| HEX Competitions Ltd | Arts & recreation | 2024 |
| Hexos Software Solutions Limited | Information & communication | 2023 |
| HF Electrical Projects Ltd | Construction | 2025 |
| HF Flooring Supplies Ltd | Wholesale & retail | 2025 |
| Higgins and Rose Limited | Professional & scientific | 2013 |
| High Brow Bar Limited | Other services | 2026 |
| High Point Cattery Ltd | Agriculture & fishing | 2026 |
| High Top Roofing Services Ltd | Manufacturing | 2025 |
| Hill Top MOT Centre Ltd | Wholesale & retail | 2024 |
| Hill Top Motor Company Limited | Wholesale & retail | 2024 |
| Hillcroft Services LLP | | 2017 |
| Hinchcliffe Homes Limited | Real estate | 2026 |
| HM Accountancy Services Limited | Professional & scientific | 2018 |
| Hogert Tools (UK & Ireland) Limited | Wholesale & retail | 2025 |
| Hogsthorpe Investments Ltd | Financial services | 2021 |
| Holistiq Coaching Ltd | Education | 2025 |
| Hollie Wood Aesthetics Academy Limited | Other services | 2024 |
| Hollinwell Investments Holdings Limited | Manufacturing | 2015 |
| Hollis Group Holdings Limited | Manufacturing | 2000 |
| Homecare Lettings Ltd | Real estate | 2019 |
| Homes AKC Limited | Real estate | 2025 |
| Honestuk Ltd | Construction | 2026 |
| Hopkinson Property Limited | Manufacturing | 1990 |
| Horizo Limited | Wholesale & retail | 2025 |
| Horse Spirit Project CIC | Other services | 2019 |
| Hoves Group Limited | Information & communication | 2025 |
| Howells Green Grocers Limited | Wholesale & retail | 2026 |
| HRS Maintenance Limited | Real estate | 2021 |
| HRS Services (2024) Limited | Construction | 2024 |
| Hrwuk Ltd | Health & social care | 2018 |
| HTN Electrical Limited | Manufacturing | 2015 |
| Huilin Ecoware Ltd | Wholesale & retail | 2018 |
| Huthwaite Garage Services Limited | Wholesale & retail | 2010 |
| Huthwaite Road 1961 Limited | Extraterritorial | 2014 |
| Huthwaite Tandoori Limited | Hospitality | 2023 |
| Hutley Software Limited | Information & communication | 2021 |
| HVT Solutions Limited | Administrative & support | 2006 |
| Hypnassist Ltd | Health & social care | 2015 |
| I&O Ltd | Hospitality | 2025 |
| IAN and Andy Property Rental Limited | Real estate | 2023 |
| Iced Couture Limited | Manufacturing | 2025 |
| Idopromise Ltd | Health & social care | 2025 |
| Ille Paper Services UK Ltd | Other services | 2013 |
| IM Car Sales Ltd | Wholesale & retail | 2026 |
| Implies Ltd | Manufacturing | 2021 |
| IMS Consultancy Limited | Professional & scientific | 2018 |
| IMS Properties Limited | Real estate | 2022 |
| Inanez Hacim Health Care Limited | Health & social care | 2019 |
| Independent Visitor Services Ltd | Professional & scientific | 2020 |
| Infinite Fire Protection Limited | Public administration | 2025 |
| Infinite Vehicle Sales Ltd | Wholesale & retail | 2023 |
| Infinity Alloys 2 Ltd | Wholesale & retail | 2019 |
| Inlihtan Limited | Administrative & support | 2016 |
| Iskender Catering Limited | Extraterritorial | 2024 |
| Italia TEC Ltd | Wholesale & retail | 2015 |
| J a Hall Ltd | Administrative & support | 2024 |
| J and J Plant Limited | Administrative & support | 2021 |
| J and R Bodyworks Limited | Wholesale & retail | 2005 |
| J B Facades Limited | Other services | 2023 |
| J D Birchall Properties Ltd | Construction | 2016 |
| J Ward Joinery Limited | Construction | 2017 |
| J Z Cars Limited | Wholesale & retail | 2021 |
| J&J Transport Services Limited | Transport & logistics | 2025 |
| J. Cielecki Limited | Construction | 2005 |
| J. T. Holdings (Notts) Ltd | Hospitality | 2025 |
| J.H Traders Ltd | Wholesale & retail | 2025 |
| J.P. Steel Fabrications Limited | Manufacturing | 2003 |
| J.Steel Utilities & Civil Engineering Specialists Ltd | Construction | 2024 |
| J.W.R Services Ltd | Administrative & support | 2026 |
| Jacdeb Limited | Administrative & support | 2025 |
| Jack AI Consulting Ltd | Wholesale & retail | 2025 |
| Janos MJ Transport Limited | Transport & logistics | 2025 |
| JAYXR87 Limited | Health & social care | 2021 |
| JB Timber Construction Ltd | Construction | 2022 |
| JBJ Steel Services Ltd | Manufacturing | 2025 |
| JC Whyman Ltd | Professional & scientific | 2026 |
| JCO Local Ltd | Hospitality | 2020 |
| JCO Pubs Ltd | Hospitality | 2019 |
| JD Delivery Notts Ltd | Transport & logistics | 2018 |
| Jd&Sons Construction Limited | Construction | 2019 |
| JDG Properties Holding Limited | Financial services | 2025 |
| Jepps Care Ltd | Health & social care | 2013 |
| JET Autos Ltd | Wholesale & retail | 2025 |
| JET Press Property Limited | Real estate | 2017 |
| JHK Dance Limited | Arts & recreation | 2017 |
| Jjones Letting Limited | Real estate | 2025 |
| JJT Parsec Limited | Wholesale & retail | 2023 |
| JK Accommodation Limited | Real estate | 2025 |
| JKINTERIORS42 Ltd | Manufacturing | 2019 |
| JL Motor Sales Ltd | Wholesale & retail | 2025 |
| JLH Electrical & Joinery Services Ltd | Construction | 2024 |
| JM Global Transit Ltd | Transport & logistics | 2025 |
| JMP Grips Limited | Information & communication | 2019 |
| JOB TAP Ltd | Information & communication | 2025 |
| John Eastwood Hospice Trust | Health & social care | 2006 |
| Johns Property Group Ltd | Real estate | 2025 |
| JP Property Maintenance (Huthwaite) Limited | Construction | 2019 |
| Jrcs Developments Ltd | Real estate | 2021 |
| JS Minibuses Limited | Transport & logistics | 2025 |
| Jsp&Sons Limited | Construction | 2015 |