| Integrated Electrical Projects Limited | Construction | 2013 |
| Integrated Mechanical Limited | Construction | 2006 |
| IP (in Phase) Electrical Engineers Ltd | Construction | 2020 |
| Iroam Motorhomes Ltd | Hospitality | 2021 |
| IS Electrical Contractors Ltd | Construction | 2024 |
| Italian Locking Systems Limited | Administrative & support | 2019 |
| Iztex Ltd | Wholesale & retail | 2007 |
| J Geraghty Limited | Construction | 2014 |
| J H Engineers Ltd | Manufacturing | 2014 |
| J M Properties (Halifax) Limited | Real estate | 2021 |
| J M R Legal Limited | Professional & scientific | 2017 |
| J S Joinery & Timberframe Ltd | Construction | 2017 |
| J. & P. Steele Houses Limited | Real estate | 1999 |
| J. & P. Tooling Limited | Manufacturing | 2003 |
| J. R. Pizza Bar (Rochdale) Ltd | Hospitality | 2019 |
| J.L.G. and Associates Limited | Health & social care | 2015 |
| J.M.V. Contracts Limited | Manufacturing | 2010 |
| Jacq Ltd | Health & social care | 2022 |
| Jaques Plumbing and Heating Ltd | Construction | 2012 |
| JB Leisure Industry Ltd | Hospitality | 2019 |
| JBF Group Products Ltd | Manufacturing | 2021 |
| JC Health and Fitness Ltd | Arts & recreation | 2014 |
| JC Sports and Nutrition Academy Ltd | Education | 2023 |
| JIM & Jones Creative Limited | Professional & scientific | 2021 |
| Jimmy's Hullabaloo Ltd. | Hospitality | 2015 |
| JL Family Co Limited | Financial services | 2019 |
| Jlbm Holdings Ltd | Financial services | 2024 |
| Jledesign Ltd | Professional & scientific | 2012 |
| JLM Holdings (Halifax) Limited | Financial services | 2025 |
| JNL Auto Wholesalers Ltd | Wholesale & retail | 2019 |
| Jobs in Food Ltd | Education | 2015 |
| Jodana House Management Company Limited | Real estate | 2002 |
| John Trafford Metal Spinners Limited | Manufacturing | 2024 |
| JR Consultancy Services Limited | Information & communication | 2022 |
| JRJ Foods Limited | Manufacturing | 2019 |
| Julie Crane Properties Ltd | Construction | 2013 |
| Just Go Camper Hire Limited | Administrative & support | 2021 |
| JW Athletics Ltd | Arts & recreation | 2024 |
| K & B Beauty Ltd | Other services | 2021 |
| K & C M Mager Properties Limited | Real estate | 2007 |
| K & D Decorating Services Limited | Construction | 2024 |
| K D Knitwear Ltd | Wholesale & retail | 2011 |
| K N P Roadmarking Limited | Construction | 2020 |
| K N Storage & Distribution Limited | Transport & logistics | 2013 |
| K T Hydraulics Limited | Manufacturing | 1985 |
| K-Med Consulting Ltd | Professional & scientific | 2025 |
| K-Vale (Management Company) Limited | Households | 2020 |
| K.W. Fire Protection Limited | Manufacturing | 2003 |
| Kai's Takeaway Ltd | Hospitality | 2018 |
| Karpaty Bakery Limited | Manufacturing | 2017 |
| Katie & Co Pet Services Ltd | Administrative & support | 2020 |
| Kaye Property Partnership Ltd | Real estate | 2013 |
| KD and Gray Properties Ltd | Real estate | 2025 |
| KDN Fire Protection Ltd | Professional & scientific | 2012 |
| Keir Woodward Travel Limited | Administrative & support | 2013 |
| Kexborough House Care Home Limited | Health & social care | 2017 |
| Keystones Retaining Systems Ltd | Construction | 2025 |
| KF Collective Ltd | Professional & scientific | 2026 |
| KG Retaining Walls Ltd | Construction | 2021 |
| Kickstart Scooter Competitions Limited | Wholesale & retail | 2025 |
| Kiddie Cats Limited | Education | 2015 |
| Kilnsey Leisure Limited | Construction | 1981 |
| King Cross Cricket Bowling & Athletic Club Limited | Hospitality | 2015 |
| Kingfisher Chase Management Limited | Households | 2005 |
| Kingsland Limited | Construction | 2003 |
| KJ BA Consultancy Ltd | Information & communication | 2023 |
| KJ Installations Ltd | Construction | 2014 |
| Knife Sharp Ltd | Manufacturing | 2020 |
| Knowle Lodge Management Co. Ltd | Households | 2004 |
| KPJ Properties Limited | Real estate | 2016 |
| Krazy Kidz Ltd | Arts & recreation | 2014 |
| KS Two Consulting Ltd | Professional & scientific | 2019 |
| KTH Engineering Group Limited | Professional & scientific | 2010 |
| Kumar Fisheries Limited | Hospitality | 2024 |
| Kumars Estates Limited | Real estate | 2019 |
| Kytes Construction Limited | Construction | 2015 |
| L & P Fire Safety Equipment Limited | Other services | 2002 |
| L & R Property (Halifax) Ltd | Real estate | 2020 |
| L Honney Limited | Professional & scientific | 2023 |
| L Honney Property Ltd | Real estate | 2024 |
| L R Bury Ltd | Construction | 2022 |
| L S Fire Group Limited | Other services | 2014 |
| L&E Property Holdings Ltd | Construction | 2026 |
| L.W. Safety Limited | Other services | 1978 |
| Ladywood Services Ltd | Construction | 2017 |
| Lambe Planning and Design Limited | Professional & scientific | 2012 |
| Lambert Roper & Horsfield Limited | Professional & scientific | 2000 |
| Landown House Management Company Limited | Households | 2004 |
| Landown Limited | Construction | 1992 |
| Lapis Consulting Services Ltd | Information & communication | 2021 |
| Larvin Group Limited | Financial services | 2023 |
| Lashes, Aesthetics & Piercings by Clare Ltd | Other services | 2025 |
| Layer 7 Properties Ltd | Real estate | 2025 |
| Layer 7 Software Limited | Information & communication | 2018 |
| Leeds Food Limited | Hospitality | 2021 |
| Leeds Market Grocers Ltd | Wholesale & retail | 2018 |
| Legacy Property Rentals Limited | Real estate | 2020 |
| Legend Communications Limited | Information & communication | 2020 |
| Leisure Glow Limited | Extraterritorial | 2021 |
| Lenvia Capital Ltd | Real estate | 2025 |