| JW Garden Services Ltd | Water & waste | 2019 |
| JWB & Partners Ltd | Financial services | 2019 |
| Jwce Ltd | Construction | 2016 |
| JWN Property Ltd | Real estate | 2025 |
| K & K Property Limited | Real estate | 2017 |
| K & M Watkins Ltd | Real estate | 2016 |
| K & N Seating Ltd | Administrative & support | 2017 |
| K & S Horseboxes Limited | Manufacturing | 2006 |
| K 3000 Limited | Administrative & support | 2022 |
| K Bryant Investment Limited | Real estate | 2015 |
| K D & JAY Limited | Wholesale & retail | 2007 |
| K S Stores Ltd | Wholesale & retail | 2014 |
| K&Jtraders Ltd | Administrative & support | 2022 |
| K&K Hawkes Ltd | Hospitality | 2016 |
| K&R Agricultural Cleaning Ltd | Administrative & support | 2025 |
| K. G. D. Enterprises Limited | Manufacturing | 1982 |
| K.C.I.T. Software Limited | Information & communication | 1983 |
| K.P.B. Management Limited | Households | 1980 |
| K.W. Electrical (Hereford) Ltd | Construction | 2014 |
| K22 Properties Ltd | Real estate | 2022 |
| K2N Cargo Limited | Transport & logistics | 2020 |
| KA Secretarial Ltd | Administrative & support | 2025 |
| Kadr Solutions Ltd | Professional & scientific | 2017 |
| Kahden Limited | Hospitality | 2019 |
| Kalapac Ltd | Real estate | 2023 |
| Kalendar Ltd | Professional & scientific | 2025 |
| Kamelia Photography Ltd | Professional & scientific | 2021 |
| Kando Living Ltd | Real estate | 2018 |
| Karen Court Maintenance Company Limited | Real estate | 1969 |
| Kari Morgan Limited | Hospitality | 2015 |
| Karl Beddard Consultants Ltd | Administrative & support | 2011 |
| Kars Limited | Manufacturing | 2009 |
| Karsal Ltd | Real estate | 2020 |
| KAS EOD Limited | Professional & scientific | 2024 |
| Katan Care Limited | Health & social care | 2026 |
| Kate Bliss Limited | Information & communication | 2011 |
| Kate Cosmetic Ltd | Other services | 2024 |
| Kate Hird PR Ltd | Professional & scientific | 2026 |
| Kate Murrie Associates Ltd | Education | 2008 |
| Katherine Harriet Ltd | Health & social care | 2015 |
| Kathy Twigg Financial Planning Ltd | Professional & scientific | 2020 |
| Kaya at Blackhill Farm Limited | Hospitality | 2021 |
| Kaye Olsen Limited | Health & social care | 2013 |
| Kazilytics Ltd | Information & communication | 2023 |
| KB Plant and Agri Services Ltd | Construction | 2013 |
| Kccb Properties Limited | Real estate | 2022 |
| Kedward Holdings Ltd | Real estate | 2023 |
| Keep in Step International | Other services | 2022 |
| Keepsafe Ltd | Health & social care | 2015 |
| Kellaway Partners Ltd | Financial services | 2025 |
| Kelsam Support Services Limited | Health & social care | 2018 |
| Kemble Developments Limited | Health & social care | 2012 |
| Kempowell Electrical Services Limited | Construction | 2003 |
| Kempowell Holdings Ltd | Financial services | 2019 |
| Kempton Residents Company Limited | Households | 1983 |
| Kencyn Consulting Ltd | Information & communication | 2018 |
| Kenla Security Ltd | Extraterritorial | 2024 |
| Kenyon & Associates Limited | Agriculture & fishing | 2025 |
| Kerin Property Limited | Real estate | 2017 |
| Kernow Neal Ltd | Administrative & support | 2018 |
| Kevin Bellamy Ltd | Professional & scientific | 2026 |
| Key Consultancy Enterprises Ltd | Professional & scientific | 2023 |
| Key Fitness Enterprises Ltd | Information & communication | 2023 |
| Key Projects (Consultancy) Limited | Professional & scientific | 2025 |
| Key Projects (Properties) Limited | Real estate | 2025 |
| Key Projects Ltd | Construction | 2000 |
| Key Property Enterprises Ltd | Real estate | 2019 |
| Keyse Holdings Limited | Professional & scientific | 1987 |
| Kfsi Limited | Financial services | 2003 |
| KG Property Solutions Limited | Real estate | 2019 |
| KGD Process International Limited | Manufacturing | 1994 |
| Kickstart YBF Ltd | Professional & scientific | 2022 |
| Kidas Logistics Limited | Transport & logistics | 2021 |
| Kidwells 360 Ltd | Administrative & support | 2015 |
| Kidwells Accommodation Limited | Hospitality | 2022 |
| Kidwells Accounts Limited | Professional & scientific | 2020 |
| Kidwells Business Limited | Administrative & support | 2018 |
| Kidwells Business Solutions Ltd | Administrative & support | 2023 |
| Kidwells Investments Limited | Real estate | 2021 |
| Kidwells Landco NO.1 Ltd | Financial services | 2025 |
| Kidwells Landco NO.2 Ltd | Financial services | 2025 |
| Kidwells Landco NO.3 Ltd | Financial services | 2025 |
| Kidwells Law Solicitors Limited | Professional & scientific | 2010 |
| Kidwells Legal Loans Limited | Financial services | 2013 |
| Kidwells Lettings Limited | Real estate | 2022 |
| Kidwells Real Estate Holdco Ltd | Financial services | 2025 |
| Kidwells Yachts Limited | Administrative & support | 2021 |
| KIKO36 Transport Ltd | Transport & logistics | 2024 |
| Kind and Clever Ltd | Administrative & support | 2025 |
| Kinder Accountants Limited | Professional & scientific | 2009 |
| King's Acre House (Hereford) Residents Company Limited | Real estate | 1981 |
| Kingdom Project Events Community Interest Company | Arts & recreation | 2013 |
| Kingfisher Housing Ltd | Real estate | 2019 |
| Kingfisher Services UK Limited | Administrative & support | 2004 |
| Kingfurness & Associates Limited | Financial services | 1999 |
| Kings Acre Developments (Hereford) Limited | Construction | 2016 |
| Kings Crescent Management Company Limited | Households | 1999 |
| Kingshead Apartments Management Company Limited | Real estate | 2023 |
| Kingsland Advisory Limited | Professional & scientific | 2026 |
| Kingsthorpe Hove Limited | Real estate | 2019 |