| HRS Consulting Limited | Professional & scientific | 2008 |
| HRV Enterprises Limited | Construction | 2014 |
| HRV Group Limited | Financial services | 2021 |
| HST Logistics Limited | Agriculture & fishing | 2024 |
| HT Solutions (Global) Limited | Administrative & support | 2014 |
| Huafei Co Ltd | Wholesale & retail | 2015 |
| Hubois Limited | Arts & recreation | 2018 |
| Hudswell Hostel @ ST Michaels Limited | Hospitality | 2020 |
| Hugabuybaby Limited | Wholesale & retail | 2020 |
| Huge Creative Workshop Ltd | Professional & scientific | 2022 |
| Hughes Property Partners Limited | Hospitality | 2020 |
| Hugo James Recruitment Limited | Administrative & support | 2020 |
| Hulk Haulage Ltd | Transport & logistics | 2024 |
| Hungry Internet Marketing Ltd | Professional & scientific | 2011 |
| Hunneebee Limited | Wholesale & retail | 2022 |
| Hunt Innovations Ltd | Financial services | 2017 |
| Hunter Collections Limited | Other services | 2017 |
| Hunter Corporation Limited | Construction | 2021 |
| Hunton & Garget (N Yorks) Limited | Professional & scientific | 2017 |
| Hunton & Garget LLP | | 2011 |
| Hushed Tones Limited | Extraterritorial | 1985 |
| Hutte Limited | Professional & scientific | 2014 |
| Hutton Hall Farms Limited | Agriculture & fishing | 2011 |
| Hutton Hall Turbines Limited | Energy | 2015 |
| Huumun Group Ltd | Information & communication | 2015 |
| Huumun Ltd | Information & communication | 2002 |
| HVN Nails Ltd | Other services | 2025 |
| HWJ Consulting Limited | Professional & scientific | 2014 |
| Hybrid Engineering Ltd | Professional & scientific | 2024 |
| Hybrid Health and Rehab Ltd | Health & social care | 2022 |
| Hydra Human Resources Ltd | Professional & scientific | 2012 |
| Hyfan Resources Limited | Wholesale & retail | 2020 |
| Hype Hoarders Limited | Wholesale & retail | 2021 |
| Hypertunnel IP Limited | Administrative & support | 2020 |
| Hysa Holdings Ltd | Other services | 2025 |
| Hysa Subco 1 Ltd | Financial services | 2025 |
| Hysa Topco Ltd | Financial services | 2025 |
| I & N Properties Limited | Real estate | 2010 |
| I Doughty Limited | Construction | 2007 |
| I EAT ALL the Time Limited | Real estate | 2026 |
| I GOT Code Ltd | Information & communication | 2026 |
| I&E Professionals Ltd | Administrative & support | 2012 |
| IA Solicitors Ltd | Professional & scientific | 2024 |
| IAN Blair Limited | Other services | 2014 |
| IAN C Humphries Limited | Arts & recreation | 2014 |
| IAN Read Design Ltd | Professional & scientific | 2015 |
| IAN Roscoe Garden Services Ltd | Administrative & support | 2013 |
| IAS Financial Planning Limited | Financial services | 2013 |
| Ice Design & Build Limited | Construction | 2013 |
| Ice House Ltd | Hospitality | 2014 |
| Iceband UK Limited | Extraterritorial | 2026 |
| ICN London Ltd | Professional & scientific | 2018 |
| ICR Research Limited | Professional & scientific | 2019 |
| ICR UK Limited | Information & communication | 2006 |
| ID Universal Ltd | Information & communication | 2025 |
| Ideovate Limited | Professional & scientific | 2017 |
| Idstudio Web Design Ltd | Information & communication | 2023 |
| IG GAS Services Limited | Wholesale & retail | 2002 |
| IGM Logistics Ltd | Transport & logistics | 2024 |
| Ignis Solutions Limited | Professional & scientific | 2017 |
| Ignite& Ltd | Professional & scientific | 2020 |
| Ignovis Energy Efficiency Limited | Professional & scientific | 2016 |
| Ignovis Group Limited | Professional & scientific | 2016 |
| Ignovis Limited | Construction | 2016 |
| IGV Maintenance Ltd | Manufacturing | 2019 |
| Iiar Limited | Professional & scientific | 2023 |
| Ikarus Capital Advisory Limited | Financial services | 2016 |
| ILI Build Limited | Construction | 2020 |
| Iliah Motors Ltd | Wholesale & retail | 2010 |
| Iljeet Food & Wine Ltd | Wholesale & retail | 2015 |
| Imagine Cruising Limited | Administrative & support | 2009 |
| Imagine Enterprises Limited | Professional & scientific | 2009 |
| Imagine Holidays Limited | Administrative & support | 2021 |
| Imagine Transport Limited | Transport & logistics | 2015 |
| Iman Consultancy Limited | Health & social care | 2026 |
| Imbali Consulting Services Ltd | Professional & scientific | 2018 |
| Imbrah TM Ltd | Construction | 2024 |
| IMJ HR Consultancy Ltd | Professional & scientific | 2019 |
| Immigration Law Specialists Associates Limited | Professional & scientific | 2012 |
| Impact EOD Services Ltd | Professional & scientific | 2024 |
| Impact Investment Consultants Limited | Administrative & support | 2015 |
| Impact Sports Limited | Professional & scientific | 2019 |
| Impact Supply Solutions Ltd | Wholesale & retail | 2008 |
| Imperial Health MW Limited | Health & social care | 2014 |
| Imperial Trading Limited | Information & communication | 1989 |
| Imperium (L) Limited | Information & communication | 2025 |
| IN Black INK Ltd | Arts & recreation | 2022 |
| IN Mind Psychology Ltd | Education | 2018 |
| IN-2-ACT Limited | Professional & scientific | 2025 |
| In-Co.Mpany Limited | Information & communication | 2022 |
| In-Tune Limited | Information & communication | 1992 |
| Inaha Ltd | Health & social care | 2025 |
| Incredicorp Limited | Real estate | 2018 |
| Indesign Bathrooms Limited | Wholesale & retail | 2012 |
| India & Olivia Limited | Administrative & support | 2016 |
| India Travel Service Limited | Administrative & support | 1994 |
| Indigo Rights Limited | Professional & scientific | 2021 |
| Indubhan Properties Limited | Construction | 2021 |
| Infinite Land Holdings Limited | Real estate | 2022 |
| Infinity Blossom Ltd | Hospitality | 2022 |