| HQ Express Ilkeston Ltd | Wholesale & retail | 2024 |
| HR & Payroll Team Ltd | Professional & scientific | 2024 |
| HSL Hospitality Limited | Hospitality | 2025 |
| HT Driveways & Landscaping Limited | Extraterritorial | 2024 |
| HTF Stainless Steel Fabrication Limited | Manufacturing | 1994 |
| Hub International Ltd | Wholesale & retail | 2025 |
| Hucknall Garden Centre Limited | Wholesale & retail | 2019 |
| Hutchinson Refrigeration Services Ltd | Energy | 2016 |
| Huthwaite Mechanical Works Ltd | Construction | 2024 |
| HVB Financial Services Limited | Financial services | 2013 |
| Hybrid Property Limited | Real estate | 2023 |
| Hygge&Ivy Homes Limited | Real estate | 2025 |
| Hygienic Pipework Solutions Ltd | Manufacturing | 2025 |
| IAN Baker Coaching Limited | Wholesale & retail | 2019 |
| IAN Baker Consultancy Limited | Professional & scientific | 2016 |
| IBC Liners Limited | Manufacturing | 1992 |
| IBYD2 Limited | Professional & scientific | 2011 |
| Icmg (Education) Limited | Education | 2014 |
| ICS Autos Ltd | Wholesale & retail | 2020 |
| Ideal Plumbing & Heating (Derby) Limited | Construction | 2004 |
| Ideas (Nottingham) Limited | Construction | 2011 |
| IGS Accounting Ltd | Professional & scientific | 2020 |
| IH Consulting Ltd | Construction | 2024 |
| IJH Electrical Ltd | Construction | 2015 |
| IKA Trading Ltd | Wholesale & retail | 2016 |
| Ilkeston Community Boxing and Sports Club Limited | Education | 2023 |
| Ilkeston Community Chapel CIC | Arts & recreation | 2026 |
| Ilkeston Community Theatre and Festival Limited | Arts & recreation | 2023 |
| Ilkeston Construction Limited | Construction | 2006 |
| Ilkeston Curry House Ltd | Hospitality | 2024 |
| Ilkeston Driveways & Dropped Kerbs Ltd | Construction | 2023 |
| Ilkeston Fabrications Ltd | Manufacturing | 2024 |
| Ilkeston Fencing Limited | Manufacturing | 2001 |
| Ilkeston Foods Ltd | Hospitality | 2025 |
| Ilkeston Gym and Fitness Ltd | Arts & recreation | 2026 |
| Ilkeston Insulation Ltd | Construction | 2024 |
| Ilkeston Joinery Limited | Manufacturing | 2000 |
| Ilkeston Kebabs Ltd | Hospitality | 2025 |
| Ilkeston Life Community Newspaper CIC | Information & communication | 2023 |
| Ilkeston Masonic Hall Association Limited | Other services | 1951 |
| Ilkeston Motor Factors Limited | Wholesale & retail | 2013 |
| Ilkeston Motor Group Traders Ltd | Wholesale & retail | 2023 |
| Ilkeston News Ltd | Wholesale & retail | 2019 |
| Ilkeston Phone Repairs Ltd | Wholesale & retail | 2024 |
| Ilkeston PLY & DIY Ltd | Wholesale & retail | 2012 |
| Ilkeston Property.Com Limited | Real estate | 2009 |
| Ilkeston Rugby Club Properties Limited | Arts & recreation | 1996 |
| Ilkeston Rugby Club Trading Limited | Arts & recreation | 2016 |
| Ilkeston Service & Repair Centre Limited | Wholesale & retail | 2009 |
| Ilkeston Sheds Ltd | Manufacturing | 2023 |
| Ilkeston Town FC Limited | Arts & recreation | 2017 |
| Ilkeston Tuition Centre Ltd | Education | 2025 |
| Ilkeston Tyres Ltd | Wholesale & retail | 2026 |
| Ilkeston Vehicle Sales Limited | Wholesale & retail | 2015 |
| IMF Trading Limited | Real estate | 1999 |
| IN IT Together Promotions Ltd | Professional & scientific | 2015 |
| IN Your Corner Limited | Other services | 2006 |
| Incept Property Ltd | Real estate | 2020 |
| Independent Care Link Limited | Health & social care | 2011 |
| Independent Sales Solutions Holdings Ltd | Professional & scientific | 2023 |
| Independent Sales Solutions Ltd | Wholesale & retail | 2023 |
| Indigo Business Limited | Wholesale & retail | 2015 |
| Indigo Housing Limited | Health & social care | 2023 |
| Indoor Farmer Ltd | Wholesale & retail | 2025 |
| Industrial Flexi-Covers Limited | Construction | 2014 |
| Industrial Spray Concepts Ltd | Manufacturing | 2007 |
| Industrial Steel Frames Limited | Construction | 2009 |
| Infinite Cornerstone Ltd | Households | 2019 |
| Infiniti Projects Limited | Construction | 2012 |
| INK Kartel Ltd | Arts & recreation | 2025 |
| Innottingham Web Design Ltd | Information & communication | 2016 |
| Innovate External Cleaning Ltd | Administrative & support | 2024 |
| Inspirational Environments Ltd | Construction | 2013 |
| Inspiratti Limited | Information & communication | 2021 |
| Inspired Bicycles Ltd | Wholesale & retail | 2007 |
| Inspired Commercial Limited | Real estate | 2018 |
| Insulation Nation Limited | Construction | 2015 |
| Intabag Limited | Manufacturing | 2006 |
| Integro Design & Construction Ltd | Construction | 2025 |
| Inter-Continental Consulting Limited | Extraterritorial | 2011 |
| Interactive Data Technology Limited | Information & communication | 1997 |
| Interhirehold 2 Limited | Financial services | 2022 |
| Interhirehold Limited | Financial services | 2022 |
| Inverter Drive Systems Holdings Limited | Financial services | 2022 |
| IOB Rentals Ltd | Real estate | 2025 |
| Iphone GSM Store Limited | Information & communication | 2013 |
| Iplus Consultants Limited | Information & communication | 2016 |
| Iridium I.R. Fire Ltd | Construction | 2003 |
| IRW Construction Ltd | Construction | 2020 |
| IRW Groundworks Ltd | Construction | 2017 |
| Isaac Lightfoot Property Ltd | Wholesale & retail | 2025 |
| Isik Global Limited | Wholesale & retail | 2023 |
| Istanbul Barbers 2 Ltd | Other services | 2025 |
| IT4CONSULTANTS Limited | Information & communication | 2014 |
| IT4RESEARCHDEVELOPMENT Ltd | Other services | 2018 |
| ITK Electrical Services Ltd | Construction | 2025 |
| IUM Housing Limited | Real estate | 2025 |
| Iveo Consultancy Ltd | Construction | 2025 |
| IVY Meadow Childcare Ltd | Health & social care | 2024 |
| J & R Telecoms Ltd | Construction | 2021 |