| KCP Keystone CIC | Education | 2014 |
| KCT Carpentry and Building Ltd | Construction | 2026 |
| KCV Pubs Ltd | Hospitality | 2025 |
| KD Enterprise Southwest Limited | Wholesale & retail | 2025 |
| KDS Hospitality Ltd | Hospitality | 2021 |
| Keane & Parker Ltd | Real estate | 2017 |
| KEC Group Limited | Construction | 2015 |
| Keefe & Lewis Limited | | 1960 |
| Keep Calm Carpentry Ltd | Administrative & support | 2017 |
| Keep Cleaning Plymouth Ltd | Administrative & support | 2024 |
| Keezee Limited | Manufacturing | 2025 |
| Keith Cook Architect Limited | Professional & scientific | 2012 |
| Keith Preston Co Limited | Real estate | 2009 |
| Kellar Formwork Ltd | Administrative & support | 2023 |
| Kellett Group Ltd | Arts & recreation | 2026 |
| Kelly Bray Ltd | Wholesale & retail | 2024 |
| Kelly Bray Property Management Ltd | Real estate | 2026 |
| Kelly Elesmore Interior Design Ltd | Professional & scientific | 2021 |
| Kelly Property Services (Plymouth) Ltd | Construction | 2014 |
| Kempas Collective Limited | Manufacturing | 2025 |
| Kenleys Day Nursery Limited | Education | 2011 |
| Kenmarehr Ltd | Administrative & support | 2017 |
| Kenny D Clean Ltd | Administrative & support | 2024 |
| Kenny Weather Consulting Ltd | Professional & scientific | 2016 |
| Kensa Health Analytics Ltd | Information & communication | 2025 |
| Kensa Health Holdings Ltd | Information & communication | 2024 |
| Kensa Health Home Care Ltd | Health & social care | 2015 |
| Kensa Health Virtual Care Ltd | Health & social care | 2025 |
| Kensha Holdings Ltd | Real estate | 2023 |
| Kensworth Limited | Wholesale & retail | 2026 |
| Kent and Warwick Limited | Administrative & support | 2015 |
| Kenwyn Management Limited | Households | 2018 |
| Kenya Kitchen Ltd | Hospitality | 2018 |
| Kernick Walled Garden Management Company Limited | Households | 2003 |
| Kernow (Torpoint) Management Company Limited | Households | 1982 |
| Kernow Gate (Plymouth) Management Company Limited | Real estate | 2014 |
| Kernow Heart LLP | | 2019 |
| Kernow Media Limited | Other services | 2020 |
| Kernow Services Design Limited | Construction | 2021 |
| Kerrier Investments Limited | Real estate | 1963 |
| Kerrier Trading Limited | Professional & scientific | 2018 |
| Kershaw Consultancy Services Ltd | Professional & scientific | 2021 |
| KES (SW) Limited | Construction | 2013 |
| Kesk Û SOR Collective Ltd | Wholesale & retail | 2026 |
| Keswick Stores Ltd | Wholesale & retail | 2012 |
| Kettle Co Contracts Ltd | Construction | 2021 |
| KEV Ward & Sons Ltd | Administrative & support | 2020 |
| Kevin Barnes Ltd | Other services | 2003 |
| Kevin From Grimsby Limited | Arts & recreation | 2013 |
| Kevin Mason Roofing Services Ltd | Construction | 2023 |
| Kevin Ranford Ltd | Transport & logistics | 2007 |
| Key Business Co. Ltd. | Professional & scientific | 2020 |
| Key Cutter Games Limited | Arts & recreation | 2022 |
| Key Estates (SW) Limited | Financial services | 2017 |
| KEY2SAFETY Ltd | Construction | 2017 |
| Keyla Remache Ltd | Wholesale & retail | 2025 |
| Keziah Jones Touring Ltd | Arts & recreation | 2017 |
| KF Multitrade Ltd | Construction | 2016 |
| Kfbm Contractors Ltd | Construction | 2015 |
| KFS (Southwest) Limited | Construction | 2007 |
| Kgstudio Ltd | Information & communication | 2022 |
| Khatwa ENT Limited | Health & social care | 2016 |
| Khatwa Investment Management Ltd | Real estate | 2022 |
| Khodiyarkrupa Limited | Wholesale & retail | 2023 |
| KHP (Bramdean) Limited | Real estate | 2021 |
| KHP (ST Lawrence) Limited | Real estate | 2017 |
| KHP (Trinity House) Limited | Construction | 2020 |
| KHP (Wyndham Hall) Limited | Construction | 2017 |
| KHP Group (Holdings) Limited | Financial services | 2017 |
| KHP Group (Trading) Ltd | Construction | 2017 |
| KHP Property Investments Ltd | Real estate | 2017 |
| Khph Ltd | Hospitality | 2023 |
| Khwam SUK Limited | Health & social care | 2026 |
| KI Martial Arts Holdings Limited | Financial services | 2024 |
| KI Martial Arts Limited | Wholesale & retail | 2001 |
| Kick Property Solutions Limited | Real estate | 2018 |
| Kies Electrical Services Ltd | Professional & scientific | 2015 |
| Killed Pixel Ltd | Professional & scientific | 2025 |
| Kilnsmiths Ltd | Manufacturing | 2023 |
| Kilo Solutions Ltd | Information & communication | 2020 |
| Kimberley Rose Bridal Boutique Ltd | Wholesale & retail | 2018 |
| Kimiver Ltd | Wholesale & retail | 2024 |
| Kind & KID London Ltd | Wholesale & retail | 2025 |
| Kindercodes Limited | Professional & scientific | 2023 |
| Kindred Spirit Consultancy Limited | Professional & scientific | 2002 |
| Kinetic JAM Ltd | Information & communication | 2019 |
| Kinetixs Tech Ltd | Information & communication | 2026 |
| King Property Maintenance Ltd | Construction | 2025 |
| King Welsh Ltd | Real estate | 2016 |
| Kingdom Services for Children Ltd | Health & social care | 2025 |
| Kingfisher (South West) Limited | | 1985 |
| Kingfisher House Plymouth Management Company Limited | Households | 2007 |
| Kingfisher Quay Management Company Limited | Households | 2004 |
| Kingpest Control & Wildlife Management Ltd | Administrative & support | 2025 |
| Kingsbridge Sterling Ltd | Financial services | 2022 |
| Kingsbury Investment Management Ltd | Real estate | 2020 |
| Kingsbury Lake Limited | Extraterritorial | 2008 |
| Kingsdon Hall Management (Exmouth) Limited | Households | 1985 |
| Kingsley Court (Torquay) Limited | Households | 2007 |
| Kingsley Developers Limited | Construction | 1982 |