Insider selling fell by more than half to $2.10 billion in the week of August 24, the lightest week since July 20, and reported buying nearly doubled to $658.7 million. The composition undercuts both numbers. Bill Gates’s Cascade Investment took $306.1 million of Republic Services for a third straight week, and Ernesto Bertarelli bought a $219.0 million block of Madison Air at $24.97 on a day a director of the same company paid $27.84 in the market.