Top Pre-Market Upgrades/Downgrades: RST, EXPD, LVS, NVAX, MRO, UHS, JNPR

Rosetta Stone Inc. (RST) – Reported weak earnings and guided lower. daily chart is coming off sharply – 2004 daily lows Expeditors Internation of Washington (EXPD) – upgraded to Buy from Neutral at UBS – upgraded Expeditors International based on valuation. Price target – raised to $59 from $55. Las Vegas Sands Corp. (LVS) – [...]