| Karsam Ltd | Real estate | 2026 |
| KAS Electrics Ltd | Construction | 2016 |
| Kasgur Metals Ltd | Water & waste | 2021 |
| Kate Rose Morris Limited | Arts & recreation | 2013 |
| Katie's Properties Ltd | Real estate | 2024 |
| Kavanagh Investments Ltd | Real estate | 2018 |
| Kavod Consulting Ltd | Professional & scientific | 2024 |
| Kavyaashna Ltd | Real estate | 2018 |
| Kawai Consulting Limited | Administrative & support | 2014 |
| Kay-Aish Ltd | Real estate | 2026 |
| Kaya - Olgac Ltd | Hospitality | 2019 |
| Kaya Smile Estates Limited | Real estate | 2018 |
| Kaya SPV Limited | Real estate | 2025 |
| Kaya’S Roots Ltd | Real estate | 2026 |
| Kaygisiz Limited | Hospitality | 2020 |
| Kaywan Barber Shop Ltd | Other services | 2024 |
| KB Mastic and Sealants Ltd | Construction | 2025 |
| Kchl Ltd | Professional & scientific | 2022 |
| Kcompass Solutions Limited | Real estate | 2010 |
| KD Fitness Group Ltd | Arts & recreation | 2025 |
| KD Motors Limited | Wholesale & retail | 2022 |
| KDB North Ltd | Construction | 2014 |
| KE Diaspora Limited | Administrative & support | 2020 |
| Kedsun Limited | Real estate | 2023 |
| Keene Contracts Ltd | Construction | 2019 |
| Keene Flooring Limited | Construction | 2017 |
| Keilty Ltd | Administrative & support | 2017 |
| Keith Wilson Limited | Real estate | 2013 |
| Kelly Utilities Ltd | Construction | 2021 |
| Kemmy Foods UK Limited | Wholesale & retail | 2025 |
| Kennedy & Jones Ltd | Construction | 2018 |
| Kensington Holdings (London) Ltd | Real estate | 2026 |
| Kent & Kent Management UK Ltd | Real estate | 2025 |
| Kent City UK Ltd | Real estate | 2024 |
| Kerala Food Cart Ltd | Wholesale & retail | 2025 |
| Kevin Nails Ltd | Other services | 2022 |
| Key Tech Autokey Ltd | Manufacturing | 2023 |
| Keyco Partners Ltd | Administrative & support | 2025 |
| Keycor Construction Ltd | Construction | 2024 |
| Keywatch 24/7 Limited | Households | 2025 |
| KH Pharm Limited | Health & social care | 2022 |
| Khan Properties 46 Ltd | Real estate | 2026 |
| Khuba Limited | Manufacturing | 2018 |
| KID at Heart Collectibles Ltd | Wholesale & retail | 2026 |
| Kiki Rosa Ltd | Other services | 2021 |
| Kikksofficial Ltd | Wholesale & retail | 2022 |
| Kilincmen Limited | Hospitality | 2024 |
| Killick Properties Limited | Real estate | 2026 |
| Kilns (Reed) Management Company Limited | Households | 2018 |
| KIN Properties & Lettings Ltd | Real estate | 2023 |
| Kinchlea HR Consultants Ltd | Professional & scientific | 2016 |
| Kindred Grove Homes Ltd | Health & social care | 2025 |
| Kingdom Global Estate Ltd | Professional & scientific | 2023 |
| Kingston Road (2) Management Company Limited | Real estate | 2020 |
| Kingswater Place Freehold Limited | Households | 2021 |
| Kink Hair and Beauty Limited | Other services | 2024 |
| Kirasa Ltd | Real estate | 2022 |
| Kirigram Limited | Information & communication | 2008 |
| Kirve Limited | Hospitality | 2017 |
| Kismaayo Ltd | Health & social care | 2022 |
| Kismet by Milka Limited | Wholesale & retail | 2023 |
| KIT Supply Limited | Wholesale & retail | 2018 |
| Kits Coty Stud Limited | Agriculture & fishing | 2010 |
| Kits Healthcare Limited | Health & social care | 2019 |
| KIV22 Limited | Transport & logistics | 2022 |
| Kivs Properties Ltd | Real estate | 2026 |
| KJ Cadbury Ltd | Information & communication | 2010 |
| KJK Homes Ltd | Real estate | 2025 |
| Kk-Kumite Ltd | Transport & logistics | 2016 |
| Kkbrown Ltd | Transport & logistics | 2025 |
| KKH Construction Ltd | Construction | 2021 |
| KKS Cafe Bar Grill Limited | Hospitality | 2019 |
| KKS Capital Developments Limited | Real estate | 2017 |
| KLA Property Ltd | Real estate | 2021 |
| Kleinworth & Young Limited | Information & communication | 2017 |
| Knaggs Limited | Wholesale & retail | 2002 |
| Knightsbury Properties Limited | Real estate | 2025 |
| KNM & Sons Transport Solutions Limited | Transport & logistics | 2025 |
| Koala Strategy Ltd | Professional & scientific | 2022 |
| Kobyx Limited | Real estate | 2024 |
| Kolyon Property Ltd | Real estate | 2026 |
| Koncrete Media Ltd | Information & communication | 2025 |
| Konkonex Ocean Cleaning Ltd | Administrative & support | 2024 |
| Konny Rose Living Ltd | Hospitality | 2023 |
| Konstructly Ltd | Information & communication | 2021 |
| Kontes Ltd | Hospitality | 2025 |
| Kool Kids Fest Limited | Arts & recreation | 2019 |
| Kothari Digital Ltd | Information & communication | 2019 |
| KP Building Engineering Ltd | Construction | 2012 |
| KP Commercial Investments Ltd | Real estate | 2023 |
| KSI Properties Ltd | Information & communication | 2019 |
| KSO Hair and Beauty Ltd | Other services | 2026 |
| Ktlp Limited | Wholesale & retail | 2020 |
| Kttyworld Gaming Solutions Ltd | Manufacturing | 2025 |
| Kucuk UK Ltd | Transport & logistics | 2010 |
| Kuka Foodscope Consultancy Ltd | Hospitality | 2019 |
| Kupa Builders Ltd | Construction | 2024 |
| Kurbside Services Ltd | Transport & logistics | 2025 |
| Kurros Limited | Information & communication | 2016 |
| Kutay Group Ltd | Construction | 2020 |