Upgrades:
Stifel Nicolaus upgrades Yahoo (YHOO) to Buy from Hold and sets target price at $25.
Downgrades:
Merck (MRK) downgraded to Mkt Perform from Outperform at Leerink Swann
Merck (MRK) downgraded to Underweight from Equal-Weight at Morgan Stanley
JPMorgan downgrades Wal-Mart (WMT) to Neutral from Overweight and lowers its price target on shares to $75
Chevron (CVX) downgraded from Buy to Neutral at UBS
Other:
Wunderlich raises their Walt Disney (DIS) target to $58 from $50
Oppenheimer raises their Cisco (CSCO) target to $24 from $22