| Hibernate Studios Ltd | Information & communication | 2024 |
| Hickstead Estates Limited | Real estate | 1972 |
| High Level Window Cleaning Ltd | Administrative & support | 2025 |
| High Performance Roofing Solutions Ltd | Construction | 2025 |
| High Pines Residents Association Limited | Households | 1963 |
| High Salvington Hub Ltd | Wholesale & retail | 2020 |
| High Salvington Mill Trust Limited | Arts & recreation | 2001 |
| High Tide Development Limited | Information & communication | 2012 |
| High Tide Films Ltd | Information & communication | 2014 |
| High-End Painting and Decorating Ltd | Construction | 2023 |
| Highden Equine Limited | Agriculture & fishing | 2017 |
| Highdown Carpentry Limited | Manufacturing | 2024 |
| Highdown Centre | Arts & recreation | 1999 |
| Highdown Garden Centre Limited | Wholesale & retail | 2019 |
| Highdown Properties Limited | Real estate | 1986 |
| Highdown Tearooms Limited | Hospitality | 2018 |
| Highfield Works Ltd | Professional & scientific | 2017 |
| Highgrove House Carehome Limited | Health & social care | 2017 |
| Highway Design Consulting Limited | Professional & scientific | 1999 |
| Hijenx Limited | Professional & scientific | 2024 |
| Hiketeria Ltd | Hospitality | 2022 |
| Hilary Clark Design Consultancy Limited | Professional & scientific | 2023 |
| Hillier Property Developments Limited | Construction | 2017 |
| Hills Asset Management Ltd | Real estate | 2025 |
| Hills Eyewear Ltd | Administrative & support | 2025 |
| Hills of Bramley Limited | Wholesale & retail | 2003 |
| Himelink Limited | Transport & logistics | 1999 |
| Hinley Hanley Studios Limited | Wholesale & retail | 2026 |
| Hire 2000 (Sales) Limited | Professional & scientific | 1999 |
| Hirsch Organic Ltd | Manufacturing | 2018 |
| Hisar Property Investment Ltd | Real estate | 2017 |
| History People UK Limited | Administrative & support | 2009 |
| Hitchit Group Limited | Wholesale & retail | 2024 |
| HJ Creative Limited | Information & communication | 2022 |
| Hjcsheridan Marketing Limited | Professional & scientific | 2022 |
| Hjdoogan Limited | Information & communication | 2019 |
| Hjhasia Ltd | Hospitality | 2026 |
| HL Catering Ltd | Hospitality | 2025 |
| HML Consultants Limited | Professional & scientific | 2019 |
| HML Properties Ltd | Real estate | 2007 |
| Hnybdgr TTT Limited | Other services | 2022 |
| HOD Publishing Ltd | Information & communication | 2026 |
| Hodges and Lings Law Limited | Professional & scientific | 2016 |
| Hodzi Logistics Limited | Transport & logistics | 2025 |
| Hold Investments Limited | Real estate | 2005 |
| Holdco 66 Limited | Financial services | 2025 |
| Holdco ABL Limited | Financial services | 2022 |
| Holdco MAL Limited | Financial services | 2022 |
| Holdco NEP Limited | Financial services | 2022 |
| Holiday Park Specialists Limited | Other services | 2019 |
| Holly Gabrielle Limited | Information & communication | 2021 |
| Hollyacre Plants Limited | Wholesale & retail | 1988 |
| Hollyhocks (Holiday Lets) Limited | Real estate | 2020 |
| Hollyhocksferring Limited | Households | 2011 |
| Hollymead House Holdings Limited | Health & social care | 2012 |
| Hollymead House Limited | Health & social care | 2012 |
| Holy Tree LLP | | 2023 |
| Homa Travel Ltd | Administrative & support | 2022 |
| Home Digital Care Limited | Information & communication | 2014 |
| Home Farm Regenerative Ltd | Real estate | 2022 |
| Home Guarantee Ltd | Real estate | 2017 |
| Home Guard Mews Management Ltd | Real estate | 2018 |
| Home Payments Ltd | Administrative & support | 2018 |
| Homecare Membership Services Sussex Limited | Information & communication | 2014 |
| Homes by DTM Ltd | Construction | 2021 |
| Homewise Limited | Real estate | 2001 |
| Homewise Properties Limited | Real estate | 2017 |
| Hooly Ltd | Professional & scientific | 2018 |
| Hoot Financial Ltd | Professional & scientific | 2015 |
| Hopegar Holdings Limited | Professional & scientific | 1998 |
| Hopegar Properties Limited | Real estate | 1949 |
| Horizon Design Limited | Professional & scientific | 2007 |
| Horn Inns Ltd | Hospitality | 2025 |
| Hornbrook 001 Ltd | Financial services | 2021 |
| Hornbrook 002 Ltd | Financial services | 2021 |
| Hornbrook 003 Ltd | Financial services | 2021 |
| Hornbrook Developments LLP | | 2021 |
| Hornbrook Holdings a LLP | | 2021 |
| Horndon Services Limited | Construction | 2016 |
| Horsham Roofing Limited | Construction | 2026 |
| Horsham Swim School Limited | Education | 2017 |
| Horton Property Investments Limited | Real estate | 2018 |
| Hospitality People Limited | Administrative & support | 2020 |
| Hot Copper PUB Company Limited | Hospitality | 2015 |
| Hot Desk Media Limited | Administrative & support | 2024 |
| Hot Love Limited | Wholesale & retail | 2026 |
| Hot Ombre Cosmetics International Ltd | Wholesale & retail | 2019 |
| Hot Spot (South Coast) Limited | Hospitality | 2010 |
| Hotdog Deckchair Limited | Other services | 2017 |
| Hotpod Yoga Worthing Limited | Arts & recreation | 2017 |
| Houghton Electrical Services Limited | Construction | 2007 |
| Hound House Hydro Limited | Other services | 2019 |
| Houndeanreno Ltd | Extraterritorial | 2026 |
| Hourbike Limited | Professional & scientific | 2007 |
| House Beach Bracks Limited | Real estate | 2026 |
| House of Caro Limited | Wholesale & retail | 2022 |
| House of Docs Ltd | Information & communication | 2026 |
| House of Jacob David LLP | | 2020 |
| House of Longley Ltd | Information & communication | 2024 |
| House Spice Ltd | Hospitality | 2026 |