| George Stefania Trans Limited | Transport & logistics | 2017 |
| Georgia Childminding Ltd | Health & social care | 2017 |
| Geotropical Ltd | Information & communication | 2023 |
| Gertyglobal Resources Ltd | Administrative & support | 2024 |
| Ghana Wholesome Foods Ltd | Wholesale & retail | 2025 |
| Giani Driving Solutions Ltd | Administrative & support | 2016 |
| Gianthealth UK Ltd | Other services | 2021 |
| Gibson Earthmoving Limited | Administrative & support | 2011 |
| Giedrius Transfers Ltd | Transport & logistics | 2020 |
| Gife Ltd | Information & communication | 2014 |
| Gill Resources Limited | Construction | 2024 |
| Gillz Entertainment UK Limited | Administrative & support | 2025 |
| Gladenchi Limited | Wholesale & retail | 2021 |
| Global Development and Property Management Limited | Construction | 2017 |
| Global Time Links Ltd | Construction | 2019 |
| Glorious Ventures Ltd | Health & social care | 2014 |
| Glynn's Gaming Ltd | Arts & recreation | 2014 |
| GM Storage & Transport Ltd | Transport & logistics | 2025 |
| GMB Trade Ltd | Construction | 2026 |
| GMD Studio Ltd | Professional & scientific | 2026 |
| GMP Dread Productions Ltd | Arts & recreation | 2025 |
| GNS GAS & Building Contractors Ltd | Construction | 2023 |
| Go Installing Ltd | Construction | 2021 |
| Gobjilav Ltd | Construction | 2017 |
| Goclean Ltd | Administrative & support | 2016 |
| Goglobal Limited | Information & communication | 2016 |
| Gold Key London Ltd | Construction | 2022 |
| Gold Wall Ltd | Hospitality | 2023 |
| Golden Praise Ltd | Wholesale & retail | 2022 |
| Goldskyhouse Ltd | Construction | 2021 |
| Gordon Group Ltd | Construction | 2018 |
| GP MOTORSPORT(25) Ltd | Wholesale & retail | 2025 |
| GQ Scaffolding Limited | Construction | 2024 |
| Grabngo App Ltd | Information & communication | 2024 |
| Grace PB Properties Ltd | Real estate | 2023 |
| Graceful Enterprise Limited | Real estate | 2022 |
| Graces International Ltd | Education | 2016 |
| Gracious Grace Intercession Ministry | Other services | 2022 |
| Gracious UK Ltd | Information & communication | 2018 |
| Graham Donald Petherick Ltd | Extraterritorial | 2022 |
| Grand Wedding Events Ltd | Hospitality | 2020 |
| Grant Tinting Ltd | Wholesale & retail | 2025 |
| Greg London Ltd | Construction | 2019 |
| Grivanov Ltd | Transport & logistics | 2019 |
| Gsboy Limited | Wholesale & retail | 2015 |
| GSI Networks Ltd | Construction | 2022 |
| Guardian Auto Group Ltd | Transport & logistics | 2025 |
| Gulf Onshore & Offshore Consultants UK Limited | Administrative & support | 2008 |
| GULT68 Ltd | Transport & logistics | 2019 |
| Gutan Limited | Construction | 2019 |
| Gutli Ltd | Real estate | 2023 |
| Gvilty Limited | Wholesale & retail | 2019 |
| GW Ultimate Concept Property Ltd | Hospitality | 2024 |
| GYP Dryliners Ltd | Construction | 2020 |
| H P Wines Ltd | Wholesale & retail | 2021 |
| H&C Home Improvements Ltd | Construction | 2024 |
| HAI Shun Restaurant Ltd | Hospitality | 2023 |
| Haines & Warwick Stonemasons Limited | Construction | 1991 |
| Hair by SAM Robinson Ltd | Other services | 2025 |
| Hakimsi Ltd | Professional & scientific | 2024 |
| Hakkavod Properties Ltd | Real estate | 2022 |
| Haley Connections Ltd | Information & communication | 2026 |
| Hands on Skills Training London Ltd | Education | 2025 |
| Handyhaus Ltd | Other services | 2026 |
| Haneddie Limited | Real estate | 2023 |
| Hani Haulage Ltd | Transport & logistics | 2026 |
| Happy Building & Maintenance Ltd | Construction | 2024 |
| Harm Prevention CIC | Public administration | 2023 |
| Harmony Consult Ltd | Professional & scientific | 2012 |
| Harts Properties (UK) Ltd | Real estate | 2024 |
| Harvest Network Ltd | Financial services | 2026 |
| HAS84 Limited | Hospitality | 2026 |
| Hass Recovery Ltd | Transport & logistics | 2026 |
| Hatfield Services Ltd | Real estate | 2025 |
| Havering Tyre & Battery Co. Limited | Wholesale & retail | 1976 |
| HDM Decorating Ltd | Construction | 2016 |
| Headstart Nursery 2 Ltd | Education | 2019 |
| Headway Sports C.I.C. | Education | 2023 |
| Healing Crystals Ltd | Wholesale & retail | 2022 |
| Healthy Futures Global | Administrative & support | 2026 |
| Heel to TOE Ltd | Health & social care | 2019 |
| Hellenic Health & Safety Solutions Ltd | Administrative & support | 2018 |
| Helpers at Hand Ltd | Health & social care | 2024 |
| HEP Care Services Limited | Health & social care | 2025 |
| Herbal Squad Ltd | Health & social care | 2023 |
| Heritage Design & Builds (SE) Ltd | Construction | 2025 |
| Heritage Lite Services Ltd | Manufacturing | 2017 |
| Hi-Fi Media Group Ltd | Information & communication | 2026 |
| Hicunoi Ltd | Wholesale & retail | 2022 |
| Highluxe Investments Ltd | Real estate | 2023 |
| Highways & Construction Ltd | Construction | 2024 |
| HJ Optometry Ltd | Health & social care | 2025 |
| HLG Solutions Ltd | Information & communication | 2024 |
| HNB Group Ltd | Households | 2025 |
| Holawells Limited | Administrative & support | 2022 |
| Home Care Building Services Ltd | Construction | 2018 |
| Home Designings Ltd | Professional & scientific | 2023 |
| Home Joy Properties Limited | Real estate | 2017 |
| Home Spired Limited | Wholesale & retail | 2018 |
| Homeline Property Renovation Ltd | Construction | 2012 |