Director Reuben Leibowitz bought $113K in SPG shares at $223.38, increasing his stake by 0.9% and continuing his pattern of quarterly purchases. This trade gains significance from the cluster of 6 other insiders buying $238K worth of shares, showing broad insider confidence near the stock's 90-day high.

Where it could go — 70% of similar setups → stock higher at 90d; watch $228.58 as the bull trigger, $200 as the bear break.