| Hiib Services Ltd | Information & communication | 2022 |
| Hijaz Productions Ltd | Other services | 2025 |
| Hijaz Publications Ltd | Information & communication | 2025 |
| Hillbuilt Services Limited | Real estate | 2013 |
| Hillcrest Management(St-Albans)Limited | Households | 1972 |
| Hillcrest Services (Grays) Limited | Real estate | 2012 |
| Hillcroft Business Advisory Ltd | Professional & scientific | 2026 |
| Hillcroft Electrical Limited | Construction | 2018 |
| Hillier Hopkins Accountants Limited | Professional & scientific | 2022 |
| Hillier Hopkins Accounting Limited | Professional & scientific | 2023 |
| Hillier Hopkins Bookkeeping Solutions Limited | Professional & scientific | 2016 |
| Hillier Hopkins Executors Limited | Extraterritorial | 2020 |
| Hillier Hopkins Group Holdings Limited | Extraterritorial | 2022 |
| Hillier Hopkins Group Limited | Professional & scientific | 2005 |
| Hillier Hopkins Legal & Accounting Limited | Professional & scientific | 2004 |
| Hillier Hopkins LLP | | 2003 |
| Hillier Hopkins Probate and Estate Administration Services Limited | Extraterritorial | 2020 |
| Hillier Hopkins Trust Corporation Limited | Administrative & support | 2020 |
| Hills Physical Developments Ltd | Other services | 2013 |
| Hillside Real Estate Ltd | Real estate | 2006 |
| Hilltop Management Consultancy Ltd | Administrative & support | 2016 |
| Hilton Finance (UK) Limited | Administrative & support | 1999 |
| Hilton HHC Limited | Professional & scientific | 2006 |
| Hilton HIH Limited | Financial services | 2006 |
| Hilton International Entities Holding Limited | Financial services | 2018 |
| Hilton International Hotels (UK) Limited | Hospitality | 1961 |
| Hilton International IP Holding 2 Limited | Hospitality | 2016 |
| Hilton International IP Holding Limited | Hospitality | 2016 |
| Hilton International Master Holding Limited | Financial services | 2018 |
| Hilton King & Locke Limited | Real estate | 2007 |
| Hilton UK Corporate Director Limited | Professional & scientific | 1960 |
| Hilton UK Foundation | Other services | 2021 |
| Hilton UK Hotels Limited | Hospitality | 1904 |
| Hilton UK Madison Square Limited | Hospitality | 2024 |
| Hilton UK Manage Limited | Hospitality | 2007 |
| Hilton UK Pension Trustee Limited | Professional & scientific | 2005 |
| Hilton Worldwide Franchising LP | | 2014 |
| Hilton Worldwide FS Treasury Limited | Administrative & support | 2014 |
| Hilton Worldwide Holding 1 Limited | Hospitality | 2014 |
| Hilton Worldwide Holding 2 Limited | Hospitality | 2014 |
| Hilton Worldwide Holding LLP | | 2014 |
| Hilton Worldwide Manage Branchco Limited | Hospitality | 2014 |
| Hilton Worldwide Manage Limited | Hospitality | 2010 |
| Hilton Worldwide Services Limited | Hospitality | 2010 |
| Himalayan Organic Pink Salt Ltd | Wholesale & retail | 2023 |
| Himalayan Salt Ltd. | Professional & scientific | 2017 |
| Himaya Properties LLP | | 2023 |
| Himw Ltd | Information & communication | 2018 |
| Hina S Creative Ltd | Arts & recreation | 2021 |
| Hindes Road Management Limited | Households | 2006 |
| Hindistars Tuition & Translations Limited | Professional & scientific | 2020 |
| Hindu Priest Services Limited | Other services | 2013 |
| Hindwoods International Limited | Financial services | 2025 |
| Hinok Ltd | Professional & scientific | 2023 |
| Hint Hint Limited | Information & communication | 2014 |
| Hintons Pharmacy Limited | Wholesale & retail | 2004 |
| Hipaaline Ltd | Information & communication | 2020 |
| Hiqma Limited | Professional & scientific | 2021 |
| Hire Technicians Group Limited | Manufacturing | 2023 |
| Hirent Ltd | Real estate | 2018 |
| Hireqube Ltd | Administrative & support | 2025 |
| Hirsch Services Limited | Professional & scientific | 2020 |
| Hirva Bhanu Foods Ltd | Wholesale & retail | 2026 |
| Hishtom Solutions Limited | Information & communication | 2012 |
| Hitan Ltd | Real estate | 2022 |
| Hitches & Glitches Ltd | Construction | 2021 |
| Hitchin 16 Limited | Construction | 2013 |
| HJ Automotive Ltd | Wholesale & retail | 2025 |
| HJ Partners Limited | Professional & scientific | 2020 |
| HJD Services Ltd | Construction | 2024 |
| HJP Properties Limited | Construction | 2018 |
| HK Beauty Limited | Other services | 2018 |
| HK Kaisen Ltd | Hospitality | 2025 |
| HK Property Group Limited | Households | 2024 |
| HK Supermarket Ltd | Wholesale & retail | 2018 |
| Hkers United Limited | Hospitality | 2022 |
| HLT ARO Manage Limited | Hospitality | 2007 |
| HLT London Manage Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-A Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-B Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-C Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-D Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-E Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-F Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-G Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-H Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-I Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-J Limited | Hospitality | 2007 |
| HLT Operating Mezz Vii-K Limited | Hospitality | 2007 |
| HLT Secretary Limited | Administrative & support | 2007 |
| HLT Stakis IP Limited | Hospitality | 2007 |
| HLT Stakis Operator Limited | Hospitality | 2007 |
| HM & Co Logistics Ltd | Transport & logistics | 2025 |
| HM Dynamics Ltd | Professional & scientific | 2019 |
| HM Healthcare Solutions Ltd | Professional & scientific | 2015 |
| HM UK Consulting Ltd | Professional & scientific | 2018 |
| Hmaf Holdings (UK) Limited | Financial services | 2020 |
| HMB Homes Ltd | Real estate | 2020 |
| HMD Advisors Ltd | Professional & scientific | 2022 |
| HMI Capital Ltd | Real estate | 2025 |