| Kristal Enterprises Limited | Real estate | 2000 |
| Kritisha & Singh Ltd | Information & communication | 2018 |
| Krkb Engineering Ltd | Manufacturing | 2023 |
| KRL Plumbing and Heating Ltd | Construction | 2024 |
| Krocodile Innovative Solutions Limited | Wholesale & retail | 2019 |
| Krofai Limited | Health & social care | 2025 |
| Kronos Management Limited | Other services | 1993 |
| Krown Empire Limited | Transport & logistics | 2009 |
| KRS London Holdings Limited | Wholesale & retail | 2024 |
| Krupa Management Company Limited | Households | 2004 |
| Krupa Retail Ltd | Wholesale & retail | 2019 |
| Krus DEN Ltd | Real estate | 2021 |
| Kryf Social Ltd | Households | 2025 |
| Krysn Limited | Wholesale & retail | 2026 |
| KRZ Solutions Ltd | Information & communication | 2025 |
| KS Accountancy Services Limited | Professional & scientific | 2024 |
| KS Flooring Services Limited | Construction | 2019 |
| KS Rendez-Vous Ltd | Hospitality | 2009 |
| KSA Enterprises Limited | Construction | 2014 |
| KSA Property Holdings Limited | Administrative & support | 2007 |
| KSA Property Management Limited | Other services | 2020 |
| KSA Property Management Services Limited | Administrative & support | 2021 |
| KSB Law Consultants Limited | Professional & scientific | 2005 |
| KSD Properties Group Ltd | Real estate | 2022 |
| Kshitij Akshay Limited | Professional & scientific | 2003 |
| KSK Catering Ltd | Hospitality | 2024 |
| KSM B2B Services Ltd | Wholesale & retail | 2017 |
| KSO Foods Ltd | Hospitality | 2025 |
| Ksrr Retail Ltd | Wholesale & retail | 2026 |
| KSS Catering Ltd | Hospitality | 2014 |
| KSS Construction Ltd | Construction | 2022 |
| KT BN13 Ltd | Construction | 2025 |
| KT Frame Solutions Ltd | Construction | 2020 |
| KT Performance Cars Limited | Wholesale & retail | 2022 |
| KT PO21 Ltd | Construction | 2025 |
| KT1 Management Co. Ltd | Households | 2016 |
| KTC Group Ltd | Wholesale & retail | 2015 |
| Ktej Limited | Real estate | 2025 |
| KTG Limited Liability Partnership | | 2007 |
| KTM Business Services Ltd | Professional & scientific | 2009 |
| KTS73 Ltd | Construction | 2012 |
| KTT Properties Ltd | Real estate | 2023 |
| KUB3 Ltd | Construction | 2014 |
| Kubajpur Welfare UK Ltd | Other services | 2022 |
| Kubera Properties Ltd | Real estate | 2017 |
| Kuberansdor Limited | Wholesale & retail | 2024 |
| Kubit Ltd | Manufacturing | 2016 |
| Kudovera Services Limited | Professional & scientific | 2019 |
| Kukaj & Co. Ltd | Hospitality | 2025 |
| Kul's Kitchen Limited | Real estate | 2013 |
| Kulachi Ltd | Professional & scientific | 2024 |
| Kuma IT Solutions Limited | Information & communication | 2024 |
| Kumah Estates Ltd | Real estate | 2020 |
| Kumar Builders (London) Limited | Construction | 2023 |
| Kumari Byford Properties Limited | Real estate | 2025 |
| Kumo Resourcing Limited | Professional & scientific | 2014 |
| KUN Foods Ltd. | Hospitality | 2019 |
| Kunathu Ltd | Construction | 2026 |
| Kundansai Limited | Wholesale & retail | 1993 |
| Kung FU Schools (Bromley) LLP | | 2016 |
| Kuromi Business Service Limited | Professional & scientific | 2025 |
| Kuron Ltd | Information & communication | 2023 |
| Kurroc Limited | Manufacturing | 2020 |
| Kurst Ltd | Information & communication | 2013 |
| Kurupaz Builders Ltd | Construction | 2021 |
| Kushy Move Limited | Real estate | 2002 |
| Kuyper Family Limited | Extraterritorial | 2023 |
| Kuze Living Limited | Hospitality | 2025 |
| Kuzu Catering Ltd | Hospitality | 2026 |
| KV Greens Ltd | Agriculture & fishing | 2024 |
| KVS Global Ltd | Wholesale & retail | 2022 |
| KW Meds Ltd | Wholesale & retail | 2023 |
| Kween KFM International Ltd | Agriculture & fishing | 2024 |
| Kwick Cars Limited | Transport & logistics | 2018 |
| Kwik Accident Claim Helpline Limited | Professional & scientific | 2009 |
| KWK Trust | Health & social care | 2017 |
| Kwong Aesthetics Ltd | Health & social care | 2023 |
| KYM Transcript Limited | Wholesale & retail | 2020 |
| Kyra Store Limited | Wholesale & retail | 2019 |
| KZV Property Holdings Ltd | Real estate | 2025 |
| L & B Trust | Construction | 2016 |
| L & Dukes Fruit Produce Ltd | Wholesale & retail | 2019 |
| L & H Trading Ltd | Wholesale & retail | 2018 |
| L & M Construction Developers Ltd | Construction | 2025 |
| L & W Services Limited | Health & social care | 2019 |
| L & Y Enterprise Ltd | Hospitality | 2010 |
| L a News Limited | Wholesale & retail | 2010 |
| L Aryee Ltd | Health & social care | 2024 |
| L E Welland Limited | Construction | 2015 |
| L R TEC Ltd | Construction | 2022 |
| L W M Plastering Ltd | Construction | 2015 |
| L&A Property Ventures Ltd | Real estate | 2025 |
| L&R Property Group Ltd | Real estate | 2025 |
| L-Sol-T (London Solution Trade) Limited | Construction | 2024 |
| L-Technology Ltd | Wholesale & retail | 2020 |
| L-Vis Moving Ltd | Transport & logistics | 2024 |
| L.A Leisure London Ltd | Hospitality | 2025 |
| L.K Carpenter & Builder Ltd | Construction | 2021 |
| L.M Harkins Limited | Arts & recreation | 2018 |
| LA Amazonas Ltd | Wholesale & retail | 2019 |