In December 2025, the National Bureau of Economic Research published a study that made waves in the financial world: Congressional leaders — committee chairs and party leadership — outperformed rank-and-file members by up to 47% annually on their stock trades. Not 4.7%. Forty-seven percent.
This study was significant because it went beyond the well-known observation that Congressional stock trades outperform the market. It showed the outperformance is concentrated among members with the most legislative power. According to UC San Diego researchers, this pattern has persisted across multiple Congressional sessions, and public trust in Congressional trading practices is remarkably low.