| Koirala Limited | Hospitality | 2025 |
| Kokello Limited | Health & social care | 2015 |
| Komrun Limited | Hospitality | 2021 |
| Konrad Property Ltd | Real estate | 2023 |
| Korovation Limited | Real estate | 2024 |
| Kovacs Group Ltd | Administrative & support | 2012 |
| Koyum Limited | Hospitality | 2026 |
| Kozi Beds Limited | Wholesale & retail | 2013 |
| KPT Private Limited | Wholesale & retail | 2020 |
| Krafthaus Communications Limited | Professional & scientific | 2016 |
| Kram Sheet Metal Limited | Manufacturing | 2005 |
| Krazy Krocs Limited | Hospitality | 2024 |
| KRB Power Systems Ltd | Energy | 2017 |
| Kriss Europe Ltd | Transport & logistics | 2016 |
| KRM Contracts Limited | Professional & scientific | 2014 |
| KRM Developments Limited | Construction | 2020 |
| Krown Property Ltd | Real estate | 2021 |
| KRS Estate Planning Ltd | Professional & scientific | 2017 |
| KRS Investors Ltd | Real estate | 2024 |
| KRS Legal Ltd | Professional & scientific | 2024 |
| KRS Networking Ltd | Administrative & support | 2022 |
| KS Global Services Ltd | Wholesale & retail | 2021 |
| KS3 Limited | Hospitality | 2024 |
| KSD (Contracts) Limited | Water & waste | 1992 |
| KSH Associates Limited | Professional & scientific | 2026 |
| Ktes Ltd | Information & communication | 2022 |
| Kukes Eco Ltd | Real estate | 2023 |
| Kumarketaccess Ltd | Professional & scientific | 2023 |
| Kumis Kitchen Ltd | Hospitality | 2023 |
| Kumo Properties Holdings Limited | Financial services | 2023 |
| Kumo Properties Limited | Real estate | 2023 |
| KUZ Enterprise Ltd | Wholesale & retail | 2026 |
| Kyle Developments Ltd | Construction | 2025 |
| KZ Suplik Ltd | Other services | 2021 |
| L & J Display Limited | Professional & scientific | 2000 |
| L C Construction Limited | Construction | 2003 |
| L K O Holdings Limited | Financial services | 2017 |
| L L T O Ltd | Financial services | 2026 |
| L S Carter Limited | Real estate | 2014 |
| L&D Varodi Ltd | Wholesale & retail | 2023 |
| L&M Transport Services Ltd | Professional & scientific | 2022 |
| L.W. Motors 1ST Car Specialists Ltd | Wholesale & retail | 2020 |
| LA Cucina Grill Ltd | Hospitality | 2020 |
| LA Donna Ltd | Hospitality | 2025 |
| LA Fierbint Ltd | Wholesale & retail | 2025 |
| LA Mortgage Services Ltd | Financial services | 2023 |
| LA Trans Ltd | Transport & logistics | 2016 |
| Labamm Limited | Health & social care | 2017 |
| Label AID Ltd | Manufacturing | 2006 |
| LAC Contracting Ltd | Wholesale & retail | 2024 |
| Laceys Lets Limited | Real estate | 2017 |
| Lacr Property Holdings Limited | Financial services | 2023 |
| Lady Fayre Slippers Limited | Wholesale & retail | 2011 |
| Ladybee Holdings Ltd | Financial services | 2025 |
| Ladybee Ltd | Real estate | 2025 |
| Ladybirds Leicester Ltd | Arts & recreation | 2003 |
| Laex TAN Wholesale Supply Ltd | Wholesale & retail | 2019 |
| LAJ Media Ltd | Information & communication | 2026 |
| Lake Cafe Ltd. | Wholesale & retail | 2013 |
| Lakes Contract Engineering Ltd | Professional & scientific | 2022 |
| Lakshmi & Son's Limited | Manufacturing | 2002 |
| LAM 4 Care Ltd | Health & social care | 2025 |
| Lammas Harrison Property Management Ltd | Real estate | 2023 |
| Lanamaria Limited | Construction | 2020 |
| Landmark Creations Limited | Construction | 2025 |
| Landmark Global Pathways Ltd | Education | 2025 |
| Lanemark Combustion Engineering Limited | Manufacturing | 2005 |
| Lanemark Holdings Limited | Financial services | 2024 |
| Lanemark International Limited | Extraterritorial | 1981 |
| Lara Furmidge Education Support Limited | Education | 2022 |
| Larman Sports Solutions Limited | Professional & scientific | 2022 |
| Larpent Securities Limited | Real estate | 1996 |
| Lasota Trans Ltd | Transport & logistics | 2016 |
| Last Mile Transport Ltd | Transport & logistics | 2025 |
| Last Run of the Day Time Ltd | Transport & logistics | 2022 |
| Latesco Limited | Financial services | 2020 |
| Latitude Homes Ltd | Real estate | 2024 |
| Latviasgotalent Ltd | Professional & scientific | 2022 |
| Launch PAD Media Ltd | Professional & scientific | 2019 |
| Laur&Son Ltd | Transport & logistics | 2019 |
| Laura Lancashire Ltd | Real estate | 2024 |
| Laveer Developments Limited | Real estate | 2022 |
| Lawley Projects Limited | Construction | 2020 |
| Lawley's Property Services Ltd | Construction | 2019 |
| Lawns 'N' Roses Ltd | Administrative & support | 2013 |
| Lawrence Orton Holdings Limited | Real estate | 2022 |
| Laws Cars Ltd | Wholesale & retail | 2024 |
| Lawson Tamplin Holdings Ltd | Financial services | 2018 |
| Lazar-Coman Ltd | Transport & logistics | 2025 |
| Lazy Daisy Ltd | Wholesale & retail | 2022 |
| LB Fashion Limited | Wholesale & retail | 2022 |
| LB Holdings and Investments Ltd | Financial services | 2024 |
| LB Medical Training Ltd | Education | 2025 |
| LC Brickwork and Repointing Ltd | Construction | 2026 |
| LC Enterprises Midlands Ltd | Hospitality | 2023 |
| Ldbf Properties Ltd | Real estate | 2023 |
| Ldbf Real Estate Ltd | Construction | 2024 |
| LDJ Solicitors LLP | | 2015 |
| Ldmk Properties Limited | Real estate | 2024 |
| Ldmk Software Solutions Ltd | Information & communication | 2019 |