Top Pre-Market Stock Upgrades/Downgrades May 5, 2010

Here is a list of this morning’s top companies upgrades, downgrades, and initiations by brokerage firms. Upgrades: American Medical Systems (AMMD) upgraded to Buy from Hold at Stifel Nicolaus; price target $23 DTS (DTSI) upgraded to Hold from Sell at Collins Stewart Elan (ELN) upgraded to Neutral from Sell at UBS Electronic Arts (ERTS) upgraded to Neutral from Underweight [...]