| H Shawyer & Sons Limited | Manufacturing | 1944 |
| H.F.Heard Limited | Transport & logistics | 1950 |
| Halsbeer Farm Holidays Ltd | Hospitality | 2016 |
| Happy Paws Doggy Daycare Ltd | Other services | 2023 |
| Harper and Barrett Ltd | Professional & scientific | 2005 |
| Harris Engineering Southwest Ltd | Manufacturing | 2018 |
| Hart & Noble Ltd | Wholesale & retail | 2025 |
| Hartnack & Company Limited | Manufacturing | 2016 |
| Harvest and Hearth Ltd | Hospitality | 2025 |
| Hatfold Limited | Education | 2025 |
| Hatull Ltd | Professional & scientific | 2026 |
| Hawkcrest Estates (Southern) Limited | Real estate | 2001 |
| Haywain Legal Limited | Professional & scientific | 2021 |
| HD Fitness Cullompton Ltd | Arts & recreation | 2024 |
| Health & Beauty House Ltd | Other services | 2018 |
| Health Systems Development (UK) Limited | Professional & scientific | 2005 |
| Hell NO Brew Co. Limited | Manufacturing | 2020 |
| Helm Projects Limited | Professional & scientific | 2013 |
| Help ME to the High Street Ltd | Real estate | 2021 |
| Hemyock Convenience Store Limited | Wholesale & retail | 2015 |
| Hemyock Engineering Limited | Professional & scientific | 2012 |
| Henley Print 3D Ltd | Manufacturing | 2018 |
| Henry&Tommy Limited | Real estate | 2025 |
| Hero 2 Transport Ltd | Transport & logistics | 2025 |
| Heyridge Meadow RTM Company Limited | Households | 2017 |
| HG Pro Ltd | Construction | 2022 |
| Hiflo Precision Ltd | Wholesale & retail | 2015 |
| High Tower Rope Access Ltd | Construction | 2026 |
| Higher Kings Mill Limited | Manufacturing | 2011 |
| Highfield Preserves Limited | Manufacturing | 1998 |
| Hills Farriery Ltd | Other services | 2014 |
| Hiloke Limited | Wholesale & retail | 2025 |
| Hive Weddings Ltd | Wholesale & retail | 2021 |
| HNC Engineering Ltd | Extraterritorial | 2022 |
| Holcombe Consultancy Services Limited | Professional & scientific | 2010 |
| Hollisgreen Investments Limited | Construction | 2026 |
| Holmes EAR Care Ltd | Wholesale & retail | 2025 |
| Holmes EYE Care Ltd | Wholesale & retail | 2018 |
| Holmes Eyes and Ears Ltd | Health & social care | 2023 |
| Home Restoration Solutions Limited | Construction | 2014 |
| Homefinders (Devon & Somerset) Limited | Real estate | 2003 |
| Hongs Taste Limited | Hospitality | 2025 |
| Hope-Mason Limited | Real estate | 2024 |
| Hotter Logs Limited | Wholesale & retail | 2015 |
| Hugh Gibson Engineering Services Limited | Manufacturing | 2003 |
| Hughes Consulting Engineering Ltd | Construction | 2010 |
| Hunterskill Limited | Wholesale & retail | 1987 |
| Hydromatch Ltd | Energy | 2005 |
| Hyland Car Sales Ltd | Wholesale & retail | 2019 |
| Iabl Limited | Hospitality | 2021 |
| IAN Allen Technical Services Ltd | Professional & scientific | 2020 |
| IAN Parkhouse Plumbing and Heating Limited | Construction | 2018 |
| ID UK Carpentry Limited | Construction | 2025 |
| Infinity Holdings & Investments Ltd | Financial services | 2020 |
| Infinity Music Publishing Ltd | Information & communication | 2024 |
| Infinity Team Ltd | Administrative & support | 2021 |
| Ingleby Dental Practice Limited | Health & social care | 2012 |
| Innate Building Services Ltd | Construction | 2026 |
| Innate Construction Limited | Construction | 2017 |
| Inrhenga Ltd | Financial services | 2024 |
| Insegni Limited | Education | 2008 |
| Inspired Company Services Limited | Financial services | 2003 |
| Integrity (Europe) Limited | Wholesale & retail | 1999 |
| Integy Ltd | Information & communication | 2019 |
| Investigative Training Solutions Ltd | Administrative & support | 2024 |
| Ipoh Investments Limited | Real estate | 2023 |
| Isca Surveying Services Ltd | Construction | 2010 |
| J C Express Couriers Limited | Transport & logistics | 2022 |
| J Earle Consulting Limited | Information & communication | 2026 |
| J R Wigmore Ltd | Transport & logistics | 2016 |
| J S Broom Limited | Construction | 2019 |
| J S Engineering (S W) Limited | Construction | 2006 |
| J Wooff Joinery Ltd | Manufacturing | 2013 |
| J&M Plant & Machinery Ltd | Wholesale & retail | 2022 |
| J&M Property & Developments Ltd | Real estate | 2025 |
| J. Collier Construction Limited | Construction | 2020 |
| J.C Plant Engineering Ltd | Professional & scientific | 2025 |
| Jack Ross Properties Ltd | Real estate | 2023 |
| Jackson Decorators Holdings Ltd | Financial services | 2022 |
| Jagger Cane Construction Ltd | Construction | 2025 |
| JAK Hire Ltd | Other services | 2016 |
| JAM on Cullompton CIC | Arts & recreation | 2026 |
| James Moore Electrical Limited | Energy | 2011 |
| James Moore Transport Limited | Extraterritorial | 2018 |
| Jane Julier Ltd | Manufacturing | 2021 |
| Jay's Property Limited | Real estate | 2016 |
| Jayne’S Little Steps Ltd | Health & social care | 2018 |
| Jc.Propert. Ltd | Real estate | 2024 |
| Jc.Propertlet. Ltd | Real estate | 2026 |
| Jewells Limited | Manufacturing | 2012 |
| JFS Plant Hire Ltd | Administrative & support | 2022 |
| Jglcockings Ltd | Health & social care | 2024 |
| JIM Davis Automation Ltd | Manufacturing | 2015 |
| JJJ Property 2017 Ltd | Real estate | 2017 |
| JK19 Ltd | Wholesale & retail | 2019 |
| Jkjsk Ltd | Water & waste | 2026 |
| JMG Inns LLP | | 2016 |
| JMS Electrics Ltd | Construction | 2015 |
| John Dent Limited | Information & communication | 1997 |
| Jolly Swim School Ltd | Education | 2025 |