Chesapeake Energy (NYSE: CHK) closed at $45.25 Monday. Natural Gas futures are recently down 2.25% to $8.53 according to Bloomberg. BMO Capital Markets has a $68 target price on CHK. CHK September option implied volatility of 61 is above its 26-week average of 42 according to Track Data, suggesting larger price movement.

SPDR Gold Trust (NYSE: GLD), a commodity-based exchange traded security, closed at $86.84. Gold is recently trading down 1.70% to $892.50. GLD option volume was heavy on August 4, 2008 with 106,112 contracts trading. GLD over all option implied volatility of 25 is near its 9-week average according to Track Data, suggesting non-directional price movement.

Companhia Vale do Rio Doce (NYSE: RIO) will report Q2 EPS on August 6. RIO, a Brazilian mineral company, closed at $26.36. Goldman has a Buy rating on RIO. RIO option volume was heavy on August 4, 2008, with 237,545 contracts trading. RIO August option implied volatility is at 66, September is at 56; above its 26-week average of 49 according to Track Data, suggesting larger price movement.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com