| Grace&Grit Collective Ltd | Professional & scientific | 2024 |
| Grana Limited | Hospitality | 2018 |
| Greater London Property Investments Ltd | Real estate | 2011 |
| Green Lane Projects Ltd | Construction | 2023 |
| Greenoaks Corporate Limited | Transport & logistics | 2011 |
| Grindelwald 1 Limited | Other services | 2018 |
| Grindelwald 2 Limited | Other services | 2018 |
| Grindelwald 3 Limited | Other services | 2018 |
| Gritlab Limited | Education | 2026 |
| Grosvenor Gardens (Purley) Management Limited | Households | 2007 |
| Grovewood Investments Limited | Real estate | 2016 |
| Grow Analytics Ltd | Information & communication | 2025 |
| Grow High Level Ltd | Information & communication | 2025 |
| GSE Skips (Recycling) Limited | Water & waste | 2011 |
| Guychard Ltd | Health & social care | 2015 |
| GYE Nyame Tolo Beef Ltd | Professional & scientific | 2024 |
| Gym Concept Ltd | Arts & recreation | 2015 |
| Gyto Limited | Professional & scientific | 2015 |
| G’S Childrens Community CIC | Health & social care | 2025 |
| H & B Services London Ltd | Construction | 2019 |
| H & K Boss LLP | | 2006 |
| H & T Assets Ltd | Wholesale & retail | 2022 |
| H F Hussain Ltd | Wholesale & retail | 2024 |
| H&A Consulting Limited | Education | 2009 |
| H.C.N. Trustees Limited | Construction | 1957 |
| Haastrup Properties Limited | Real estate | 2020 |
| Halling Advisory Ltd | Administrative & support | 2026 |
| Hama Purley Barber Ltd | Other services | 2022 |
| Hammock Shop UK Limited | Wholesale & retail | 2023 |
| Hampton Bricks Ltd | Real estate | 2019 |
| Hampton Stones Limited | Real estate | 2019 |
| Hanver Limited | Arts & recreation | 1987 |
| Hanway Developments Limited | Real estate | 2006 |
| Harbour Light Properties Limited | Health & social care | 2006 |
| Hardhat Tradie Ltd | Information & communication | 2025 |
| Harestone Homes Ltd | Construction | 2022 |
| Harma Jewelry Ltd | Wholesale & retail | 2025 |
| Harmony Cleaning Co. Ltd | Administrative & support | 2025 |
| Harra Estates & Property Ltd | Real estate | 2025 |
| Harrington Beck Limited | Professional & scientific | 2025 |
| Hartley Consultants Limited | Information & communication | 2009 |
| Hartley Down Estate Management Limited | Households | 2025 |
| Hartley Square Holding Limited | Real estate | 2005 |
| Hartley Square Limited | Construction | 2019 |
| Harvest Community Network | Other services | 2000 |
| Havir Ltd | Hospitality | 2025 |
| Hawker Stands Ltd | Hospitality | 2025 |
| Hayat Residentials Limited | Real estate | 2026 |
| Haydn Gpcare Ltd | Health & social care | 2020 |
| Haymerle Road Limited | Construction | 2024 |
| Hazel Residences Ltd | Hospitality | 2014 |
| HCS Investments Limited | Professional & scientific | 2004 |
| HD Vision Optics Ltd | Health & social care | 2021 |
| Hdbromly Co Limited | Hospitality | 2025 |
| Healthcare Support 24 Ltd | Health & social care | 2025 |
| Healthtrace Ltd | Health & social care | 2013 |
| Heathercroft Medical Ltd | Health & social care | 2026 |
| Hebrews 13 Ltd | Real estate | 2024 |
| Heed Leadership Development Ltd | Professional & scientific | 2023 |
| Heer Homes Limited | Real estate | 2017 |
| Heideweg Limited | Real estate | 2024 |
| Heighten Ltd | Professional & scientific | 2020 |
| Held Accountable Management Ltd | Administrative & support | 2019 |
| Helen Hovris Medical Awards and Services Ltd | Professional & scientific | 2026 |
| Helix Consultants Limited | Information & communication | 2024 |
| Helix Electronics Limited | Manufacturing | 2025 |
| Helloremovals Ltd | Transport & logistics | 2025 |
| Herel UK Limited | Real estate | 2019 |
| Heritage Estates London Limited | Real estate | 2016 |
| Heritage Professional Services Limited | Administrative & support | 2010 |
| Hersi&Co Ltd | Information & communication | 2021 |
| Hewitts Electrical Limited | Construction | 2020 |
| Hidden Faces Ltd | Professional & scientific | 2022 |
| Hiddengem Hub Ltd | Wholesale & retail | 2023 |
| High Class Touch Ltd | Wholesale & retail | 2022 |
| High Pines Residential Home Limited | Health & social care | 2009 |
| Higher Link Ltd | Administrative & support | 2023 |
| Highgate House Management Limited | Households | 2025 |
| Highland Road (Purley) Management Company Limited | Households | 2010 |
| Hillcrest Purley Management Limited | Households | 2021 |
| Hillcrest RES. Assoc. (Purley) Limited | Households | 1993 |
| Hillcrest Rising Stars Day Nursery Limited | Education | 2018 |
| Hitech Gadgets Limited | Wholesale & retail | 2019 |
| HK Phones Ltd | Wholesale & retail | 2025 |
| HKB Risk Consulting Ltd | Professional & scientific | 2020 |
| HKR Property Limited | Real estate | 2024 |
| HLN Healthcare Ltd | Health & social care | 2019 |
| HMG Global Monument Heritage Group Ltd | Professional & scientific | 2020 |
| HNM Properties Limited | Real estate | 2013 |
| HOI Polloi Ltd | Professional & scientific | 2011 |
| Holly Tree Global Ltd | Wholesale & retail | 2022 |
| Holt Place (Management) Ltd | Administrative & support | 2019 |
| Home Buildings Limited | Real estate | 1999 |
| Homeato Ltd | Other services | 2024 |
| Homestead Housing Limited | Hospitality | 2023 |
| Horn Cutting Tools Limited | Manufacturing | 2007 |
| House of Afrika Ltd | Manufacturing | 2009 |
| House of Moore Ltd | Hospitality | 2025 |
| House of Suchintita Ltd | Wholesale & retail | 2024 |
| Houseofvanityuk Ltd | Other services | 2019 |