| Home Finance Direct Ltd | Extraterritorial | 2024 |
| Hopton Brow Investments Limited | Professional & scientific | 2017 |
| Hopton Brow Limited | Professional & scientific | 2006 |
| Hopton Build (Yorkshire) Ltd | Construction | 2015 |
| Hopton Estates Limited | Real estate | 1951 |
| House of Gatt Ltd | Professional & scientific | 2023 |
| Househill Bess Limited | Energy | 2022 |
| Howarths Garage Ltd | Wholesale & retail | 2019 |
| Howker Ltd | Manufacturing | 2020 |
| Hudson Landscapes Limited | Administrative & support | 2019 |
| Huluk & Co Ltd | Real estate | 2011 |
| Humac Associates Limited | Transport & logistics | 2005 |
| Humac Associates Supplies Limited | Wholesale & retail | 2005 |
| Humac Properties Ltd | Real estate | 2022 |
| Humba Services Limited | Health & social care | 2022 |
| Humbleburn Wind Turbine LLP | | 2014 |
| IAN a Marshall Limited | Arts & recreation | 2010 |
| IED Limited | Information & communication | 2009 |
| Iinouiio Ltd | Manufacturing | 2019 |
| IKL Driver Services Limited | Transport & logistics | 2015 |
| Imap Electrical Ltd | Construction | 2016 |
| Imap Group Limited | Real estate | 2021 |
| Imap Holdings Ltd | Real estate | 2022 |
| Inc. Architecture Ltd | Professional & scientific | 2007 |
| Inchem Finance Limited | Financial services | 1982 |
| Industrial Technical Solutions Ltd | Professional & scientific | 2021 |
| Intent Clothing Limited | Wholesale & retail | 2019 |
| Inventronix Limited | Manufacturing | 2025 |
| Isabel KAY Properties Limited | Real estate | 2019 |
| Iscarion Limited | Extraterritorial | 2025 |
| Ivital Ltd | Health & social care | 2025 |
| IVY Avenue Limited | Wholesale & retail | 2020 |
| J & L Transport Solutions Ltd | Transport & logistics | 2026 |
| J D M Freight Services Limited | Transport & logistics | 2010 |
| J Dedman Shooting Services Ltd | Arts & recreation | 2005 |
| J L Transport & Sons Limited | Transport & logistics | 2020 |
| J&S Rentals Limited | Real estate | 2021 |
| J. Exley Limited | Construction | 1959 |
| J.Bradbury & Company(Saddleworth),Limited | Manufacturing | 1920 |
| Jabry Properties Ltd | Real estate | 2020 |
| JAC Property Renovations Limited | Construction | 2009 |
| James Stewart Counselling Ltd | Health & social care | 2023 |
| James Walker Textiles Limited | Manufacturing | 2007 |
| Jatmecs Ltd | Real estate | 2023 |
| JAX Construction Ltd | Construction | 2025 |
| JAY Hunter Ltd | Construction | 2021 |
| JAY TEE Properties Limited | Construction | 2002 |
| Jcaf (Yorkshire) Ltd | Construction | 2025 |
| Jclb Limited | Extraterritorial | 1999 |
| JDL Electrical Ltd | Construction | 2019 |
| JDW Direct Ltd | Wholesale & retail | 2024 |
| JEM Roofing & Cladding Ltd | Construction | 2025 |
| JEN Connect Limited | Professional & scientific | 2023 |
| JMC Consult Ltd | Professional & scientific | 2026 |
| Jobman Workwear Limited | Extraterritorial | 1997 |
| John Cotton Fibres Ltd. | Extraterritorial | 1964 |
| Johnnygv Properties Ltd | Real estate | 2024 |
| Johnson Steel Limited | Manufacturing | 2013 |
| Johntrucks Ltd | Transport & logistics | 2026 |
| Jojo's Cakes and Crafts Ltd | Wholesale & retail | 2026 |
| Jonescat Limited | Construction | 2018 |
| Jossyn Limited | Transport & logistics | 2023 |
| Jrfirth.It Limited | Information & communication | 2017 |
| JSD Pharma Limited | Wholesale & retail | 2021 |
| JSM Properties (West Yorkshire) Ltd | Real estate | 2017 |
| Jubilee Gardens (Yorkshire) Management Company Limited | Households | 2022 |
| Jubilee Yorkshire Ltd | Administrative & support | 2019 |
| Jump Start Group Limited | Education | 2025 |
| Kalesi Limited | Information & communication | 2011 |
| Kangabay Limited | Administrative & support | 2019 |
| Karigans Limited | Professional & scientific | 2010 |
| Keckers Rail Limited | Construction | 2022 |
| Keep Your Feet Neat Limited | Health & social care | 2013 |
| Kenmore Caravans Limited | Wholesale & retail | 1970 |
| Kingfisher Yacht Ropes Limited | Extraterritorial | 2008 |
| Kirklees Local Television Limited | Information & communication | 2011 |
| Kitchen Know HOW Limited | Construction | 2019 |
| KJ Retail Fit-Outs Ltd | Construction | 2020 |
| Knowl Club Ltd. | Hospitality | 1887 |
| Knowl Park Gardens Management Company Limited | Real estate | 2022 |
| Knowles Estates Limited | Real estate | 1976 |
| Kraken Heating Solutions Ltd | Construction | 2020 |
| Kscs Consultancy Ltd | Professional & scientific | 2025 |
| Kullar Projects Ltd | Real estate | 2023 |
| L. M. Garage Ltd | Wholesale & retail | 2020 |
| LAB Bar & Kitchen Limited | Hospitality | 2024 |
| Lagentium Consulting Limited | Professional & scientific | 2024 |
| Langley Tower Ltd | Households | 2020 |
| Lasertronics (Business Machines) Limited | Extraterritorial | 1998 |
| Last Saloon Limited | Professional & scientific | 2014 |
| Lava Fluid Ltd | Hospitality | 2019 |
| LBW Trading Ltd | Transport & logistics | 2025 |
| LDW Pipeline & Process Testing Limited | Mining & quarrying | 2016 |
| Leadcrowd Limited | Information & communication | 2017 |
| Leasechain Property Management Limited | Households | 1986 |
| Lee's Logistics Limited | Transport & logistics | 2024 |
| Leeanna Services Ltd | Construction | 2024 |
| LEX Holdco Ltd | Financial services | 2026 |
| Lhhdent Ltd | Health & social care | 2019 |
| Lifes a Burger Ltd | Hospitality | 2020 |