Electronic Arts ( EA ) was upgraded at Needham from Hold to Buy. $22 price target. Strong sales growth can expand margins, Needham said. Goldman Sachs ( GS ) was downgraded to Hold at TheStreet Ratings. HSN ( HSNI ) was upgraded at Citigroup to Buy from Neutral. $42.50 price target. Compelling valuation and accelerating buyback, Citi said. Louisiana-Pacific ( LPX ) was upgraded at Deutsche Bank from Hold to Buy. $12 price target. Housing demand is beginning to recover, Deutsche said. Mako Surgical ( MAKO ) was downgraded at William Blair to Market Perform. Estimates were also cut, given the company's new guidance, William Blair said. Millennial Media ( MM ) was initiated with an Equal-weight rating at Morgan Stanley. Valuation call, Morgan Stanley said. NYSE Euronext ( NYX ) was upgraded at Stifel Nicolaus from Sell to Hold. Valuation call, Stifel Nicolaus said.