| Key's World Food Store Limited | Wholesale & retail | 2024 |
| Keystone Advisory Group Limited | Professional & scientific | 2025 |
| Keystone Technical Consulting Limited | Information & communication | 2026 |
| KGI Limited | Construction | 2000 |
| KHP Professional Services Ltd | Construction | 2017 |
| Kick-On Shipping Ltd | Transport & logistics | 2023 |
| Killa Villa Ltd | Professional & scientific | 2025 |
| Kiltyco Ltd | Arts & recreation | 2019 |
| Kind Group Limited | Administrative & support | 2021 |
| Kindred Mugs Limited | Wholesale & retail | 2025 |
| Kineta Tea Limited | Manufacturing | 2018 |
| Kingbourne LLP | | 2017 |
| Kingdon Holdings Limited | Extraterritorial | 2015 |
| Kings Court Management Company (Paignton) Limited | Hospitality | 2001 |
| Kingsbridge Lane Management Company Limited | Households | 1993 |
| Kingschurch Developments Ltd | Construction | 2022 |
| Kingsdart Projects Limited | Real estate | 1992 |
| Kingskerswell Action Group CIC | Health & social care | 2026 |
| Kingskerswell Dental Centre Ltd | Health & social care | 2023 |
| Kingskerswell Estate Agents Ltd | Real estate | 2013 |
| Kingskerswell Properties Limited | Extraterritorial | 1962 |
| Kingskerswell Property Management Limited | Real estate | 1946 |
| Kingskerswell Sprayworx Limited | Wholesale & retail | 2016 |
| Kingsmead Construction Limited | Real estate | 1977 |
| Kingsmead Developments (SW) Limited | Professional & scientific | 2006 |
| Kingsmead Holdings (SW) Limited | Financial services | 2021 |
| Kingsteignton Glass Limited | Construction | 2009 |
| Kingsteignton Medical Limited | Health & social care | 2007 |
| Kingsteignton Plastic Centre Limited | Construction | 2004 |
| Kingsteignton Swimming Pool and Recreational Association Limited | Arts & recreation | 2014 |
| Kingswater Court Limited | Households | 1992 |
| Kirhanzah Ltd | Extraterritorial | 2025 |
| Kirkcroft Ltd | Professional & scientific | 2015 |
| Kirsty & Mackay Limited | Real estate | 2023 |
| Kitchen Cover Limited | Administrative & support | 2018 |
| Kittoes Management Company Limited | Households | 2019 |
| KJG Fishing Ltd | Agriculture & fishing | 2016 |
| KJT Holdings Limited | Agriculture & fishing | 2016 |
| KL Group (SW) Ltd | Financial services | 2019 |
| KM Developments (South West) Limited | Construction | 2021 |
| KM Newton Limited | Hospitality | 2019 |
| Kmac Surfacing Ltd. | Construction | 2017 |
| KMC Pharma Ltd | Wholesale & retail | 2024 |
| Kmcw Limited | Professional & scientific | 2004 |
| Knead to Connect CIC | Hospitality | 2018 |
| Knight Industries 2000 Limited | Health & social care | 2025 |
| Knighton Cleaning Services (SW) Ltd | Administrative & support | 2015 |
| Knighton Property Ltd | Real estate | 2016 |
| Knightrock Contracting Ltd | Construction | 2023 |
| Kodal International Limited | Information & communication | 2019 |
| Koffihalma Ltd | Health & social care | 2023 |
| Koggi Solutions Ltd | Administrative & support | 2025 |
| Kookaburra Homes Limited | Construction | 2021 |
| Koota Juice Ltd | Wholesale & retail | 2021 |
| Korba Design UK Ltd | Manufacturing | 2013 |
| Koru Connections Limited | Hospitality | 2014 |
| Kpva Limited | Professional & scientific | 2020 |
| Kraken Consulting Limited | Information & communication | 2015 |
| Krowdthink Limited | Information & communication | 2011 |
| Krystal Leisure Rentals Ltd | Administrative & support | 2025 |
| KS Johnston Limited | Construction | 2024 |
| KS Stairlifts Limited | Manufacturing | 2009 |
| Ksgsco Holdings Ltd | Real estate | 2023 |
| Kubelet Ltd | Extraterritorial | 2022 |
| Kusuri Holdings Limited | Financial services | 2019 |
| Kusuri Products Limited | Wholesale & retail | 2001 |
| Kusuri Sales Limited | Wholesale & retail | 2019 |
| KW Thai Food Ltd | Hospitality | 2025 |
| KW01 Solutions Ltd | Real estate | 2024 |
| Kyash Ltd | Wholesale & retail | 2022 |
| Kynaston Auto Services (Exeter) Ltd | Wholesale & retail | 2025 |
| Kynaston Commercials (Exeter) Ltd | Wholesale & retail | 2025 |
| Kynaston Holdings Ltd | Financial services | 2025 |
| L & R Amusements Ltd | Arts & recreation | 2016 |
| L & R Leisure Ltd | Arts & recreation | 2018 |
| L M Property Renovations Ltd | Construction | 2015 |
| L M Property Rentals Ltd | Real estate | 2016 |
| L N L Property Investments Limited | Real estate | 2020 |
| L&H Properties (Brixham) Limited | Construction | 2022 |
| L&H SUB Properties (Brixham) Limited | Real estate | 2024 |
| L&Rb Property Ltd | Real estate | 2024 |
| L.M.O Consulting Ltd | Professional & scientific | 2025 |
| Laburnum SPV Ltd | Construction | 2019 |
| Lackfords Limited | Administrative & support | 2017 |
| Lacuna Analysis Limited | Information & communication | 2025 |
| Ladders Always Required Ltd | Arts & recreation | 2025 |
| Lamaro Bakery Ltd | Wholesale & retail | 2017 |
| Lamars Decorating Contractors Ltd | Construction | 2002 |
| Lambert Trading Ltd | Wholesale & retail | 2025 |
| Lamps & Tubes Limited | Transport & logistics | 1993 |
| Lancelot Support Ltd | Health & social care | 2024 |
| Land Phoenix Ltd | Professional & scientific | 2022 |
| Land Promotion Group Ltd | Professional & scientific | 2017 |
| Landmark Art Ltd | Information & communication | 2022 |
| Landscore Construction Ltd | Construction | 2025 |
| Landsteps Limited | Other services | 1974 |
| Langdon Fishing Limited | Agriculture & fishing | 2020 |
| Langdon Homes Brixham Limited | Households | 2020 |
| Langholm Lodge Freehold Company Limited | Households | 2022 |
| Langmead Developments Limited | Construction | 2018 |