| H Brothers Properties Ltd | Real estate | 2025 |
| H J Green Investments | Financial services | 2025 |
| H K Mashers Limited | Wholesale & retail | 2025 |
| H&N Associates Ltd | Hospitality | 2025 |
| H&S Antrobus Property Investments Ltd | Real estate | 2022 |
| H&U Estates Ltd | Real estate | 2018 |
| H. M. Odell Limited | Wholesale & retail | 1980 |
| H.B MCR Limited | Hospitality | 2025 |
| H.Feld Ltd | Construction | 2021 |
| H2 Habitat Ltd | Hospitality | 2024 |
| H2 Nature Ltd | Professional & scientific | 2021 |
| H2ORIGIN Ltd | Manufacturing | 2022 |
| Haber Canvey Ltd | Real estate | 2025 |
| Haber Croydon Ltd | Real estate | 2025 |
| Haber Glenmore Limited | Real estate | 2025 |
| Haber Glenmore SUB Limited | Real estate | 2025 |
| Haber Southend Ltd | Real estate | 2025 |
| Haber Weymouth Ltd | Real estate | 2024 |
| Haber Weymouth SUB Ltd | Real estate | 2025 |
| Haberfeld Investments Ltd | Real estate | 2024 |
| Haberfeld Services Limited | Professional & scientific | 2025 |
| Hachu Ltd | Wholesale & retail | 2017 |
| Hackney Schools for the Future 2 Limited | Professional & scientific | 2015 |
| Hackney Schools for the Future Limited | Professional & scientific | 2007 |
| HAD & Co Properties Ltd | Professional & scientific | 2022 |
| HAD Group Estates Ltd | Real estate | 2019 |
| HAD Property Inspections Ltd | Real estate | 2022 |
| Hadeti Enterprise Ltd | Hospitality | 2025 |
| Hadi 786 Limited | Health & social care | 2017 |
| Hadi Capital Ltd | Real estate | 2025 |
| Hadi Interior Design Ltd | Professional & scientific | 2026 |
| Hadrian's Lover Ltd | Administrative & support | 2024 |
| Hafiz Brothers Limited | Hospitality | 2023 |
| Hagley Limited | Real estate | 2018 |
| Haide Technologies Limited | Professional & scientific | 2017 |
| Haim House Ltd | Real estate | 2025 |
| Haines Park Estates Limited | Other services | 2023 |
| Hair Master (Blackpool Road) Ltd | Other services | 2017 |
| Hair Trade (MCR) Limited | Wholesale & retail | 2023 |
| Hairat Tradings Limited | Wholesale & retail | 2024 |
| Hairlla Luxe Ltd | Wholesale & retail | 2025 |
| Halal Housing Scheme Ltd | Construction | 2023 |
| Halcombe Limited | Real estate | 1995 |
| Hale Leisure Limited | Real estate | 2019 |
| Halgh Urban Ltd | Professional & scientific | 2025 |
| Halimah Okoh Ltd | Wholesale & retail | 2026 |
| Halios Ventures Limited | Financial services | 2025 |
| Hallam Physiotherapy Ltd | Health & social care | 2021 |
| Hallgarth Administration Services Ltd | Administrative & support | 2022 |
| Hallmark Ambler Mill Ltd | Financial services | 2022 |
| Hallmark Assets (Old) Ltd | Extraterritorial | 2018 |
| Hallmark Assets Ltd | Financial services | 2022 |
| Hallmark HR Ltd | Administrative & support | 2016 |
| Hallmark Management Limited | Real estate | 2020 |
| Hallmark Management Services Ltd | Real estate | 2009 |
| Hallmark Real Estate Investments Ltd | Extraterritorial | 2018 |
| Hallmark Real Estate Management Ltd | Real estate | 2022 |
| Hallmark UK Property Limited | Real estate | 2023 |
| Halmore Investments LLP | | 2010 |
| Halo PPE Ltd | Wholesale & retail | 2020 |
| Halong Property Services Ltd | Real estate | 2011 |
| Halpert Estates Ltd | Real estate | 2025 |
| Halvergate Limited | Extraterritorial | 1995 |
| Hamaid Property Holdings Ltd | Real estate | 2025 |
| Hammond Trotter Solicitors Limited | Professional & scientific | 2011 |
| Hammyard Ltd | Wholesale & retail | 2025 |
| Hampson Hospitality Limited | Hospitality | 2025 |
| Hana Hosiery Manufacturing Co Ltd | Manufacturing | 2019 |
| Hanc Property Partnership Ltd | Real estate | 2022 |
| Hancock Property Group Limited | Real estate | 2025 |
| Hanesa Global Ltd | Wholesale & retail | 2026 |
| Hangar Pacific Limited | Wholesale & retail | 2020 |
| Hanmore Ltd | Real estate | 2018 |
| Hannah Claire March Ltd | Professional & scientific | 2022 |
| Hannah Crown Holdings Ltd | Financial services | 2023 |
| Hanover Gardens Estates Ltd | Real estate | 2018 |
| Hanover Property Consultants Ltd | Extraterritorial | 2020 |
| Happeter Limited | Administrative & support | 2018 |
| Happy Childcare Ltd | Education | 2021 |
| Happy Feet Day Nursery Limited | Education | 2015 |
| Happy Haven (MC) Ltd | Health & social care | 2024 |
| Happy Kids Childcare (NW) Ltd | Health & social care | 2026 |
| Happy Kidz R US Ltd | Health & social care | 2017 |
| Happy Motor Finance Limited | Financial services | 2022 |
| Happy Seal Ltd | Real estate | 2022 |
| Happy Shoppers (Chadderton) Limited | Wholesale & retail | 2018 |
| HAR HAR Ltd | Hospitality | 2025 |
| Harborview Haven Limited | Real estate | 2025 |
| Harford Services (UK) Ltd | Administrative & support | 2013 |
| Haris Cart Ltd | Wholesale & retail | 2025 |
| Harlow Vale Manco Limited | Households | 2026 |
| Harobed Solutions Ltd | Information & communication | 2024 |
| Harper UK Group Ltd | Construction | 2024 |
| Harpworth Limited | Extraterritorial | 2002 |
| Harrie Shoes Ltd | Wholesale & retail | 2022 |
| Harris Infrastucture Advisory Limited | Professional & scientific | 2021 |
| Hartford Mill Oldham Ltd | Construction | 2018 |
| Harthold Ltd | Real estate | 2025 |
| Hartlepool Estates Ltd | Other services | 2017 |
| Hartley & Co Properties Ltd | Real estate | 2026 |