| JSM Pointing Limited | Arts & recreation | 2018 |
| JSS (Exeter) Limited | Real estate | 2010 |
| JSS Exeter (Development Land and New Homes) Limited | Real estate | 2010 |
| Jssem Limited | Financial services | 2018 |
| Jstep CIC | Other services | 2021 |
| JTA Homes (Southern) Limited | Construction | 2013 |
| Jtec Management Ltd | Administrative & support | 2019 |
| Jtfu Properties Ltd | Real estate | 2021 |
| JTL Energy Limited | Construction | 2020 |
| JTL Stockist Ltd | Wholesale & retail | 2025 |
| Jtlb Engineering Ltd. | Manufacturing | 2017 |
| JTR Design and Build Limited | Manufacturing | 2017 |
| JTR Holdings Limited | Financial services | 2017 |
| Jubilee Inn (Pelynt) Ltd | Hospitality | 2024 |
| Judgeproud Limited | Construction | 1995 |
| Juicekingdrinks Ltd | Manufacturing | 2023 |
| Jukpw Ltd | Wholesale & retail | 2022 |
| Juliet Corbett Consulting Ltd | Professional & scientific | 2020 |
| Jumpin Janners Ltd | Hospitality | 2025 |
| Junipod Limited | Real estate | 2019 |
| Jupiter Electricals Limited | Construction | 2020 |
| Jurassic Drinks Ltd | Manufacturing | 2002 |
| Jurassic Fitness Ltd | Arts & recreation | 2020 |
| Jurassic Group Ltd | Financial services | 2024 |
| Jurassic Recruitment Ltd | Administrative & support | 2019 |
| Jurassic Waste Ltd | Water & waste | 2024 |
| Jurston Fields Management Company Limited | Households | 2018 |
| Just Been Laid Ltd | Wholesale & retail | 2024 |
| Just Economics Research Ltd | Other services | 2011 |
| Just Logistics (SW) Ltd | Transport & logistics | 2018 |
| Just Logistics Group Ltd | Transport & logistics | 2021 |
| Just Thai Ltd | Hospitality | 2023 |
| Just Thai Takeaway Limited | Hospitality | 2025 |
| Just Water Limited | Manufacturing | 2002 |
| Just Waxing UK Ltd | Other services | 2012 |
| Justpost Ltd | Information & communication | 2026 |
| Jvco 1 Ltd | Construction | 2023 |
| Jvco 2 Ltd | Construction | 2023 |
| Jvco 3 Ltd | Construction | 2023 |
| JVK Motors Ltd | Wholesale & retail | 2024 |
| Jvmc Holding Ltd | Real estate | 2025 |
| Jvmc Property Ltd | Real estate | 2024 |
| JVP Commercial Ltd | Real estate | 2022 |
| JVP Properties Ltd | Real estate | 2021 |
| JVS Stoves & Chimneys Limited | Construction | 2020 |
| JW Advisory and Holdings Limited | Wholesale & retail | 2024 |
| JW Antiques Limited | Wholesale & retail | 2010 |
| JWP Exeter Limited | Wholesale & retail | 2000 |
| Jwpr Properties Limited | Real estate | 2002 |
| JWS Counselling Ltd | Health & social care | 2022 |
| JWS Industrial & Welding Supplies Limited | Wholesale & retail | 2010 |
| JWT Projects Ltd | Construction | 2025 |
| JZ Aero Tech Ltd | Manufacturing | 2025 |
| K & a Parker Ltd | Education | 2015 |
| K & B (SW) Ltd | Hospitality | 2024 |
| K Agricultural and Building Services Limited | Other services | 2020 |
| K B Recruitment SW Ltd | Administrative & support | 2007 |
| K Baker Construction Ltd | Construction | 2024 |
| K M Scott Developments Limited | Construction | 2005 |
| K Palmer Logistics Ltd | Transport & logistics | 2023 |
| K Skinner Electrical Ltd | Construction | 2026 |
| K Star Solutions Ltd | Water & waste | 2009 |
| K T Exercises Ltd | Arts & recreation | 2018 |
| K&A Medical Services Ltd | Health & social care | 2026 |
| K&K BE My Guest Ltd | Hospitality | 2026 |
| K&K Products Ltd | Wholesale & retail | 2024 |
| K&P Cherry Limited | Hospitality | 2022 |
| K&T (SW) Ltd | Hospitality | 2017 |
| K&Y Property Ltd | Households | 2018 |
| K'Nett Limited | Real estate | 2025 |
| K.B. R&C Limited | Construction | 2021 |
| K.F. Bartlett Trustees Limited | Professional & scientific | 2023 |
| K.F.Bartlett Limited | Construction | 1959 |
| K.Habb Limited | Real estate | 2013 |
| Kadampa Meditation Centre Exeter | Education | 1995 |
| Kaffa Ltd | Financial services | 2026 |
| Kahuna Restaurant Limited | Hospitality | 2012 |
| Kahz Holdings UK Limited | Real estate | 2020 |
| Kahz UK Limited | Real estate | 2020 |
| Kairos Accountants Ltd | Professional & scientific | 2026 |
| Kaleider Limited | Arts & recreation | 2012 |
| Kaleidoscope Co-Living Limited | Real estate | 2018 |
| Kaleidoscope Property Development Limited | Real estate | 2025 |
| Kaleidoscope Serviced Accommodation Limited | Real estate | 2021 |
| Kamal Healthcare Limited | Health & social care | 2026 |
| Kamil Ltd | Transport & logistics | 2024 |
| Kamrul Spice Ltd | Hospitality | 2020 |
| KAN Vision Property Management Ltd | Real estate | 2023 |
| Kandy Group Trading Ltd | Wholesale & retail | 2025 |
| Kandytoys Limited | Wholesale & retail | 2010 |
| KANGAL58 Ltd | Hospitality | 2026 |
| Kantara Education Limited | Education | 2015 |
| Kapya Ltd | Wholesale & retail | 2019 |
| Karl Tooley Ltd | Construction | 2009 |
| Karl Whittaker Limited | Health & social care | 2018 |
| Karowi Ltd | Wholesale & retail | 2011 |
| Kassam HIP Limited | Health & social care | 2020 |
| Kate Holland Books Ltd | Other services | 2017 |
| Kate Stevens Ltd | Professional & scientific | 2020 |
| Kate Weiler Ltd | Education | 2018 |