| Hampton & Molesey Property Ltd | Real estate | 2025 |
| Hampton Green Apartments Resident Association Limited | Households | 1998 |
| Hampton Medical Consulting Ltd | Health & social care | 2025 |
| Hampton Wick Court (NO.2) Management Limited | Households | 1996 |
| Hampton Wick Sports Club Ltd | Arts & recreation | 2024 |
| Hamsmith Limited | Manufacturing | 2024 |
| Handmade Workshops Ltd | Arts & recreation | 2018 |
| Hannah Walsh Limited | Other services | 2020 |
| Hanoi Drip Ltd | Hospitality | 2025 |
| Hanzo Solution Ltd | Transport & logistics | 2023 |
| Hapony Limited | Information & communication | 2023 |
| Happy Coder Industries Limited | Information & communication | 2022 |
| Happy Coder Ltd | Information & communication | 2012 |
| Happylarry Limited | Information & communication | 2017 |
| Harben Holmes Ltd | Construction | 2025 |
| Harewood Media Limited | Information & communication | 2011 |
| Harold Court (Teddington) Management Limited | Households | 1964 |
| Harper Alex Ltd | Construction | 2024 |
| Hatfiled Trans Ltd | Transport & logistics | 2017 |
| Hayer Fleming Ltd | Professional & scientific | 2009 |
| Head Kandi Limited | Other services | 2015 |
| Head Retail Limited | Professional & scientific | 2005 |
| Headley Green Project Management Ltd | Construction | 2026 |
| Health and Beauty Brands Ltd | Professional & scientific | 2013 |
| Health Foods London Ltd | Wholesale & retail | 2024 |
| Heap Associates Limited | Professional & scientific | 2017 |
| Heartwood Bidco Limited | Financial services | 2024 |
| Heartwood Collection Holdings Limited | Professional & scientific | 2011 |
| Heartwood Collection Limited | Hospitality | 2006 |
| Heartwood Inns 2 Limited | Hospitality | 2024 |
| Heartwood Inns Limited | Hospitality | 2010 |
| Heartwood Midco 1 Limited | Financial services | 2024 |
| Heartwood Midco 2 Limited | Financial services | 2024 |
| Heartwood Propco Limited | Hospitality | 2024 |
| Heartwood Topco Limited | Financial services | 2024 |
| Heathrow Fuels Limited | Wholesale & retail | 2014 |
| Hector Freight UK Ltd | Transport & logistics | 2017 |
| Helen Levien Studios Limited | Professional & scientific | 2023 |
| Henderson Strategic Solutions Ltd | Professional & scientific | 2025 |
| Henric-S Construction Ltd | Construction | 2026 |
| Henry Lenox Industrial Limited | Wholesale & retail | 1977 |
| HER Cricket Collective Ltd | Education | 2026 |
| HER Rayn Ltd | Manufacturing | 2026 |
| Heritage Coins Limited | Extraterritorial | 2022 |
| Heron House(Hampton Wick)Residents Association Limited | Households | 1965 |
| Heros Technology Limited | Wholesale & retail | 2005 |
| Heypi Care Services Limited | Health & social care | 2020 |
| HHC Insights Ltd | Professional & scientific | 2025 |
| High Dive Music Ltd | Professional & scientific | 2023 |
| Hikari Snowsports Limited | Administrative & support | 2025 |
| Hillfort Productions LLP | | 2013 |
| Hillman Consultancy Services Limited | Information & communication | 2007 |
| Hillsilk Limited | Professional & scientific | 1998 |
| Hipparchus Financial Limited | Administrative & support | 2012 |
| HIT the Lights Limited | Information & communication | 2024 |
| HJ C Consultancy Services Ltd | Professional & scientific | 2025 |
| HL Coaching Limited | Administrative & support | 2019 |
| HLS Property Ltd | Real estate | 2025 |
| HNG Online Limited | Professional & scientific | 2020 |
| Hohahand Limited | Construction | 1998 |
| Holst Foundation(The) | Education | 1981 |
| Holyhead Court Residents Association Limited | Households | 1959 |
| Home 150 Limited | Real estate | 2012 |
| Home 4 Life 77 Ltd | Construction | 2021 |
| Home by J&S Limited | Households | 2021 |
| Hook, Block & Blade Limited | Real estate | 2025 |
| Hoopla Fish Media Limited | Information & communication | 2004 |
| Hope for Peace CIC | Health & social care | 2024 |
| Horizone Line Property Services Ltd | Construction | 2017 |
| Hornets Kensington Ltd | Wholesale & retail | 2022 |
| HOSKINS8 Ltd | Professional & scientific | 2025 |
| Hosteria Ltd | Hospitality | 2025 |
| Hot Embers BBQ Events Limited | Hospitality | 2024 |
| Hotel Elephant Camberwell Road Limited | Real estate | 2025 |
| Hotel Elephant Spare Street Ltd | Arts & recreation | 2009 |
| Hotel Elephant ST John’S School Limited | Real estate | 2022 |
| Hotpod Yoga Kensington Limited | Arts & recreation | 2023 |
| Houghton Hosting & Web Services Limited | Information & communication | 2011 |
| House of VFX Ltd | Information & communication | 2022 |
| Howsy Limited | Information & communication | 2014 |
| Howzat Consultancy Ltd | Professional & scientific | 2025 |
| HPS Developments Limited | Households | 2010 |
| Hreh Futures Limited | Financial services | 2019 |
| HRT Cleaning Limited | Other services | 2016 |
| Hscd Ltd | Health & social care | 2004 |
| HSJ Building Specialist Ltd | Construction | 2025 |
| HT Essentials Ltd | Wholesale & retail | 2023 |
| HTP Architecture LLP | | 2003 |
| Human X Limited | Professional & scientific | 2003 |
| Humest Ltd | Professional & scientific | 2010 |
| Hungarian Community Limited | Administrative & support | 2009 |
| Hunparts Ltd | Wholesale & retail | 2010 |
| Hurworth Consulting Limited | Professional & scientific | 2019 |
| Hybrid Business Ltd | Information & communication | 2026 |
| Hybrid Business Solutions Ltd | Information & communication | 2019 |
| Hyde Communications Ltd | Professional & scientific | 2012 |
| I Feel Empowered Ltd | Education | 2018 |
| I on the World Limited | Professional & scientific | 2007 |
| I.Rogers Heating & Plumbing Limited | Construction | 2022 |
| Iamfromoz Ltd | Professional & scientific | 2024 |