Today's noteworthy upgrades include: AB InBev (BUD) upgraded to Buy from Hold at Berenberg... Air Lease (AL) upgraded to Overweight from Neutral at JPMorgan... Aircastle (AYR) upgraded to Neutral from Underweight at JPMorgan... AmTrust (AFSI) upgraded to Buy from Neutral at Compass Point... Anadarko (APC) upgraded to Focus List from Outperform at Scotia Howard Weil... BAE Systems (BAESY) upgraded to Neutral from Underweight at JPMorgan... Bill Barrett (BBG) upgraded to Outperform from Sector Perform at Scotia Howard Weil... Extra Space Storage (EXR) upgraded to Strong Buy from Outperform at Raymond James... Medtronic (MDT) upgraded to Conviction Buy from Buy at Goldman... Mylan (MYL) upgraded to Buy from Neutral at Citi... Scripps Networks (SNI) upgraded to Outperform from Underperform at CLSA... Toll Brothers (TOL) upgraded to Overweight from Neutral at JPMorgan... Wal-Mart (WMT) upgraded to Buy from Neutral at Northcoast... Weir Group (WEIGY) upgraded to Buy from Hold at Deutsche Bank... Weyerhaeuser (WY) upgraded to Outperform from Underperform at CLSA... Yelp (YELP) upgraded to Outperform from Sector Perform at RBC Capital.

Bullish option flow detected in Toll Brothers with 1,008 calls trading, 1.1x expected, and implied vol increasing over 1 point to 37.16%. 4/26 weekly 115 calls and 4/26 weekly 114 calls are the most active options, with total volume in those strikes near 320 contracts. The Put/Call Ratio is 0.54. Earnings are expected on May 21st.