It has been demonstrated mathematically that ~5% of all trades show evidence of insider knowledge - pertinent information not yet released to the public.

This is Trump keeping the loot in the family, instead of letting every congresscritter and his "wife, mistress and fifteen best friends" join the feeding frenzy.

In the USA, congresscritter have a loophole letting them do this. Nancy Pelosi was the most whale-watched.

In the West outside the US of A, the rule of law is so feeble the politicians don't bother with a loophole.

This is how the rich-but-not-superrich steal.