| K & D Cork Investments Limited | Real estate | 2023 |
| K & J Brierley Properties Ltd | Real estate | 2025 |
| K and S Estate Agents Ltd | Real estate | 2023 |
| K Clarke Transport Limited | Transport & logistics | 2016 |
| K D H Holdings Limited | Financial services | 2015 |
| K D H Insurance Brokers Limited | Financial services | 2003 |
| K Pennant Properties Limited | Real estate | 2025 |
| K&D Sheds & Garden Buildings Limited | Manufacturing | 2026 |
| K. T. Management Company (U.K.) Limited | Households | 2006 |
| K9 Pet Products UK Limited | Other services | 2009 |
| Kaavya Properties Limited | Real estate | 2023 |
| Kabel Teknik Limited | Manufacturing | 1998 |
| Kaliana Integrated Services UK Ltd | Real estate | 2026 |
| Kalinkov Ltd | Manufacturing | 2015 |
| Kane Barbers Ltd | Other services | 2024 |
| Kapasi Car Spares Limited | Wholesale & retail | 2008 |
| Karib Kitchen - Stratford Upon Avon Limited | Hospitality | 2021 |
| Katerina 10 Ltd | Construction | 2014 |
| Kathari Energia Limited | Mining & quarrying | 2021 |
| Kayani Lettings Limited | Real estate | 2015 |
| Kayra Hemp Technologies Ltd | Wholesale & retail | 2025 |
| KB7 Properties Limited | Real estate | 2025 |
| KBM Solutions Limited | Manufacturing | 2022 |
| KDC Consultancy Ltd | Professional & scientific | 2025 |
| KDR Resin Systems Group Limited | Financial services | 2019 |
| KDR Resin Systems Limited | Construction | 2013 |
| KEE Limited | Health & social care | 2020 |
| Keecad Holdings Limited | Financial services | 2017 |
| Kellstrom Defence Industries UK Limited | Professional & scientific | 2014 |
| Kellstrom Defense Aerospace (UK) Limited | Professional & scientific | 2019 |
| Kelly Nail Bar Ltd | Other services | 2021 |
| Ken's Takeaway Midlands Ltd | Hospitality | 2023 |
| Kenatrans Ltd | Transport & logistics | 2021 |
| Kenny Electrical Limited | Construction | 2021 |
| Kenza Dali Limited | Arts & recreation | 2023 |
| Ketou Ltd | Transport & logistics | 2016 |
| Kettle and Toaster MAN Limited | Wholesale & retail | 2012 |
| Kev's Sheds and Summer House Ltd | Manufacturing | 2023 |
| Key Financial Planning Limited | Financial services | 2019 |
| Key Logistic Services Ltd | Transport & logistics | 2009 |
| Key One Management Company Limited | Households | 1989 |
| Keystone Global Solutions Limited | Information & communication | 2018 |
| KF35 Properties Limited | Real estate | 2025 |
| KH Peak Finance Ltd | Professional & scientific | 2026 |
| KH7 Developments Limited | Real estate | 2024 |
| KH7 Properties Limited | Real estate | 2020 |
| Khayes Limited | Health & social care | 2016 |
| Kian's Cutz Ltd | Other services | 2020 |
| Kiel's Fuels Ltd | Transport & logistics | 2020 |
| Kiltipper Training and Solutions Ltd | Health & social care | 2026 |
| KIM Yvette Phillips Limited | Extraterritorial | 2025 |
| Kings Norton Construction Services Limited | Construction | 2012 |
| Kingsfleet Auto Solutions Ltd | Wholesale & retail | 2023 |
| Kingsland Aluminium Ltd | Manufacturing | 2025 |
| Kingsland Systems Limited | Manufacturing | 2015 |
| Kingslei Consultancy Limited | Professional & scientific | 2021 |
| Kingswinford Constructions Limited | Construction | 2025 |
| Kingswinford Containers Ltd | Wholesale & retail | 2021 |
| Kingswinford Doors Limited | Construction | 2018 |
| Kingswinford Loft Conversions Ltd | Construction | 2021 |
| Kinspire Limited | Information & communication | 2021 |
| Kinver Lifting & Agri Limited | Wholesale & retail | 2023 |
| Kinver Point Limited | Professional & scientific | 2000 |
| KIT ME OUT Shop Limited | Wholesale & retail | 2016 |
| Kiyomee Studios Ltd | Professional & scientific | 2019 |
| KJ Structures Ltd | Manufacturing | 2013 |
| Kjadvisory Limited | Extraterritorial | 2022 |
| Klawz Limited | Construction | 2015 |
| Knight Bridge Travel Ltd | Transport & logistics | 2024 |
| Knights Entertainment & Leisure Limited | Financial services | 2018 |
| KNN Trading Ltd | Wholesale & retail | 2020 |
| Knoft Properties Ltd | Real estate | 2022 |
| Koeat Ltd | Wholesale & retail | 2025 |
| Koliqielectrical Ltd | Construction | 2023 |
| Kolleth Holdings Limited | Financial services | 2024 |
| Konsult Law Ltd | Professional & scientific | 2025 |
| KP45 Properties Limited | Real estate | 2022 |
| KPT Hawk Limited | Real estate | 2023 |
| Kraza Ltd | Transport & logistics | 2025 |
| Kris Transport & SON Ltd | Transport & logistics | 2018 |
| Ksfg Properties Limited | Real estate | 2024 |
| KT (UK) Holdings Ltd | Professional & scientific | 2017 |
| KT9 Properties Limited | Real estate | 2022 |
| KTM Secretarial Service Limited | Professional & scientific | 2014 |
| Kukkina Boutique Limited | Wholesale & retail | 2021 |
| Kulaar Landscaping and Building Works Ltd | Construction | 2026 |
| Kumar & Sons Properties Limited | Real estate | 2004 |
| L & a KOI Specialist Ltd | Wholesale & retail | 2023 |
| L & S Scaffolding Midlands Limited | Construction | 2009 |
| L a Industrial Limited | Manufacturing | 2016 |
| L a Motors (Midlands) Ltd | Wholesale & retail | 2018 |
| L a Valeting(Midlands) Ltd | Administrative & support | 2022 |
| L Atkins Tuition Limited | Education | 2023 |
| L Bean Properties Limited | Real estate | 2020 |
| L Freeman Properties Limited | Real estate | 2022 |
| L P J Properties Limited | Construction | 1999 |
| L&S Management Services Ltd | Financial services | 2021 |
| LA Estates (Midlands) Ltd | Real estate | 2025 |
| LA Gogu Ltd | Hospitality | 2025 |
| LA Properties (Midlands) Ltd | Real estate | 2022 |