| Grisley Wood's Ltd | Manufacturing | 2020 |
| GRM Services Limited | Construction | 2017 |
| Grooming by Lucy Limited | Other services | 2020 |
| Grosvenor Flowers Limited | Wholesale & retail | 2017 |
| Grotbags Cleaning Services Ltd | Administrative & support | 2023 |
| Grouplogix Ltd | Information & communication | 2017 |
| Grove Solutions (U.K) Limited | Other services | 2021 |
| Grovewood Property Services (UK) Limited | Households | 2012 |
| Gruze Limited | Professional & scientific | 2026 |
| Gryffindor Limited | Administrative & support | 2000 |
| GS Import & Exports Ltd | Wholesale & retail | 2012 |
| GS Plumbers Limited | Construction | 2014 |
| GS Projects Limited | Other services | 2024 |
| GSD Construction Group Limited | Construction | 2018 |
| GSM Solutions Limited | Construction | 2022 |
| GSN Worldwide Ltd | Administrative & support | 2025 |
| GSP Flooring Ltd | Construction | 2015 |
| Gtrg Construction Limited | Construction | 2021 |
| Guard Tech Solutions Ltd | Administrative & support | 2025 |
| Guardian Healthcare Services Ltd | Public administration | 2025 |
| Guardian Security Fencing (Essex) | | 1994 |
| Guelder Rose Limited | Wholesale & retail | 2016 |
| Gulfreight Limited | Transport & logistics | 2000 |
| Gullett Services Limited | Construction | 2025 |
| Gumbley Capital Partners Ltd | Real estate | 2026 |
| Gunes Cosmetics Ltd | Administrative & support | 2017 |
| Gurney Consulting Engineers Ltd | Professional & scientific | 2023 |
| GUV Biring Designs Limited | Professional & scientific | 2014 |
| GVL Skills Limited | Education | 2026 |
| GWD 1 Ltd | Professional & scientific | 2024 |
| GWL Accessories Limited | Other services | 2025 |
| GWM Propco Limited | Real estate | 2021 |
| H & B Drainage Contractors Limited | Construction | 2003 |
| H & H Cladding Ltd | Construction | 2014 |
| H & J Pallets Limited | Transport & logistics | 2019 |
| H & M Compressors and Pumps Limited | Manufacturing | 1990 |
| H D Renders Limited | Construction | 2013 |
| H DAS Law Ltd | Professional & scientific | 2026 |
| H Enterprise London Ltd | Wholesale & retail | 2022 |
| H S Build & Services Limited | Construction | 2017 |
| H S W Accountancy Limited | Professional & scientific | 2020 |
| H&A Trading and Services Ltd | Wholesale & retail | 2021 |
| H-Bro Services Ltd | Construction | 2019 |
| H. & B. Groundwork Contractors Limited | Construction | 1983 |
| H.J. Bowler & Sons Limited | Water & waste | 1952 |
| H.J.T Electrical Services Ltd | Construction | 2025 |
| H4 Bespoke Ltd | Construction | 2019 |
| Haar Recruitment Limited | Other services | 2024 |
| Habetak Venture Ltd | Transport & logistics | 2019 |
| Habiba Foods Services Limited | Hospitality | 2025 |
| Habitat Architectural & Planning Consultancy Limited | Professional & scientific | 2024 |
| HAF Limited | Professional & scientific | 2017 |
| Haffner Kitchen Ltd | Manufacturing | 2021 |
| Hair by Lindz Ltd | Other services | 2023 |
| Hair Difference (UK) Limited | Other services | 2016 |
| Hairbyikky Ltd | Wholesale & retail | 2026 |
| Hairways (Hair & Beauty) Limited | Wholesale & retail | 1985 |
| HAK Accountancy Services Ltd | Professional & scientific | 2020 |
| Hakfm Ltd | Health & social care | 2026 |
| Hakuns Consulting Ltd | Professional & scientific | 2014 |
| Hallas Haulage Ltd | Transport & logistics | 2026 |
| Hallybone Electrical Ltd | Professional & scientific | 2021 |
| Halo Projects (Southeast) Ltd | Construction | 2022 |
| Halstows Ltd | Professional & scientific | 2012 |
| Hamilton & Mcguire Productions Ltd | Arts & recreation | 2025 |
| Hamilton Carpets Limited | Wholesale & retail | 2000 |
| Hamish Housing Limited | Construction | 2019 |
| Hammond & Sons ,GAS Plumbing and Heating Ltd | Construction | 2013 |
| Hampstead Homes Retail Limited | Wholesale & retail | 2020 |
| Hampton Court Property Management Limited | Real estate | 2011 |
| Hanakapa Care Services Limited | Health & social care | 2023 |
| Hanat Educational Services Ltd. | Education | 2017 |
| Hancor H Limited | Construction | 2023 |
| Hannah a Limited | Health & social care | 2021 |
| Hannaway Commercial Property Limited | Other services | 2024 |
| Hannie Foodhub Limited | Hospitality | 2026 |
| Hans Food Limited | Hospitality | 2023 |
| Hans Kebab & Cafe Limited | Hospitality | 2024 |
| Hanush Transport Ltd | Transport & logistics | 2024 |
| Hapidayz Ltd | Hospitality | 2015 |
| Happiness Care Home Limited | Health & social care | 2025 |
| Happy Hearts Pamper BUS Limited | Other services | 2026 |
| Haque Properties Services Ltd | Real estate | 2023 |
| HAR Electrical Ltd | Construction | 2026 |
| Harbora (City) Limited | Real estate | 2003 |
| Harbora Properties Limited | Extraterritorial | 1998 |
| Harborlight Holdings Ltd | Real estate | 2023 |
| Harborstone Investments Limited | Real estate | 2024 |
| Hardell Fruiterers Limited | Wholesale & retail | 2006 |
| Harding Brothers Electrical Limited | Construction | 2020 |
| Harisri Consultancy Limited | Information & communication | 2010 |
| Harley and Friends Ltd | Wholesale & retail | 2024 |
| Harley Street Medical Consultants Ltd | Health & social care | 2017 |
| Harley-West Marketing & Communications Limited | Professional & scientific | 2013 |
| Harmanlik Ltd | Hospitality | 2022 |
| Harmonia Wellbeing Ltd | Health & social care | 2026 |
| Harmonic Music Limited | Information & communication | 2014 |
| Harmony Care Home Ltd | Hospitality | 2024 |
| Harmony Joinery Ltd | Construction | 2017 |
| Harper Russo Ltd | Administrative & support | 2022 |