| Instant Investment Yorkshire Limited | Real estate | 2023 |
| Integrated Energy Management Solutions Ltd | Professional & scientific | 2010 |
| Integrity Home Care Ltd | Health & social care | 2013 |
| International Hail Repairs Limited | Wholesale & retail | 2011 |
| Intruder Alarms Services Limited | Administrative & support | 1998 |
| Invent Systems Limited | Professional & scientific | 2004 |
| Inventair Limited | Manufacturing | 2000 |
| Istore Classics Limited | Transport & logistics | 2017 |
| IT Benching Ltd | Manufacturing | 2011 |
| J & E Takeaway Limited | Hospitality | 2024 |
| J & R Morley Limited | Agriculture & fishing | 2004 |
| J & R Plumbing and Heating (Yorkshire) Limited | Construction | 2013 |
| J and C James Limited | Construction | 2001 |
| J Braschler Properties Ltd | Households | 2021 |
| J D R Initiatives Limited | Real estate | 2016 |
| J Grebby Properties Ltd | Real estate | 2026 |
| J H Boynton & SON (Farm) Ltd | Agriculture & fishing | 2014 |
| J H Tennant Renewables 2007 Limited | Administrative & support | 2007 |
| J K (Roofing) Limited | Construction | 2010 |
| J Obyrne Tiling Limited | Construction | 2024 |
| J Preston Developments Limited | Real estate | 2024 |
| J Stephenson & Partners Limited | Agriculture & fishing | 2023 |
| J W Pudsey & SON Limited | Wholesale & retail | 2003 |
| J W Williamson & Sons Ltd | Agriculture & fishing | 2022 |
| J.C. Robinson Limited | Agriculture & fishing | 2003 |
| J.D. Marine (Bridlington) Limited | Manufacturing | 1999 |
| J.G.Gardiner Limited | Construction | 1933 |
| J.R.Gardiner Limited | Agriculture & fishing | 1962 |
| J.S.E. Property Maintenance Ltd. | Construction | 2015 |
| J.S.E. Resin Solutions Ltd | Construction | 2025 |
| Jackson Construction & Civils Limited | Construction | 2024 |
| Jackson Construction Consultants Ltd | Construction | 2022 |
| Jackson Electrical Services Limited | Mining & quarrying | 2013 |
| Jackson Fisheries Ltd | Hospitality | 2019 |
| Jaiip Spice Ltd | Hospitality | 2020 |
| James H. Tennant Limited | Agriculture & fishing | 1987 |
| James K&S Ltd | Health & social care | 2024 |
| James Stockdale Limited | Agriculture & fishing | 1955 |
| James Tennant 1992 Limited | Agriculture & fishing | 1992 |
| Janurelle Ltd | Wholesale & retail | 2024 |
| JAS Land Rovers Ltd | Wholesale & retail | 2012 |
| Jasmine Clough Ltd | Information & communication | 2021 |
| Jason Shields Ltd | Transport & logistics | 2007 |
| JB & BC Arms Bridlington Ltd | Hospitality | 2025 |
| JBC Holdings Limited | Financial services | 2017 |
| JBE Properties (Ryedale) Limited | Real estate | 2025 |
| Jblamzcourier Ltd | Transport & logistics | 2024 |
| JC Properties East Riding Ltd | Households | 2025 |
| JC Services East Riding Ltd | Construction | 2024 |
| JCB Solutions Limited | Professional & scientific | 2021 |
| JD Livestock Ltd | Agriculture & fishing | 2023 |
| Jdlpml Trading Ltd | Wholesale & retail | 2025 |
| JDP Joinery Ltd | Construction | 2004 |
| Jenkinson & COX Ltd | Wholesale & retail | 2008 |
| Jeromes Coffee Shop 2 Limited | Hospitality | 2023 |
| Jeromes Coffee Shops Limited | Hospitality | 2013 |
| Jetbike (Group) Limited | Manufacturing | 2026 |
| Jewellers Academy Online Tuition Limited | Information & communication | 2024 |
| Jewitt Developments Limited | Real estate | 2025 |
| JF Electrical Ltd | Construction | 2003 |
| JG Marine and Ports Ltd | Professional & scientific | 2021 |
| JHL Buildings Limited | Construction | 2019 |
| Jimmys Properties Limited | Real estate | 2003 |
| Jjlh Group Ltd | Manufacturing | 2025 |
| JKL Rail Limited | Transport & logistics | 2022 |
| JMB Holdings North Limited | Financial services | 2023 |
| JMS Properties Bridlington Ltd | Real estate | 2024 |
| JOE Franks Joinery Limited | Construction | 2013 |
| John Bull (Confectioners) Limited | Manufacturing | 1976 |
| John E Marshall Motor Engineers Limited | Wholesale & retail | 2004 |
| John LEE Construction Services Limited | Professional & scientific | 2018 |
| John Ling (Bridlington) Limited | Professional & scientific | 1975 |
| John Makin Limited | Agriculture & fishing | 1964 |
| John Nicholas Limited | Other services | 2002 |
| Johnson Joinery UK Limited | Construction | 2018 |
| Johnson's Bespoke Imprinted Concrete and Groundworks Limited | Construction | 2021 |
| JON Tindall Builder Ltd | Construction | 2013 |
| Jora Industries Limited | Administrative & support | 2025 |
| Joseph W Wright Limited | Manufacturing | 2025 |
| JPL Consulting & Services Ltd | Education | 2019 |
| JR Hill Ltd | Hospitality | 2015 |
| JRJ Watson Ltd | Administrative & support | 2017 |
| Jskb Solutions Ltd | Construction | 2016 |
| Juicepoint UK Charging Ltd | Administrative & support | 2025 |
| Just Build (Yorkshire) Limited | Construction | 2014 |
| Just Direct Housing Ltd | Real estate | 2022 |
| K & S Read Transport Solutions Limited | Transport & logistics | 2014 |
| K Capital Trading Limited | Education | 2026 |
| K Nield Ltd | Other services | 2020 |
| K.K. Huddleston & Sons Limited | Agriculture & fishing | 1985 |
| Kadis Construction Limited | Construction | 2018 |
| Kaleida Life Limited | Health & social care | 2025 |
| Kany FC Ltd | Hospitality | 2025 |
| Karakus Property Ltd | Real estate | 2025 |
| Karinya Developments Limited | Construction | 2004 |
| KB Stoves Ltd | Construction | 2021 |
| KC Coastal Valeting Ltd | Administrative & support | 2026 |
| Kefalonia by US Ltd | Professional & scientific | 2020 |
| Keith Gray Joinery Ltd | Construction | 2006 |
| Kelk Developments Limited | Construction | 2026 |