JP Morgan's $2 per share take over of Bear Stearns is a 93% discount from Bear's closing price of $30 on Friday and 99% of its 52 week high. On the open, Bear is down 87%. Prior to today, the biggest one day loss of current S&P members was 75% for Sealed Air Corp in 1989.
Here are the biggest 1 day percentage drops of the S&P 500 constituents.