| Harbil Limited | Hospitality | 2002 |
| Harbour Construction Dorset Limited | Construction | 2003 |
| Harbour Lights Guest House Limited | Hospitality | 2023 |
| Harbour Outreach Ltd | Administrative & support | 2025 |
| Harbour Point (Weymouth) NO. 1 Management Limited | Households | 1997 |
| Hard Iced Tea Company Ltd | Manufacturing | 2025 |
| Hardy Bar (Weymouth Golf Club) Limited | Hospitality | 2018 |
| Hardy Landscape Build and Design Ltd | Administrative & support | 2012 |
| Hardy View Catering Limited | Hospitality | 2018 |
| Harris (Weymouth) Limited | Hospitality | 2003 |
| Harrison Court (Weymouth) Management Company Limited | Households | 2000 |
| Harrogate Precision Engineering Limited | Professional & scientific | 2011 |
| Hart Marketing International Limited | Professional & scientific | 1997 |
| Harukai Ltd | Professional & scientific | 2024 |
| Harveys Bar & Grill Limited | Hospitality | 2020 |
| Hastings Electrical Services Ltd | Manufacturing | 2024 |
| Hasuna Limited | Hospitality | 2025 |
| Hatch on the Harbour Limited | Hospitality | 2020 |
| Hatters Places Limited | Real estate | 2022 |
| Hawthorne Property Limited | Real estate | 2014 |
| Hayley Stanton Bookkeeping Services Ltd | Professional & scientific | 2022 |
| Hayter Carpets Limited | Wholesale & retail | 2010 |
| Hazel Lily Ltd | Real estate | 2022 |
| HB Skin Care Limited | Other services | 2019 |
| HC Medical Aesthetic Clinic Limited | Health & social care | 2007 |
| HDH Developments Ltd | Construction | 2014 |
| Healingways Ltd | Manufacturing | 2019 |
| Heartfelt Homes Management Ltd | Real estate | 2022 |
| Heartwise Limited | Health & social care | 2025 |
| Heating and Plumbing Technology Ltd | Construction | 2014 |
| Helen Developments Limited | Construction | 2012 |
| Helitots Day Nursery Limited | Education | 2012 |
| Helix Interiors Ltd | Professional & scientific | 2020 |
| Helmurdine Homes Ltd | Real estate | 2021 |
| Hendford Grove Limited | Real estate | 2017 |
| Hennessey Roofing & Cladding Limited | Construction | 2016 |
| Henry Construction Management Limited | Professional & scientific | 2020 |
| Henry Thompson Ltd | Administrative & support | 2011 |
| Herculeaf Ltd | Manufacturing | 2023 |
| Heritage BSS Limited | Financial services | 2002 |
| Heritage Heating & Plumbing Ltd | Other services | 2017 |
| Heritage Seeds Limited | Wholesale & retail | 2011 |
| Heritage Will Writing (Dorset) Limited | Professional & scientific | 2014 |
| Hetherly Walk Management Company Limited | Households | 2022 |
| Hewletts Pet and Country Store Ltd | Wholesale & retail | 2025 |
| HG Homes & Developments Limited | Real estate | 2023 |
| Hibernia Management Company Limited | Households | 2018 |
| Hidden JEM Ltd | Hospitality | 2024 |
| Hidden Potential Limited | Extraterritorial | 2008 |
| High Life Leisure Limited | Wholesale & retail | 2012 |
| High Life Projects Ltd | Construction | 2025 |
| Highbrow Academy Limited | Education | 2020 |
| Highdean Limited | Construction | 1999 |
| Higher Moor Farm Ltd | Hospitality | 2018 |
| Higher Southwell Farm Limited | Agriculture & fishing | 2021 |
| Highlight Cleaning Solutions Ltd | Administrative & support | 2025 |
| Highlight Electrical Ltd | Construction | 2012 |
| Highlight Electrical Services Ltd | Construction | 2024 |
| Highview Properties 1688 Limited | Real estate | 2016 |
| Hillaudit Ltd | Professional & scientific | 2024 |
| Hine & Parsons Drapery Limited | Financial services | 1998 |
| Hines Property Limited | Real estate | 2020 |
| Hinterland Property Ltd | Construction | 2022 |
| Hitchens (Devon) Limited | Financial services | 1952 |
| Hmsj Trading Limited | Professional & scientific | 2024 |
| Holloway Properties 2016 Limited | Real estate | 2016 |
| Holt Financial Services Limited | Financial services | 2013 |
| Home Shop Catalogue Ltd | Wholesale & retail | 2011 |
| Homespex Limited | Wholesale & retail | 2025 |
| Homestay and Venture Breaks Limited | Administrative & support | 2013 |
| Honeybeartrader Ltd | Wholesale & retail | 2005 |
| Honeysuckle Walk Psychological Services Ltd | Health & social care | 2019 |
| Hood Engineering (UK) Limited | Manufacturing | 2013 |
| Hooked on Boots Ltd | Education | 2026 |
| Horizon Innovation Limited | Professional & scientific | 2012 |
| Horizon Invest Ltd | Financial services | 2015 |
| Horizons Holdings Limited | Real estate | 2026 |
| Horseshoe Management (Martinstown) Limited | Households | 2024 |
| Hostra Ltd | Information & communication | 2024 |
| Hot Noodle Productions Ltd | Arts & recreation | 2021 |
| Hotel Chatsworth Limited | Hospitality | 2019 |
| Hotel Norfolk Weymouth Limited | Hospitality | 2001 |
| House of Gumption Ltd | Other services | 2020 |
| House of Palm Limited | Professional & scientific | 2024 |
| House of Rustic Ltd | Wholesale & retail | 2017 |
| House of Sage Limited | Wholesale & retail | 2023 |
| Houseworks Dorset C.I.C. | Wholesale & retail | 2019 |
| Howes Car Body Repairs Ltd | Wholesale & retail | 2013 |
| HR Solutions (South) Ltd | Professional & scientific | 2024 |
| Hull Gregson Hull Dorchester Ltd | Real estate | 2025 |
| Hull Gregson Hull Lettings Ltd | Real estate | 2001 |
| Hull Gregson Hull Ltd | Real estate | 2016 |
| Hull Scaffolding Limited | Construction | 2023 |
| Hungerhill Garage Limited | Wholesale & retail | 2011 |
| Hunter (Dorset) Ltd | Wholesale & retail | 2023 |
| Huzaifa Solutions Ltd | Manufacturing | 2016 |
| Hybris Business Park Management Company Limited | Professional & scientific | 2008 |
| Hyde's Hedges & General Maintenance Ltd | Administrative & support | 2022 |
| Hydrofast Limited | Wholesale & retail | 2021 |
| Höst Dorset Limited | Hospitality | 2022 |