| Home Gear AV Ltd | Wholesale & retail | 2025 |
| Home Projects Dorset Ltd | Construction | 2022 |
| Homeshire Property Limited | Construction | 2009 |
| Hometree Homeimprovements Ltd | Construction | 2026 |
| Honeymoon Chinese Ltd | Hospitality | 2026 |
| Honk Labs Limited | Information & communication | 2026 |
| Hope in the Community Limited | Administrative & support | 2003 |
| Horizon Aviation Ltd | Transport & logistics | 2012 |
| Horizon Land Developments Ltd | Construction | 2017 |
| Horton Oak Builders Ltd | Construction | 2024 |
| Hot and Cold Bournemouth Limited | Manufacturing | 2009 |
| Hot Merch Limited | Financial services | 2023 |
| Hotline Promotions Limited | Professional & scientific | 1994 |
| Hotpro Limited | Real estate | 2022 |
| House at the Sea Ltd | Construction | 2021 |
| House Homes Ltd | Real estate | 2021 |
| House of Stunts Limited | Professional & scientific | 2026 |
| Houseproud Investments Limited | Real estate | 2022 |
| Howard Morris Limited | Professional & scientific | 2007 |
| Howells Plumbings Ltd | Construction | 2025 |
| Howie & Tickner Limited | Wholesale & retail | 2000 |
| HPM South Limited | Households | 2012 |
| HQ Support Ltd | Administrative & support | 2019 |
| HR Diagnostics Limited | Information & communication | 2023 |
| Hrbathe Ltd | Administrative & support | 2024 |
| HRH Construction Ltd | Construction | 2020 |
| HS Geometrics Ltd | Information & communication | 2003 |
| HUG Homecare Limited | Administrative & support | 2025 |
| Human Capacity Limited | Health & social care | 2025 |
| Humdinger Promotions Ltd | Wholesale & retail | 2011 |
| Hungry Henry Ltd | Wholesale & retail | 2023 |
| Hunters (Dorset) Limited | Hospitality | 2026 |
| Hurn Airport Auto Centre Limited | Wholesale & retail | 1994 |
| Hurn Bridge Sports Club Limited | Arts & recreation | 2003 |
| Hurn Construction Ltd | Construction | 2024 |
| Hurn Court Management Company Limited | Households | 1995 |
| Hurn Recycling Devon Limited | Water & waste | 2024 |
| Hurn Recycling Holdings Limited | Professional & scientific | 2024 |
| Hurn Recycling Limited | Water & waste | 2011 |
| Hurn Waste Management Services Limited | Water & waste | 2021 |
| Hutley Medical Services Ltd | Health & social care | 2023 |
| HWB Design Limited | Professional & scientific | 2005 |
| Hybrid Marine Power Ltd | Information & communication | 2008 |
| I Fogg HV Safety Limited | Administrative & support | 2014 |
| I-Koncepts Group Limited | Financial services | 2021 |
| I-Koncepts Limited | Wholesale & retail | 2002 |
| ICF Homes Ltd | Construction | 2017 |
| Icolorify Ltd | Wholesale & retail | 2022 |
| Icons B-Locked Limited | Information & communication | 2022 |
| Icons Shop Limited | Administrative & support | 2009 |
| ICS Lettings Ltd | Real estate | 2022 |
| Ideal Coldroom Services Limited | Construction | 2015 |
| Ideal Design Interiors Ltd | Professional & scientific | 2011 |
| Idealurban Residents Management Limited | Households | 1988 |
| IDH Projects Ltd | Wholesale & retail | 2016 |
| IDH Property Ltd | Real estate | 2015 |
| IDM Electrical (South) Ltd | Construction | 2024 |
| IDM Tranport Ltd | Transport & logistics | 2020 |
| Iery Properties Ltd | Real estate | 2022 |
| Ifsogo Etail Ltd | Wholesale & retail | 2004 |
| IGC Technology Limited | Information & communication | 2014 |
| Ikhishi Bakes Limited | Hospitality | 2019 |
| Ikon Deerstalking Ltd | Agriculture & fishing | 2020 |
| Iluvbargainsuk Ltd | Wholesale & retail | 2013 |
| Imageglossy Limited | Manufacturing | 1994 |
| Impactive Solutions Limited | Information & communication | 2015 |
| Imperial Park Bournemouth Limited | Real estate | 2017 |
| IN Financials Limited | Professional & scientific | 2019 |
| IN Flow Chiropractic Ltd | Health & social care | 2022 |
| IN the Frame (Highcliffe) Limited | Wholesale & retail | 2010 |
| Indigodog Publishing Limited | Information & communication | 2003 |
| Inditec Ltd | Administrative & support | 2017 |
| Industree Carpentry Ltd | Construction | 2025 |
| Industree Limited | Construction | 2015 |
| INDYSK8 Limited | Wholesale & retail | 2021 |
| INFINITE8LIFE LLP | | 2022 |
| Infosec Assessments Ltd | Education | 2024 |
| Innate Equine Ltd | Agriculture & fishing | 2015 |
| Innovex Equip Healthcare Ltd | Wholesale & retail | 2024 |
| Insight Aero Ltd | Transport & logistics | 2023 |
| Insight Aviation Group Ltd | Transport & logistics | 2015 |
| Insight Training Solutions Limited | Education | 2002 |
| Instant Refrigeration Services Limited | Construction | 2013 |
| Intelligence Media Ltd | Information & communication | 2023 |
| Interex Real Estates Ltd | Real estate | 2025 |
| International Craft & Hobby Fair Limited | Other services | 1976 |
| Internet MAN Limited | Professional & scientific | 2022 |
| Interworks Emea Limited | Information & communication | 2023 |
| Interworks Europe Group Limited | Information & communication | 2014 |
| Interworks Europe Limited | Information & communication | 2013 |
| Intrepid Skateboarding CIC | Education | 2024 |
| Intuition Provision Ltd | Wholesale & retail | 2024 |
| Inveravon Residents Association Limited | Households | 1974 |
| Invictus Logistics Ltd | Administrative & support | 2019 |
| Invisible Wounds Limited | Information & communication | 2025 |
| ION Iulisca Ltd | Transport & logistics | 2025 |
| Isabels Treasures Ltd | Wholesale & retail | 2020 |
| Isko Kebab Ltd | Hospitality | 2025 |
| Isko Property Management Ltd | Real estate | 2023 |
| Isko UK Ltd | Construction | 2021 |