| GRG London Ltd | Manufacturing | 2022 |
| Griffin Moulds JJP Limited | Manufacturing | 2015 |
| Grisjoratan Limited | Real estate | 2023 |
| Grob-Logistics UK Ltd | Transport & logistics | 2026 |
| Grosfillex (U.K.) Limited | Wholesale & retail | 1972 |
| Ground UP (North) Limited | Hospitality | 2016 |
| Grove Property Group Ltd | Real estate | 2021 |
| Growth Wave Ltd | Hospitality | 2023 |
| Growthev Ltd | Professional & scientific | 2025 |
| Grub and Groove Limited | Hospitality | 2025 |
| Gsan Ltd | Information & communication | 2023 |
| GSJ Plumbing & Heating Ltd | Construction | 2024 |
| GSJ Properties Ltd | Real estate | 2021 |
| GSS Motors Ltd | Financial services | 2024 |
| Gstc Limited | Professional & scientific | 2010 |
| GTV Europe Limited | Transport & logistics | 2025 |
| Guduru Global Limited | Administrative & support | 2016 |
| Guduru Global Property Services Limited | Real estate | 2020 |
| Guide Star Solutions Limited | Information & communication | 2013 |
| Guilherme Silva Santos Ltd | Construction | 2026 |
| Gumley House Convent School FCJ | Education | 2012 |
| Gung HO Music Group Limited | Arts & recreation | 2006 |
| Gupta Enterprises Limited | Wholesale & retail | 2025 |
| Gurbaaz Logistics Ltd | Transport & logistics | 2026 |
| Gurfateh Limited | Real estate | 2020 |
| Gurpurabh Investments Limited | Real estate | 2019 |
| Gwynne Residential Limited | Real estate | 2019 |
| Gym EXC. Ltd | Wholesale & retail | 2021 |
| H&H Shah Ltd | Education | 2025 |
| H&L Software Solutions Ltd | Information & communication | 2018 |
| H&M Property Services Ltd | Real estate | 2024 |
| H&R Group Private Limited | Wholesale & retail | 2025 |
| H.G. Orme & Co. Limited | Real estate | 1949 |
| Haandklaederadiator.Dk Limited | Wholesale & retail | 2009 |
| Habiib Limited | Health & social care | 2020 |
| Haemoglobinopathy Consultancy Services Ltd. | Professional & scientific | 2019 |
| HAI Phong TEC Limited | Wholesale & retail | 2025 |
| Hamilton Associates (GB) Limited | Information & communication | 2008 |
| Hampton Studio Limited | Real estate | 2020 |
| Hands & Soul Limited | Hospitality | 2020 |
| Handyman Repairs Ltd. | Wholesale & retail | 2018 |
| Hanks Group Limited | Real estate | 2019 |
| Hansa Finance International LLP | | 2014 |
| Hanspal LGV Training Ltd | Education | 2013 |
| Hansra Haulage Ltd | Transport & logistics | 2016 |
| Happyroofs Limited | Construction | 2017 |
| Harb's Properties Limited | Real estate | 2021 |
| Harewood Estates Management Limited | Real estate | 2016 |
| Harewood Forest 1 Limited | Financial services | 2025 |
| Harewood Forest 2 Limited | Financial services | 2025 |
| Harf Limited | Real estate | 2010 |
| Harleycrest Properties Limited | Real estate | 1997 |
| Harman Digital Ltd | Information & communication | 2020 |
| Harman Luxury Homes Ltd | Real estate | 2020 |
| Harris Rigging Ltd | Information & communication | 2013 |
| Harrow Fruit & VEG Ltd | Wholesale & retail | 2022 |
| Harshrinath Enterprises Ltd | Real estate | 2005 |
| Harvest Divine Limited | Administrative & support | 2015 |
| Hasi Construction Ltd | Construction | 2011 |
| Hassan Ukhra Estates Limited | Real estate | 2024 |
| HAT Media Consultancy Limited | Information & communication | 2012 |
| Haus - Izabella Ltd | Hospitality | 2014 |
| Haus Club Ltd | Real estate | 2026 |
| Hava Group Ltd | Wholesale & retail | 2025 |
| Havenlock Properties Ltd | Real estate | 2025 |
| Havenrise Properties Ltd | Real estate | 2024 |
| Hayat Private Legal Services Ltd | Professional & scientific | 2024 |
| Hayworth Property Consultancy Ltd | Professional & scientific | 2023 |
| Hazell Productions Ltd | Information & communication | 2025 |
| Hbvc Ltd | Wholesale & retail | 2026 |
| HDG Consult Limited | Professional & scientific | 2024 |
| Hdrèy Group Ltd | Wholesale & retail | 2026 |
| Headlane Ltd | Information & communication | 2011 |
| Healey & Mcgill Limited | Construction | 2018 |
| Healing Nest Studio Ltd | Wholesale & retail | 2025 |
| Health Supplements Ltd | Manufacturing | 2014 |
| Healthcare Dimensions Limited | Health & social care | 2008 |
| Heart of Fulham Ltd | Real estate | 2022 |
| Hearthub Associates Limited | Health & social care | 2025 |
| Heathrow Genius Parking Limited | Other services | 2023 |
| Heating & Oven Technology Limited | Manufacturing | 2013 |
| Heavenly Green Salons Ltd | Health & social care | 2016 |
| Heavystones Ltd | Wholesale & retail | 2026 |
| Heeman Snooker Ltd | Arts & recreation | 2024 |
| HEI Hing Cafe & Noodle Bar Limited | Hospitality | 2013 |
| Heights Cargo Ltd | Transport & logistics | 2021 |
| Heldan Pubs Ltd | Hospitality | 2019 |
| Hemick Limited | Real estate | 2006 |
| Hemy Limited | Financial services | 2022 |
| Heng Heng Richmond Ltd | Hospitality | 2023 |
| Henleys Estates Ltd | Real estate | 2006 |
| Henleys Maintenance Ltd | Construction | 2017 |
| Henleys Management Group Limited | Real estate | 2023 |
| Henry & Co. Properties Ltd | Real estate | 2025 |
| Herd Construction (Herts) Limited | Real estate | 1971 |
| Heritage Home & Garden Limited | Water & waste | 2026 |
| Heston Auto Mechanics Ltd | Wholesale & retail | 2017 |
| Hexicon Limited | Education | 2019 |
| Heybs Autos Ltd | Administrative & support | 2025 |
| Heyrich Property Maintenance Ltd | Construction | 2026 |