| Inspire Kidz Ltd | Education | 2025 |
| Inspiring-U Ltd | Health & social care | 2020 |
| Instone Construction Services Ltd | Construction | 2014 |
| Intersite Engineering Solutions Ltd | Manufacturing | 2013 |
| Investment Planning and Management Services Limited | Financial services | 2006 |
| Iphix Phones Ltd | Manufacturing | 2022 |
| Isolated Systems Limited | Professional & scientific | 1970 |
| Isotex Rubber Limited | Professional & scientific | 2014 |
| J & a Engineering (Derby) Limited | Manufacturing | 2001 |
| J Burke Limited | Other services | 2018 |
| J Richards Plumbing and Heating Ltd | Construction | 2022 |
| J&B Contract Services Ltd | Construction | 2025 |
| J&R Boxall Home Improvements Limited | Construction | 2022 |
| J.Lambley Plumbing & Heating Ltd | Construction | 2024 |
| Jack Frost Limited | Wholesale & retail | 2016 |
| Jakepokemartcards Limited | Wholesale & retail | 2025 |
| James Elliott Design Ltd | Construction | 2025 |
| Jane Swift Ltd | Professional & scientific | 2024 |
| Jasp Developments Ltd | Construction | 2016 |
| JCL 23 Ltd | Hospitality | 2021 |
| JCM Plumbing & Heating (Nottm) Ltd | Construction | 2022 |
| JD Bricklaying Services Limited | Construction | 2016 |
| Jdoman Railway Ltd | Construction | 2022 |
| Jen's Xplorers Ltd | Health & social care | 2019 |
| Jenkins Logistics Limited | Administrative & support | 2017 |
| Jeta Motorsport Ltd | Wholesale & retail | 2021 |
| JFI Consulting Ltd | Professional & scientific | 2025 |
| JFW Properties (Derby) Limited | Real estate | 2020 |
| Jhnb Supplies Ltd | Wholesale & retail | 2017 |
| JJF Cars Ltd | Wholesale & retail | 2022 |
| JKB Marketing Ltd | Administrative & support | 2012 |
| JL Dance Academy Limited | Arts & recreation | 2018 |
| JNS Property Renovations Ltd | Construction | 2023 |
| JOB Done Home Improvements Limited | Construction | 2019 |
| JOE Tully Cars Ltd | Wholesale & retail | 2015 |
| Jolly Mixtures LP | | 2011 |
| Joule Forge Limited | Wholesale & retail | 2024 |
| Joy Clarke Soft Furnishings Limited | Wholesale & retail | 2002 |
| JPH Painting and Decorating Ltd | Construction | 2019 |
| JPL Property & Services Ltd | Construction | 2017 |
| JPL Property Services Ltd | Households | 2023 |
| Jpsearston Building and Maintenance Limited | Construction | 2025 |
| JRM Plumbing and GAS (East Midlands) Ltd | Construction | 2024 |
| JRW Electrical Solutions Ltd | Construction | 2025 |
| JSB Joinery Limited | Construction | 2017 |
| Jsdesigner Ltd | Wholesale & retail | 2023 |
| JT DEV Holdings Ltd | Professional & scientific | 2019 |
| JW Gilbert and SON Limited | Construction | 2009 |
| K E G Engineering Services Limited | Professional & scientific | 2007 |
| K T Smith & SON Limited | Construction | 2010 |
| Kate Richmond Aesthetics Ltd | Health & social care | 2020 |
| KDM Properties and Rentals Ltd | Real estate | 2026 |
| Keetley’S Dental Laboratory Ltd | Manufacturing | 2025 |
| Kellymc Property Services Limited | Real estate | 2021 |
| Kevin Parkinson Ltd | Professional & scientific | 2024 |
| Key Developments and Projects Limited | Construction | 2026 |
| KH Nurseries Ltd | Education | 2017 |
| Kingdom Accountancy Services Ltd | Professional & scientific | 2013 |
| Kirk & Associates Ltd | Administrative & support | 2021 |
| Kirkby Group Ltd | Information & communication | 2026 |
| KJB Tool Hire Limited | Administrative & support | 2023 |
| KLM Hair Limited | Other services | 2021 |
| KLN Accountancy Services Limited | Professional & scientific | 2014 |
| Knap Group Limited | Construction | 2017 |
| Knightsbridge Roofing Services Ltd | Construction | 2021 |
| KRB Homes Limited Ltd | Real estate | 2020 |
| Kumusha Connect Ltd | Financial services | 2026 |
| KWS Property Investment Ltd | Real estate | 2024 |
| Kyogoku Saunas Ltd | Health & social care | 2026 |
| L J Stephens Electrical Services Ltd | Construction | 2011 |
| L.A. Systems (Holdings) Limited | Financial services | 2020 |
| L.A.Systems Limited | Wholesale & retail | 2001 |
| LA Systems (Layers) Limited | Construction | 2020 |
| LA Systems Group Limited | Financial services | 2022 |
| LAD Communications Ltd | Information & communication | 2023 |
| Lago Holdings Limited | Financial services | 2017 |
| Langley Community Trust CIC | Real estate | 2018 |
| Lawley Micropubs Limited | Hospitality | 2016 |
| Lawrencetown Group Ltd | Manufacturing | 2019 |
| Leadmill Brewery Limited | Manufacturing | 2003 |
| LEE Smith Electrical Limited | Construction | 2013 |
| Letnest Property Management Ltd | Real estate | 2025 |
| LIBERTY24 Ltd | Construction | 2025 |
| Little Moo's Play Barn Ltd | Health & social care | 2025 |
| Little Transport Limited | Transport & logistics | 1998 |
| Living Wise Properties Ltd | Real estate | 2026 |
| Lkirk Creatives Limited | Arts & recreation | 2018 |
| Loaded Inc Ltd | Construction | 2015 |
| Lobina Capital Limited | Financial services | 2024 |
| Lokyo Packaging UK Ltd | Wholesale & retail | 2023 |
| Lombardi Pizza Heanor Limited | Hospitality | 2026 |
| Look Alive Agency Ltd | Professional & scientific | 2026 |
| Loscoe Convenience Stores Ltd | Wholesale & retail | 2021 |
| Lotto Properties Freehold Limited | Real estate | 2025 |
| Love Detective Ltd | Professional & scientific | 2024 |
| Love That Live Limited | Administrative & support | 2016 |
| LSW Motorsport and Aerospace Services Ltd | Manufacturing | 2018 |
| LTS Drilling Ltd | Construction | 2022 |
| LUK Training Ltd | Professional & scientific | 2022 |
| Luke Morton Estate Agent Ltd | Real estate | 2026 |