SLM Corp. (NYSE: SLM) Cut to Neutral at Ladenberg Thalmann. Texas Instruments (NYSE: TXN) Raised estimates but Maintained Sell at Auriga. UnitedHealth Group (NYSE: UNH) Raised to Conviction Buy List at Goldman Sachs. United States Steel (NYSE: X) Cut to Buy from Conviction Buy at Goldman Sachs. Zimmer Holdings (NYSE: ZMH) Started as Buy at Jefferies.