Intraday price change for ALXN is about $3.57 from the day's low to the day's high.
The previous business day's price range from the open of $126.59 is expected to range from a low of $124.62 to a high of $128.19.
Price moves beyond this range are outside the average.
The previous business day's closing price may be between $126.91 and $126.27 assuming average price movements.
Note that events including news, ALXN earnings, or broad market swings will unexpectedly affect price.
Closing prices outside of this range indicate a move outside the average closing price movement.