| Fudge Learn Limited | Information & communication | 2017 |
| Funder Consulting Ltd | Professional & scientific | 2024 |
| G & L Holdings Group Limited | Information & communication | 2019 |
| G.M. Valentine Ltd | Other services | 2024 |
| Galactus Solutions Ltd | Other services | 2023 |
| Garton Jones ( Albert Embankment) Limited | Real estate | 2013 |
| Garton Jones (Chelsea) Limited | Real estate | 2016 |
| Garton Jones (London) Limited | Real estate | 2021 |
| Garton Jones (Riverlight) Limited | Real estate | 2012 |
| Garton Jones (Westminster) Limited | Real estate | 2007 |
| Gaya Properties Ltd | Real estate | 2019 |
| GEL Property Investments Limited | Real estate | 2026 |
| Gingerrob Limited | Construction | 2013 |
| Giodom Property Limited | Real estate | 2022 |
| GJR Property Consultants Limited | Real estate | 2010 |
| Gleno Electrical Services Limited | Construction | 2018 |
| Glossy Tanning & Beauty Ltd | Other services | 2023 |
| Glossy Tanning Ltd | Other services | 2025 |
| GM Developments South East Ltd | Construction | 2024 |
| Go 2 Scaffolding Limited | Construction | 2017 |
| Golfs Green Jacket Ltd | Households | 2021 |
| Gowen Property Ltd | Real estate | 2022 |
| Gpsi PRC Limited | Households | 2024 |
| GPW Racing Limited | Arts & recreation | 2018 |
| Grading Limited | Water & waste | 2019 |
| Gray Construction Ltd | Construction | 2018 |
| Gray Pre-Schools Ltd. | Administrative & support | 2020 |
| Green Beare Ltd | Agriculture & fishing | 2021 |
| Green Engineering Group Ltd | Professional & scientific | 2024 |
| Green Leaves Construction Limited | Construction | 2025 |
| Greenacres Riding School Limited | Administrative & support | 1961 |
| Greenfields Plumbing Ltd | Construction | 2015 |
| Griffin Chaperones Limited | Administrative & support | 2022 |
| H Happer Electrical Ltd | Construction | 2026 |
| Halobaits Ltd | Wholesale & retail | 2023 |
| Hamilton INV Ltd | Real estate | 2022 |
| Harry Kelly Associates Ltd | Professional & scientific | 2026 |
| Hawkwood Electrical Limited | Construction | 2016 |
| HC Mason Ltd | Other services | 2022 |
| Heath & City Brokers Ltd | Financial services | 2021 |
| Heathfield Keston Limited | Hospitality | 2020 |
| Heathview Property Management Ltd | Other services | 2026 |
| Henman Investment Ltd | Real estate | 2021 |
| Highgate Flowers Limited | Wholesale & retail | 2016 |
| Hiremyrooms Ltd | Real estate | 2019 |
| Holdway Property Maintenance Limited | Construction | 2015 |
| Hollamby Homes Ltd | Real estate | 2019 |
| Hollie Noelle Ltd | Other services | 2025 |
| Holwood Farm Limited | Wholesale & retail | 2009 |
| Homeofselftransformation Ltd | Education | 2024 |
| Hope 4 the World | Education | 2007 |
| House of Style (London) Ltd | Arts & recreation | 2021 |
| IDA Homes Ltd | Construction | 2022 |
| Ielec Limited | Construction | 2022 |
| Ijola Ltd | Construction | 2018 |
| Image Uniforms Ltd | Wholesale & retail | 2022 |
| Ingenium Construction Consultancy Ltd | Construction | 2013 |
| Innovate Build & Design Ltd | Construction | 2025 |
| Inside Tech Computers Limited | Administrative & support | 2016 |
| Inside-Techrepairs Ltd | Manufacturing | 2019 |
| Inspire Sport Skills Ltd | Education | 2018 |
| Intuitive Breathwork Ltd | Education | 2025 |
| It's a GAS Consultancy Limited | Professional & scientific | 2007 |
| J L Cooper Ltd | Construction | 2024 |
| J N C Group Ltd | Wholesale & retail | 2016 |
| J O'Sullivan Group Ltd | Construction | 2020 |
| Jackson Rose Ltd | Real estate | 2020 |
| James Bond Trading Limited | Construction | 1989 |
| Javadeal Limited | Households | 1985 |
| JBS Business Solutions Limited | Professional & scientific | 2013 |
| JC Clean Limited | Administrative & support | 2019 |
| JC Cleaning & Maintenance Limited | Administrative & support | 2021 |
| JGD1 Building Services Limited | Construction | 2022 |
| JH Consulting (London) Ltd | Professional & scientific | 2024 |
| JJ Locksmiths Limited | Construction | 2015 |
| JJH Associates Limited | Arts & recreation | 2011 |
| JJW Power & Jointing Services Ltd | Construction | 2026 |
| Jocalex Ltd | Administrative & support | 2025 |
| JOE Chalker Investments Ltd | Real estate | 2024 |
| John Hughes Builders Ltd | Construction | 2002 |
| Joyce Joinery Limited | Construction | 2020 |
| JP Sales (UK) Limited | Wholesale & retail | 2008 |
| JRN Asset Holdings LLP | | 2022 |
| JRN Garages Limited | Wholesale & retail | 2014 |
| JRN Holdings Ltd | Wholesale & retail | 2015 |
| Junction Communications Limited | Professional & scientific | 2015 |
| Junk N Disorderly Ltd | Water & waste | 2023 |
| JZA Estates Limited | Real estate | 2025 |
| K.S Smart Vehicle Repair Ltd | Wholesale & retail | 2025 |
| Kaizen Daily Limited | Wholesale & retail | 2025 |
| Kayi Training Ltd | Arts & recreation | 2024 |
| KC Property Group Limited | Real estate | 2022 |
| KEN Amblin Associates Limited | Construction | 2011 |
| Keston Car Sales Limited | Wholesale & retail | 2015 |
| Keston Estates Limited | Real estate | 2019 |
| Keston Events Limited | Arts & recreation | 2019 |
| Keston Kitchens and Interior Spaces Ltd | Professional & scientific | 2024 |
| Keston One Limited | Arts & recreation | 2020 |
| Keston Park Management Limited | Households | 1983 |
| Keston Tollgate Service Station Limited | Wholesale & retail | 2023 |