High Quality Content by WIKIPEDIA articles! Gate Petroleum is a privately held diversified corporation headquartered in Jacksonville, Florida, the 11th largest in Florida in 2010. In FY 2008, the company ranked #338 on the Forbes list of America`s Largest Private Companies. According to Forbes, it had sales of $1.44 billion and employed approximately 3,500 people, while Jacksonville Business Journal indicated 2,200 employees in that same year.