| KRM Goods Ltd | Transport & logistics | 2013 |
| KRM Traders Ltd | Wholesale & retail | 2025 |
| Kroll Montts Ltd | Information & communication | 2026 |
| KRS Homes Ltd | Real estate | 2023 |
| KRS Windows Ltd | Construction | 2024 |
| Krupnik Polish (Acton) Ltd | Wholesale & retail | 2026 |
| Krust & Flame Ltd | Hospitality | 2025 |
| Krystal Care Children’S Services Ltd | Health & social care | 2024 |
| KS Builds and Design Limited | Construction | 2025 |
| KS Dhillon Readymix Concrete Ltd | Manufacturing | 2026 |
| KS Gadgets Limited | Wholesale & retail | 2025 |
| Ks&Gk Trading Ltd | Wholesale & retail | 2021 |
| Ks-Maths Tuition & IT Supports Ltd | Information & communication | 2012 |
| KSB Finance Ltd | Professional & scientific | 2019 |
| Kshk Transport Ltd | Transport & logistics | 2022 |
| KSM Kingston Limited | Real estate | 2014 |
| KSM Valeting & Detailing Ltd | Other services | 2022 |
| Ksoft Technologies Limited | Information & communication | 2014 |
| Ksrub Transport Ltd | Transport & logistics | 2025 |
| KSW Veritas Ltd | Construction | 2026 |
| KT Pizza Limited | Hospitality | 2025 |
| KTG Decorators Ltd | Construction | 2018 |
| KTP Traders Ltd | Construction | 2025 |
| KTS Plastering and Painting Ltd | Construction | 2023 |
| KTS Recruitment Services Ltd | Administrative & support | 2023 |
| KTT Transport Ltd | Construction | 2022 |
| Kubberlaxmi Limited | Financial services | 2014 |
| Kubera Core Ltd | Real estate | 2025 |
| Kuci MAX Construction Ltd | Construction | 2023 |
| Kudathanai Kodeeswaran Ltd | Real estate | 2021 |
| Kukus Food & Packaging Ltd | Wholesale & retail | 2021 |
| Kulcha Express Southall Ltd | Hospitality | 2019 |
| Kulcha Station Ltd | Hospitality | 2020 |
| Kullar Brothers Kitchens and Wardrobes Ltd | Manufacturing | 2024 |
| KULWINDER044 Ltd | Households | 2024 |
| Kundhal Steel & Fabrication Ltd | Construction | 2025 |
| Kung FU World Centre of Learning LLP | | 2019 |
| Kung FU World Ltd | Extraterritorial | 2014 |
| Kunrans Engineering and Construction Limited | Construction | 2026 |
| Kupu Holistic Ltd | Health & social care | 2021 |
| Kurrow Limited | Wholesale & retail | 2026 |
| Kutchen Studio and Bedroom Ltd | Manufacturing | 2025 |
| Kuuzy B Music Ltd | Information & communication | 2020 |
| Kveer Construction Ltd | Construction | 2025 |
| Kvirdi Ltd | Construction | 2026 |
| Kwik Cleaning Ltd | Administrative & support | 2022 |
| KZ Global Services Limited | Transport & logistics | 2024 |
| KZM Ltd | Hospitality | 2017 |
| L J Branch & Associates Ltd | Professional & scientific | 2006 |
| L J Branch Property Investments Ltd | Real estate | 2020 |
| L R Design & Construction Ltd | Construction | 2020 |
| L Toba Ltd | Construction | 2019 |
| L&A Brothers Trading Limited | Hospitality | 2023 |
| L'Atelier Patchouli Dentaire Ltd | Health & social care | 2021 |
| L'Atelier Patchouli Property Ltd | Real estate | 2021 |
| L.A. Accountants Ltd | Professional & scientific | 2016 |
| L.G-Serv Ltd | Transport & logistics | 2018 |
| L2L Haulage Ltd. | Transport & logistics | 2016 |
| LA Commerce Ltd | Wholesale & retail | 2026 |
| LA Plaza World Ltd | Wholesale & retail | 2020 |
| LA Roma Pizza (Hayes) Ltd | Hospitality | 2024 |
| LA Ventura Properties Limited | Real estate | 2022 |
| LA Vinci Ltd | Wholesale & retail | 2019 |
| La-Mack Enterprise Ltd | Transport & logistics | 2012 |
| Lace and Brace Ltd | Construction | 2026 |
| Ladylights Golden Operations Ltd | Information & communication | 2016 |
| LAH Enterprises Limited | Health & social care | 2021 |
| Lahri Construction Ltd | Construction | 2025 |
| LAJ Associates Ltd | Administrative & support | 2025 |
| LAJ Ecom Logistics Ltd | Transport & logistics | 2021 |
| Laki Trading Ltd | Wholesale & retail | 2025 |
| Laksz Cleaning Ltd | Administrative & support | 2025 |
| LAL Builders Ltd | Construction | 2022 |
| Lala Exports Ltd | Wholesale & retail | 2020 |
| Lamba London Limited | Wholesale & retail | 2024 |
| Lamba Property Investments Limited | Real estate | 2015 |
| Lamba Super Store Ltd | Wholesale & retail | 2025 |
| Lamber & Co Limited | Professional & scientific | 2020 |
| Lancer Express Services UK Ltd | Transport & logistics | 2017 |
| Land & Key Investments Ltd | Real estate | 2021 |
| Land Clay Properties and Investment Limited | Real estate | 2022 |
| Land Master Constructions Limited | Construction | 2022 |
| Landlord Connect Limited | Households | 2019 |
| Landmark Commercial Cleaning Ltd | Administrative & support | 2021 |
| Landmark Development Solutions Limited | Real estate | 2025 |
| Landmark Heating Group Ltd | Construction | 2023 |
| Landmark Solutions Ltd | Real estate | 2021 |
| Lands Between Limited | Wholesale & retail | 2024 |
| Lanesra Services Ltd | Construction | 2024 |
| Langley Kitchens Ltd | Manufacturing | 2021 |
| Langside Freight Services Ltd | Transport & logistics | 2025 |
| Language Programs Ltd | Education | 2015 |
| Lansdowne Housing Community Interest Company | Health & social care | 2024 |
| Lara B Ltd | Administrative & support | 2014 |
| Larchguild Limited | Real estate | 1999 |
| Lash Hair & Beauty Ltd | Other services | 2017 |
| Laska Group Ltd | Professional & scientific | 2021 |
| Lateef Healthcare Limited | Health & social care | 2016 |
| Lauder Teacher Associates Limited | Professional & scientific | 2024 |
| Laur IV Limited | Transport & logistics | 2019 |