Calls on Petrohawk Energy (HK) are seeing active trading. Total volume is running 7 times the usual, with 25,000 call contracts trading, or roughly five times the number of puts. The stock is up $3.87 to $28.82 in sympathy with Penn Virginia (PVA). Shares of Penn Virginia rallied $10 to $63.00 a share after the company announced that its first well in the Haynesvill Shale produced double the firm’s expectations. The news has positive implications for HK because the company has agreements to buy leasehold intersts in the same area. Comstock Resources (CRK) is also considered a play on the same theme.