Limited | Construction | 2019 |
| KTS ACS Ltd | Administrative & support | 2024 |
| Kudos Alloys Limited | Wholesale & retail | 2014 |
| Kudos Office Supplies Limited | Wholesale & retail | 1998 |
| Kuhlmann Holding Limited | Financial services | 2025 |
| Kuva Wedding Photography Limited | Professional & scientific | 2021 |
| KVP Retail Ltd | Wholesale & retail | 2024 |
| KW Roofing & Building Ltd | Construction | 2025 |
| Kwicserve Limited | Transport & logistics | 1980 |
| Kyco Fall Protection Ltd | Construction | 2025 |
| Kyle TM Ltd | Other services | 2017 |
| KZG Properties Limited | Real estate | 2020 |
| L & J Housing Solutions Limited | Real estate | 2023 |
| L and K UK Enterprises Ltd | Real estate | 2017 |
| L B Mobility Ltd | Wholesale & retail | 2020 |
| L B Psychology Ltd | Health & social care | 2022 |
| L C Clinical Consultancy Limited | Professional & scientific | 2016 |
| L C Fencing Chesterfield Limited | Construction | 2013 |
| L G E Electrical Contractors Limited | Construction | 2022 |
| L Groves Properties Ltd | Construction | 2025 |
| L J Rooftech Limited | Construction | 2019 |
| L J TEN Ltd | Real estate | 2025 |
| L K B Bargains Limited | Wholesale & retail | 2024 |
| L R Collections Limited | Administrative & support | 2011 |
| L&R Trailers Clowne Limited | Wholesale & retail | 2022 |
| L&T Medics and Training Ltd | Education | 2025 |
| L. D. Leigh & Co. Limited | Wholesale & retail | 2006 |
| L. Jenkins & Sons Limited | Construction | 2013 |
| L. M. Landscape & Paving Ltd | Administrative & support | 2023 |
| L.A. Landscaping Services Limited | Administrative & support | 2000 |
| L.F.T. Construction Limited | Wholesale & retail | 2005 |
| L.K. Engineering-Uk Ltd | Professional & scientific | 2022 |
| LA Bell Ltd | Health & social care | 2022 |
| LA Delicious Kostas Ltd | Hospitality | 2025 |
| LA Nails Spa & Beauty Limited | Other services | 2024 |
| LA Nails Spa Ltd | Other services | 2025 |
| LA Playa Consulting Ltd | Professional & scientific | 2014 |
| La'Vericu. Ltd | Transport & logistics | 2023 |
| LAB4 Ltd | Professional & scientific | 2024 |
| Laben Electrical Limited | Manufacturing | 2026 |
| Lade Wellness Solutions Ltd | Health & social care | 2025 |
| Ladies of Law Limited | Other services | 2026 |
| Laffacake Ltd | Arts & recreation | 2025 |
| Lahdidah Entertainments Limited | Arts & recreation | 2024 |
| Laird Matthews Ltd | Administrative & support | 2024 |
| Lamar Exell Design Ltd. | Professional & scientific | 1998 |
| Lamb's Glamping Ltd | Hospitality | 2022 |
| Lance&Greens Ltd | Wholesale & retail | 2024 |
| Land Research Associates Limited | Professional & scientific | 2003 |
| Landscaped Ltd. | Administrative & support | 2023 |
| Lane END Securities Limited | Real estate | 2003 |
| Langers Ltd | Wholesale & retail | 2005 |
| Langley Trading (Northwest) Limited | Wholesale & retail | 2017 |
| Lans Wares Ltd | Wholesale & retail | 2025 |
| Lantek Services Limited | Information & communication | 2006 |