Sandridge Energy (SD), an Oklahoma City based oil and gas drilling co., is up 66 cents to $12.38 and has added 8 percent since buyers of Sept 12.5 calls surfaced in the name Monday. Today, options volume is running 4X the expected for midday and activity is being seen in Sep 15, Sep 12.5, and Dec 17.5 calls. 4,400 calls traded total, compared to 810 puts, and directional sentiment based on the total order flow is 75 percent bullish.