| Hollynook Designs Limited | Manufacturing | 2013 |
| Holy Moly Mexican Limited | Hospitality | 2016 |
| Home Farm Equine Limited | Professional & scientific | 2012 |
| Home-Start Newark | Health & social care | 2005 |
| Homefield Close Limited | Construction | 2002 |
| Homwe Limited | Households | 2022 |
| Honey Rose Weddings & Events Ltd | Hospitality | 2022 |
| Honeypot Energy Limited | Agriculture & fishing | 2014 |
| Hope House (Lineside) Ltd | Agriculture & fishing | 2024 |
| Hope Springs Horticulture Community Interest Company | Health & social care | 2012 |
| Hope to Talk to YOU Limited | Education | 2021 |
| Horizon (Birmingham) Management Company Limited | Households | 2015 |
| Hornes House Clearance Limited | Transport & logistics | 2023 |
| Hornes Removals Ltd | Transport & logistics | 2015 |
| Hornes Storage Ltd | Transport & logistics | 2015 |
| Horse and Human Limited | Agriculture & fishing | 2023 |
| Horseboxservices Limited | Manufacturing | 2013 |
| Horsman Developments Ltd | Construction | 2018 |
| Horspool Retreat Ltd | Hospitality | 2015 |
| Hosting Developments Limited | Professional & scientific | 2007 |
| Hotbox Gym & Cafe Ltd | Arts & recreation | 2024 |
| Hotelrez Limited | Administrative & support | 2004 |
| House Business Consultants Ltd | Other services | 2014 |
| House of Jordan Limited | Manufacturing | 1972 |
| Housing and Support Solutions Limited | Hospitality | 2002 |
| Hoyland Rural Limited | Administrative & support | 2005 |
| HQ Innovations Ltd | Real estate | 2024 |
| HS Real Estate Group Ltd | Real estate | 2025 |
| Hsenvironment & Risk Management Ltd. | Financial services | 2015 |
| HSH Services Ltd | Professional & scientific | 2017 |
| Hspb Livery Ltd | Real estate | 2019 |
| HST Consultancy Ltd | Professional & scientific | 2025 |
| HT Nails 50 Ltd | Other services | 2024 |
| HTV Holdings 28 Limited | Construction | 2024 |
| Huang Kitchen Ltd | Hospitality | 2024 |
| Hucksters Firepot Limited | Arts & recreation | 2009 |
| Huddart Developments Limited | Construction | 2019 |
| Hudson Heritage Limited | Construction | 2008 |
| Hudson Plant Ltd | Construction | 2015 |
| Huedo Sunsets Technical Services Ltd | Professional & scientific | 2025 |
| Humberstone Leasing Ltd | Real estate | 2025 |
| Hunter Global Business Solutions Ltd | Administrative & support | 2018 |
| Huntingdon House Estates Limited | Real estate | 2013 |
| Huntingdon House Management Company Limited | Real estate | 2012 |
| Hurley & Gray Social Work Consultancy Ltd | Health & social care | 2018 |
| Hutchinson Engineering Group Limited | Financial services | 2020 |
| Hutchinson Engineering Services Limited | Wholesale & retail | 1990 |
| HV Associates Limited | Wholesale & retail | 2023 |
| Hvac Wholesale Limited | Wholesale & retail | 2022 |
| HW Labs Ltd | Wholesale & retail | 2024 |
| Hy-Acc Services Limited | Manufacturing | 2017 |
| Hydrepair Hydraulic Engineering Ltd | Professional & scientific | 2025 |
| Hymas Consulting Services Limited | Professional & scientific | 2019 |
| Hypr Global Ltd | Wholesale & retail | 2025 |
| I B Landscaping Ltd | Construction | 2019 |
| I P Lifting Ltd | Construction | 2018 |
| I.M.S. Joinery Services Limited | Construction | 2003 |
| I8 Group Limited | Information & communication | 2015 |
| IAN Sheldon Plumbing Services Ltd | Construction | 2017 |
| IAN Shipley Grave Diggers Limited | Other services | 2003 |
| IB Cars & Valeting Ltd | Wholesale & retail | 2016 |
| Ibcal Limited | Real estate | 2013 |
| Iberswitch Limited | Other services | 2016 |
| Icarus Solar Park Limited | Energy | 2026 |
| Ice Agency Sales Ltd | Professional & scientific | 2024 |
| Icecool Hot Spots Limited | Information & communication | 2022 |
| Icon Motor Cycles Limited | Manufacturing | 2026 |
| ICONF1 Limited | Manufacturing | 2011 |
| Idea WIZ Ltd | Professional & scientific | 2015 |
| Ideal Envelopes Limited | Wholesale & retail | 2007 |
| Ideas Network UK Community Interest Company | Administrative & support | 2015 |
| Idlehour Group Limited | Professional & scientific | 2023 |
| IF IT IS Limited | Information & communication | 2018 |
| IF NOT NOW Then When Ltd | Administrative & support | 2025 |
| Ignite Plumbing and Heating Solutions Ltd | Construction | 2013 |
| IHD Professional Ltd | Wholesale & retail | 2019 |
| IJK Interiors Limited | Administrative & support | 2011 |
| IKB Contracts Limited | Construction | 2015 |
| Ilkeston Tractor Repairs Ltd | Manufacturing | 2014 |
| Illuminate Group Limited | Information & communication | 2014 |
| Imageorder Services Ltd | Information & communication | 2017 |
| Imageskool Limited | Information & communication | 2007 |
| Imperial Home Improvement Ltd | Construction | 2014 |
| Impetus Events Limited | Administrative & support | 2021 |
| IN2REHAB Brands Limited | Wholesale & retail | 2009 |
| Independent Production Company Limited | Information & communication | 2014 |
| Indigo Surveys Notts Ltd | Professional & scientific | 2023 |
| Indigobee Academy CIC | Education | 2024 |
| Indijs & AMY Ltd | Transport & logistics | 2016 |
| Infinitas Design Ltd | Professional & scientific | 2014 |
| Infinite Controls Limited | Professional & scientific | 2019 |
| Infinite Journeys Ltd | Administrative & support | 2025 |
| Influence Landscape Planning and Design Ltd | Professional & scientific | 2008 |
| Infrastructure:Solutions (EM) Ltd | Professional & scientific | 2021 |
| Ingram Drafting Services Limited | Professional & scientific | 1989 |
| Iniss Limited | Construction | 2021 |
| Initium Education Ltd | Education | 2024 |
| Inkersall Investments Limited | Real estate | 1973 |
| Inkle World Ltd | Wholesale & retail | 2016 |
| Inknotts Ltd | Wholesale & retail | 2023 |