| Hine Freight Services Ltd | Transport & logistics | 2001 |
| Hines Ceilings & Interiors Ltd | Construction | 2025 |
| Hire and Repairs Ltd | Administrative & support | 2018 |
| Hireteq Ltd | Administrative & support | 2025 |
| Hirst Accounting Ltd | Professional & scientific | 2014 |
| HK Tech Limited | Information & communication | 2017 |
| HM2U Hire Ltd | Information & communication | 2026 |
| Hmcarsrepair Ltd | Wholesale & retail | 2022 |
| HNG Investments Ltd | Real estate | 2025 |
| Hobs and Knobs Limited | Wholesale & retail | 2019 |
| Hodsock Priory Limited | Administrative & support | 2006 |
| Hodthorpe General Stores Limited | Wholesale & retail | 2023 |
| Holly Plumley Performance Arts Limited | Education | 2026 |
| Hollybank Care Limited | Health & social care | 2026 |
| Holmegarth Garage Ltd | Wholesale & retail | 2023 |
| Holmes Electrical & Renewables Limited | Construction | 2024 |
| Holy Spirit Care Group Limited | Administrative & support | 2019 |
| Home Market DIRECT2U Ltd | Wholesale & retail | 2024 |
| Home Shield Roofing Ltd. | Construction | 2025 |
| Homekare Services Ltd | Health & social care | 2023 |
| Homes on Water Limited | Professional & scientific | 2020 |
| Honey & FIG Limited | Hospitality | 2022 |
| Hope & Elvis Ltd | Education | 2025 |
| Hope Community Services | Administrative & support | 2009 |
| Hornes Homes Limited | Construction | 2022 |
| Horseshoe Hub Ltd | Wholesale & retail | 2022 |
| Horus Editions Limited | Information & communication | 1995 |
| Hotel Technology Consulting Services Ltd | Information & communication | 2019 |
| House Lord Properties UK Ltd | Real estate | 2021 |
| House of Blanks Limited | Wholesale & retail | 2023 |
| House of SG Ltd | Other services | 2026 |
| Houssaini Ltd | Real estate | 2023 |
| Howarth Joseph Holdings Ltd | Administrative & support | 2015 |
| Howdle Limited | Manufacturing | 1989 |
| Howes and Home Ltd | Construction | 2015 |
| Howlett Partnership Ltd | Professional & scientific | 2023 |
| HPG Plumbing & GAS Services Limited | Construction | 2013 |
| HRT UK Limited | Financial services | 2003 |
| HSR Services Ltd | Wholesale & retail | 2025 |
| Hub Total Living Solutions Limited | Construction | 2020 |
| Hughes Technology Consulting Ltd | Information & communication | 2022 |
| Hughes-Williams Design Limited | Manufacturing | 2025 |
| Hy-Green Ltd | Wholesale & retail | 2020 |
| Hygiene Improvement Consultancy Ltd | Professional & scientific | 2023 |
| Hyperion IT Limited | Administrative & support | 2023 |
| I G Network Solutions Ltd | Wholesale & retail | 2015 |
| I&C Holdings (Worksop) Limited | Financial services | 2019 |
| I&C Property (Worksop) Limited | Real estate | 2023 |
| I&J Richards Ltd | Construction | 2024 |
| IAN Bailey Global Discovery Limited | Professional & scientific | 2019 |
| IAN Oxby Joinery Ltd | Construction | 2009 |
| Iarob Property Ltd | Real estate | 2024 |
| Ibeswicklogistics Ltd | Professional & scientific | 2022 |
| Idin Ltd | Transport & logistics | 2026 |
| IF Property Holdings Ltd | Real estate | 2026 |
| Ignas Raila Transport Limited | Transport & logistics | 2015 |
| Ignite Strength and Fitness Ltd | Arts & recreation | 2019 |
| Ilett & Clark Solicitors Limited | Professional & scientific | 2011 |
| Imbrem Ltd | Wholesale & retail | 2025 |
| Impact Vehicle Solutions Limited | Wholesale & retail | 2022 |
| Imperator Transport Ltd | Manufacturing | 2022 |
| IN2GRATE Service Limited | Administrative & support | 2011 |
| Incline Recruitment Limited | Administrative & support | 2022 |
| Independent Playground Inspections Limited | Professional & scientific | 2013 |
| Inderdeep Private Limited | Households | 2019 |
| Indiana Horizon Capital Ltd | Real estate | 2026 |
| Indie & Hunter Inns Limited | Hospitality | 2020 |
| Indigo Lane Ltd | Construction | 2021 |
| Industrial GAS Safety Limited | Education | 2019 |
| Industry Lean Solutions Limited | Professional & scientific | 2020 |
| Inhand Systems Limited | Information & communication | 1995 |
| Inner Purity Ltd | Health & social care | 2019 |
| Inner-Works Business Consultancy Ltd | Professional & scientific | 2019 |
| Installation & Maintenance Services (Worksop) Limited | Construction | 2013 |
| Insulated Conservatory Ceilings Ltd | Extraterritorial | 2019 |
| Insync Physiotherapy & Sports Injury Limited | Health & social care | 2022 |
| Integra (Worksop) Ltd | Professional & scientific | 2017 |
| Integral Legal Services Ltd | Professional & scientific | 2012 |
| Integrity Wholesale UK Ltd | Wholesale & retail | 2025 |
| Intelliade Limited | Wholesale & retail | 2018 |
| Inter-Arc Marketing Ltd | Information & communication | 2000 |
| Interactive Keywords Limited | Education | 2013 |
| Interfit (Worksop) Limited | Other services | 1980 |
| International Beauty & Aesthetics Limited | Public administration | 2025 |
| International Cuisine Limited | Manufacturing | 1988 |
| Intransit Solutions Ltd | Transport & logistics | 2025 |
| Intrasco Limited | Wholesale & retail | 2012 |
| ION IT Limited | Information & communication | 2012 |
| Ippc Consultants Ltd | Professional & scientific | 2006 |
| IPS Electrical Ltd | Construction | 2014 |
| Irenka Express Ltd | Wholesale & retail | 2016 |
| Irizar U.K. Limited | Wholesale & retail | 2011 |
| Iron Asylum Strength &Fitness Ltd | Other services | 2018 |
| ITS Communications Ltd | Construction | 2023 |
| IVI Cargo Ltd | Transport & logistics | 2022 |
| Ivorblueproperties Ltd | Real estate | 2025 |
| Ivory Lodge Services Limited | Health & social care | 2022 |
| IVY Holme Group Ltd | Real estate | 2013 |
| IVY Rose Creative Ltd | Professional & scientific | 2025 |
| J & B Teasdale Ltd | Real estate | 2016 |