| Jayne Hopton PR Limited | Professional & scientific | 2015 |
| Jazz Hands (Yorkshire) Ltd | Professional & scientific | 2024 |
| JBG Commercial Properties Ltd | Real estate | 2020 |
| JDB Properties Limited | Professional & scientific | 2016 |
| Jeal & Co. Limited | Professional & scientific | 2002 |
| Jersey Cider Company Limited | Extraterritorial | 1993 |
| Jesmond Property Limited | Real estate | 2025 |
| Jetplay Consulting Ltd | Information & communication | 2003 |
| Jewellery and Fine Watches UK Limited | Wholesale & retail | 2017 |
| Jgoodrick Property Ltd | Real estate | 2017 |
| JHW Storage Limited | Transport & logistics | 2024 |
| Jjt's Limited | Other services | 2016 |
| JLR Properties Limited | Real estate | 2022 |
| JMC Project Management Ltd | Professional & scientific | 2025 |
| Jmca Limited | Professional & scientific | 2009 |
| JMM Agriculture Limited | Agriculture & fishing | 2020 |
| JO Clark Limited | Professional & scientific | 2024 |
| John Petty Services Limited | Administrative & support | 1994 |
| John Wilding Limited | Wholesale & retail | 1972 |
| Jonathan Ziff Implants Limited | Health & social care | 2009 |
| Jonathan Ziff Property Ltd | Real estate | 2021 |
| Jorebor Properties Limited | Real estate | 2025 |
| JRS Fisheries Limited | Hospitality | 2012 |
| JSB Engineering Solutions Ltd | Professional & scientific | 2025 |
| Jsfr Consulting Ltd | Professional & scientific | 2016 |
| Jubilee Consumables Limited | Administrative & support | 2022 |
| Just Beautiful Properties Ltd | Real estate | 2021 |
| Jzsubs Ltd | Hospitality | 2018 |
| K2 Design & Fabrication Ltd | Manufacturing | 2016 |
| Kanda Renovations Limited | Construction | 2021 |
| Kastronix Holdings Ltd | Financial services | 2024 |
| Kastronix Limited | Wholesale & retail | 2005 |
| Kdsdk Investments Limited | Professional & scientific | 2016 |
| Keal and ROE Limited | Construction | 2022 |
| Kelly Teggin Hairdressing Ltd | Other services | 2007 |
| Keperra Limited | Professional & scientific | 2018 |
| KG Property Enterprises Ltd | Hospitality | 2018 |
| KG Property Estates Ltd | Real estate | 2025 |
| King's Professional Properties Ltd | Real estate | 2019 |
| King's Property Group Ltd | Professional & scientific | 2019 |
| Kingfisher Services (Yorkshire) Ltd. | Professional & scientific | 2019 |
| Kings Diamonds Limited | Wholesale & retail | 2026 |
| Kipp K Ltd | Other services | 2022 |
| Kirsty Hairdressing Limited | Other services | 2014 |
| Kitchens of Harrogate Ltd | Manufacturing | 2025 |
| Kitson Property Development Limited | Hospitality | 2000 |
| KK Realty Ltd | Real estate | 2025 |
| KKC Retail Limited | Construction | 2019 |
| KKH 2019 Limited | Wholesale & retail | 2023 |
| KMH Agents Ltd | Wholesale & retail | 2024 |
| Knaresborough and District Chamber Limited | Other services | 2022 |
| Knaresborough and District GUN Club Limited | Arts & recreation | 2014 |
| Knaresborough and Harrogate Community Support Services Limited | Professional & scientific | 1997 |
| Knaresborough Celtic Football Club Limited | Arts & recreation | 2006 |
| Knaresborough Consulting Ltd | Professional & scientific | 2016 |
| Knaresborough Cottages Limited | Real estate | 2022 |
| Knaresborough Cuts Ltd | Other services | 2024 |
| Knaresborough Electrical Ltd | Construction | 2024 |
| Knaresborough Graphics Ltd | Professional & scientific | 2019 |
| Knaresborough Greengrocers Limited | Wholesale & retail | 2023 |
| Knaresborough Kitchens Limited | Construction | 2019 |
| Knaresborough Machinery Holdings Ltd | Administrative & support | 2023 |
| Knaresborough Technology Park Limited | Professional & scientific | 2001 |
| Knaresborough Window Cleaners Ltd | Administrative & support | 2023 |
| KT Childcare Limited | Education | 2014 |
| Kyme Properties Limited | Real estate | 2005 |
| L & J’S Property Ltd | Real estate | 2021 |
| L&D Williams Ltd | Administrative & support | 2025 |
| LA Maisonette Ltd | Households | 2014 |
| Labsave Limited | Extraterritorial | 2012 |
| Lamb and Flag Enterprises Limited | Real estate | 2018 |
| Lamc Independent Consultant Limited | Health & social care | 2015 |
| Lanbaoshi Ltd | Hospitality | 2026 |
| Langdale Group Ltd | Professional & scientific | 2023 |
| Larock Construction Limited | Construction | 2006 |
| Lateral (Thorpe Park) Limited | Real estate | 2007 |
| Lateral Asset Management LLP | | 2020 |
| Lateral Investment Management Limited | Real estate | 2010 |
| Lateral Private Client Ltd | Professional & scientific | 2021 |
| Lateral Property Developments Limited | Real estate | 2012 |
| Lateral Property Group Limited | Real estate | 2009 |
| Lateral Property LLP | | 2013 |
| Lateral Property Services Limited | Real estate | 2010 |
| Lateral Property Ventures Limited | Real estate | 1985 |
| Laura's Beau Limited | Manufacturing | 2003 |
| Lawai Spice HG5 Ltd | Hospitality | 2025 |
| Lawton Brook (Marketing) Limited | Wholesale & retail | 2012 |
| Lawton Brook Limited | Wholesale & retail | 1998 |
| Lazy Tiger Limited | Professional & scientific | 2012 |
| LC Enterprises Ltd | Other services | 2026 |
| Lead-Talent Limited | Professional & scientific | 2012 |
| Leasewise Limited | Financial services | 2009 |
| Ledger Leaf Ltd | Professional & scientific | 2025 |
| Leeds, That! Ltd | Wholesale & retail | 2025 |
| Lend US a Tenner Limited | Extraterritorial | 2012 |
| Leons Butchers (Knaresborough) Ltd | Wholesale & retail | 2025 |
| Leopard Risk Management Ltd | Financial services | 2012 |
| Lester & Ford Solutions Ltd | Information & communication | 2005 |
| Liam Horsfall Ltd | Construction | 2026 |
| Lido Leisure Parks Limited | Hospitality | 2014 |