| HR Focus Limited | Professional & scientific | 2008 |
| HRS Ventures Ltd | Manufacturing | 2008 |
| Hrycu Trans Ltd | Construction | 2013 |
| HSM Developments Ltd | Real estate | 2025 |
| Hstg Maintenance Contracts Limited | Administrative & support | 2019 |
| HTC Build Ltd | Construction | 2023 |
| Huck Estates Ltd | Real estate | 2023 |
| Hudson Broom Ltd | Professional & scientific | 2024 |
| Hukleys Limited | Professional & scientific | 2016 |
| Huller Ltd | Health & social care | 2023 |
| Humanitarian Logistics Association | Other services | 2008 |
| Humble Care Agency Limited | Hospitality | 2024 |
| Hump Back Securities Limited | Financial services | 1969 |
| Humphreys Heating Ltd | Construction | 2023 |
| Humpty Dumpty Nursery Ltd | Education | 2013 |
| Hungry Bunnies Limited | Hospitality | 2024 |
| Hungry Olive Restaurants Limited | Hospitality | 2024 |
| Hunt & Wilson Limited | Wholesale & retail | 2015 |
| Hunter Nicholls Pubs Ltd | Hospitality | 2024 |
| Hunters 4 Staff Ltd | Administrative & support | 2020 |
| Hunters Homes and Lettings Ltd | Real estate | 2025 |
| Hunters Lane Estates Limited | Real estate | 2000 |
| Hunters MID Haulage Limited | Transport & logistics | 2007 |
| Huntersjoy Limited | Health & social care | 2004 |
| Hunts Bookshop Ltd | Information & communication | 2018 |
| Hunts Combined Holdings Ltd | Professional & scientific | 2025 |
| Huntsman Carvery Limited | Hospitality | 2004 |
| Hussain & Sons Superstore Ltd | Wholesale & retail | 2020 |
| Hussar Limited | Transport & logistics | 2012 |
| Hyannis Strategy Ltd | Professional & scientific | 2020 |
| Hyde Park Construction Ltd | Construction | 2014 |
| Hygiene Xpress Group Ltd | Administrative & support | 2020 |
| Hyperscale Advisory Group Limited | Information & communication | 2026 |
| Hypexcs Ltd | Arts & recreation | 2026 |
| I & M Fryer Investments Limited | Real estate | 2023 |
| I AM Ichronic CIC | Education | 2025 |
| I DO Warwick Limited | Wholesale & retail | 2014 |
| I Like Driving Ltd | Transport & logistics | 2020 |
| I Love Art Limited | Arts & recreation | 2006 |
| I O Medical Ltd | Health & social care | 2022 |
| I Truck Ltd | Manufacturing | 2025 |
| I.S. Computers Limited | Wholesale & retail | 2000 |
| Iacob Services Ltd | Transport & logistics | 2019 |
| IAF Associates Limited | Health & social care | 2015 |
| IAF Holdings Limited | Real estate | 2018 |
| IAN Bradley (UK) Ltd | Wholesale & retail | 2010 |
| IAN W Turner Ltd | Professional & scientific | 2012 |
| Iancu Moto Ltd | Manufacturing | 2025 |
| IBD Trans Ltd | Transport & logistics | 2022 |
| Icchm Contractor Ltd | Professional & scientific | 2025 |
| Icebroom Motors Limited | Wholesale & retail | 1983 |
| Ichpl Ltd | Professional & scientific | 2018 |
| Icon Retail Ltd | Wholesale & retail | 2024 |
| ICW2023 Limited | Real estate | 2023 |
| ID Enterprises Ltd | Real estate | 2022 |
| ID Genie Limited | Manufacturing | 2016 |
| IDEA4 Limited | Administrative & support | 2011 |
| Identity Beyond Diagnosis CIC | Administrative & support | 2026 |
| Idhk Limited | Transport & logistics | 2019 |
| Idlydosaexpress Ltd | Hospitality | 2024 |
| IE Office Equipment Limited | Wholesale & retail | 1992 |
| IF European Limited | Transport & logistics | 2015 |
| IF Social Studio Ltd | Professional & scientific | 2025 |
| IF Tech Ltd | Professional & scientific | 2025 |
| IGC Homecare Ltd | Public administration | 2025 |
| Ignat Trans Ltd | Administrative & support | 2025 |
| Ignite and Rise CIC | Education | 2025 |
| Igwt Holdings Ltd | Financial services | 2025 |
| II Engineering Limited | Administrative & support | 2016 |
| IL Clinic Ltd | Other services | 2022 |
| Ilbc Ltd | Administrative & support | 2016 |
| ILE Anyi Ltd | Professional & scientific | 2026 |
| Illusion 1962 Limited | Administrative & support | 2010 |
| Im&Co Ltd | Professional & scientific | 2021 |
| Imara Consulting Group Limited | Professional & scientific | 2025 |
| IMC Plastering Ltd | Construction | 2022 |
| Imgen Ltd | Information & communication | 2022 |
| IMH Consulting Limited | Professional & scientific | 2005 |
| Immersive Innovation Ltd | Information & communication | 2015 |
| Imperium Wheels Group Ltd | Wholesale & retail | 2026 |
| Impex Customs Agency Ltd | Transport & logistics | 2022 |
| Imported Brands International Limited | Wholesale & retail | 1992 |
| Impressive Ventures Limited | Wholesale & retail | 2002 |
| Improvesarios Ltd | Arts & recreation | 2023 |
| IMS Homes Limited | Real estate | 2019 |
| IN and OUT Electrics Ltd. | Construction | 2022 |
| IN Spa Solutions Limited | Other services | 2011 |
| In-Line Building Services Ltd | Construction | 2018 |
| In-Situ Machining Solutions (UK) Limited | Professional & scientific | 2001 |
| Inception Machines Ltd | Manufacturing | 2016 |
| Inclusive Bakes Ltd | Manufacturing | 2022 |
| Inclusive Send Advocacy Ltd | Education | 2022 |
| Inconosis Limited | Information & communication | 2024 |
| Independent Forklift Services (Midlands) Ltd. | Manufacturing | 2015 |
| Independent Renault Services Ltd | Wholesale & retail | 2011 |
| Indiawaale Limited | Hospitality | 2024 |
| Indigo Financial Solutions Limited | Financial services | 2004 |
| Indy Eyes Limited | Health & social care | 2012 |
| Inesh Artistry UK Ltd | Professional & scientific | 2021 |
| Infection Control Cleaning (ICC) Ltd | Administrative & support | 2016 |