| K&O Management Solutions Ltd | Professional & scientific | 2025 |
| K&V Care and Recruitment Services Ltd | Health & social care | 2021 |
| K.D Hotel Management Consultancy Ltd | Hospitality | 2026 |
| K.H. Taylor Holdings Limited | Financial services | 2024 |
| Kaleido Hair & Beauty Limited | Other services | 2022 |
| Kandel and Jacobs Limited | Extraterritorial | 1944 |
| Kate Horne Therapy Run Ltd | Health & social care | 2026 |
| Kazander Limited | Wholesale & retail | 2024 |
| Kebabhouseworksop Limited | Hospitality | 2025 |
| Keith Broadhead Haulage Ltd | Manufacturing | 2008 |
| Kengai UX Ltd | Information & communication | 2013 |
| Kepil Catering Services Ltd | Hospitality | 2022 |
| Kershaw Management Ltd | Professional & scientific | 2020 |
| KEW Klad Ltd | Construction | 2024 |
| Key Kind Ltd | Real estate | 2025 |
| Keyshare Innovations Limited | Transport & logistics | 2016 |
| Kian Renovations Ltd | Real estate | 2024 |
| Kilton House Ltd | Hospitality | 2023 |
| Kilton Inn S80 Ltd | Hospitality | 2019 |
| Kilton Kafe Ltd | Hospitality | 2025 |
| Kime Wardley Limited | Financial services | 2025 |
| Kinematic Trees Ltd. | Information & communication | 2024 |
| Kinetic Chiropractic Clinic Limited | Health & social care | 2023 |
| Kingdom Property Ltd | Construction | 2018 |
| Kingston Road Community Hub Ltd | Real estate | 2020 |
| Kingsway Building & Joinery Limited | Construction | 2018 |
| Kiotech Limited | Extraterritorial | 1995 |
| Kiotechagil Limited | Extraterritorial | 2008 |
| Kiril Mischeff (Trading) Limited | Professional & scientific | 2005 |
| Kiril Mischeff Limited | Wholesale & retail | 1930 |
| Kiss and Makeup S.L. Limited | Other services | 2021 |
| Kixx Matlock Ltd | Education | 2021 |
| KJ Bownes Group Ltd | Construction | 2019 |
| Kjgb Marsh Estates Limited | Real estate | 2025 |
| KKL Distributors Ltd | Wholesale & retail | 2022 |
| KKL Enterprise Limited | Wholesale & retail | 2022 |
| Klaydons Ltd | Information & communication | 2023 |
| KM Social Work Solutions Ltd | Health & social care | 2024 |
| KMD Property Investments Limited | Real estate | 2015 |
| Kmw-F Limited | Professional & scientific | 2026 |
| Knight Estates & Investments Ltd | Real estate | 2026 |
| Koffee House (Celtic) Limited | Hospitality | 2021 |
| Konelen Construction Ltd | Construction | 2014 |
| Kostas BBQ & Grill Ltd | Hospitality | 2026 |
| Krautomotivecustoms Ltd | Wholesale & retail | 2025 |
| Krishnaprajnan IT Consulting Ltd | Information & communication | 2024 |
| Krishnaprajnan Property PVT Ltd. | Real estate | 2023 |
| Kristi Marlow Aesthetics Ltd | Other services | 2022 |
| KRK Innovations Limited | Wholesale & retail | 2024 |
| KT (Yorkshire) Limited | Extraterritorial | 2020 |
| Kuchuk and Sons Logistics Limited | Transport & logistics | 2022 |
| Kuchuk Property Management Ltd | Administrative & support | 2023 |
| KW Home Solutions Ltd | Construction | 2025 |
| Kybotech Group Limited | Financial services | 2021 |
| Kybotech Limited | Wholesale & retail | 1999 |
| Kybotech Retail Limited | Wholesale & retail | 2017 |
| L & R Services Limited | Wholesale & retail | 2025 |
| L and H Holding Company Limited | Financial services | 2019 |
| L and R Booth Investments Ltd | Arts & recreation | 2024 |
| L and R N Company Limited | Administrative & support | 2018 |
| L Barnes Painter and Decorator Ltd | Administrative & support | 2013 |
| L MAY Family Limited | Real estate | 2017 |
| L MAY Investments Limited | Real estate | 2014 |
| L Skeet Ltd | Wholesale & retail | 2023 |
| L T Roofing & Property Services Ltd | Construction | 2026 |
| L&K Property Investments Ltd | Real estate | 2016 |
| Laark Enterprises Limited | Real estate | 2026 |
| Lads and Dads Limited | Other services | 2015 |
| Landi United Ltd | Real estate | 2023 |
| Laneys Limited | Wholesale & retail | 2003 |
| Langold Allotments Limited | Agriculture & fishing | 2022 |
| Langold Fish Ltd | Hospitality | 2019 |
| Langold Mini Market Ltd | Wholesale & retail | 2026 |
| Langold Stables Management Company Limited | Households | 2010 |
| Lapworth Properties Ltd | Real estate | 2024 |
| Larwood Physiotherapy Clinic Ltd | Health & social care | 2009 |
| Laser Labyrinth Ltd | Arts & recreation | 2012 |
| Laurenne Hopkins Flowers Ltd | Wholesale & retail | 2025 |
| Lawn Road Cafe Limited | Hospitality | 2022 |
| Layered With Art Ltd | Wholesale & retail | 2026 |
| Layla Food Ltd | Wholesale & retail | 2025 |
| Lazeco Ltd | Wholesale & retail | 2019 |
| Lazmc Property Investments Ltd | Real estate | 2021 |
| LCM Interiors Ltd | Construction | 2026 |
| LD Carpets & Flooring Ltd | Construction | 2023 |
| Lddhdt Ltd | Health & social care | 2018 |
| Leadership Plus Limited | Education | 2018 |
| Leamick Building Systems Limited | Construction | 2001 |
| Lebroy Ltd | Wholesale & retail | 2017 |
| Leda Homecare Limited | Health & social care | 2005 |
| Leoj Trans Ltd | Transport & logistics | 2016 |
| Lepandy Ltd | Wholesale & retail | 2024 |
| Letaron Lighting Limited | Wholesale & retail | 2015 |
| Letwell Medical Limited | Health & social care | 2019 |
| Lewco Plumbing & Heating Ltd | Construction | 2022 |
| Lewco Properties Ltd | Real estate | 2023 |
| Lexiconnect Limited | Information & communication | 2005 |
| LFF Grace House | Other services | 2017 |
| LH & SV Properties Limited | Real estate | 2017 |
| LH ALL Seasons Limited | Wholesale & retail | 2014 |