Not while in office for most of them. Those that do already had those opportunities. They don't get the good payday until they retire and do lobbying or consulting.
I was prepared to dispute this, but now I'm not certain. According to capitoltrades.com, a site that tracks US politician stock trades, 213 politicians made trades within the last 3 years. Assuming those are senators and congress members, then it's fair to say that most aren't making trades.
That said, the GP comment that asserted "their power and insider knowledge makes them a lot more than that overall" isn't incorrect. 213 politicians take advantage of their elected positions to profit from the stock market.
