| Key Lime Tree Limited | Agriculture & fishing | 1977 |
| Key Logistics (KSH) Ltd | Transport & logistics | 2019 |
| Key Logistics (Midlands) Ltd | Transport & logistics | 2021 |
| Key Logistics MID Ltd | Transport & logistics | 2025 |
| Key Midland Properties Ltd | Real estate | 2026 |
| Key Progress Finance Ltd | Professional & scientific | 2026 |
| Key Property Investments (Number One) Limited | Real estate | 1997 |
| Key Property Investments (Number Two) Limited | Real estate | 2001 |
| Key Property Ventures Ltd | Real estate | 2018 |
| Key Realty Limited | Real estate | 2024 |
| Key Steps Supported Accommodation Limited | Health & social care | 2022 |
| Key Supported Housing Ltd | Real estate | 2026 |
| Key Venture Capital Ltd | Real estate | 2018 |
| KEY2FUTURE Ltd | Education | 2023 |
| Keyani & Sons Limited | Manufacturing | 1999 |
| Keyani Holdings Ltd | Financial services | 2017 |
| Keyani Investments Ltd | Financial services | 2016 |
| Keyani Real Estate Ltd | Real estate | 2017 |
| Keyani Wholesale Ltd | Wholesale & retail | 2020 |
| Keybrick Properties Ltd | Construction | 2025 |
| Keycasa Ltd | Real estate | 2025 |
| Keycraft Automotive Ltd | Wholesale & retail | 2026 |
| Keye Consulting Ltd | Professional & scientific | 2026 |
| Keyes Slater Ltd | Real estate | 2018 |
| Keyford Precision Engineering Ltd | Manufacturing | 1973 |
| Keyholders PM Ltd | Real estate | 2025 |
| Keyhouse Holdings Limited | Real estate | 2020 |
| Keyih Bahri Ltd | Hospitality | 2021 |
| Keyjobs Ltd | Administrative & support | 2024 |
| Keylet Dwellings Limited | Real estate | 2023 |
| Keyman Records Ltd | Information & communication | 2025 |
| Keymatch Property Limited | Real estate | 2024 |
| Keyopps Ltd | Administrative & support | 2012 |
| Keypoint Systems Limited | Wholesale & retail | 1993 |
| Keyprompt Limited | Information & communication | 1988 |
| Keyring Properties Limited | Real estate | 2018 |
| Keys 1888 Holdings Ltd | Other services | 2024 |
| Keys 1888 Limited | Other services | 2024 |
| Keys 2 Living Ltd | Hospitality | 2026 |
| Keys and Cribs Birmingham Ltd | Real estate | 2026 |
| Keys by Owner Ltd | Information & communication | 2026 |
| Keys Property Solution Ltd | Administrative & support | 2025 |
| Keys to Careers Limited | Wholesale & retail | 2016 |
| Keysafe Home Security Limited | Manufacturing | 2025 |
| Keysquarehousing Ltd | Real estate | 2025 |
| Keystage Academy Ltd | Information & communication | 2020 |
| Keyston Limited | Wholesale & retail | 2025 |
| Keystone (North) Properties Ltd | Real estate | 2024 |
| Keystone Capital Invest Limited | Financial services | 2024 |
| Keystone Children's Services Ltd | Health & social care | 2025 |
| Keystone Consulting & Solutions Ltd | Professional & scientific | 2025 |
| Keystone Housing Services Ltd | Hospitality | 2024 |
| Keystone International Management Solutions Limited | Administrative & support | 2018 |
| Keystone Kingdom Ltd | Wholesale & retail | 2025 |
| Keystone Landscape Solutions Ltd | Administrative & support | 2025 |
| Keystone Maintenance Co Ltd. | Administrative & support | 1997 |
| Keystone Media Ltd | Information & communication | 2017 |
| Keystone Midlands Limited | Real estate | 2025 |
| Keystone Property Services Limited | Construction | 2025 |
| Keystone Roofing MID Ltd | Construction | 2025 |
| Keystone Strategic Consultancy Ltd | Professional & scientific | 2023 |
| Keystone-Epc Ltd | Construction | 2025 |
| Keystones Realty Ltd | Real estate | 2025 |
| Keystones Supported Living Ltd | Health & social care | 2020 |
| Keytax Accountants Hall Green Limited | Professional & scientific | 2026 |
| Keytax Accountants Ltd | Professional & scientific | 2010 |
| Keytax Ltd | Professional & scientific | 2010 |
| Keyvantus Digital Solutions Limited | Information & communication | 2017 |
| Keywood Group Limited | Financial services | 2012 |
| Kezza Kofee Limited | Hospitality | 2008 |
| KF Birmingham Limited | Hospitality | 2023 |
| KF Flooring Ltd | Construction | 2017 |
| KF Security Solutions Ltd | Administrative & support | 2025 |
| KF Serve Ltd | Wholesale & retail | 2025 |
| KFI Group Limited | Financial services | 2022 |
| Kfireworks Limited | Wholesale & retail | 2025 |
| Kfit Fitness Ltd | Arts & recreation | 2023 |
| KFM Ontime Logistics Ltd | Transport & logistics | 2025 |
| KFM Psych Services Ltd | Health & social care | 2016 |
| Kford Electrical Installations Limited | Construction | 2014 |
| KFT Estate Ltd | Real estate | 2020 |
| KG Auto Electronics Brum Ltd | Other services | 2024 |
| KG Automotive Services Ltd | Manufacturing | 2026 |
| KG Foods Limited | Hospitality | 2026 |
| KG Midlands Limited | Hospitality | 2025 |
| KG Plant Ltd. | Construction | 2025 |
| KGB Signs Ltd | Real estate | 2018 |
| KGB Wholesale Ltd | Manufacturing | 2026 |
| KGC Promotions Limited | Hospitality | 2024 |
| KGF Group Ltd | Financial services | 2026 |
| KGH Marketing Ltd | Wholesale & retail | 2023 |
| KGJ Commercial Insurance Services Limited | Financial services | 1998 |
| Kgmb Roofing Ltd | Construction | 2025 |
| KGN Management Group Ltd | Construction | 2024 |
| KGO Properties Ltd | Real estate | 2021 |
| Kgombiro Ltd | Health & social care | 2025 |
| Kgpg Holdings Limited | Health & social care | 2023 |
| Kgpg Investments Limited | Financial services | 2025 |
| KGR Koladiya Ltd | Wholesale & retail | 2026 |
| KGW Holdings Limited | Construction | 2016 |