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September 19, 2012  Wed 9:50 AM CT

CBS: SEE CHART GET CHAIN FIND STRATEGIES
CBS has been on a scorching run for years, but one trader is betting on a small pullback by the end of the week.

optionMONSTER's Depth Charge system detected the purchase of 2,000 September 37 puts for $0.41 to $0.47 in 4 minutes this morning. Open interest was 606 contracts at the start of the session, so this is new buying.

CBS is fractionally higher today at $36.62, apparently stalling at resistance around $37 this month. The media company is up more than tenfold since trading near $3 in March 2009 at the height of the financial crisis.

The long puts would turn a profit if the stock falls modestly from today's levels by expiration at Friday's close. The volume isn't huge, but overall puts do outnumber calls in the name by nearly 7 to 1 so far. (See our Education section)
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The Strike-Based Greeks

The other Greeks (Gamma, Vega, and Theta) are calculated by using month and strike data, and not by individual option. These are called strike-based Greeks. Gamma, Theta, and Vega are all strike-based Greeks

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