| Hatfield Shaw & Co Limited | Real estate | 2026 |
| Haus of Pups Limited | Wholesale & retail | 2025 |
| Hausmann Fabrications Limited | Manufacturing | 2016 |
| Havlitten Holdings Limited | Real estate | 2025 |
| Hawkswood Property Limited | Construction | 2017 |
| Haywards Carpentry and Construction Ltd | Manufacturing | 2020 |
| HC 1225 Limited | Administrative & support | 2014 |
| HC Office Supplies Limited | Wholesale & retail | 2021 |
| HDN Consultants Ltd | Professional & scientific | 2023 |
| Health and Vibes Limited | Health & social care | 2025 |
| Healthcare Consulting Solutions Ltd | Professional & scientific | 2024 |
| Healthcare Learning Solutions Limited | Public administration | 2024 |
| Heaven & Stubbs Ltd | Manufacturing | 2009 |
| Heavy Scene Ltd | Information & communication | 2026 |
| Heet Finance Limited | Financial services | 2025 |
| Helen Swaddle Limited | Agriculture & fishing | 2014 |
| Heli-Network UK Ltd | Wholesale & retail | 2024 |
| Helihub Limited | Transport & logistics | 2007 |
| Hels Bells Events Ltd | Hospitality | 2024 |
| Henosc Limited | Health & social care | 2013 |
| Her.Halo CIC | Health & social care | 2026 |
| Herbies Vehicle Repairs Limited | Wholesale & retail | 2024 |
| Heritage Fine Woodwork Ltd | Construction | 2025 |
| Heritage Iron Ltd | Real estate | 2025 |
| Heron 41 Ltd | Real estate | 2015 |
| Heyford Park Properties Ltd | Construction | 2022 |
| Hham Limited | Other services | 2016 |
| High Performance Coaching Limited | Other services | 2012 |
| Highview Consultancy Limited | Professional & scientific | 2013 |
| Hillcrest Rising Developments Limited | Construction | 2004 |
| Hillcrest Rising Management Limited | Households | 2017 |
| Hilpex Limited | Hospitality | 2010 |
| Hinton & Co. Limited | Professional & scientific | 2005 |
| Hitchcox Motorcycles Ltd | Manufacturing | 2021 |
| HL Nails & Beauty Ltd | Other services | 2024 |
| HLS Trading Limited | Real estate | 2025 |
| Holbrook Ball Limited | Real estate | 2017 |
| Holpin Garden Services Ltd | Administrative & support | 2019 |
| Homefix Building and Maintenance Ltd | Construction | 2016 |
| Honest Policy Limited | Financial services | 2018 |
| Hoofprints Facilitated Learning Ltd | Education | 2024 |
| Hook and Sons Property Surveys Limited | Professional & scientific | 2017 |
| Hopcrafts Farm Limited | Administrative & support | 2020 |
| Hopell Limited | Construction | 2025 |
| Hopkins Enterprises Limited | Households | 2026 |
| Horizon Advisors Ltd | Professional & scientific | 2026 |
| Horwell Auto Services Limited | Wholesale & retail | 2011 |
| Horwell Farm Limited | Real estate | 2012 |
| Hostnotion Limited | Information & communication | 2020 |
| Hot Headed Limited | Other services | 2017 |
| HRC Spec Ltd | Manufacturing | 2022 |
| Huckleberry Farm Limited | Households | 2021 |
| Hula Interiors Ltd | Wholesale & retail | 2021 |
| Hummingbirds Bistro Limited | Hospitality | 2014 |
| Hummingbirds Catering Ltd | Hospitality | 2025 |
| Huntsmiths Automotive Limited | Wholesale & retail | 2016 |
| HUSLAT27 Ltd | Hospitality | 2025 |
| Hvkport Ltd | Financial services | 2021 |
| Hwrchoice Ltd | Wholesale & retail | 2025 |
| Hyderabadi Kitchen Newcastle Limited | Hospitality | 2023 |
| Hydrace Limited | Manufacturing | 2025 |
| Hydramex Limited | Wholesale & retail | 1975 |
| Hyper-Tech Events Ltd | Professional & scientific | 2020 |
| Hyperian Ltd | Professional & scientific | 2003 |
| Hyperslice Design Ltd | Other services | 2019 |
| Hyperstockuk Ltd | Wholesale & retail | 2025 |
| I Like That Property Lettings Limited | Real estate | 2019 |
| I-Five Distribution Limited | Wholesale & retail | 2003 |
| IAN Beeson Quality and Manufacturing Service Limited | Professional & scientific | 2017 |
| Ian's Autos Ltd | Wholesale & retail | 2019 |
| IC Capital Group Limited | Real estate | 2025 |
| Iceco International Ltd | Wholesale & retail | 2017 |
| Icon Capital Partners Limited | Manufacturing | 2019 |
| IDR Design Solutions Ltd | Professional & scientific | 2025 |
| Ildc Limited | Extraterritorial | 2010 |
| IMH GAS Services Limited | Construction | 2009 |
| Impact Fitness Ltd | Wholesale & retail | 2005 |
| Imperio Property Ltd | Real estate | 2024 |
| Implementation Consultants Ltd | Professional & scientific | 2018 |
| IN Stone Development Limited | Construction | 2019 |
| IN the LAB Recordings Ltd | Information & communication | 2022 |
| Incandescent Creative Ltd | Arts & recreation | 2025 |
| Independent Data Integration Services Ltd | Information & communication | 2020 |
| Indulgence Limited | Wholesale & retail | 1976 |
| Infinite Writing Ltd | Information & communication | 2021 |
| Infinity Funding Solutions Limited | Administrative & support | 2010 |
| Inform Learning Ltd | Education | 2017 |
| Infra Network Solutions Ltd | Information & communication | 2020 |
| Inner Sage Somatics Limited | Health & social care | 2025 |
| Innergrit Ltd | Manufacturing | 2020 |
| Insignis Health Ltd | Information & communication | 2026 |
| Insolens Ltd | Transport & logistics | 2026 |
| Inspired Driving Ltd | Wholesale & retail | 2025 |
| Insulate My Conservatory Ltd. | Construction | 2025 |
| Intelliful Ltd | Information & communication | 2025 |
| Interview Rookie Ltd | Education | 2025 |
| Investerge Ltd | Other services | 2019 |
| Ionetic Limited | Professional & scientific | 2021 |
| Ipswich Speedway Promotions Limited | Arts & recreation | 1989 |
| IQ Pest Control Ltd | Administrative & support | 2021 |