| Halls Property Company Limited | Real estate | 2008 |
| Halon and Refrigerant Services Limited | Manufacturing | 1991 |
| Hamzah Construction Limited | Construction | 2026 |
| Hand Lettings Ltd | Real estate | 2025 |
| Hannaman Group Limited | Financial services | 2013 |
| Hannaman Material Handling Limited | Administrative & support | 1975 |
| Hardman Healey Limited | Other services | 2013 |
| Hardy Chatbots Ltd | Information & communication | 2025 |
| Harris Engineering Consultants Limited | Professional & scientific | 2016 |
| Haus Interiors Ltd | Professional & scientific | 2017 |
| Haus of Scent Ltd | Wholesale & retail | 2024 |
| Havana Hawk Ltd | Hospitality | 2019 |
| Havana Supreme Cigars Limited | Wholesale & retail | 2021 |
| Hawarden Accounting Limited | Professional & scientific | 2019 |
| Hawarden BEE Sanctuary Community Interest Company | Professional & scientific | 2023 |
| Hawarden Happy Hounds Limited | Agriculture & fishing | 2023 |
| Hawarden Local Store Ltd | Wholesale & retail | 2025 |
| Hawarden Masonic Hall Limited | Other services | 1963 |
| Hawarden Property Investments LLP | | 2004 |
| Hawarden Village Store Ltd | Wholesale & retail | 2019 |
| Haywoods Property Consultancy Ltd | Real estate | 2020 |
| Hazel Park Management Company Limited | Households | 2023 |
| Hazelwood Haynes Consulting Ltd | Information & communication | 2025 |
| HB Marketing Consultancy Ltd | Professional & scientific | 2025 |
| HBA U.K. Limited | Professional & scientific | 1998 |
| Heatcentric Ltd | Construction | 2021 |
| Helter Propco Limited | Professional & scientific | 2021 |
| Henry R. Davis & Co Limited | Professional & scientific | 2011 |
| Here & NOW Retail Limited | Wholesale & retail | 2022 |
| Hero Property Asset Management Limited | Hospitality | 2025 |
| Hewitt Property Rentals Limited | Real estate | 2023 |
| Hexham Court (Jesmond Road) Management Company Limited | Real estate | 1992 |
| Hi-Tech Turf Limited | Administrative & support | 2011 |
| Hianas Ltd | Construction | 2013 |
| Hilbury Limited | Wholesale & retail | 2015 |
| History Pulse Ltd | Other services | 2023 |
| HJH Commercial Consultants Ltd | Construction | 2021 |
| HMB Enterprise Ltd | Wholesale & retail | 2015 |
| HMO Go Ltd | Construction | 2023 |
| Holloway Mortgage Solutions Limited | Financial services | 2026 |
| Holmwood Limited | Wholesale & retail | 2004 |
| Home Improvement Plus Limited | Construction | 2017 |
| Home Toys & Beauty Limited | Wholesale & retail | 2019 |
| Hongfa 7080 Limited | Hospitality | 2026 |
| Hope Properties NW Limited | Real estate | 2017 |
| Horizon Blinds Limited | Other services | 2004 |
| Horizon Global European Holdings Limited | Financial services | 2013 |
| Horus FM Limited | Administrative & support | 2025 |
| Hospitality Planet Ltd | Hospitality | 2025 |
| Hot and Cold Heating and Plumbing Chester Ltd | Construction | 2026 |
| Hot Stuff Shunxing Ltd | Hospitality | 2024 |
| House of Olive Ltd | Wholesale & retail | 2025 |
| Howell Stunts Ltd | Arts & recreation | 2015 |
| HSB Renewable Energy Ltd | Construction | 2021 |
| Hunt & Perrin Limited | Professional & scientific | 2021 |
| Hutcheon Construction Limited | Construction | 2005 |
| Hutcheon Holdings Limited | Financial services | 2016 |
| Huxley Partners Limited | Professional & scientific | 2026 |
| HWB Clinic Hawarden Limited | Other services | 2024 |
| Hynesco Plumbing Ltd | Construction | 2023 |
| I & CA Holdings Ltd | Real estate | 2022 |
| I AM NOT a Robot Ltd | Professional & scientific | 2015 |
| I-Kew Sports Limited | Arts & recreation | 2022 |
| I.R.M. Carpets Ltd | Wholesale & retail | 2005 |
| Icam H&P Limited | Construction | 2021 |
| Ice and Easy Ltd | Manufacturing | 2005 |
| Iceland Acquico Limited | Professional & scientific | 2012 |
| Iceland Bondco PLC | Professional & scientific | 2014 |
| Iceland Foods Employee Lottery Limited | Arts & recreation | 2023 |
| Iceland Foods Employees Christmas Savings Limited | Professional & scientific | 2017 |
| Iceland Foods Group Limited | Professional & scientific | 2007 |
| Iceland Foods Limited | Wholesale & retail | 1973 |
| Iceland Frozen Foods Limited | Professional & scientific | 1996 |
| Iceland International Distribution Limited | Transport & logistics | 2021 |
| Iceland Limited | Professional & scientific | 1973 |
| Iceland Manufacturing Limited | Wholesale & retail | 2020 |
| Iceland Overseas Limited | Extraterritorial | 1991 |
| Iceland Vlnco Limited | Professional & scientific | 2012 |
| Idaltu Limited | Information & communication | 2020 |
| Identipack Ltd | Wholesale & retail | 2024 |
| Igralec Limited | Transport & logistics | 2014 |
| IH Avtech Limited | Manufacturing | 2021 |
| IK Pro Limited | Administrative & support | 2025 |
| Ilanimation Studios Limited | Professional & scientific | 2013 |
| Illustrious Plumbing & Heating Ltd | Construction | 2014 |
| Independent Fire Advisers Limited | Professional & scientific | 2003 |
| Indie Bubble Studio Ltd | Professional & scientific | 2022 |
| Individual Restaurants (IRC) Limited | Hospitality | 2004 |
| Industrie Cartarie Tronchetti UK Limited | Manufacturing | 2018 |
| Iner Property Ltd | Real estate | 2025 |
| Infinity Worldwide Ltd | Wholesale & retail | 2018 |
| Innervision Life Coaching Ltd | Health & social care | 2023 |
| Inspired Healthcare Consultancy Ltd | Health & social care | 2014 |
| Integral Health (Shropshire) Limited | Health & social care | 2013 |
| Intuition Strategic Consulting Ltd | Professional & scientific | 2021 |
| IRC Cucina Limited | Wholesale & retail | 2020 |
| Ironbridge & Sons Ltd | Wholesale & retail | 2015 |
| IV Service Ltd | Professional & scientific | 2009 |
| J & B Lettings Ltd | Real estate | 2025 |
| J & P Engineering Services Ltd | Administrative & support | 2003 |