| GSR Services Limited | Construction | 2019 |
| Gstefanov Ltd | Construction | 2016 |
| Gtgm Service Ltd | Information & communication | 2021 |
| Guardian Shield Ltd | Administrative & support | 2024 |
| Gubmaster UK Ltd | Professional & scientific | 2026 |
| Guidance Events Ltd | Information & communication | 2024 |
| Gulmez Plumbing and Welding Services Ltd | Manufacturing | 2020 |
| Gunduzler Works Ltd | Information & communication | 2021 |
| Gunes Willesden Limited | Hospitality | 2025 |
| Gunsport Distribution Limited | Arts & recreation | 2007 |
| Gutinul Limited | Construction | 2016 |
| GV Accounting Services Ltd | Other services | 2019 |
| GV Lettings Ltd | Construction | 2022 |
| GW Consulting Solutions Limited | Professional & scientific | 2023 |
| Gwamzy Consulting Ltd | Professional & scientific | 2024 |
| GWH Coaching Consultancy Ltd | Other services | 2023 |
| Gyobventures Limited | Extraterritorial | 2024 |
| H & G Property Investments Limited | Real estate | 2018 |
| H K Sparks Ltd | Wholesale & retail | 2018 |
| H L World Maintenance Ltd | Administrative & support | 2025 |
| H R Builders Limited | Construction | 2023 |
| H Surveying Limited | Professional & scientific | 2014 |
| H Tree Limited | Wholesale & retail | 2016 |
| H&E Properties Ltd | Real estate | 2021 |
| H&J Jalloh Group Ltd | Construction | 2020 |
| H&K Style Limited | Other services | 2026 |
| H&L Property Investment Ltd | Real estate | 2023 |
| H&R Accounting Services Ltd | Professional & scientific | 2020 |
| H&U Elite Aura Ltd | Real estate | 2025 |
| H.M. Electric Motor REP. & Sales Co Ltd | Other services | 2011 |
| HA Building Solutions Ltd | Construction | 2026 |
| Hakim Sembatya Ltd | Health & social care | 2026 |
| Hakko's Barber Limited | Other services | 2020 |
| Hallie Care Limited | Public administration | 2023 |
| Halo Media Enterprises Limited | Professional & scientific | 2020 |
| Halo Media Holdings Limited | Financial services | 2022 |
| Hamarh Limited | Wholesale & retail | 2024 |
| Hammykn Ltd | Public administration | 2022 |
| Hamo & Partners Ltd | Wholesale & retail | 2021 |
| HAN Tailoring Ltd | Other services | 2020 |
| Hancocks Cycles Ltd | Wholesale & retail | 2022 |
| Hancocks of Cheshunt Limited | Wholesale & retail | 1992 |
| Handasset Limited | Administrative & support | 2008 |
| Handersons Shop Ltd | Wholesale & retail | 2024 |
| Handmade by JEM Limited | Manufacturing | 2015 |
| Handy Design Ltd | Construction | 2024 |
| Hannah Couzens Photography Limited | Professional & scientific | 2011 |
| Hanover Residential (TF) Limited | Real estate | 1996 |
| Hans Property Group Ltd | Households | 2025 |
| Happy Home Development Limited | Households | 2025 |
| Happy Home Solutions Ltd | Education | 2022 |
| Happy Returns Limited | Wholesale & retail | 2004 |
| Harbourfront Associates Ltd | Professional & scientific | 2006 |
| Hard Building Ltd | Construction | 2017 |
| Hari Heer Trading Ltd | Wholesale & retail | 2025 |
| Hari OM Property Services Ltd | Real estate | 2021 |
| Haridaan Limited | Information & communication | 2018 |
| Harley Engineering (UK) Limited | Manufacturing | 2010 |
| Harmony Garden CIC | Agriculture & fishing | 2025 |
| Haroon & Co Limited | Information & communication | 2025 |
| Harrow and Wembley Society of Model Engineers | Arts & recreation | 2014 |
| Hartland Drive Management Company Limited | Real estate | 2021 |
| Hartsfield Properties Limited | Real estate | 2025 |
| Harvey Construction (SG12) Ltd | Construction | 2019 |
| Harvey Construction Enfield Ltd | Construction | 2019 |
| HASH7 Limited | Professional & scientific | 2023 |
| Hass Investments Ltd | Real estate | 2010 |
| Hatian Limited | Real estate | 2020 |
| Haughey Holdings Limited | Financial services | 2024 |
| Haus of Branches Limited | Hospitality | 2026 |
| Haven Rise Care Ltd | Health & social care | 2025 |
| Hawkes International Ltd | Extraterritorial | 2023 |
| HAY Security Solutions Ltd | Administrative & support | 2022 |
| Haynes Electrical Ltd | Construction | 2016 |
| Hayyas (Waltham Cross) Limited | Wholesale & retail | 2013 |
| Hazar Property Limited | Real estate | 2025 |
| Hazelfield Ltd | Construction | 2025 |
| HC Yummy Limited | Wholesale & retail | 2024 |
| Hcan Property Ltd | Real estate | 2025 |
| HCC Wheelchair Transport Limited | Transport & logistics | 2026 |
| HCK Bros Ltd | Hospitality | 2023 |
| HCK Foods Ltd | Hospitality | 2025 |
| Hcpm Limited | Professional & scientific | 2016 |
| Hcwc Group Ltd | Construction | 2025 |
| HD Broadcasting System Technology Limited | Wholesale & retail | 2021 |
| Hdds Design & Build Ltd | Construction | 2026 |
| HE Planning Ltd | Professional & scientific | 2025 |
| Head & Head Ltd | Hospitality | 2020 |
| Healing Eden Ltd | Other services | 2024 |
| Health Chester Limited | Health & social care | 2022 |
| Health IS Wealth Corp Limited | Health & social care | 2020 |
| Heart Mind Talent Ltd | Administrative & support | 2023 |
| Heartley Homes Ltd | Real estate | 2020 |
| Hearts Kind Limited | Other services | 2020 |
| Heat Go Ltd | Construction | 2016 |
| Heathborne Limited | Real estate | 2016 |
| Heavenly Estates Limited | Real estate | 2021 |
| Hector Made IT Limited | Arts & recreation | 2021 |
| Heiland Limited | Construction | 1976 |
| Helios Bakery Patisserie Ltd | Manufacturing | 2026 |