| Kohli Construction Ltd | Construction | 2024 |
| Koko Loko Ltd | Wholesale & retail | 2026 |
| Kola Property Limited | Households | 2024 |
| Kola Windows Installations Limited | Construction | 2023 |
| Konbuild Render Service Ltd | Construction | 2021 |
| Konect IT Ltd | Construction | 2016 |
| Konekt Media House Ltd | Information & communication | 2020 |
| Konnecthu Ltd | Information & communication | 2026 |
| Kool Cakes Bakery Ltd | Wholesale & retail | 2008 |
| Kooner Enterprises Ltd | Real estate | 2024 |
| Korai Health Ltd | Wholesale & retail | 2023 |
| Kosima Ltd | Wholesale & retail | 2026 |
| Kostaa Limited | Manufacturing | 2018 |
| Koth Import and Export Ltd | Wholesale & retail | 2025 |
| Kottu MAX Ltd | Hospitality | 2025 |
| Kpjs Fish and Chips Limited | Hospitality | 2019 |
| KPS Electrical Services Ltd | Construction | 2019 |
| KPS Group Investments Ltd | Real estate | 2019 |
| KR Thames Valley Recruitment Ltd | Administrative & support | 2021 |
| Kreations Kube Ltd | Real estate | 2018 |
| Krez Rent Property Ltd | Real estate | 2020 |
| KRI Fashion UK Ltd | Wholesale & retail | 2026 |
| Kriative Windows Ltd | Construction | 2014 |
| Krishidhan Infotech Ltd | Wholesale & retail | 2025 |
| Krishna Perumal Healthcare Limited | Health & social care | 2017 |
| Krisz Consultancy Ltd | Other services | 2017 |
| Krovanta Ltd | Wholesale & retail | 2025 |
| Krrgc Ltd | Information & communication | 2011 |
| KRS Bhandal Ltd | Wholesale & retail | 2025 |
| Krup Foods Ltd | Hospitality | 2025 |
| Krup Tech Limited | Wholesale & retail | 2025 |
| Krzn Assets Limited | Real estate | 2025 |
| KS Brar Logistics Ltd | Transport & logistics | 2025 |
| KS Gold and Silver Jewellery Ltd | Wholesale & retail | 2023 |
| KSD Holding Investments Ltd | Real estate | 2025 |
| KSD Property Management Ltd | Real estate | 2023 |
| KSG Britain Ltd | Wholesale & retail | 2019 |
| Ksit Solutions Limited | Information & communication | 2010 |
| KSK Motors Ltd | Professional & scientific | 2024 |
| KSK Rbhl Limited | Information & communication | 2017 |
| KSL Technology Limited | Information & communication | 2010 |
| KSM Kumasi Solomons Money Ltd | Information & communication | 2026 |
| KSP PVT Ltd | Wholesale & retail | 2024 |
| Ksquare Groups UK Limited | Hospitality | 2025 |
| Ksquare IT Solutions Limited | Information & communication | 2022 |
| Kssr Ltd | Information & communication | 2025 |
| KT Commerce Ltd | Wholesale & retail | 2020 |
| KT Global Consulting Limited | Professional & scientific | 2023 |
| KT Pharma Ltd | Wholesale & retail | 2024 |
| KTS Energy Solutions Limited | Wholesale & retail | 2001 |
| Kube Homes UK Ltd | Real estate | 2009 |
| Kuber Digital Ltd. | Information & communication | 2016 |
| Kuber Digitech Ltd | Information & communication | 2019 |
| Kubershop Limited | Information & communication | 2021 |
| Kudus H Limited | Construction | 2018 |
| Kujawiak Hounslow Ltd | Wholesale & retail | 2020 |
| Kujawiak Hounslow Mini Market Ltd | Wholesale & retail | 2025 |
| Kukadia Property Investments Ltd | Construction | 2023 |
| Kukar & Co. Associates Limited | Professional & scientific | 2008 |
| Kukkeshree Technologies Ltd | Information & communication | 2011 |
| Kultar Ltd | Professional & scientific | 2012 |
| Kultrans Ltd | Transport & logistics | 2019 |
| Kulvi IT Service Limited | Information & communication | 2014 |
| Kumbara Builders Ltd | Construction | 2022 |
| Kumpikas Traders Ltd | Administrative & support | 2019 |
| Kundan Jewellery Ltd | Wholesale & retail | 2020 |
| Kunduz Gate Ltd | Wholesale & retail | 2019 |
| Kunip Technologies Ltd | Information & communication | 2012 |
| Kurdawar UK Limited | Manufacturing | 2025 |
| Kurdistan Delicacies Ltd | Hospitality | 2026 |
| Kurk Biosciences Ltd. | Manufacturing | 2020 |
| Kushbu Flowers Ltd | Wholesale & retail | 2022 |
| Kutir Estates Ltd | Real estate | 2021 |
| Kvik Capital Ltd | Financial services | 2024 |
| KVT Constructions Ltd | Construction | 2026 |
| KW Security Guard Ltd | Administrative & support | 2023 |
| Kwick Supplies Ltd | Administrative & support | 2013 |
| KYA Baat Ltd | Real estate | 2020 |
| Kyro Tech Ltd | Information & communication | 2025 |
| Kysam Limited | Wholesale & retail | 2018 |
| L & B Bros Transport Ltd | Transport & logistics | 2025 |
| L & J Care Services Ltd | Health & social care | 2024 |
| L & J Events UK Ltd | Wholesale & retail | 2024 |
| L G Transport Ltd | Transport & logistics | 2025 |
| L V Q Properties Limited | Real estate | 2007 |
| L&A Dealership Limited | Wholesale & retail | 2021 |
| L&B Delivery Ltd | Transport & logistics | 2018 |
| L&E Retail Ltd | Wholesale & retail | 2024 |
| L&H Inc Ltd | Wholesale & retail | 2024 |
| L&J Global Solutions Ltd | Wholesale & retail | 2022 |
| L&L Luxe Events & Hospitality Ltd | Hospitality | 2026 |
| L&P IT Contracting Ltd | Information & communication | 2019 |
| L.C. (Rivers House) Limited | Construction | 2014 |
| L3NSFLAR3 Limited | Professional & scientific | 2023 |
| L582 Ltd | Manufacturing | 2024 |
| LA Jawaab Hounslow Ltd | Hospitality | 2024 |
| LA Monica Shop Ltd | Wholesale & retail | 2026 |
| LA Nasu' Ltd | Hospitality | 2022 |
| Laasya Properties Ltd | Construction | 2019 |
| Ladbroke Phones Ltd | Wholesale & retail | 2025 |