Union Pacific (NYSE: UNP), a leading transportation company, closed at $120.92. UNP overall option implied volatility of 33 is above its 26-week average of 29 according to Track Data, suggesting larger price risks.

Burlington Northern (NYSE: BNI), an operator of 32,000 railroad route miles, closed at $80.77. BNI overall option implied volatility of 34 is above its 26-week average of 29 according to Track Data, suggesting larger price fluctuations.

Canadian National (NYSE: CNI) closed at $46.36. CNI overall option implied volatility of 33 is above its 26-week average of 26 according to Track Data, suggesting larger price fluctuations.

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

MOST NOTEWORTHY: Sunpower (SPWR), U.S. Steel Group (X), Sysco Corp (SYY), Safeway (SWY), Performance Food Group (PFGC) and Kroger (KR) were today's noteworthy downgrades:

• Sunpower Corp (NASDAQ: SPWR) was downgraded to Buy from Strong Buy at Needham and to Neutral from Buy at Merrill Lynch, both based on valuation.

• U.S. Steel Group (NYSE: X) was downgraded to Neutral from Outperform at Credit Suisse on valuation.

• Sysco Corp (NYSE: SYY), Safeway Inc (NYSE: SWY), Performance Food Group (NASDAQ: PFGC) and Kroger (NYSE: KR) were downgraded to Hold from Buy at BB&T Capital. The firm expects higher food cost inflation to impact near-term real sales growth and margins industry-wide...

OTHER DOWNGRADES:

• Merrill Lynch downgraded shares of Huntington Bancshares (NASDAQ: HBAN) to Sell from Neutral following the company's Q2 report.

• Hershey (NYSE: HSY) was downgraded to Peer Perform from Outperform at Bear Stearns.

• Matrix downgraded shares of Park Electrochemical (NYSE: PKE) to Buy from Strong Buy and shares of Canadian National (NYSE: CNI) to Hold from Buy.

• Lehman Brothers downgraded shares of Williams Scotsman (NASDAQ: WLSC) to Equal Weight from Overweight.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).