| KD Builders Ltd | Construction | 2014 |
| Kear Property Developments Limited | Construction | 2004 |
| Kearglaze Ltd | Construction | 2024 |
| Keavman Contractors Limited | Construction | 1999 |
| Keavman Holdings Ltd | Financial services | 2020 |
| Keene Medical Limited | Health & social care | 2019 |
| Keep This Number Limited | Professional & scientific | 2019 |
| Keihan Systems Limited | Manufacturing | 2003 |
| Kelbec Plant Hire Limited | Administrative & support | 2007 |
| Kelly ( West Midlands) Holdings Limited | Financial services | 2020 |
| Kelly Plant Hire Limited | Construction | 2003 |
| Kelly Property Lets Ltd | Real estate | 2023 |
| Kempson 1972 Limited | Extraterritorial | 2013 |
| Kencal Management Limited | Financial services | 2010 |
| Kencal Property Management Limited | Real estate | 2019 |
| Kencal Rise Limited | Real estate | 2019 |
| Kengrip UK Limited | Professional & scientific | 2022 |
| Kennedy Home and Property Ltd | Real estate | 2026 |
| Kennelcam UK Ltd | Information & communication | 2026 |
| Kensi Hope Interiors Ltd | Construction | 2015 |
| Kericho Holdings Limited | Financial services | 2023 |
| Keshel Properties Limited | Real estate | 2022 |
| Kestrel Classic Cars Limited | Wholesale & retail | 2015 |
| Kettler Property (GB) Limited | Financial services | 2022 |
| Kevin Halligan Ltd | Financial services | 2018 |
| Key Construction (Midlands) Limited | Construction | 1995 |
| Key Construction Homes Limited | Construction | 2020 |
| Key Pharmaceuticals Limited | Wholesale & retail | 2000 |
| Keychain Properties Limited | Real estate | 2018 |
| Keyco Limited | Wholesale & retail | 2012 |
| Keyfast Consultancy Ltd | Professional & scientific | 2017 |
| Keystone Integrations Ltd | Administrative & support | 2024 |
| KFM Shopfitters Builders and Design Services Ltd | Construction | 2025 |
| KG Autoelectrics Ltd | Professional & scientific | 2017 |
| KG Washford Limited | Manufacturing | 1999 |
| KGF COX Group Limited | Financial services | 2023 |
| Kh&J Limited | Real estate | 2021 |
| KHD Developments Limited | Construction | 2025 |
| Kidderminster Glass Limited | Professional & scientific | 1993 |
| Kildare Sales Hire & Haulage Ltd | Wholesale & retail | 2020 |
| KIM Bayliss Wealth Management Limited | Professional & scientific | 2003 |
| Kimbo Media Ltd | Professional & scientific | 2024 |
| Kincaid Consultancy Ltd | Professional & scientific | 2024 |
| Kineton Developments Ltd | Construction | 2025 |
| Kineton Land Ltd | Construction | 2026 |
| Kingdom Key Estate Ltd | Hospitality | 2025 |
| Kingfisher Contracts Ltd | Transport & logistics | 2025 |
| Kingfisher Home Developments Ltd | Construction | 2019 |
| Kingfisher Office Services LLP | | 2019 |
| Kingfisher Office Solutions LLP | | 2019 |
| Kingfisher PCN Limited | Health & social care | 2022 |
| Kingfisher Property Management Services Limited | Real estate | 2025 |
| Kingfisher Taverns Limited | Hospitality | 2018 |
| Kings Car Company Ltd | Wholesale & retail | 2019 |
| Kingston Glassworks Limited | Real estate | 1964 |
| Kingston Mews (Henley-In-Arden) Management Company Limited | Professional & scientific | 1997 |
| Kingswear Financial Ltd | Professional & scientific | 2026 |
| Kingswinford Shopfitting Services Limited | Construction | 2023 |
| Kirbeco Ltd | Construction | 2024 |
| Kirby Technologies Ltd | Information & communication | 2018 |
| Kirk Turned Parts Ltd | Professional & scientific | 2018 |
| Kirkden Smith Ltd | Administrative & support | 2023 |
| Kirkpatrick Carriers Limited | Transport & logistics | 1988 |
| Kirkpatrick Holdings Limited | Transport & logistics | 1972 |
| Kiss HR (UK) Ltd | Administrative & support | 2003 |
| KIT Cars UK Ltd | Wholesale & retail | 2020 |
| Kitchener Estates Ltd | Extraterritorial | 2022 |
| Kite & Co Accountants Limited | Professional & scientific | 1999 |
| Kiyo Holdings Limited | Real estate | 2026 |
| KJR Maintenance Limited | Professional & scientific | 2025 |
| KJS Projects Ltd | Professional & scientific | 2014 |
| KLO Financial Services Ltd | Professional & scientific | 2013 |
| KM Brickwork & Building Ltd | Construction | 2021 |
| KMG Communications Ltd | Professional & scientific | 2010 |
| KML Promotions Limited | Administrative & support | 2011 |
| KN Properties Services UK Ltd | Real estate | 2023 |
| Knconsultancysolutions Ltd | Professional & scientific | 2023 |
| KNG Property Investments Ltd | Real estate | 2019 |
| Knights Chemist Limited | Wholesale & retail | 1985 |
| Knights MOT Services Ltd | Wholesale & retail | 2023 |
| Kntrainingsolutions Ltd | Education | 2021 |
| Kobe Design Ltd | Information & communication | 2024 |
| Kobe Talent Ltd | Professional & scientific | 2026 |
| Kobe Visuals Ltd | Information & communication | 2021 |
| Koitopia Ltd | Administrative & support | 2014 |
| Kolo Media Ltd | Professional & scientific | 2026 |
| Kombined Auto Paint Limited | Administrative & support | 2017 |
| Kombined Holdings Limited | Administrative & support | 2013 |
| Kombined Motor Limited | Professional & scientific | 1991 |
| Kombined Motor Services (Redditch) Limited | Administrative & support | 2013 |
| Kontrakt Property Limited | Real estate | 2019 |
| KOS Companies Ltd | Administrative & support | 2024 |
| Kosta Car Wash Ltd | Administrative & support | 2023 |
| Kottura Limited | Extraterritorial | 2008 |
| Kowalski TJ Ltd | Health & social care | 2015 |
| KP Developments (Worcester) Limited | Construction | 2018 |
| KPL 22 DK Street Limited | Real estate | 2011 |
| KPL Productions Limited | Information & communication | 2024 |
| KPS Commercial Kitchens Limited | Construction | 2006 |
| KPX Bookkeeping Ltd | Professional & scientific | 2021 |