| Habitat Designs & Planning Limited | Professional & scientific | 2022 |
| Haddington Wells Capital Ltd | Transport & logistics | 2025 |
| Hair by Becca Ltd | Wholesale & retail | 2024 |
| Hairapps Ltd | Information & communication | 2023 |
| Halcyon Holiday Homes Ltd | Hospitality | 2023 |
| Hamad Estates Ltd | Information & communication | 2024 |
| HAN Interactive Limited | Information & communication | 2010 |
| Handsonpmo Ltd | Information & communication | 2026 |
| Handy Chris Plus Ltd | Construction | 2011 |
| Hanifa Limited | Education | 2025 |
| Hanim Limited | Other services | 2012 |
| Hanta Associates Limited | Professional & scientific | 2007 |
| Hanta Consultancy Services Ltd | Information & communication | 2018 |
| Hanta Enterprises Limited | Professional & scientific | 2007 |
| Happy Hood Catering Ltd | Hospitality | 2025 |
| Happyhome Services Surrey Ltd | Administrative & support | 2025 |
| Harbour & Field Wholesale Limited | Wholesale & retail | 2026 |
| Harby Browe Management Company Limited | Households | 1992 |
| Harmony One Ltd | Real estate | 2025 |
| Harris Brothers Landscaping Ltd. | Administrative & support | 2019 |
| Harry MAC Estates Ltd | Real estate | 2025 |
| Harvest Advisory Ltd | Professional & scientific | 2022 |
| HAS Kebabs 52 Ltd | Hospitality | 2023 |
| Hasan Hairdressing Ltd | Other services | 2023 |
| Headline Overseas Ltd | Households | 2018 |
| Hearing Care Co Ltd | Health & social care | 2022 |
| Heir Generation Limited | Other services | 2016 |
| Hello Tours Limited | Administrative & support | 2011 |
| Helmar Consultancy Limited | Professional & scientific | 2012 |
| HELP4UKRAINE (Humanitarian AID) Limited | Health & social care | 2022 |
| Herts and London Minicabs Limited Limited | Transport & logistics | 2018 |
| Hierro Services Ltd | Other services | 2016 |
| Hinglaj Management Limited | Construction | 2023 |
| Hitiplex Limited | Wholesale & retail | 2019 |
| Hjcs Property Ltd | Real estate | 2025 |
| HMS Solutions Limited | Wholesale & retail | 2025 |
| Holders Apps Ltd | Information & communication | 2025 |
| Home Decor by US Limited | Professional & scientific | 2021 |
| Home First Ventures Ltd | Real estate | 2016 |
| Home Home Ltd | Real estate | 2025 |
| Home in Properties Ltd | Real estate | 2024 |
| Homeplus Management Ltd | Real estate | 2010 |
| Hometrace Limited | Real estate | 2023 |
| Honeysuckle Court Freehold Limited | Real estate | 2013 |
| Horhe Limited | Transport & logistics | 2020 |
| Horley Hotels Staffing Solutions Ltd | Administrative & support | 2022 |
| Horton Carpentry Limited | Construction | 2006 |
| Hot Desk Solutions Ltd | Professional & scientific | 2016 |
| Hot Dog and Shawarma Company Ltd | Hospitality | 2020 |
| Hot Shot Properties Limited | Real estate | 1994 |
| Hotel and Industrial Cleaning Limited | Extraterritorial | 2009 |
| Hotel Gadget Limited | Professional & scientific | 2025 |
| House Helpers Limited | Administrative & support | 2020 |
| House of Horsepower Limited | Wholesale & retail | 2016 |
| Houta Trading & Marketing Co. Ltd | Wholesale & retail | 2022 |
| HR Civil Engineering Limited | Administrative & support | 2002 |
| HS Gardens Ltd | Administrative & support | 2025 |
| HSM a Holdings Ltd | Wholesale & retail | 2022 |
| Huceste Limited | Hospitality | 2025 |
| Hummingbird House Therapies Ltd. | Health & social care | 2018 |
| Hutchison Properties Development Limited | Real estate | 2022 |
| Hyan Limited | Wholesale & retail | 2024 |
| I C Ferreira Transport Ltd | Administrative & support | 2020 |
| I.T.S.C. Limited | Construction | 2018 |
| IAC Cooling Ltd | Manufacturing | 2015 |
| Iarivu Ltd | Hospitality | 2023 |
| ICM Training & Consulting Limited | Professional & scientific | 2013 |
| Icym Ltd | Information & communication | 2022 |
| Idealism Limited | Wholesale & retail | 2016 |
| IL Capri Ltd | Hospitality | 2026 |
| Ileo Trading Co. Ltd | Real estate | 2018 |
| Ilimar Limited | Information & communication | 2016 |
| Illxi Ltd | Information & communication | 2026 |
| IMA Heating Solutions Ltd | Construction | 2018 |
| Image Brows Ltd | Other services | 2020 |
| Immigration Secure Ltd | Administrative & support | 2012 |
| Impel Companies Ltd | Administrative & support | 2023 |
| Impel Talent Ltd | Administrative & support | 2019 |
| Impel Ventures Ltd | Administrative & support | 2023 |
| Inch Muraba Technical Services Ltd | Wholesale & retail | 2023 |
| Infinite Digits Limited | Information & communication | 2024 |
| Infovise Tech PVT Ltd | Information & communication | 2026 |
| INK Generation Tattoo Limited | Arts & recreation | 2022 |
| Inka Concepts Ltd | Real estate | 2021 |
| Inline Space Ltd | Construction | 2016 |
| Innerspace (GB) Limited | Wholesale & retail | 2004 |
| Inside London Ltd | Wholesale & retail | 2022 |
| Inspired Sports Management Ltd | Education | 2013 |
| Instant Media Solution Ltd | Information & communication | 2025 |
| Insurevation AI Ltd | Information & communication | 2025 |
| Integrated Care Consulting Ltd | Extraterritorial | 2023 |
| Integrity Events Limited | Construction | 2018 |
| Intel Assets Ltd | Real estate | 2024 |
| Intelleti Ltd | Professional & scientific | 2025 |
| Intelligent Data Transform Ltd | Information & communication | 2021 |
| International Data Engineers, Scientists and Analysts (Idesa) Ltd | Information & communication | 2020 |
| Into-Shop Limited | Wholesale & retail | 2017 |
| Investnomic Ltd | Households | 2019 |
| Iringe Ltd. | Arts & recreation | 2024 |
| Iseli Ltd | Arts & recreation | 2019 |