| Handmade England Limited | Wholesale & retail | 2017 |
| Hanson & Hanson Ltd | Professional & scientific | 2024 |
| Happiness Ventures Limited | Health & social care | 2015 |
| Happy Diamonds Limited | Real estate | 2023 |
| Happy Foodbox Limited | Hospitality | 2026 |
| Happy VAC Limited | Manufacturing | 2026 |
| Happypan Limited | Hospitality | 2024 |
| Happywarm Limited | Wholesale & retail | 1992 |
| Harcott Ltd | Construction | 2017 |
| Hardwood Origin Limited | Wholesale & retail | 2019 |
| Harmmony Homes Support Services Ltd | Health & social care | 2023 |
| Harper Intelligence Ltd | Information & communication | 2025 |
| Harsa Ltd | Professional & scientific | 2025 |
| Hatton Gems Limited | Wholesale & retail | 2015 |
| Havant Chips Limited | Hospitality | 2024 |
| HB 16 Ltd | Real estate | 2023 |
| HB 16 SUB Ltd | Real estate | 2023 |
| HB 16A Ltd | Real estate | 2023 |
| HB Group Ltd | Real estate | 2022 |
| HDL Watch and Jewellery Services Limited | Manufacturing | 2016 |
| Healers Table C.I.C. | Education | 2020 |
| Healthcare Expert Ltd | Health & social care | 2019 |
| Hear Their Voices Ltd | Information & communication | 2018 |
| Heat Connect Limited | Construction | 2022 |
| Heat Pumps 4 U Limited | Manufacturing | 2024 |
| Heath Close Billericay Limited | Real estate | 2021 |
| Heili Ltd | Hospitality | 2012 |
| Heist of London Ltd | Wholesale & retail | 2018 |
| Helier Court RTM Company Limited | Households | 2004 |
| Henleaze Residents Limited | Households | 2012 |
| Henley Property Services ( Westcliff) Ltd | Construction | 2025 |
| Hexar Talent Ltd | Information & communication | 2026 |
| HHK Digital Ltd | Wholesale & retail | 2025 |
| HHL Consulting Limited | Professional & scientific | 2021 |
| HI PAO Hotpot Limited | Hospitality | 2022 |
| High Concept Films Limited | Arts & recreation | 2019 |
| High View (Surbiton) Residents Co. Limited | Households | 1968 |
| Hillford Living Ltd | Wholesale & retail | 2025 |
| Hillgrove Consulting Ltd | Professional & scientific | 2024 |
| Hiwingo Limited | Administrative & support | 2023 |
| HL Oriental House Limited | Hospitality | 2017 |
| Holland Road Management Company Limited | Households | 1989 |
| Homegym Super Store Limited | Wholesale & retail | 2025 |
| Homeseal UK Home Improvements Ltd | Transport & logistics | 2009 |
| Homestead Apparel Ltd | Wholesale & retail | 2025 |
| Homewok Chinese Ltd | Professional & scientific | 2020 |
| Honeyalmond Limited | Hospitality | 2020 |
| Hongming Ltd | Hospitality | 2020 |
| Hope Brewery Ltd | Manufacturing | 2014 |
| Hopetest Limited | | 1981 |
| Hornet Livings Limited | Hospitality | 2020 |
| Host Property Limited | Real estate | 2006 |
| Host Student Limited | Real estate | 2012 |
| Hot TUB Hire Essex Ltd | Administrative & support | 2024 |
| House of Gadgets Ltd | Wholesale & retail | 2025 |
| House of Praise Ltd | Administrative & support | 2021 |
| Huangjin Limited | Hospitality | 2018 |
| Human Art Limited | Arts & recreation | 2025 |
| Humday Estates Limited | Real estate | 2011 |
| Humday Ltd | Real estate | 2006 |
| Huntley Ventures Limited | Financial services | 2024 |
| Huxy Aviation Ltd | Professional & scientific | 2003 |
| Hyatt Capital Ltd | Real estate | 2019 |
| Hydro Sailing Limited | Manufacturing | 2012 |
| Hyperreal Films Limited | Information & communication | 2014 |
| I & N 1628 Limited | Hospitality | 2019 |
| I Care Property Ltd | Real estate | 2021 |
| I.L.I Holdings Limited | Real estate | 2017 |
| Iauk Realtors Limited | Real estate | 2023 |
| IBN Sina Labs Ltd | Health & social care | 2025 |
| IBN Sina Sanctuary Ltd | Health & social care | 2023 |
| IBN Sina Wellbeing Project CIC | Education | 2025 |
| Icarus Property Limited | Real estate | 2019 |
| ICC Consortium Limited | Mining & quarrying | 2022 |
| ID Packaging Ltd | Wholesale & retail | 2011 |
| Ideal Catering Equipment Limited | Wholesale & retail | 2011 |
| Idle Hands Music & Entertainment Ltd | Information & communication | 2025 |
| Iduna Development Co Limited | Financial services | 2022 |
| Iduna Electric Vehicle Charging Infrastructure 2 PLC | Financial services | 2021 |
| Iduna Electric Vehicle Charging Infrastructure PLC | Financial services | 2021 |
| Iduna Evci Asset Co 1 Limited | Construction | 2022 |
| Iduna Evci Holdings Limited | Financial services | 2021 |
| Iduna Infrastructure Limited | Financial services | 2020 |
| Iduna OMA Limited | Financial services | 2021 |
| Iesk Holdings Ltd | Financial services | 2023 |
| Iexpert Repairs Ltd | Wholesale & retail | 2025 |
| Ifield Botanics UK Ltd | Agriculture & fishing | 2022 |
| Ifield Chef Limited | Hospitality | 2026 |
| Ilex Close Colchester Limited | Real estate | 2021 |
| IMD Oven Cleaning Limited | Administrative & support | 2021 |
| Imperial Lodge Management Company Limited | Households | 2004 |
| In-Spraytional Ltd | Wholesale & retail | 2021 |
| Indigo Oak Ltd | Health & social care | 2023 |
| Indigodilini Properties Ltd | Real estate | 2024 |
| Ineo Consulting Limited | Information & communication | 2014 |
| Inkdome Limited | Hospitality | 2018 |
| Inked Osteo Limited | Health & social care | 2019 |
| Inno Web Ltd | Information & communication | 2019 |
| Innova Cancer Centre Ltd | Professional & scientific | 2023 |
| Inora Supply Ltd | Wholesale & retail | 2016 |