| Kingsley Developments (UK) Limited | Construction | 2013 |
| Kingsley Distribution Limited | Wholesale & retail | 2010 |
| Kingsley Real Estate Limited | Construction | 2004 |
| Kingsley Travel Services Limited | Wholesale & retail | 1995 |
| Kingswood 36 Ltd | Wholesale & retail | 2015 |
| Kinsey Hearing Services Limited | Wholesale & retail | 2024 |
| Kinsman Courier Limited | Transport & logistics | 2025 |
| Kintota Ltd | Health & social care | 2020 |
| KIP Developments Ltd | Real estate | 2026 |
| Kipling Homes Ltd | Real estate | 2025 |
| Kirn Property Ltd | Real estate | 2018 |
| Kirra Consulting Ltd | Information & communication | 2019 |
| Kirton Investments Ltd | Financial services | 2021 |
| Kiss Construction (SW) Ltd | Construction | 2019 |
| Kiss of Metal Jewellery Ltd | Manufacturing | 2024 |
| Kissnature Ltd | Wholesale & retail | 2017 |
| KIT World Ltd | Manufacturing | 2008 |
| Kita's Kitchen Limited | Manufacturing | 2017 |
| Kitchen Door Swap Plymouth Limited | Construction | 2026 |
| Kitcheners Court Management Company Limited | Households | 1984 |
| Kitto's of Devon Limited | Manufacturing | 2001 |
| KJA Bar Group Ltd | Hospitality | 2025 |
| KJH Group SW Ltd | Manufacturing | 2024 |
| KJM Blades Ltd | Manufacturing | 2026 |
| Kjwilderscapes Ltd | Construction | 2024 |
| KK Commercial Diving and Maritime Limited | Professional & scientific | 2015 |
| KKN Consultancy Limited | Information & communication | 2018 |
| KLC Foods Ltd | Hospitality | 2018 |
| Klgt Enterprises Limited | Wholesale & retail | 2025 |
| KLI Tape and Jointing Ltd | Construction | 2023 |
| Klisw Commercial Ltd | Financial services | 2021 |
| Klisw Ltd | Real estate | 2011 |
| Kloof Limited | Wholesale & retail | 2012 |
| Kloxer Ltd | Construction | 2018 |
| KM Companies Ltd | Real estate | 2018 |
| KMB Hygiene Therapy Ltd | Health & social care | 2024 |
| Kmca Care Limited | Health & social care | 2019 |
| KMS Properties Plymouth Limited | Real estate | 2016 |
| KMT Muay Thai CIC | Education | 2025 |
| KN Cladding Solutions Limited | Construction | 2018 |
| Knapman Family Independent Funeral Directors Ltd | Administrative & support | 2017 |
| Kneebone Landscapes Ltd | Administrative & support | 2025 |
| Kneebone Trees Ltd | Administrative & support | 2021 |
| KNG and Co Limited | Wholesale & retail | 2023 |
| Knight Edmonds Ltd | Real estate | 2020 |
| Knightwoods Holdings Freeholds Limited | Real estate | 2023 |
| Knowthis Limited | Information & communication | 2019 |
| KNX Integration UK Ltd | Construction | 2009 |
| KO Apartments Ltd | Hospitality | 2022 |
| KOA Beauty Lounge Ltd | Other services | 2022 |
| Kodave Limited | Hospitality | 2025 |
| KOHRAY360 Ltd | Manufacturing | 2026 |
| Koii (UK) Ltd | Hospitality | 2025 |
| Koko Hair (Plymouth) Ltd | Other services | 2023 |
| Komner Limited | Arts & recreation | 2019 |
| Konfidence International Limited | Manufacturing | 1997 |
| Konrad Rybinski Ltd | Real estate | 2026 |
| Kook Interiors Ltd | Construction | 2019 |
| Kook Trading Co Limited | Wholesale & retail | 2025 |
| Korkosz Logistics Ltd | Transport & logistics | 2016 |
| Koru Performance Ltd | Other services | 2021 |
| Koster-Thomas Consulting Ltd | Professional & scientific | 2024 |
| Kovaro Liverpool Investments Ltd | Hospitality | 2023 |
| Kovaro UK Investments Ltd | Financial services | 2023 |
| Kovia Environmental Services Ltd | Professional & scientific | 2017 |
| Kovia Hub Ltd | Administrative & support | 2020 |
| Kovia Ltd | Professional & scientific | 2013 |
| KP Aviation Service’S Ltd | Manufacturing | 2019 |
| KPC & at Body Properties Limited | Real estate | 2016 |
| KPC (Southwest) Limited | Other services | 2014 |
| KPL Trading Limited | Administrative & support | 2012 |
| KR Creations Ltd | Manufacturing | 2023 |
| KR Property Limited | Construction | 2007 |
| Kraken Engineering Solutions Ltd | Information & communication | 2011 |
| Krakow PL1 Ltd | Wholesale & retail | 2024 |
| KRG Book-Keeping Ltd | Professional & scientific | 2026 |
| Kribow Limited | Professional & scientific | 2025 |
| KRN Engineering Limited | Extraterritorial | 2017 |
| KS Developments and Hire Ltd | Administrative & support | 2024 |
| KS Sports Therapy Ltd | Health & social care | 2025 |
| KSC Management Services Limited | Professional & scientific | 2021 |
| KSC Rigging Ltd | Other services | 2017 |
| KSK 1 Limited | Hospitality | 2020 |
| KSS Kitchens South West Ltd | Wholesale & retail | 2024 |
| KSS Motors Limited | Wholesale & retail | 2017 |
| Kstepien Haulage Ltd | Transport & logistics | 2023 |
| KT Construction (SW) Ltd | Construction | 2018 |
| KT Properties SW Ltd | Construction | 2021 |
| Kudos SW Limited | Construction | 2015 |
| Kulala Ltd | Health & social care | 2023 |
| Kurd CUT 1 Ltd | Other services | 2025 |
| Kurd Fade PL1 Ltd | Other services | 2025 |
| Kurdo Pizza Ltd | Hospitality | 2017 |
| Kuvli Grill Limited | Hospitality | 2019 |
| KW Brothers (UK) Limited | Wholesale & retail | 2015 |
| KW Kitchens SW Ltd | Construction | 2019 |
| KW Letts Ltd | Extraterritorial | 2022 |
| KW Pro Plumbing Ltd | Energy | 2019 |
| KW Systems South West Limited | Construction | 2011 |
| KWA Maintenance and Groundworks Ltd | Construction | 2026 |