| Godrevy Cafe Ltd | Hospitality | 2004 |
| Goldclad Storage Limited | Other services | 2022 |
| Golden Sands Property Management Ltd | Real estate | 2023 |
| Goldeneye Consultancy Limited | Professional & scientific | 2026 |
| Gonwin Developments Limited | Real estate | 2013 |
| Gosling Racing & Independent Design Ltd | Manufacturing | 2016 |
| Grace Amelia Estates Ltd | Construction | 2019 |
| Grace Rental Properties Limited | Real estate | 2023 |
| Grace Tutoring Limited | Education | 2023 |
| Graftlog Ltd | Information & communication | 2026 |
| Graham Tacagni Accountants Ltd | Professional & scientific | 2014 |
| Grangers Land & New Homes Limited | Construction | 2007 |
| Granta Garage Limited | Wholesale & retail | 2025 |
| Graylings Fire Limited | Construction | 2016 |
| Greatorex Enterprises Ltd | Administrative & support | 2018 |
| Greatorex Properties Limited | Real estate | 2024 |
| Green END Barns Consulting Ltd | Professional & scientific | 2023 |
| Green END Management Limited | Households | 2000 |
| Green Lawn & Property Improvements Ltd | Administrative & support | 2026 |
| Green Oak Financial Partners Ltd | Financial services | 2013 |
| Green Oak Partners Ltd | Administrative & support | 2010 |
| Greenley Cleaning Ltd | Administrative & support | 2026 |
| Greenwood Wilson Ltd | Professional & scientific | 2001 |
| Greyford Consulting Limited | Professional & scientific | 2014 |
| GRG Cambridge Limited | Administrative & support | 2017 |
| Groundwake Ltd | Construction | 2026 |
| Grove Villa Childcare Limited | Health & social care | 2018 |
| Grovelake Construction Limited | Construction | 1998 |
| Grwd Limited | Wholesale & retail | 2024 |
| Gsal Property and Rental Limited | Real estate | 2024 |
| GSR Flooring Limited | Construction | 2022 |
| Guava Design Limited | Information & communication | 2005 |
| Gullz R Loud Limited | Wholesale & retail | 2022 |
| Gungrange Limited | Construction | 1973 |
| GW Construction & Building Ltd | Wholesale & retail | 2024 |
| GW Consulting Services Limited | Professional & scientific | 2005 |
| Gwinear-Gwithian Sustainable Community Fund | Health & social care | 2012 |
| H Best Yeung Limited | Hospitality | 2024 |
| H Enow Healthcare Ltd | Health & social care | 2023 |
| H.Tempest Limited | Professional & scientific | 1942 |
| Hadley House Developments Limited | Real estate | 2024 |
| Hadley House Holdings Limited | Financial services | 2024 |
| Hallam & Jones Corporation Limited | Financial services | 2025 |
| Hallbarn PUB Ltd | Hospitality | 2025 |
| Halo Corp Ltd | Construction | 2018 |
| Hammer Head Promo Limited | Hospitality | 2024 |
| Hamon-Lawrence Building Services Ltd | Construction | 2014 |
| Hampden Consultancy Group Ltd | Information & communication | 2024 |
| Hamren Lake Properties Limited | Real estate | 2026 |
| Hanpack Limited | Administrative & support | 2023 |
| Hansall Limited | Administrative & support | 2007 |
| Hanseatic SKI Race Limited | Arts & recreation | 2019 |
| Harbour Housekeeping Ltd | Other services | 2023 |
| Harbour View ST Ives Ltd | Other services | 2018 |
| Harrier WM Ltd | Financial services | 2023 |
| Harriet Properties Limited | Real estate | 1986 |
| Harris and Cara LFB Limited | Professional & scientific | 2025 |
| Harris Residential Property Investments Limited | Real estate | 2012 |
| HAT Cafe Ltd | Hospitality | 2019 |
| Haupt Recruitment UK Ltd | Professional & scientific | 2008 |
| Haven Healthcare Cambridge Ltd | Health & social care | 2024 |
| Hawick Plant & Tool Hire Centre Limited | Extraterritorial | 2003 |
| Hawick Plant Ltd | Wholesale & retail | 2000 |
| Hazel Cozy Beds Limited | Hospitality | 2024 |
| Hazelwood Financial Limited | Professional & scientific | 2018 |
| HBH Laser Company Limited | Manufacturing | 2004 |
| Healthy AI Ltd | Information & communication | 2025 |
| Hector Hound Holdings UK Limited | Extraterritorial | 2008 |
| Height & Safety Consultants Limited | Professional & scientific | 2017 |
| Helios Magique Ltd | Wholesale & retail | 2013 |
| Hemingford Construction Services Ltd | Administrative & support | 2017 |
| Herbex Ltd | Wholesale & retail | 2021 |
| Hermitage Care Services Limited | Health & social care | 2018 |
| Hero Wellbeing Limited | Information & communication | 2017 |
| Herron's Tree Solutions Ltd | Agriculture & fishing | 2022 |
| Hethel Consulting Limited | Construction | 2019 |
| HGV Doctor Limited | Wholesale & retail | 2021 |
| Hibe Investments Ltd | Real estate | 2017 |
| Hibf Ltd | Wholesale & retail | 2023 |
| Highbury House (Falmouth) Limited | Households | 1969 |
| Highgrove (Horley) Limited | Construction | 2015 |
| Highland Diverse Haulage Ltd | Transport & logistics | 2025 |
| Highland Electric Limited | Construction | 2025 |
| Highland Group Holdings Ltd | Financial services | 2024 |
| Highland's of Royston Limited | Wholesale & retail | 2018 |
| Highline Blinds Ltd | Administrative & support | 2005 |
| Hilsa Limited | Wholesale & retail | 2020 |
| Himmat Transport Ltd | Transport & logistics | 2019 |
| Hjstocks Ltd | Wholesale & retail | 2026 |
| Holan Limited | Professional & scientific | 2022 |
| Holidayscornwall Ltd | Hospitality | 2022 |
| Hollowstar Ltd | Arts & recreation | 2018 |
| Holly Teal Sage Limited | Financial services | 2022 |
| Holmdale Properties (Loughton) Limited | Real estate | 2014 |
| Holmlodge Limited | Administrative & support | 2010 |
| Holmlodge Residential Limited | Real estate | 2015 |
| Home & Garden Company Cambridge Ltd | Construction | 2016 |
| Honestley Limited | Wholesale & retail | 2018 |
| Hook Properties Limited | Hospitality | 2016 |
| Hook Property Renovations Limited | Construction | 2016 |