| JK Custom Carpentry Ltd | Construction | 2022 |
| JK Outdoors Ltd | Wholesale & retail | 2024 |
| JLR Rural Ltd | Agriculture & fishing | 2025 |
| JM Amusement Machines Ltd | Arts & recreation | 2019 |
| JMB Copywriting Ltd | Professional & scientific | 2020 |
| JMC Metals Ltd | Financial services | 2021 |
| JMV Solutions Ltd | Information & communication | 2006 |
| JN Building Services Limited | Construction | 1989 |
| JN Control Systems Limited | Construction | 2012 |
| JN Electrical Limited | Professional & scientific | 2003 |
| Jnlb Construction & Property Management Ltd | Construction | 2019 |
| JNW Ltd | Information & communication | 2025 |
| JO Hooper Ltd | Administrative & support | 2022 |
| John Craxford (Plant Hire) Limited | Construction | 1975 |
| John Fuller Trees Limited | Agriculture & fishing | 2010 |
| John Garner Merchant Services Limited | Other services | 2021 |
| John Nuttall Ltd | Financial services | 2010 |
| Johns Farms Limited | Agriculture & fishing | 2023 |
| Jolanta (Devon) Limited | Health & social care | 2025 |
| Jolin Limited | Real estate | 1978 |
| JON Brown Consultancy Ltd | Health & social care | 2026 |
| JON Cleave Limited | Other services | 2005 |
| JON Edward Hair Ltd | Other services | 2014 |
| Jonathan Harris Limited | Construction | 2013 |
| Jonathan Long Hand Pallet Truck Services Limited | Manufacturing | 2015 |
| Jones & SON Pest Control Supplies Ltd. | Manufacturing | 1999 |
| Joseph Bishop Limited | Information & communication | 2015 |
| Josh Critchell General Building and Plastering Ltd | Construction | 2025 |
| Joy-Led Urbanism CIC | Professional & scientific | 2026 |
| Joyful Things Ltd | Manufacturing | 2025 |
| Joyner Holdings Limited | Financial services | 2020 |
| Joyner's Land & Properties Limited | Real estate | 2020 |
| Joyners Plants Limited | Wholesale & retail | 2001 |
| JP & EC Wood Investments Limited | Real estate | 2024 |
| JP Property Cleaning Ltd | Administrative & support | 2026 |
| Jprs (South West) Limited | Financial services | 2010 |
| JPS Arboriculture Ltd | Administrative & support | 2026 |
| JPV South West Limited | Professional & scientific | 2023 |
| JR Loudspeakers Limited | Manufacturing | 2015 |
| JR Transport & Sales Ltd | Agriculture & fishing | 2025 |
| JRH Farming Limited | Agriculture & fishing | 2016 |
| JS Fire and Security Services Ltd | Construction | 2022 |
| JS Marine Investments Ltd | Professional & scientific | 2021 |
| JS Plumbing Heating & Renewables Limited | Construction | 2023 |
| JSM Smile Ltd | Health & social care | 2026 |
| JST Agency Ltd | Agriculture & fishing | 2016 |
| JT Consultancy Solutions Ltd | Professional & scientific | 2024 |
| JTD Brickwork Limited | Construction | 2019 |
| JTP Joinery Limited | Manufacturing | 2011 |
| JTW Real Estate Ltd | Real estate | 2023 |
| Just Events Ltd | Arts & recreation | 2011 |
| Just One Drop Limited | Wholesale & retail | 2016 |
| Just Resin Ltd | Construction | 2025 |
| Just Tree Education Limited | Education | 2023 |
| Just Vanz Limited | Wholesale & retail | 2014 |
| Justnine Limited | Real estate | 2013 |
| JVH Hospitality Ltd | Hospitality | 2024 |
| JVM Tech Limited | Information & communication | 2013 |
| JZ Developments Ltd | Construction | 2022 |
| K & I Medical Limited | Health & social care | 2009 |
| K Aesthetics Training Academy Limited | Other services | 2024 |
| K Blasting Ltd | Administrative & support | 2003 |
| K C Engineering Services (S.W.) Ltd | Manufacturing | 2011 |
| K G Buckley Fixings Limited | Financial services | 2024 |
| K Mason Holdings Limited | Financial services | 2004 |
| K Platforms Ltd | Information & communication | 2024 |
| K&S S Limited | Manufacturing | 2025 |
| K2 Hairdressing Limited | Other services | 2013 |
| Kaboodles Hairdressing Torquay Limited | Other services | 2019 |
| Kach Business Park Soby Court Management Company Limited | Real estate | 2017 |
| Kahuna Property Management Ltd | Real estate | 2024 |
| KAL & BAL Limited | Real estate | 2015 |
| Kali MA Designs Limited | Wholesale & retail | 1998 |
| Kaluba Ltd | Professional & scientific | 2019 |
| Kaming 626 Limited | Hospitality | 2023 |
| Karate Academy Ltd | Arts & recreation | 2007 |
| Kariba Pool Ltd | Arts & recreation | 2021 |
| Karuna Teachings Limited | Health & social care | 1999 |
| Kate Bainbridge Limited | Wholesale & retail | 2007 |
| Katzecure Services Limited | Manufacturing | 2018 |
| KB Holdings 1 Ltd | Financial services | 2025 |
| KC Financial Partnering Limited | Professional & scientific | 2026 |
| KDM Security Limited | Financial services | 2017 |
| KE Maintenance Limited | Construction | 2025 |
| KE3 Limited | Real estate | 2017 |
| Keepsy Box Ltd | Wholesale & retail | 2025 |
| Kegin Limited | Real estate | 2019 |
| Kellow Business Services Limited | Wholesale & retail | 2013 |
| Kemp Mews Management Company Limited | Households | 2002 |
| Kennaway Estates 2 Ltd | Real estate | 2016 |
| Kennaway Estates Limited | Real estate | 2016 |
| Kennaway Management Co Limited | Real estate | 2016 |
| Kennedy Associates Ltd | Professional & scientific | 2024 |
| Kennford Estates Ltd | Real estate | 2016 |
| Kennicott Place Ltd | Construction | 2020 |
| Kenyon Southwest Limited | Construction | 2017 |
| Kerrie Marie Limited | Real estate | 1997 |
| Kesterbrooke Construction Limited | Construction | 2009 |
| Kevin Thomas Electrical Limited | Construction | 2022 |
| Key Innovate Limited | Administrative & support | 2020 |