• J A Boland Group (Boland Motor Group)
• JMK Group
• JacksonStone Recruitment
• Jacobs Engineering Group Inc
• Jaguar Land Rover
• Jigsaw – The National Centre for Youth Mental Health
• JobContax Recruitment Agency
• Joe Duffy Group
• John Sisk & Son
• Johnson & Johnson
• Johnson Controls, Inc.
• Johnstown Estate Hotel & Spa
• Johnstown Garden Centre
• Jones Engineering
• Jpmorgan Chase
• Jump Juice Bars Ltd
• Junction 14 Mayfield
• Just Eat