| Knight Precision Engineering Limited | Manufacturing | 2022 |
| Knight Wheeler Sanson Limited | Professional & scientific | 2019 |
| Knighton Care Services Limited | Health & social care | 2017 |
| Knights Property Limited | Real estate | 2018 |
| Know US Limited | Professional & scientific | 2008 |
| Knowledge Based Trading Ltd | Administrative & support | 2026 |
| Knowles Communications Ltd | Professional & scientific | 2017 |
| KO Deli Limited | Hospitality | 2017 |
| Ko-Re Ko-Re (UK) Ltd | Wholesale & retail | 2023 |
| KOA Creatives Limited | Construction | 2015 |
| Koffe Ltd | Hospitality | 2014 |
| Kofio Ltd | Wholesale & retail | 2018 |
| Koldo & Co Limited | Professional & scientific | 2010 |
| Kome Chigwell Limited | Wholesale & retail | 2021 |
| Kome International Limited | Hospitality | 2015 |
| Kome OL Ltd | Financial services | 2021 |
| Komola Collective CIC | Education | 2018 |
| Koselev Team Limited | Manufacturing | 2024 |
| Kosev Group Limited | Construction | 2021 |
| Kosev Ltd | Construction | 2021 |
| KOY Limited | Extraterritorial | 2005 |
| KOY Properties Ltd | Extraterritorial | 2005 |
| KP & RP Consultancy Limited | Professional & scientific | 2019 |
| KRB Mortgages Limited | Financial services | 2021 |
| Krescendo Records Limited | Administrative & support | 2006 |
| Krestbay Limited | Real estate | 2016 |
| Krett Ltd | Professional & scientific | 2025 |
| Kris Capital Limited | Construction | 2017 |
| Krishna Distributors Limited | Wholesale & retail | 2026 |
| Krishnan & Co. Advisory Limited | Information & communication | 2024 |
| Kristal Kiani Property Developments Limited | Real estate | 2009 |
| Kristiana Margret Ltd | Manufacturing | 2020 |
| Krlg Ltd | Professional & scientific | 2023 |
| Ksfh Holdings Limited | Real estate | 2025 |
| Kshak Limited | Financial services | 2018 |
| KSP Gisborne Limited | Professional & scientific | 2025 |
| KSP Solutions Services Ltd | Professional & scientific | 2018 |
| KTM Storage Ltd | Transport & logistics | 2024 |
| Ktoo Limited | Administrative & support | 2024 |
| KTP Deliveries Limited | Wholesale & retail | 2019 |
| Kube Research Ltd. | Professional & scientific | 2017 |
| Kudla Builders Ltd | Construction | 2025 |
| Kulz Prescribing Services Ltd | Health & social care | 2022 |
| Kumar Consulting Group Limited | Information & communication | 2021 |
| Kupas Toras Chesed Ltd | Health & social care | 2020 |
| Kurchii Construction Ltd | Construction | 2016 |
| Kureya Holdings Limited | Financial services | 2022 |
| Kwasi DB Limited | Information & communication | 2026 |
| Kyng Properties Limited | Real estate | 2022 |
| Kynry Ltd | Financial services | 2021 |
| Kyria Houses Ltd | Real estate | 2020 |
| KZ Shanghai Ltd | Hospitality | 2021 |
| L Greenberg Limited | Administrative & support | 2018 |
| L J Waldman Limited | Administrative & support | 2018 |
| L K Fire and Security Limited | Construction | 2025 |
| L K Fire Limited | Construction | 2016 |
| L S F Builders Limited | Construction | 2019 |
| L&H Assets Limited | Real estate | 2024 |
| L&K Estates Limited | Real estate | 2021 |
| L&K Estates Portfolio Limited | Real estate | 2022 |
| L'Amore Property Ltd | Real estate | 2019 |
| L.E.A Electrical Contractors Ltd | Construction | 2023 |
| L.M.T. Decorators Ltd | Construction | 2024 |
| L.U.K. Services Ltd | Construction | 2025 |
| L.W. Metson & Co Limited | Other services | 1958 |
| LA Capital Ventures Limited | Financial services | 2020 |
| LA Danse Limited | Other services | 2019 |
| LA Global Services Ltd | Public administration | 2022 |
| LA Marino Ltd | Hospitality | 2026 |
| LA Raja Holdings Limited | Financial services | 2020 |
| LA Vanatorul Limited | Wholesale & retail | 2020 |
| Laac Ltd | Other services | 2021 |
| Laces Sports Management Limited | Arts & recreation | 2026 |
| Lachev Ltd | Construction | 2015 |
| Ladbroke Audio Limited | Information & communication | 2011 |
| Ladbroke Productions (Radio) Limited | Administrative & support | 1975 |
| Lafontaine Public Relations Ltd. | Professional & scientific | 2017 |
| Laine Property Limited | Real estate | 2021 |
| Lajoll Holdings Limited | Financial services | 2021 |
| Lajoll Limited | Real estate | 2015 |
| Lajoll Residential Limited | Real estate | 2021 |
| LAK Construction Ltd | Construction | 2016 |
| Lakeshore Enterprises Limited | Real estate | 2024 |
| Lakeview Cafe and Kitchen Ltd | Hospitality | 2026 |
| Laks Data Consulting Ltd | Professional & scientific | 2025 |
| Lambano Care Ltd | Health & social care | 2021 |
| Lamp Catering Limited | Hospitality | 2024 |
| LAN Sun Ltd | Hospitality | 2025 |
| Lancaster Plant (Hire & Sales) Limited | Construction | 1985 |
| Lancehead Limited | Information & communication | 2017 |
| Landaware Limited | Financial services | 2021 |
| Landview Management Ltd | Real estate | 2012 |
| Lanext Group Investments Ltd | Real estate | 2022 |
| Lantern Tutors Limited | Education | 2023 |
| Lantracy Development Group Limited | Construction | 1961 |
| Laptop Outlet Limited | Wholesale & retail | 2019 |
| Larsen-Robert & Associates Limited | Hospitality | 2021 |
| Laryea Futures Ltd | Information & communication | 2026 |
| LAS Nubes Property Limited | Real estate | 2025 |
| Laser Salon Ltd | Other services | 2014 |