Express Scripts (NASDAQ: ESRX) March weekly call option implied volatility is at 34, March is at 29, April is at 28; compared to its 52-week range of 19 to 44 into Cigna (CI) acquiring in cash, stock transaction valued at about $67B. Call put ratio 1 call to 3.5 puts compared to its 90 day average of 1.23 calls to 1 put.