| Kase Design Limited | Information & communication | 2010 |
| Kashworth Properties Ltd | Hospitality | 2026 |
| Katie Collins Limited | Professional & scientific | 2022 |
| Katsu Kitchen (Moseley) Ltd | Professional & scientific | 2019 |
| Kaur Industries Ltd | Wholesale & retail | 2023 |
| Kaur Solutions Ltd | Other services | 2017 |
| Kavita Consultancy Services Limited | Professional & scientific | 2025 |
| Kawoo Properties Ltd | Real estate | 2024 |
| KAY Import and Export Limited | Wholesale & retail | 2023 |
| Kay-Lou Childcare Ltd | Administrative & support | 2003 |
| Kaya Consultants Ltd | Professional & scientific | 2026 |
| KAZ Type Limited | Information & communication | 2015 |
| KBS Consultants Limited | Information & communication | 2008 |
| KC Bespoke Developments Limited | Construction | 2024 |
| KC Components Ltd | Water & waste | 2025 |
| KC Electrical & Building Solutions Ltd | Construction | 2023 |
| KC Nails and Spa LLP | | 2024 |
| KC Property (Midlands) Ltd | Real estate | 2018 |
| KCL Business Consultancy Ltd | Professional & scientific | 2023 |
| Kclear HR Limited | Administrative & support | 2019 |
| Kcos Venture Ltd | Wholesale & retail | 2025 |
| KD13 Ltd | Real estate | 2026 |
| KDS Design Ltd | Professional & scientific | 2017 |
| Kebab Shack Ltd | Hospitality | 2022 |
| Keenan Project Designs Ltd | Professional & scientific | 2017 |
| Keep Calm and Beer (the Hope) Limited | Hospitality | 2026 |
| Keep Calm and Beer IT Ltd | Hospitality | 2022 |
| Kellmarsh Limited | Construction | 2023 |
| Kemdex Limited | Real estate | 2025 |
| KEN Hospitality Limited | Hospitality | 2026 |
| Kenev UK Ltd | Professional & scientific | 2020 |
| Kenilworth Mews Management Company Limited | Real estate | 2013 |
| Kensington Consultants Limited | Other services | 2023 |
| Kensington House Management Company Limited | Real estate | 2001 |
| Kerem Taxi Ltd | Transport & logistics | 2022 |
| Kerome (Holdings) Limited | Professional & scientific | 2005 |
| Kevin Richens Motors Limited | Wholesale & retail | 2003 |
| Kevin Watson Bookkeeping Ltd | Professional & scientific | 2023 |
| Key Asset Investment Ltd | Real estate | 2015 |
| Key Heating Limited | Construction | 2014 |
| Key IT Services Ltd | Information & communication | 2025 |
| Keys and Homes Property Limited | Real estate | 2024 |
| Keystone Developments Limited | Real estate | 2011 |
| Keystone Homes (ASN) Ltd | Households | 2019 |
| Keystone Reactive Maintenance Limited | Construction | 2025 |
| Keyterra-Firma Limited | Professional & scientific | 1998 |
| Khalsa Leamington Hockey Club Pitch & Clubhouse C.I.C. | Arts & recreation | 2025 |
| Khari Limited | Information & communication | 2011 |
| Khuttan Chiropractic Ltd | Health & social care | 2019 |
| Kiara Rose Limited | Wholesale & retail | 1990 |
| Kiddora Limited | Wholesale & retail | 2025 |
| Kids Play Football Ltd | Wholesale & retail | 2024 |
| Kieran Kelly Consultancy Services Limited | Professional & scientific | 2013 |
| Kigass Limited | Construction | 1924 |
| Kigass Property Holdings Limited | Professional & scientific | 2021 |
| KIM Park Tradings Limited | Real estate | 2023 |
| KIN & Gather Ltd | Hospitality | 2026 |
| KIN Solutions Limited | Information & communication | 2013 |
| Kind Mind Clinic Limited | Health & social care | 2023 |
| Kinetic Core AI Ltd | Professional & scientific | 2025 |
| Kinetic Terra Limited | Construction | 2025 |
| Kineton Sports and Social Supporters Club Limited | Hospitality | 2017 |
| King Milton Developments Limited | Construction | 1968 |
| Kingsbury IT Solutions Limited | Professional & scientific | 2024 |
| Kingsland James Limited | Real estate | 2016 |
| Kingston Properties Limited | Real estate | 1986 |
| Kingsway Capital Management Ltd | Other services | 2015 |
| Kingsway Estate Agents Limited | Real estate | 2023 |
| Kingswood Nutrition Limited | Administrative & support | 2023 |
| Kinisi Automotive Limited | Professional & scientific | 2026 |
| Kinza Investments Ltd | Real estate | 2026 |
| Kipps Ltd | Professional & scientific | 2019 |
| Kirby Grange Limited | Health & social care | 1998 |
| Kirkland Court Management Company Limited | Households | 1983 |
| Kirsty Partridge Art Limited | Arts & recreation | 2018 |
| Kiss Publishing Ltd | Information & communication | 2017 |
| KIT Barber Limited | Administrative & support | 2026 |
| KIT Holdings Ltd | Professional & scientific | 2021 |
| Kite Estates Limited | Professional & scientific | 2018 |
| Kiwi & Co Holdings Limited | Professional & scientific | 2020 |
| Kiwicareers Limited | Administrative & support | 2017 |
| KJB Management Services Ltd | Professional & scientific | 2015 |
| KL 71 Limited | Hospitality | 2025 |
| Kl&Ar Limited | Wholesale & retail | 2021 |
| Klas Steel Limited | Construction | 2013 |
| Kmagill Consulting Limited | Information & communication | 2005 |
| Kmcg Limited | Professional & scientific | 2021 |
| KMF Property Rentals Limited | Real estate | 2021 |
| KNC Project Management Limited | Professional & scientific | 2018 |
| Kneeta Solutions Ltd | Administrative & support | 2025 |
| Knell Consulting Limited | Professional & scientific | 2011 |
| Knight Errant Services Limited | Wholesale & retail | 2002 |
| Knights Heating Kenilworth Limited | Construction | 2016 |
| Knights Lane (Tiddington) Development Limited | Real estate | 2018 |
| Komax Hoildings Ltd | Households | 2017 |
| Konduit Limited | Professional & scientific | 2009 |
| Kooala Limited | Arts & recreation | 2017 |
| Korc Ltd | Administrative & support | 2025 |
| Korpower Limited | Professional & scientific | 2022 |
| KP Bookkeeping Services Ltd | Professional & scientific | 2016 |