http://finance.yahoo.com/news/Traders-h ... 9.html?x=0
Petrobras has been dropping like a rock, but one investor expects a bounce.
optionMONSTER's Heat Seeker tracking system detected the purchase of more than 9,000 January 26 calls, most of which priced for $0.85. Volume was 5 times open interest in the strike.
A single block of 7,000 contracts accounted for most of the activity, followed by a large stock buy. This suggests that the dealer who sold the calls hedged their exposure in the shares, which confirms that the sentiment was bullish.

