| Kents Orchard Limited | Households | 2017 |
| Kerensa Rose Ltd | Professional & scientific | 2017 |
| Kerim Catering Ltd | Hospitality | 2020 |
| Kermodei Ltd | Construction | 2017 |
| Kerrglen House RTM Company Limited | Households | 2020 |
| Keswood Ltd | Real estate | 2024 |
| Keswoodsparks Ltd | Energy | 2014 |
| Kevan Drive Limited | Real estate | 2015 |
| Kevin Anthony Construction Ltd | Construction | 2011 |
| Kevin Homes Limited | Construction | 2025 |
| Keybourne Limited | | 1977 |
| Keymailrecords Ltd | Wholesale & retail | 2000 |
| Keytask Management Limited | Administrative & support | 2003 |
| KFL Services Limited | Professional & scientific | 2015 |
| KFS Media Limited | Information & communication | 2014 |
| KGA Solutions Ltd | Other services | 2019 |
| KGS Associates Limited | Administrative & support | 2003 |
| KH and Co Investments Limited | Real estate | 2019 |
| Khatana Properties Ltd | Real estate | 2024 |
| Khera Property Investments Limited | Real estate | 2016 |
| Kiany Law Chambers Ltd | Professional & scientific | 2024 |
| Kilbricken Enterprises Limited | Real estate | 1993 |
| Kildare Nominees Limited | Professional & scientific | 2012 |
| Killy & Co Design Ltd | Wholesale & retail | 2020 |
| Kilns Management Limited(The) | Households | 1987 |
| Kimani Group Holdings Limited | Professional & scientific | 2024 |
| Kincraig Construction,Limited | Construction | 1971 |
| Kindigital Ltd | Information & communication | 2011 |
| Kinergetic Consulting Ltd | Real estate | 2011 |
| Kinetic Goods Ltd | Wholesale & retail | 2025 |
| King George's Lodge Management Company Limited | Households | 2014 |
| King Georges Lodge RTM Company Limited | Households | 2015 |
| Kings Ridge Management Company Limited | Households | 2018 |
| Kingsbury Gifts Ltd | Wholesale & retail | 2018 |
| Kingscombe Estates Limited | Real estate | 2015 |
| Kingspark Electrical Services Limited | Administrative & support | 2019 |
| Kingswood Management Company Limited | Households | 1987 |
| Kirk H Taylor Ltd | Professional & scientific | 2025 |
| Kispe Ltd | Professional & scientific | 2016 |
| Kispe Space Systems Ltd | Manufacturing | 2018 |
| KIT Direct Limited | Wholesale & retail | 1997 |
| KIT MCN Ltd | Wholesale & retail | 2023 |
| Kitchen Sink Productions CIC | Education | 2023 |
| Kitchen Sprayer Ltd | Construction | 2021 |
| Kite Homes Ltd | Real estate | 2026 |
| KJB Project Management Ltd | Professional & scientific | 2024 |
| KJM Print Solutions Limited | Administrative & support | 2016 |
| KKC Services Ltd | Administrative & support | 2026 |
| Klearyc Limited | Administrative & support | 2024 |
| Klectic Solutions Limited | Professional & scientific | 2014 |
| Klevis Contractors Ltd | Construction | 2017 |
| Klevis Investments Ltd | Real estate | 2025 |
| Klink Golf Ltd | Manufacturing | 2022 |
| KMC Fitness Limited | Arts & recreation | 2021 |
| KMT Rising Ltd | Health & social care | 2021 |
| KN Consulting & Innovation Ltd | Information & communication | 2025 |
| Kner Limited | Wholesale & retail | 2024 |
| Knight Protection Limited | Other services | 1998 |
| Knight Security Limited | Other services | 2015 |
| Knights Management Consulting Ltd | Financial services | 2014 |
| Knights Recruitment Solutions Limited | Administrative & support | 2024 |
| Knights Security Limited | Professional & scientific | 2012 |
| Knights Services Limited | Real estate | 2020 |
| Knights Training Academy Limited | Education | 2008 |
| Knightsky Aerials Ltd | Information & communication | 2020 |
| KNP Catering Limited | Hospitality | 2012 |
| KNT Family Holdings Limited | Administrative & support | 2022 |
| KOI Sushi Ltd | Hospitality | 2021 |
| Koko Studio Limited | Professional & scientific | 2014 |
| Kommetjie Logistics Ltd | Transport & logistics | 2026 |
| Koolcreations Limited | Construction | 2022 |
| Koomgroups Ltd | Manufacturing | 2026 |
| Koosa Properties Ltd | Real estate | 2012 |
| Kopiccy Holdings Ltd | Financial services | 2026 |
| Kosmos MTM Limited | Wholesale & retail | 2025 |
| Kozak Transport Ltd | Transport & logistics | 2017 |
| Kqms Consulting Ltd | Professional & scientific | 2024 |
| Kras Holdings Ltd | Real estate | 2025 |
| Kriloha Ltd | Wholesale & retail | 2009 |
| Krishna CTN Ltd | Wholesale & retail | 2013 |
| Krishtha Limited | Information & communication | 2013 |
| Krispy Kreme Holding UK Ltd | Financial services | 2016 |
| Krispy Kreme U.K. Limited | Manufacturing | 2002 |
| Kritchanat Ltd | Hospitality | 2024 |
| KRY Limited | Wholesale & retail | 2023 |
| KSB Electrical, Plumbing and Heating Ltd | Construction | 2021 |
| KSB Property Group Ltd | Real estate | 2025 |
| KSM Cars Basingstoke Limited | Extraterritorial | 2021 |
| Ksmemm Holdings Limited | Real estate | 2025 |
| KSN Solicitors Ltd | Professional & scientific | 2010 |
| KSN Trading Limited | Wholesale & retail | 2025 |
| KT Beauty Boutique Ltd | Other services | 2022 |
| KT Homes & Property Ltd | Real estate | 2025 |
| KTM Property Ltd | Real estate | 2023 |
| Ktmmart Ltd | Wholesale & retail | 2025 |
| Ktoris Designs Ltd | Professional & scientific | 2017 |
| KTR Trading Limited | Professional & scientific | 2019 |
| Kukon Consulting Ltd | Information & communication | 2019 |
| Kumiku Limited | Information & communication | 2007 |
| Kuthi Limited | Real estate | 2024 |