| Huxley Hub Ltd | Real estate | 2020 |
| Hvac South West Ltd | Construction | 2026 |
| HVM Property Limited | Construction | 1965 |
| HW Lettings & Management Ltd | Households | 2026 |
| HWR Events Ltd | Extraterritorial | 2015 |
| Hydaspes Group Ltd | Information & communication | 2026 |
| Hydronics Limited | Construction | 2015 |
| Hyll OP Co Ltd | Professional & scientific | 2025 |
| I a Construction Services (SW) Ltd | Construction | 2014 |
| I-7HEALTHCARE Ltd | Transport & logistics | 2023 |
| IAG Power Services Ltd | Professional & scientific | 2011 |
| IAN Lamb Ltd | Arts & recreation | 2018 |
| IAN Thomas (Compliance Consultancy) Limited | Transport & logistics | 2014 |
| Ibiza Shawarma Ltd | Hospitality | 2026 |
| Ibps Draughting Limited | Construction | 2002 |
| Ibps Holdings Limited | Financial services | 2025 |
| Ice Cream + Bubbles Ltd | Hospitality | 2025 |
| ID Hughes Surveying Limited | Professional & scientific | 2018 |
| Ideal Bedrooms Limited | Construction | 2003 |
| Ifab Devon Ltd | Health & social care | 2020 |
| Ilead Mobile Limited | Wholesale & retail | 2014 |
| Ilfracombe Coastal Cruises Limited | Arts & recreation | 2012 |
| Ilfracombe Dive and Fishing Charters Ltd | Agriculture & fishing | 2015 |
| Ilfracombe Sea Safari Limited | Arts & recreation | 2017 |
| Imagination Avenue Play Cafe Ltd | Hospitality | 2025 |
| Imagination Avenue Play Village Ltd | Arts & recreation | 2025 |
| IMB Holding Limited | Wholesale & retail | 2019 |
| Impact for Change Holdings Ltd | Financial services | 2026 |
| Imperial Court Management (Lynton) Limited | Households | 1992 |
| IN Focus PM Ltd | Professional & scientific | 2012 |
| Independent Computer Services (South West) Limited | Information & communication | 2010 |
| Independent Waves Ltd | Health & social care | 2024 |
| Indigo & Finch Limited | Administrative & support | 2017 |
| Influence Sports Limited | Professional & scientific | 2012 |
| Infotech (SW) Ltd | Wholesale & retail | 2010 |
| Ingenium Pharmastudios Ltd | Professional & scientific | 2019 |
| Injectorserv Limited | Wholesale & retail | 2016 |
| Innovative Aesthetic Ltd | Arts & recreation | 2019 |
| Inovara AI Ltd | Information & communication | 2025 |
| Insight Aerial Consultancy Ltd | Information & communication | 2024 |
| Inspira Digital Limited | Information & communication | 2009 |
| Inspire Alternative Provision Limited | Education | 2023 |
| Inspire South West Community Interest Company | Education | 2015 |
| Inspired Building Contractors Ltd | Construction | 2006 |
| Inspired Hotels Limited | Hospitality | 2011 |
| Instow Jetty Limited | Administrative & support | 2009 |
| Instow Marine Services Limited | Manufacturing | 2005 |
| Intelligent Financial Services Ltd | Financial services | 2005 |
| Interface Safety Ltd | Professional & scientific | 2000 |
| Interior Therapy Ltd | Real estate | 2023 |
| International Trade Matters Limited | Professional & scientific | 2017 |
| Into the Blue (SW) Limited | Wholesale & retail | 2006 |
| Intsol Limited | Agriculture & fishing | 2007 |
| Inventive Print Solutions Ltd | Administrative & support | 2004 |
| Inview Assets Limited | Information & communication | 2022 |
| Invigorate Fit Ltd | Manufacturing | 2025 |
| Irelands Motorcycles Ltd | Wholesale & retail | 2020 |
| Isca Elevators Limited | Professional & scientific | 2011 |
| IT SOS Ltd | Professional & scientific | 2005 |
| IT3 Ltd | Information & communication | 2009 |
| Itk.Media Ltd | Professional & scientific | 2020 |
| IVY Infusion Therapy Ltd | Health & social care | 2025 |
| J & S Warranty Services Limited | Construction | 2017 |
| J and M Sharp Ltd | Hospitality | 2023 |
| J I Services Ltd | Construction | 2024 |
| J J Rockford Limited | Construction | 2016 |
| J K Plumbing & Chimney Services Limited | Construction | 2005 |
| J Leigh Holdings Ltd | Financial services | 2025 |
| J P Tech Services Limited | Construction | 2016 |
| J Rowe Property Ltd | Real estate | 2021 |
| J Thompson Electrical Contractors Ltd | Construction | 2016 |
| J&C Properties Barnstaple Ltd | Construction | 2015 |
| J&J L Properties Limited | Real estate | 2015 |
| J. Hall Care Limited | Health & social care | 2009 |
| J.A. Budd Limited | Construction | 2006 |
| J.J Asian Supermarket Ltd | Wholesale & retail | 2022 |
| J.P.L Property Solutions Ltd | Administrative & support | 2026 |
| J.P.R. (1994) Limited | Wholesale & retail | 1962 |
| J.R.Contract Cleaning | | 1989 |
| J.West Vehicle & Parts Sales Ltd | Wholesale & retail | 2025 |
| JA Property Agents Ltd | Real estate | 2024 |
| Jack Bennett Trading Limited | Construction | 2021 |
| Jackson and Young Limited | Arts & recreation | 2016 |
| Jackson Film Limited | Information & communication | 2018 |
| Jadeas Ltd | Health & social care | 2023 |
| JAM Jordan Music Management Ltd | Arts & recreation | 2025 |
| James and Tiggy Ltd | Arts & recreation | 2021 |
| James Brown Tree Contracting South West Limited | Administrative & support | 2025 |
| James Coomber Ltd | Education | 2023 |
| James Electrics Contracting Limited | Manufacturing | 2000 |
| James Electrics Holdings Limited | Manufacturing | 2023 |
| James Sherlock Limited | Wholesale & retail | 2004 |
| Jamie Arnold Plumbing and Heating Ltd | Construction | 2019 |
| Jamjar Travel Ltd | Administrative & support | 2024 |
| Jampot Creative Limited | Administrative & support | 2023 |
| JB Theatre Productions Ltd | Arts & recreation | 2023 |
| JCP Assets & Holdings Ltd | Financial services | 2024 |
| JD Accountants (Barnstaple) Ltd | Professional & scientific | 2015 |
| JD Accountants (South West) Ltd | Professional & scientific | 2020 |
| JD Virtual Ltd | Wholesale & retail | 2022 |