Group 1 - Morgan Stanley downgraded Freeport-McMoRan (FCX.US) and Teck Resources (TECK.US) from "Overweight" to "Hold," with target prices set at $54 and $44 respectively [1] - The performance of copper stocks covered by Morgan Stanley has outpaced LME copper prices by 28 percentage points since April 8, making the risk/reward profile less attractive [1] - Analysts believe Freeport-McMoRan has upside potential due to its exposure to Comex copper and strong gold prospects, but the current risk/reward ratio appears unattractive with few short-term catalysts [1] Group 2 - Morgan Stanley downgraded Southern Copper (SCCO.US) from "Hold" to "Underweight," setting a target price of $99, citing that the stock's valuation seems high relative to historical averages and industry peers [2] - The firm also downgraded Nexa Resources (NEXA.US) from "Hold" to "Underweight," with a target price of $5, due to pessimistic expectations regarding zinc prices and operational issues affecting production targets [2]