| Hicks (3) Limited | Manufacturing | 1971 |
| High Point Building & Roofing Limited | Construction | 2020 |
| High TOR Developments Ltd | Construction | 2017 |
| Hikari Mats Limited | Wholesale & retail | 2025 |
| Hikari North Ltd | Professional & scientific | 2024 |
| Hike SEO Ltd | Administrative & support | 2016 |
| Hillbrook Developments Ltd | Construction | 2025 |
| Hinckley Electrical Ltd | Construction | 2024 |
| HIP & Knee Solutions Limited | Health & social care | 2016 |
| HJB Healthcare Limited | Health & social care | 2017 |
| HMS Decorative Surfacing Ltd | Construction | 2009 |
| Hoardmark Ltd | Construction | 2025 |
| Hockley Green Park Limited | Construction | 2023 |
| Hodge & Daughters Ltd | Real estate | 2018 |
| HOG Properties (Lutterworth) Ltd. | Real estate | 2016 |
| HOK Investment Services Ltd | Real estate | 2024 |
| Hold the Fort Limited | Professional & scientific | 2020 |
| Hollybush Property Services Ltd | Financial services | 2018 |
| Home Care Leicester Limited | Health & social care | 2025 |
| Home Choice Services Limited | Other services | 2020 |
| Home Edition Ltd | Extraterritorial | 2012 |
| Homethyme Ltd | Administrative & support | 2026 |
| Hometown BBQ Ltd | Hospitality | 2020 |
| Hooper Medical Services Ltd | Health & social care | 2019 |
| Hope Farm Organics Limited | Agriculture & fishing | 2014 |
| Horace Batten Boot Supplies Limited | Wholesale & retail | 2004 |
| Horizons Media Group Limited | Arts & recreation | 2018 |
| Hornby George PR Limited | Professional & scientific | 2023 |
| Hornsby Properties Limited | Wholesale & retail | 2001 |
| Horrell Construction and Maintenance Limited | Construction | 2013 |
| Hospitality Management Services (HMS) Limited | Other services | 2017 |
| Hot Coatings Limited | Professional & scientific | 2011 |
| Hot Girl Swaps Ltd | Wholesale & retail | 2025 |
| Hothorpe Hall (Dining) Limited | Hospitality | 2021 |
| Hothorpe Hall (Venues) Limited | Hospitality | 2021 |
| House of Kelly Consulting Ltd | Professional & scientific | 2022 |
| Howard Health Limited | Health & social care | 2022 |
| Howsin Building Contractors Limited | Construction | 2005 |
| HQ35 Ltd | Professional & scientific | 2019 |
| HRM Hotel Revenue Management Ltd | Professional & scientific | 2020 |
| HSD TEC Limited | Professional & scientific | 2014 |
| Husbands Bosworth Gliding Club Ltd | Arts & recreation | 1953 |
| Husbands Bosworth Gliding Club Trading Limited | Real estate | 2023 |
| Husky International Limited | Wholesale & retail | 2009 |
| Husky Refrigerators (UK) Limited | Wholesale & retail | 2008 |
| Husky Retail Limited | Wholesale & retail | 2008 |
| Hutchinson Building Contractors Limited | Construction | 2016 |
| HW Electrical Ltd | Construction | 2023 |
| Hybrid Performance Strength & Conditioning Ltd | Arts & recreation | 2016 |
| Hybrid Power Jets Ltd | Professional & scientific | 2014 |
| Hypermotive Limited | Manufacturing | 2016 |
| Hypermotive Technologies Limited | Manufacturing | 2024 |
| I.E.E.C. Limited | Construction | 1999 |
| I.G. Smith & Sons Ltd | Manufacturing | 2012 |
| I.T Finlay Limited | Professional & scientific | 2017 |
| I15 Project Solutions Ltd | Professional & scientific | 2015 |
| IAN Prescott Associates Limited | Professional & scientific | 2008 |
| Iconbric Ltd | Wholesale & retail | 2025 |
| Idea Works Limited | Professional & scientific | 2010 |
| Ideal Interiors (East Anglia) Limited | Wholesale & retail | 2006 |
| Ideathon Limited | Extraterritorial | 2005 |
| Igoza Solutions Limited | Administrative & support | 2006 |
| IJM Property Ltd | Real estate | 2022 |
| IJM Radiology Clinic Ltd | Health & social care | 2016 |
| Ikarus Energy Limited | Construction | 2024 |
| Ikarus Limited | Construction | 2011 |
| IKL Limited | Transport & logistics | 2019 |
| Imagine Property Solutions Ltd | Real estate | 2024 |
| Imonic Limited | Construction | 1999 |
| Imperium Planning and Project Controls Ltd | Construction | 2026 |
| In-Store Initiatives Limited | Professional & scientific | 2005 |
| Inch by Inch Developments Ltd | Real estate | 2020 |
| Indian Vojon BD Ltd | Hospitality | 2023 |
| Infinity Alpacas Ltd | Agriculture & fishing | 2021 |
| Infinity Matrix Group Ltd | Professional & scientific | 2023 |
| Infinity Performance Nutrition Ltd | Arts & recreation | 2024 |
| Infometrix Ltd | Information & communication | 2017 |
| Inform Plastics Limited | Manufacturing | 1982 |
| Infovea Limited | Professional & scientific | 2009 |
| Ingenio Carrus Ltd | Wholesale & retail | 2019 |
| Ingenio Fidem Ltd | Wholesale & retail | 2014 |
| Inprolet Limited | Real estate | 1961 |
| Inside Tracks Research Limited | Other services | 2011 |
| Inspiring Primaries Academy Trust | Education | 2013 |
| Inspirit Learning Limited | Administrative & support | 2008 |
| Integrated Consulting Limited | Professional & scientific | 2019 |
| Intelligent Financial Advisory Ltd | Financial services | 2014 |
| Intelligent Heating Company Limited | Construction | 2002 |
| Inter-Power UK Limited | Mining & quarrying | 1987 |
| Intercede 2000 Limited | Extraterritorial | 2000 |
| Intercede Group PLC | Information & communication | 2000 |
| Intercede Limited | Information & communication | 1992 |
| Interdrive Piling Ltd | Manufacturing | 2014 |
| Interline Roofing Services Ltd | Construction | 2024 |
| Interstellar ICA Ltd | Administrative & support | 2017 |
| Intoform Newwave Limited | Manufacturing | 2005 |
| Intohimo Limited | Professional & scientific | 2018 |
| Invested Engineering Limited | Professional & scientific | 2009 |
| IP Joinery Ltd | Construction | 2022 |
| Iris and Sidney Consulting Limited | Professional & scientific | 2024 |