| Griffin Court (Management) Limited | Households | 1981 |
| Grit Consult Limited | Professional & scientific | 2005 |
| Gritty Technology Ltd | Information & communication | 2022 |
| Groome Property Investments Ltd | Real estate | 2021 |
| Groomlake Design Ltd | Professional & scientific | 2021 |
| Ground Contamination Limited | Extraterritorial | 2021 |
| Ground to Air Heat Solutions Limited | Construction | 2021 |
| Grovemere Services Limited | Construction | 1995 |
| Grovepoint Project Delivery Limited | Information & communication | 2026 |
| Growth Psychology Ltd | Education | 2018 |
| GRR Consulting Ltd | Professional & scientific | 2022 |
| GS Consultants Limited | Information & communication | 2017 |
| GS Electronics Ltd | Manufacturing | 2019 |
| Gsby Consulting Limited | Professional & scientific | 2025 |
| Gsby Investments Limited | Financial services | 2025 |
| Gsby Leisure Limited | Administrative & support | 2025 |
| Gsby Lettings Limited | Real estate | 2025 |
| Gsby Limited | Financial services | 2025 |
| GSD 21 Ltd | Information & communication | 2018 |
| Gsmh Limited | Financial services | 2026 |
| Gsquare Software Ltd. | Information & communication | 2019 |
| GSS Contracting Ltd | Construction | 2022 |
| GT Squared Consultancy Limited | Administrative & support | 2021 |
| GTO Consultancy Limited | Professional & scientific | 2015 |
| Gtvr Ltd | Health & social care | 2020 |
| Guaggenti Holdings Ltd | Financial services | 2025 |
| Guaggenti Limited | Hospitality | 1999 |
| Guardall Security Systems Limited | Administrative & support | 2004 |
| Guidestone Limited | Information & communication | 2025 |
| Guiseley Consulting Limited | Professional & scientific | 2014 |
| Gulf Commerce Limited | Administrative & support | 2024 |
| Gullwing Capital Advisers Ltd | Financial services | 2014 |
| Guma Design Limited | Professional & scientific | 2019 |
| Gunston Consulting Limited | Professional & scientific | 2022 |
| Gussage Accounting Services Limited | Professional & scientific | 2013 |
| Gussage ST Mich ALE Ltd | Manufacturing | 2025 |
| Gussay Solutions Ltd | Information & communication | 2014 |
| GUY Bevis Property Limited | Real estate | 2024 |
| GW Langlands Services Limited | Agriculture & fishing | 2015 |
| Gwenray Capital Limited | Financial services | 2012 |
| H & H Veterinary Services Limited | Professional & scientific | 2022 |
| H B H Limited | Professional & scientific | 1995 |
| H E a Services Ltd | Agriculture & fishing | 2007 |
| H E Electronics Limited | Manufacturing | 1997 |
| H Thomas Consulting Ltd | Professional & scientific | 2024 |
| H-Automation Ltd | Information & communication | 2019 |
| H2ECO Partnerships Limited | Energy | 2011 |
| Hagen Consulting Limited | Information & communication | 2017 |
| Hague Property Developments Ltd | Real estate | 2025 |
| Haleytech Limited | Information & communication | 2022 |
| Hallmoore Developments Ltd | Construction | 2024 |
| Halo Inspections Limited | Real estate | 2021 |
| Halyard (M & I) Ltd | Manufacturing | 1979 |
| Halyard Fabrications Limited | Manufacturing | 1975 |
| Hamilton Auto Tech Limited | Wholesale & retail | 2012 |
| Hamilton Digital Media Limited | Information & communication | 2024 |
| Hamilton Wealth Management Limited | Financial services | 2017 |
| Hamish and Milo Limited | Education | 2021 |
| Hammock Bidding Limited | Professional & scientific | 2020 |
| Hammond & Co Accountants Limited | Professional & scientific | 2015 |
| Hammond Business Consulting Ltd | Information & communication | 2025 |
| Hammond Physio Ltd | Health & social care | 2015 |
| Hampreston Properties Limited | Administrative & support | 2016 |
| Hamptini Tech Limited | Information & communication | 2023 |
| Hamworthy Consultancy Ltd | Construction | 2024 |
| Hamworthy Ltd | Professional & scientific | 2025 |
| Hamzah Consulting Limited | Information & communication | 2021 |
| Hand to Earth Ltd | Administrative & support | 2025 |
| Hanfield RTM Company Ltd | Households | 2025 |
| Hann Defence Services Ltd | Information & communication | 2022 |
| Hannet Consultancy Services Ltd | Information & communication | 2018 |
| Hants & Dorset Properties Limited | Real estate | 1999 |
| Hanwell Tree Care Ltd | Agriculture & fishing | 2024 |
| Hanwest Consulting Limited | Professional & scientific | 2024 |
| Happy RAT Ventures Ltd | Information & communication | 2018 |
| HAR Wimborne Limited | Other services | 2025 |
| Harbour Security Ltd | Administrative & support | 2022 |
| Harbour View Carpentry Limited | Construction | 2021 |
| Harbourdiesels Ltd | Wholesale & retail | 2021 |
| Harbourside Inventories Limited | Administrative & support | 2025 |
| Harclis Ltd | Information & communication | 2026 |
| Hardye Housing Limited | Real estate | 2017 |
| Hardyman & Sons Ltd | Wholesale & retail | 2010 |
| Harland Developments Limited | Real estate | 1987 |
| Harland Investments Limited | Professional & scientific | 2002 |
| Harlees Fish & Chips Limited | Hospitality | 1997 |
| Harlo Services Ltd | Information & communication | 2025 |
| Harmattan Technologies Ltd | Manufacturing | 2018 |
| Harnhamhouse Limited | Professional & scientific | 2023 |
| Harris Screen Print Limited | Other services | 2011 |
| Harrison Creative Ltd | Professional & scientific | 2014 |
| Harrison Media Group Ltd | Other services | 2021 |
| Harrison Property Management Group Ltd | Real estate | 2022 |
| Harrison-Hiett Limited | Administrative & support | 2013 |
| Hartek Limited | Other services | 2010 |
| Hartforth Properties Limited | Real estate | 2024 |
| Hartley Cornforth Partners LLP | | 2024 |
| Hartley's Events Limited | Other services | 2007 |
| Hartswood Consulting Ltd | Professional & scientific | 2022 |
| Harvestudio Limited | Professional & scientific | 2024 |