| Green Dimension London Limited | Real estate | 2022 |
| Green Garden Construct Ltd | Administrative & support | 2025 |
| Green Garnet Estate Ltd | Real estate | 2024 |
| Green Grass 4 Life Ltd | Wholesale & retail | 2022 |
| Green Homes Investment & Management Ltd | Real estate | 2011 |
| Green Link Energy Services Ltd | Construction | 2021 |
| Greencem Limited | Professional & scientific | 1972 |
| Greeneleaf Property Management Limited | Real estate | 2024 |
| Greenland Property Investments Limited | Real estate | 2017 |
| Greenway Landscapes and Gardens Ltd | Administrative & support | 2020 |
| Greenwood Joinery and Glass Limited | Manufacturing | 2021 |
| Greenwood Joinery UK Ltd. | Manufacturing | 2016 |
| Grenfell Road (Mitcham) Ltd | Households | 2025 |
| GRG Fixing Ltd | Construction | 2023 |
| Grid Line Fitters Ltd | Construction | 2019 |
| Griffin Nutrition Ltd. | Health & social care | 2013 |
| Grigoriciuc Construction Ltd | Construction | 2025 |
| Grill Energy Solution(Uk) Limited | Wholesale & retail | 2018 |
| Growing Young Minds Limited | Education | 2016 |
| Growthplacewellness Limited | Education | 2026 |
| GSA Property Services Ltd | Construction | 2022 |
| GSK Construction Ltd | Construction | 2015 |
| GSK Ventures Ltd | Hospitality | 2024 |
| GSL Limited | Manufacturing | 2026 |
| Gtanku Limited | Manufacturing | 2025 |
| Gtve Building Ltd | Construction | 2016 |
| Guardian Shield Services Ltd | Administrative & support | 2023 |
| Gujjaruk Ltd | Wholesale & retail | 2025 |
| Gulfline Group Ltd | Other services | 2018 |
| Gulugul Ltd | Wholesale & retail | 2025 |
| Gurcontractors Ltd | Construction | 2020 |
| Gwnt Homes Ltd | Real estate | 2026 |
| GWU Wholesale UK Ltd | Wholesale & retail | 2022 |
| Gyasi SAM 1270 Limited | Transport & logistics | 2014 |
| Gymbabe Ltd | Wholesale & retail | 2019 |
| Gynaysmart Limited | Health & social care | 2022 |
| Gyrus IT Solutions Ltd | Information & communication | 2025 |
| H Chambers Maintenance Services Ltd | Construction | 2026 |
| H G S (Intl) Limited | Professional & scientific | 2009 |
| H H Tyres Services Ltd | Other services | 2020 |
| H M Enterprises (U K) Limited | Wholesale & retail | 1998 |
| H&L Hand Car Wash Ltd | Other services | 2012 |
| H&S Building Renovations Ltd | Construction | 2024 |
| H.Maroc Ltd | Administrative & support | 2021 |
| H7K Ltd | Hospitality | 2025 |
| H8 Consulting Ltd | Professional & scientific | 2022 |
| Habari Logistics Limited | Administrative & support | 2025 |
| Habib&Co.Uk Ltd | Wholesale & retail | 2026 |
| Hadland Contracts Limited | Construction | 1998 |
| Hadley Road Community Allotment CIC | Agriculture & fishing | 2023 |
| Hagios Advisory Limited | Professional & scientific | 2025 |
| Haha Contractors Limited | Health & social care | 2017 |
| Haidri Property Management Ltd | Real estate | 2022 |
| Haikara Ltd | Administrative & support | 2025 |
| Hair and Beauty Academy Pro Ltd | Education | 2025 |
| Hair by Diér Limited | Other services | 2025 |
| Hairdressing Station Ltd | Other services | 2012 |
| Haireditory Limited | Other services | 2025 |
| Hakas Developments Limited | Real estate | 2025 |
| Hakkamoon Ltd | Hospitality | 2025 |
| Hala Digital Ltd | Wholesale & retail | 2026 |
| Haliq Inspirational Women Ltd | Administrative & support | 2018 |
| Hall's GAS & Plumbing Services Limited | Construction | 2022 |
| Hamad ALI Cars Ltd | Administrative & support | 2025 |
| Hamdan Traders Ltd | Wholesale & retail | 2025 |
| Hamza Iftikhar Ltd | Wholesale & retail | 2026 |
| Hannah Oliver Ltd | Other services | 2026 |
| Happy Dogs Ltd | Agriculture & fishing | 2019 |
| Happy Home Building Solutions Ltd | Construction | 2025 |
| Happy Homes Services Ltd | Construction | 2016 |
| Hapus Care Group Ltd | Administrative & support | 2024 |
| Harbits Ltd | Construction | 2022 |
| Harbor and Hill Ltd | Real estate | 2025 |
| Harding EDE Groundcare Ltd | Administrative & support | 2012 |
| Hareram Engineer Ltd | Construction | 2011 |
| Harn Limited | Information & communication | 2015 |
| Harrington Global Service Limited | Arts & recreation | 2025 |
| Harris Reed Recruitment Ltd | Administrative & support | 2016 |
| Hartfelt Travel Ltd | Administrative & support | 2025 |
| Hartgate Motor Cycles Limited | Wholesale & retail | 1992 |
| Hartgate of Mitcham Limited | Wholesale & retail | 2012 |
| Hartgate Spares & Workshop Limited | Wholesale & retail | 2001 |
| Hartley Wintney Autotech Ltd | Wholesale & retail | 2020 |
| Hartmore of London Ltd | Manufacturing | 2025 |
| Hatc Limited | Professional & scientific | 2003 |
| Haven Way 1 Ltd | Real estate | 2026 |
| Haven Way Holdings Ltd | Financial services | 2026 |
| Havenforher CIC | Health & social care | 2026 |
| Havenmill Homes Ltd | Real estate | 2025 |
| Havenmill Property Solutions Ltd | Real estate | 2025 |
| Havenwithin Ltd | Education | 2025 |
| Hawatam Limited | Health & social care | 2019 |
| Hawk Digital Services Ltd | Information & communication | 2019 |
| Hayes Accountants Ltd | Professional & scientific | 2016 |
| Haywire Productions Limited | Information & communication | 2022 |
| HBA Group Ltd | Construction | 2022 |
| Hcmdrylining Ltd | Construction | 2023 |
| HD Creating Ltd | Construction | 2021 |
| HDS Traders Limited | Wholesale & retail | 2021 |
| Headway Community Care CIC | Other services | 2023 |