| Kidzootd Limited | Professional & scientific | 2018 |
| Kidzootd Magazine Limited | Information & communication | 2018 |
| Kiely Transformative Growth Ltd | Professional & scientific | 2024 |
| Kieron Smith Limited | Construction | 2018 |
| Kigu Limited | Manufacturing | 2025 |
| Kimberley Victoria Events Ltd | Wholesale & retail | 2022 |
| Kimono Hair Company Ltd | Other services | 2005 |
| Kindora Homes Limited | Health & social care | 2024 |
| Kinetic Marketing Technology Ltd | Information & communication | 2020 |
| Kinetic Productions (UK) Limited | Information & communication | 2008 |
| Kinetic Speed Freight (Midlands) Ltd | Transport & logistics | 2026 |
| Kinetic Ventures Ltd | Wholesale & retail | 2022 |
| Kingdom Assets & Estates Limited | Real estate | 2020 |
| Kinghurst Securities Limited | Real estate | 1987 |
| Kinglux (UK) Ltd | Arts & recreation | 2011 |
| Kingsbury JIG & Tool Group Limited | Professional & scientific | 1957 |
| Kingsbury Property Investments Limited | Real estate | 2013 |
| Kingsbury School Sports Partnership CIC | Education | 2014 |
| Kingsbury Vehicle Services Ltd | Wholesale & retail | 2026 |
| Kingsmeade Construction Limited | Construction | 2023 |
| Kingstanding Properties Limited | Real estate | 1963 |
| Kinlock Properties Limited | Real estate | 2017 |
| Kinnect AI Limited | Financial services | 2024 |
| Kippford Solutions Limited | Information & communication | 2026 |
| Kiran Locums Ltd | Wholesale & retail | 2023 |
| Kirindol Developments (Meir) Limited | Construction | 2006 |
| Kirk Moore Accounting Limited | Professional & scientific | 2012 |
| Kitchen Flow Solutions Limited | Hospitality | 2024 |
| Kitchen Restorers Limited | Manufacturing | 2016 |
| Kitchens on TAP Limited | Other services | 2024 |
| Kittykat Retreat Ltd | Agriculture & fishing | 2026 |
| KJC Building Ltd | Construction | 2022 |
| KJS Midlands Constructions Ltd | Construction | 2024 |
| KK Business Services Ltd | Information & communication | 2025 |
| KK Products and Foams Limited | Manufacturing | 2011 |
| KL Training Academy Ltd | Education | 2022 |
| KLA Hospitality Limited | Professional & scientific | 2020 |
| KLA Investments Group Limited | Financial services | 2020 |
| Klinic&Co Boldmere and TBL Limited | Other services | 2025 |
| KM Property Developers Limited | Real estate | 2024 |
| Kmad Digital Ltd | Professional & scientific | 2023 |
| Kmbs 1 Limited | Hospitality | 2020 |
| Kmbs Group Limited | Financial services | 2020 |
| KN 88 Trading Limited | Hospitality | 2020 |
| KN Entertainment Ltd | Arts & recreation | 2021 |
| KNB Capital Ltd | Financial services | 2023 |
| Knight (Mossley) Limited | Manufacturing | 2002 |
| Knight Housing Care Limited | Health & social care | 2026 |
| Knight Housing CIC | Administrative & support | 2017 |
| Knightcote Property Limited | Construction | 2022 |
| Knighton Club Ltd | Hospitality | 2023 |
| Knighton Prestige Limited | Wholesale & retail | 2025 |
| Knighton Property Holdings Limited | Real estate | 2025 |
| Knighton Slater Limited | Professional & scientific | 2013 |
| Knituk Limited | Wholesale & retail | 2012 |
| Knot SO Typical Limited | Hospitality | 2022 |
| Knott Heart Health Limited | Health & social care | 2024 |
| Knowles & Madden Group Ltd | Financial services | 2026 |
| Knowles & Madden Ltd | Construction | 2010 |
| Knowles & Madden Property Limited | Construction | 2020 |
| Knox Cyber Security Limited | Administrative & support | 2017 |
| KNW Rental Homes Ltd | Real estate | 2023 |
| Kompass Housing & Management Ltd | Real estate | 2025 |
| Koolkal Services Limited | Manufacturing | 2018 |
| Kore Law Limited | Professional & scientific | 2020 |
| Korex Systems Ltd | Information & communication | 2026 |
| Kozi Limited | Wholesale & retail | 2025 |
| KP & AP Consulting Limited | Professional & scientific | 2022 |
| Kpad Estates UK Limited | Real estate | 2025 |
| KPD Cleaning Ltd | Administrative & support | 2021 |
| KPI (Holdings) Limited | Financial services | 2021 |
| KPT Property Estates Limited | Real estate | 2024 |
| KQ Ingram Ltd | Administrative & support | 2021 |
| Krangs Estates Limited | Real estate | 2025 |
| Krangs Limited | Health & social care | 2024 |
| Krao Properties Ltd | Real estate | 2023 |
| Krao Services Ltd | Health & social care | 2022 |
| Krauss Logistics Ltd | Transport & logistics | 2025 |
| KRE Portfolio Ltd | Real estate | 2026 |
| Kreuz Advisory Ltd | Professional & scientific | 2025 |
| Kreuz Capital Ltd | Real estate | 2020 |
| Krighton Electrical Ltd | Construction | 2025 |
| Krishn Limited | Real estate | 2019 |
| Kristin Spiers Ltd | Professional & scientific | 2022 |
| Krothe Properties Limited | Real estate | 2024 |
| KRR Limited | Information & communication | 2005 |
| KS Analytics Ltd | Professional & scientific | 2020 |
| KSV Enterprises Limited | Wholesale & retail | 2020 |
| KTK Consultancy Ltd | Professional & scientific | 2022 |
| KTM Electrical Ltd | Construction | 2015 |
| KTV Developments Limited | Real estate | 2025 |
| Kudsi Health Ltd | Health & social care | 2022 |
| Kudsi Limited | Real estate | 2012 |
| Kuhne & Heitz (UK) Ltd | Wholesale & retail | 1984 |
| Kuzuko Group Limited | Professional & scientific | 2019 |
| KV Valves Limited | Manufacturing | 2020 |
| KVK Supermarket Limited | Wholesale & retail | 2017 |
| KW Drafting Ltd | Professional & scientific | 2024 |
| Kween B. Limited | Professional & scientific | 1985 |
| Kwei Children's Home Ltd | Health & social care | 2025 |