| Kiguland Ltd | Wholesale & retail | 2026 |
| Kihan Limited | Wholesale & retail | 2024 |
| Kiki Life Ltd | Information & communication | 2023 |
| Kiki N Abi's Ltd | Wholesale & retail | 2024 |
| Kilgallen Automotive/Recovery Ltd | Wholesale & retail | 2026 |
| Kilnhurst Fish Bar Ltd. | Hospitality | 2009 |
| Kilnhurst Tyres & Exhausts Ltd | Wholesale & retail | 2009 |
| Kilo Productions Ltd | Professional & scientific | 2026 |
| Kimberworth Park Community Partnership | Information & communication | 2002 |
| Kimberworth Park Practice Limited | Health & social care | 2010 |
| Kimberworth Stores Ltd | Wholesale & retail | 2025 |
| Kimberworth Surveying Ltd | Construction | 2013 |
| Kimstar Limited | | 1976 |
| Kindora Services Group Ltd | Construction | 2026 |
| Kinetic Works Limited | Administrative & support | 2016 |
| King Chiropractic Limited | Health & social care | 2025 |
| Kingdom Bookkeeping Ltd | Professional & scientific | 2008 |
| Kingdom Equestrian Limited | Wholesale & retail | 2023 |
| Kingfisher Accountants Limited | Professional & scientific | 2012 |
| Kingsforth Security Fencing Limited | Administrative & support | 1980 |
| Kingsley House 258 Limited | Hospitality | 2025 |
| Kingswood Electrical Solutions Ltd | Construction | 2023 |
| Kingswood Travel Associates Limited | Extraterritorial | 2012 |
| Kins Vape Limited | Wholesale & retail | 2026 |
| Kinsley MOT Ltd | Wholesale & retail | 2025 |
| Kinvara Private Hospital Ltd | Health & social care | 2018 |
| Kiplings@Vq UK Ltd | Hospitality | 2024 |
| Kirby’S Diner Limited | Hospitality | 2023 |
| Kirikaran News Ltd | Wholesale & retail | 2021 |
| Kirsopp Builders Limited | Construction | 2010 |
| Kirstypickering Ltd | Health & social care | 2024 |
| Kismet Enterprises Limited | Professional & scientific | 1991 |
| Kismet Turkish Food Ltd | Hospitality | 2023 |
| Kitchen Door Makeovers Ltd | Manufacturing | 2022 |
| Kitchen Vault Limited | Wholesale & retail | 2020 |
| Kitesurfing IS Awesome Limited | Information & communication | 2017 |
| Kittus Construction Ltd | Construction | 2018 |
| Kiwes Healthcare Ltd Ltd | Health & social care | 2019 |
| Kixx Hyde Limited | Real estate | 2018 |
| Kixx Leeds Limited | Education | 2019 |
| Kixx Sunderland Ltd | Education | 2022 |
| KJB Properties Limited | Real estate | 2025 |
| KJI Ltd | Wholesale & retail | 2025 |
| KJM Creations Ltd | Manufacturing | 2023 |
| KK Asset Management Ltd | Real estate | 2021 |
| KK Capital Investment Solutions Ltd | Professional & scientific | 2019 |
| KK Motor Trade Ltd | Wholesale & retail | 2026 |
| Kklh Properties Ltd | Real estate | 2025 |
| KKP Electrical Ltd | Construction | 2024 |
| Klair & Co Ltd | Wholesale & retail | 2002 |
| Klarity Consultancy Ltd | Health & social care | 2026 |
| Klect Electrical Services Ltd | Construction | 2015 |
| Klevin Ltd | Transport & logistics | 2020 |
| Klik Digital Ltd | Information & communication | 2020 |
| Klikbuyer.Com Ltd | Information & communication | 2023 |
| KLM Roofing & Cladding Ltd | Construction | 2025 |
| Klmw Holdings Ltd | Construction | 2021 |
| Klober Roofing Ltd | Construction | 2024 |
| KLR Safety Limited | Public administration | 2018 |
| KLS Civils & Groundworks Ltd | Construction | 2025 |
| KLW Land Ltd | Real estate | 2024 |
| Klyk Digital Ltd | Information & communication | 2025 |
| KM Green Ltd | Administrative & support | 2020 |
| KM Rhythm & Light Ltd | Information & communication | 2026 |
| Kmag Consultancy Ltd | Information & communication | 2011 |
| KMD Rotherham Limited | Wholesale & retail | 2015 |
| KMG Training Ltd | Education | 2025 |
| KMS Solutions Ltd | Information & communication | 2021 |
| KN Care&Support Ltd | Public administration | 2022 |
| KNA Yorkshire Ltd | Hospitality | 2026 |
| Kncustoms Ltd | Wholesale & retail | 2020 |
| Knight and Slack Limited | Construction | 2014 |
| Knightsbridge Crown Ltd | Hospitality | 2026 |
| Kniveton Properties Limited | Real estate | 2025 |
| KNL Transport Ltd | Transport & logistics | 2014 |
| Knovr Ltd | Wholesale & retail | 2023 |
| Knowles Project Management Ltd | Professional & scientific | 2023 |
| KO Catering Services Limited | Hospitality | 2017 |
| Koda Pack Ltd | Administrative & support | 2022 |
| Koda Property Services Ltd | Real estate | 2024 |
| Kodo CUT Limited | Other services | 2025 |
| Kodygas Limited | Construction | 2021 |
| Kogamj Ltd | Health & social care | 2013 |
| Koko Healthcare Ltd | Professional & scientific | 2018 |
| Koko Investments Ltd | Professional & scientific | 2018 |
| Koko Projects Ltd | Construction | 2018 |
| Kononvictor Ltd | Transport & logistics | 2024 |
| Korean Martial Arts Ltd | Education | 2024 |
| Kosmaerhil Ltd | Administrative & support | 2021 |
| KOYA122 Limited | Other services | 2024 |
| KP Hot Tubs Ltd | Construction | 2026 |
| KP of Rotherham Ltd | Financial services | 2024 |
| KP Scent & Beauty Distributors Limited | Wholesale & retail | 2025 |
| KPB Group Limited | Hospitality | 2026 |
| KPE Properties Limited | Real estate | 2018 |
| KPZ Consultants Ltd | Administrative & support | 2013 |
| KR Care Services Ltd | Health & social care | 2022 |
| Krafty and Creative CIC | Information & communication | 2025 |
| Krash Limited | Wholesale & retail | 2025 |
| Kris Sales Limited | Wholesale & retail | 2025 |