I would flip things around a bit and ask what kind of information does his broker and let that guide you. If its mundane information, well there aren't a lot of "information brokers" in the mundane world, at least not as such. What you have are researchers, consultants, blackmailers, private investigators, mediums, bookies, brokers, stock analysts, insiders, forensic accountants, journalists, intelligence workers, etc.
So, what kind of information do you want him to trade?