| Gruppo Santino Ltd | Financial services | 2025 |
| GSW Construction & Engineering Ltd | Construction | 2025 |
| GT Renovations Ltd | Administrative & support | 2023 |
| Gtasf Ltd | Real estate | 2024 |
| GTM Strategies Ltd | Professional & scientific | 2022 |
| Guarapita Limited | Real estate | 2014 |
| Gull JEE Ltd | Other services | 2015 |
| GUY Paul & Co Limited | Manufacturing | 2018 |
| GUY Property Ltd | Households | 2023 |
| GUY Spence Consulting Limited | Professional & scientific | 2015 |
| GVM Advisors Ltd | Professional & scientific | 2026 |
| GX Wholesalesolutions Ltd | Wholesale & retail | 2024 |
| H & H Gelato Ltd | Hospitality | 2020 |
| H & H Partners Limited | Professional & scientific | 2013 |
| H Atkins Consultants Ltd | Other services | 2025 |
| H W F Number Five Limited | Extraterritorial | 1985 |
| Hailsham House Limited | Professional & scientific | 2025 |
| Hair by Sara Bergantini Ltd | Other services | 2026 |
| Hakbos Limited | Administrative & support | 2018 |
| Hale Property Enterprise Ltd | Real estate | 2014 |
| HALE360 Solutions Ltd | Health & social care | 2014 |
| Half-A-Second Studios Ltd | Information & communication | 2007 |
| Hali Safe Cleaning Ltd | Administrative & support | 2025 |
| Hamilton House Residents Association Limited | Households | 1988 |
| Hammonds Cleaning Ltd | Administrative & support | 2021 |
| Hampton Wick Court Management Limited | Real estate | 1996 |
| Hamza Hydro Limited | Professional & scientific | 2025 |
| Hand Coded Limited | Information & communication | 2017 |
| Handley-Nicholson Consultants Limited | Professional & scientific | 1997 |
| Handyman Station Limited | Construction | 2024 |
| Hanidi Food Ltd | Hospitality | 2020 |
| Hanly Accounting Services Limited | Professional & scientific | 2015 |
| Hannent Construction Ltd | Construction | 2018 |
| Hanrin Homes Ltd | Real estate | 2020 |
| Hansen Trading Ltd | Wholesale & retail | 2024 |
| Happy Mandarin Ltd | Education | 2019 |
| Hard Yards Management Limited | Information & communication | 2013 |
| Hardy Home Developments Ltd | Construction | 2023 |
| Hari Bakes Ltd | Hospitality | 2025 |
| Hari OM Building Limited | Wholesale & retail | 2023 |
| Harija Ltd | Information & communication | 2018 |
| Harmony 2014 Ltd | Health & social care | 2014 |
| Harper Oval Ltd | Real estate | 2016 |
| Harrow Land & House Limited | Households | 1985 |
| Hartman Building Services Ltd | Construction | 2024 |
| HAS Studio LLP | | 2020 |
| Hatfield House Residents Association Limited(The) | Households | 1978 |
| Hathor Capital Brokers Ltd | Administrative & support | 2014 |
| Have a Word Limited | Arts & recreation | 2006 |
| Havercroft Limited | Arts & recreation | 2010 |
| Havilland Place Residents Company Limited | Households | 2007 |
| Hawkeye Atlantic Limited | Administrative & support | 2015 |
| Hawksburn Ltd | Professional & scientific | 2016 |
| Hawkshire Holdings Ltd | Professional & scientific | 2026 |
| Hawthorne Avenue Ltd | Real estate | 2023 |
| HAY Catering Ltd | Hospitality | 2024 |
| Hayat Traders Limited | Wholesale & retail | 2021 |
| Hayes & Jarvis (Travel) Limited | Administrative & support | 1952 |
| Haymaker Communications Limited | Professional & scientific | 2023 |
| Haz-Bins Ltd | Water & waste | 2026 |
| Hazelwood Court (Surbiton) Management Company Limited | Real estate | 1986 |
| HBK Enterprises Ltd | Real estate | 2021 |
| HC Practice Limited | Professional & scientific | 2023 |
| HD Contractors Ltd | Construction | 2014 |
| HD Tech Mobile & Vape Ltd | Wholesale & retail | 2008 |
| Hddr Limited | Real estate | 2017 |
| HDL Consultancy Limited | Professional & scientific | 2024 |
| Head Shot Mofo Limited | Information & communication | 2020 |
| Headmasters Operations Limited | Administrative & support | 2017 |
| Headmasters Salons Limited | Other services | 2010 |
| Headwater Holidays Limited | Administrative & support | 2002 |
| Healthcare Base Limited | Information & communication | 2025 |
| Healthfirst Care Limited | Wholesale & retail | 2004 |
| Heartscape Properties Ltd | Real estate | 2023 |
| Heatronix Ltd | Other services | 2022 |
| Hebrey Limited | Hospitality | 1997 |
| Heligert Gojda Limited | Administrative & support | 2019 |
| Hello Meals Limited | Hospitality | 2025 |
| Helmo Limited | Information & communication | 2015 |
| Heloisad Limited | Professional & scientific | 2024 |
| Helpyard Limited | Information & communication | 2012 |
| Hema Estates Ltd | Real estate | 2023 |
| Hema Solutions Limited | Information & communication | 2010 |
| Heman Investment Holdingco Limited | Financial services | 2026 |
| Hemline Productions LLP | | 2010 |
| Hemsby Express Limited | Wholesale & retail | 2022 |
| Henderson Millbrae Limited | Professional & scientific | 2011 |
| Henry Gray Project Management Limited | Professional & scientific | 2014 |
| Henry T Smith & Co Limited | Professional & scientific | 2003 |
| Heritage Revival London Ltd | Construction | 2025 |
| Hermond Capital Ltd | Financial services | 2017 |
| Herne Clinics Ltd | Other services | 2022 |
| Herne Property Limited | Real estate | 2014 |
| Heroes at Large Productions Limited | Information & communication | 2025 |
| Heston Grosvenor Management Company Limited | Households | 1982 |
| Hexacube Ltd | Information & communication | 2017 |
| Hexagon Design Contracts Limited | Manufacturing | 1997 |
| Hexagon Services Ltd | Administrative & support | 2025 |
| HFG Consulting Ltd | Health & social care | 2020 |
| HFI Healthcare Limited | Health & social care | 2019 |