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December 11, 2012  Tue 2:14 AM CT

CBI: SEE CHART GET CHAIN FIND STRATEGIES
Chicago Bridge & Iron has been running higher in recent weeks, and a large trader apparently expects the energy-services construction company to make a sharp move up or down.

optionMONSTER's Heat Seeker system detected the purchase of 10,000 January 43 calls in a single print for $0.65. The volume was well above the open interest of 1,548 contracts, so is clearly fresh buying.

Roughly 2 minutes after the options traded, 300,000 CBI shares were sold for $40.9167. The delta of the long calls would make the overall position market-neutral, looking for greater volatility as opposed to a particular direction. (See our Education section)

CBI finished the day up 0.36 percent at $41.25, bumping up against resistance that goes back to early May. Shares bounced off support around $37 in mid-November.
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The Movement of Delta

In our last column, we spoke about delta. You might remember that we discussed what delta was and what factors affected or changed delta. As you recall, we stated that three factors will have an effect on delta. They were movements of time, volatility, and underlying price. Today, we want to take a further look into the change of delta, this time focusing on change due to the movement in the underlying price. 

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