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NEW YORK -- Express Scripts (ESRX) has been a monster, and bullish option traders cleaned up quick Tuesday. 

OptionMonster's Heat Seeker program detected heavy call volume in the provider of pharmacy benefits, with a block of 8,200 January 80s sold for $3.45 and an equal number of January 84s bought for $1.10. Volume was below open interest at the lower strike, which indicates that an existing position was rolled to the higher strike. 

Long calls lock in the price where investors can buy a stock, which lets them position for a rally at limited cost. Capital can be moved from one contract to another, locking in profits as shares advance. That's what happened Tuesday, allowing the trader to immediately recover $2.35. 

Gains continued in the January 84s because ESRX soon pushed higher, and those calls more than doubled to $2.85. 

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Express Scripts ended the session up 4.31% to $85.88. The stock has been rebounding after holding a key support level from March earlier in the month. 

Overall option volume was eight times greater than average, with calls accounting for more than four-fifths of the total. 

-- Written by David Russell of  OptionMonster

Russell has no positions in ESRX.