| J J LEE Ltd | Information & communication | 2016 |
| J L Home & Care Services Ltd | Health & social care | 2011 |
| J M Evans Glazing Limited | Construction | 2007 |
| J Richardson Hair Limited | Other services | 2018 |
| J Sheerin Consultancy Ltd | Administrative & support | 2016 |
| J. James Mackie Limited | Wholesale & retail | 2020 |
| Jack the Farrier Ltd | Professional & scientific | 2022 |
| Jackson Bakery Exmouth Ltd | Wholesale & retail | 2024 |
| Jadazael Ltd | Information & communication | 2026 |
| Jago Contract Cleaning Ltd | Administrative & support | 2025 |
| James Rickard Litigation Ltd | Professional & scientific | 2019 |
| James Wilson Africa Travel Ltd | Administrative & support | 2023 |
| JAR Express Ltd | Transport & logistics | 2013 |
| JBM Wealth Management Ltd | Professional & scientific | 2018 |
| JBS Food Consulting Limited | Hospitality | 2015 |
| JC45CONSULTING.COM Limited | Professional & scientific | 2016 |
| JCM Aviation Consultancy Limited | Administrative & support | 2026 |
| JD Homes (Dartmouth) Ltd | Construction | 2018 |
| JDC Group (SW) Limited | Real estate | 2025 |
| Jeab Devon Limited | Health & social care | 2015 |
| JEB Building Services Ltd | Construction | 2026 |
| Jem-Nk Ltd | Real estate | 2021 |
| Jeremy Sharland Builders Limited | Construction | 2024 |
| JG Ecological Surveys Limited | Professional & scientific | 2008 |
| JIM Davis Carpenters Limited | Construction | 2004 |
| JKM5 Ltd | Professional & scientific | 2026 |
| Jmdl Construction Ltd | Construction | 2025 |
| JMJ Trio Ltd | Transport & logistics | 2016 |
| JNA South West Ltd | Hospitality | 2020 |
| JOG on Ltd | Arts & recreation | 2020 |
| Jomile Services Ltd | Professional & scientific | 2014 |
| Jordan Construction (SW) Limited | Construction | 2026 |
| Josh Hodge 15 Ltd | Arts & recreation | 2024 |
| Joyce Made Ltd | Manufacturing | 2023 |
| JP PUB Solutions Ltd | Hospitality | 2013 |
| JP Specialists Limited | Real estate | 2014 |
| JR Pitman Building Ltd | Construction | 2021 |
| JRV Properties Limited | Real estate | 2019 |
| JS Electrics Limited | Construction | 2006 |
| Juno Build Ltd | Construction | 2025 |
| Juno Land and Homes Ltd | Construction | 2023 |
| Jurassic IT Ltd | Information & communication | 2021 |
| Jurassic Safari Limited | Real estate | 2021 |
| Jzee Limited | Financial services | 2016 |
| K & C Flooring Ltd | Wholesale & retail | 2022 |
| K & D Creations Ltd | Wholesale & retail | 2022 |
| K B M Investments Limited | Real estate | 2002 |
| K J Proctor Building Services Limited | Construction | 2008 |
| Kaia Property Ltd | Real estate | 2024 |
| Kath Rath UK Limited | Wholesale & retail | 2018 |
| KB (Devon) Limited | Hospitality | 2019 |
| Keeble Incorporated Ltd | Professional & scientific | 2016 |
| Keith Norsworthy Limited | Construction | 2010 |
| Kelliwik Childcare Ltd | Health & social care | 2025 |
| Kelly Bray Developments Limited | Construction | 2026 |
| Kfxmedia Ltd | Other services | 2025 |
| King Rollo Films Limited | Information & communication | 1992 |
| Kingfisher (Pinhoe) Limited | Households | 1991 |
| Kings Garden and Leisure (Wellington) Limited | Wholesale & retail | 2024 |
| Kings Garden and Leisure Limited | Wholesale & retail | 2004 |
| Kinterra Group Limited | Real estate | 2025 |
| Kiva and ZEN Bridal Devon Ltd | Wholesale & retail | 2020 |
| KLC Cleaning Services Ltd | Administrative & support | 2022 |
| KMC Builders & Fire Contractors Ltd | Construction | 2021 |
| Knoll (Exmouth RTM Company) Limited | Real estate | 2008 |
| Koenig Consultants Limited | Professional & scientific | 2019 |
| Kokoro Collective Group Ltd | Other services | 2022 |
| Konnectkind Limited | Information & communication | 2026 |
| L & C Enterprises Limited | Other services | 2008 |
| L J Sowden Building Services Ltd | Construction | 2022 |
| Ladram Bay Caravans Limited | Administrative & support | 2013 |
| Laila Barbers Ltd | Other services | 2025 |
| Lamberts Car Transport Ltd | Wholesale & retail | 2025 |
| Lamberts Used Car Sales Ltd | Wholesale & retail | 2024 |
| Landmyth Ltd | Administrative & support | 2026 |
| Lapford (SW) Ltd | Real estate | 2023 |
| Launchpad (SW) C.I.C. | Hospitality | 2017 |
| Laurel Property Rental Ltd | Real estate | 2026 |
| Laurel Rentals LLP | | 2026 |
| Lauren Robinson Ltd | Professional & scientific | 2023 |
| Laydynfrase Limited | Hospitality | 2021 |
| LCW Holdings South West Limited | Financial services | 2016 |
| LDP Carpentry Limited | Construction | 2016 |
| League of GENTLEMEN23 Ltd | Other services | 2025 |
| LEAGUEOFGENTLEMEN26 Ltd | Other services | 2026 |
| Leeo Consulting Limited | Information & communication | 2011 |
| Legh House Limited | Health & social care | 2023 |
| Legion Fitness Limited | Other services | 2022 |
| Lens Cleaning Services Ltd | Administrative & support | 2019 |
| Let's FRY Away Ltd | Hospitality | 2017 |
| Let's Talk Mobiles Limited | Wholesale & retail | 2018 |
| LI & YAN Limited | Hospitality | 2016 |
| Liam Ellis Roofing Ltd | Construction | 2019 |
| Lilly Nails 53 Ltd | Other services | 2024 |
| Lilypod Retreats Limited | Construction | 2015 |
| Lima Lounges Ltd | Hospitality | 2018 |
| Lime Bay Trading Company Limited | Professional & scientific | 2009 |
| Lime Cottage, Exmouth, Ltd | Households | 2012 |
| Links Estate Agents Limited | Real estate | 2012 |
| Lion House Management (Exmouth) Limited | Households | 1970 |