Insider trading has been rife on Wall Street, academics conclude – In the know

https://www.economist.com/news/finance-and-economics/21736561-one-study-suggests-insiders-profited-even-global-financial-crisis-another

Common to all the papers is the recognition that the public markets are, as conspiracy theorists have long argued, not truly public at all. Changing the law to fix that may not even be feasible.