| K.J.A.S Property Services Ltd | Other services | 2026 |
| K.M.Pubmanagement Ltd | Hospitality | 2024 |
| K.S. Builders (Birmingham) Limited | Construction | 2004 |
| K9 Chef - RAW Food FUR Dogs Ltd | Wholesale & retail | 2023 |
| K9 Kitchen Ltd | Wholesale & retail | 2021 |
| KA Leisure Furnishings Ltd | Manufacturing | 2019 |
| Kailey Construction Ltd | Construction | 2024 |
| Kailey Driveway Ltd | Construction | 2024 |
| Kaitlins Trading Limited | Hospitality | 2025 |
| KAL Singh Investment and Asset Limited | Financial services | 2025 |
| Kaler Property Limited | Real estate | 2025 |
| Kalra Logistics Ltd | Transport & logistics | 2025 |
| KAM 4 Logistics UK Ltd | Transport & logistics | 2021 |
| KAM Stores Limited | Wholesale & retail | 2020 |
| Kamal Brar Transport Ltd | Transport & logistics | 2024 |
| Kamdee Express UK Ltd | Transport & logistics | 2023 |
| Kanda's Logistics Limited | Transport & logistics | 2014 |
| Kandola Construction Ltd | Construction | 2019 |
| Kang Executive Travel Ltd | Transport & logistics | 2024 |
| Kang Haulage Ltd | Transport & logistics | 2014 |
| Kaom Ltd | Administrative & support | 2011 |
| KAR Care Ltd | Wholesale & retail | 2025 |
| Kathoti Ltd | Health & social care | 2023 |
| Katnoria Ltd | Real estate | 2025 |
| Kaur Beauty Salon Ltd | Other services | 2025 |
| KAY Way Ltd | Administrative & support | 2023 |
| Kayle at Home Ltd | Agriculture & fishing | 2023 |
| Kayn Recruitment 2 Limited | Administrative & support | 2023 |
| Kbdg Accountancy Limited | Professional & scientific | 2017 |
| KDM Scaffolding Ltd | Construction | 2015 |
| Kean Building & Fire Protection Services Limited | Construction | 2006 |
| Kelscot Plant Limited | Administrative & support | 2018 |
| Kemp and Co Consultancy Limited | Professional & scientific | 2025 |
| Kenazon Limited | Transport & logistics | 2025 |
| Kennell Legacy Co. Ltd | Financial services | 2026 |
| Kensington Supported Housing Ltd | Health & social care | 2017 |
| Kesri Group Ltd | Real estate | 2022 |
| Kev's Cafe Ltd | Hospitality | 2026 |
| Key City Transport Ltd | Transport & logistics | 2025 |
| Key Dental Implant Practice Ltd | Health & social care | 2024 |
| Keys Workwear Limited | Wholesale & retail | 2024 |
| KH Stadium Seating Solutions Limited | Manufacturing | 2019 |
| Khalis Sweet Centre Ltd | Wholesale & retail | 2024 |
| Khalsa Construction (Wolverhampton) Ltd | Construction | 2018 |
| Kind Hearted Healthcare Limited | Health & social care | 2022 |
| Kingsway Eifs Stucco Ltd | Construction | 2023 |
| Kirat Sohal Transport Ltd | Transport & logistics | 2023 |
| Kirkgate Wakefield (AGG14) Limited | Real estate | 2013 |
| Kirtland PUB Company Limited | Hospitality | 2020 |
| Kitchen Canopy Ltd | Manufacturing | 2025 |
| Kitchen Canopy Solutions Ltd | Manufacturing | 2021 |
| Kksb Limited | Transport & logistics | 2021 |
| Kksg Transport Ltd | Transport & logistics | 2025 |
| Kleen Connect Ltd | Administrative & support | 2022 |
| Kler Properties Ltd | Real estate | 2024 |
| KLM Drainage Services Ltd | Water & waste | 2025 |
| KM House Ltd | Real estate | 2024 |
| KMG Haulage Ltd | Transport & logistics | 2024 |
| Knowledgeset Ltd | Education | 2024 |
| Kooner Lettings Limited | Real estate | 2025 |
| Kooner Transport Ltd | Transport & logistics | 2023 |
| Korbay Ltd | Wholesale & retail | 2026 |
| Krato Design Limited | Construction | 2017 |
| KRW Racewear Ltd | Wholesale & retail | 2022 |
| KS Constructions Midland Ltd | Construction | 2022 |
| KS Midlands Ltd | Construction | 2026 |
| KS Property Portfolio Ltd | Real estate | 2026 |
| KSL Construction Ltd | Construction | 2021 |
| KST Accountancy LLP | | 2005 |
| Kuhn Rikon (UK) Limited | Wholesale & retail | 1980 |
| KWS Heating & Plumbing Ltd | Construction | 2024 |
| L & E Financial Advisors Ltd | Education | 2024 |
| L & J Agape Healthcare Ltd | Administrative & support | 2023 |
| L & L Eco Assess Limited | Professional & scientific | 2024 |
| L & S Prestige Estates Ltd | Real estate | 2009 |
| L Douglas Property Co Limited | Real estate | 2019 |
| L E Consultants Ltd | Households | 2023 |
| L J M Contractor Ltd | Transport & logistics | 2017 |
| L&K J Investments Ltd | Real estate | 2025 |
| L&R Kahlon Ltd | Construction | 2018 |
| L. & S. Middleton Limited | Wholesale & retail | 1977 |
| L. R. P. Engineering Limited | Manufacturing | 2003 |
| L.A Interiors and Developments Limited | Construction | 2017 |
| L.P. Electrical Limited | Construction | 1989 |
| Ladhra Constructions Ltd | Construction | 2022 |
| Ladytee Services Ltd | Wholesale & retail | 2022 |
| Lakbir LS Properties Ltd | Real estate | 2025 |
| Laminate Depot Ltd | Wholesale & retail | 2023 |
| Laro Consulting Ltd | Professional & scientific | 2021 |
| Later Life Protection Limited | Professional & scientific | 2018 |
| Learningcore Ltd | Education | 2026 |
| LEE Ireson Ltd | Construction | 2021 |
| LEE Osborne Project Management Ltd. | Manufacturing | 2016 |
| Leeglatools Ltd | Construction | 2025 |
| Lefta Limited | Information & communication | 2014 |
| Lekmore Global Services Limited | Wholesale & retail | 2023 |
| Leonies Quality Care Limited | Health & social care | 2022 |
| Let’S Build Construction Ltd | Construction | 2025 |
| LG Building Contractors Ltd | Administrative & support | 2016 |
| LG Fire Ltd | Public administration | 2014 |