Hull founded Hull Trading Company in 1985 and served as the firm's Chairman and chief executive officer before selling it to Goldman Sachs in 1999 for $531 million. The company, which leveraged technological innovations and quantitative models, was one of the world's premier market-making firms, trading on 28 exchanges in nine countries. Hull went on to found Hull Investments, LLC in 1999 which serves as a family office for three generations of the Hull family, and acts as parent company to a number of financial entities. In 2009, Hull founded Ketchum Trading, LLC, a proprietary trading firm that traded and provided liquidity in futures, options, cash equities and exchange-traded funds. And in 2013, Hull created Hull Tactical Asset Allocation, LLC. HTAA operates an actively managed ETF and utilizes advanced algorithms as well as macro and technical indicators to anticipate future market returns.