| Health by Stealth Ltd | Professional & scientific | 2025 |
| Health Dynamics Consulting Ltd | Professional & scientific | 2010 |
| Healthworks Clinic Ltd | Health & social care | 2004 |
| Heart Centred Business Limited | Professional & scientific | 2015 |
| Heart to Heart Home Care and Cleaning Limited | Public administration | 2024 |
| Heat Haze Pictures Limited | Information & communication | 2017 |
| Heat Pump Service Solutions Ltd | Construction | 2025 |
| Heath Legal Limited | Professional & scientific | 2016 |
| Heather Godsmark Ltd | Administrative & support | 2002 |
| Heating & Cooling Solutions Limited | Construction | 2002 |
| Heatserve Sussex Ltd | Construction | 2026 |
| Heaver Agriculture Limited | Agriculture & fishing | 2022 |
| Heaver Farms Limited | Agriculture & fishing | 1993 |
| Hector FOX Limited | Real estate | 2021 |
| Hector Property II Ltd | Real estate | 2021 |
| Hector Property Ltd | Construction | 2010 |
| Heene Lodge Tenants Association Limited | Households | 1962 |
| Heist Market Limited | Hospitality | 2021 |
| Helen's Airport Cars Limited | Transport & logistics | 2002 |
| Helium Swan Limited | Professional & scientific | 2025 |
| Helix WL 001 Ltd | Administrative & support | 2022 |
| Hellcats Cheerleaders Elite CIC | Education | 2026 |
| Hellcats Cheerleaders Ltd | Education | 2011 |
| Hellebore & Rose Ltd | Administrative & support | 2022 |
| Hello Skips Limited | Water & waste | 2016 |
| Helm Estate Services Limited | Real estate | 2014 |
| Help With Handwriting Limited | Other services | 2021 |
| Helpful Hands Home Care Limited | Health & social care | 2022 |
| Helpful Heating Ltd | Construction | 2024 |
| Helping Solutions Ltd | Construction | 2025 |
| Helyer Farm Limited | Agriculture & fishing | 2012 |
| Hemer Associates Limited | Professional & scientific | 2010 |
| Hemisphere Events Ltd | Construction | 2024 |
| HEN Entertainment Limited | Arts & recreation | 2020 |
| Henderson Electrical Solutions Ltd | Construction | 2020 |
| Henderson Global Imports Limited | Wholesale & retail | 2002 |
| Henney Law Limited | Professional & scientific | 2018 |
| Henney Turner Law Limited | Professional & scientific | 2026 |
| Henry Braithwaite Ltd | Administrative & support | 2026 |
| Henson House Limited | Real estate | 2006 |
| Heoft Homes Ltd | Construction | 2015 |
| HER Menopause Hub Limited | Health & social care | 2026 |
| Here to Help YOU Ltd | Other services | 2025 |
| Heritage & Classic Ltd | Transport & logistics | 2023 |
| Heritage Business Solutions Limited | Professional & scientific | 2005 |
| Heritage Party Limited | Other services | 2020 |
| Hero Agents Ltd | Wholesale & retail | 2019 |
| Herongate Homes Limited | Construction | 2009 |
| Hershaw Limited | Real estate | 2005 |
| HET Contracting Ltd | Construction | 2019 |
| Hetfield Consultancy Limited | Professional & scientific | 2014 |
| HEX Event Solutions Limited | Administrative & support | 2018 |
| HG Commerce Ltd | Wholesale & retail | 2025 |
| HG Wood Supplies Limited | Wholesale & retail | 2025 |
| HH Tiling Tools Ltd | Wholesale & retail | 2022 |
| HH60 Consultants Ltd | Professional & scientific | 2016 |
| Higgins Drysdale Ltd | Real estate | 2019 |
| High & DRY Manufacturing Ltd | Manufacturing | 2002 |
| High Street 1959 Limited | Extraterritorial | 2014 |
| Highhouse Business Administration Limited | Information & communication | 2020 |
| Highhouse Financial Services Limited | Financial services | 2002 |
| Highhouse Money Ltd | Financial services | 2020 |
| Highland Icecream Limited | Hospitality | 2018 |
| Highwater Marine Ltd | Manufacturing | 2005 |
| Hiking Kids UK C.I.C. | Arts & recreation | 2024 |
| Hildon Property Investments Limited | Real estate | 1996 |
| Hill Brothers (Chichester) Limited | Agriculture & fishing | 1974 |
| Hill Home Renovations Ltd | Construction | 2024 |
| Hill Lawn Properties Limited | Real estate | 1989 |
| Hillbarn Golf Club Limited | Arts & recreation | 2002 |
| Hillbilly Logistics Ltd | Transport & logistics | 2026 |
| Hillfield Road Residents Association Ltd. | Real estate | 2014 |
| Hills Radio Limited | Wholesale & retail | 2008 |
| Hills-Reed Carpentry Ltd | Construction | 2025 |
| Hirange Supermarket Ltd | Wholesale & retail | 2016 |
| Hire One, Help Many Ltd | Administrative & support | 2025 |
| HIT Spices Ltd | Hospitality | 2022 |
| Hitchkick Limited | Arts & recreation | 2018 |
| Hitchkick Properties Limited | Real estate | 2026 |
| Hitnlift Ltd | Arts & recreation | 2024 |
| HL Concept Property Limited | Construction | 2025 |
| HLC Assets Limited | Households | 2022 |
| HLR Notary Limited | Professional & scientific | 2022 |
| HM Reporting Limited | Health & social care | 2023 |
| HNW Architects Limited | Professional & scientific | 1998 |
| Hoamz Ltd | Information & communication | 2025 |
| Hoar & Sons Cleaning Services Ltd | Administrative & support | 2019 |
| Hoarticulture Ltd | Agriculture & fishing | 2019 |
| HOB Holdings Ltd | Financial services | 2015 |
| Hodan Associates Ltd | Professional & scientific | 2021 |
| Hodge Installations Limited | Construction | 2002 |
| Hodgell Limited | Financial services | 2021 |
| HOE Estate Co.Limited | Households | 1957 |
| Holden & Co (West Sussex) Ltd | Professional & scientific | 2014 |
| Holdfast Fitness Ltd | Arts & recreation | 2024 |
| Holiday Horizon Ltd | Administrative & support | 2025 |
| Holiday Park Breaks Ltd | Hospitality | 2026 |
| Holistic Merchandise (UK) Ltd | Wholesale & retail | 2019 |
| Holistic Trade Mart (UK) Ltd | Wholesale & retail | 2018 |
| Hollowshock Productions Ltd | Information & communication | 2020 |