Premarket roundup: Martha Stewart, Biofuels

NEW YORK (AP)--A JPMorgan analyst downgraded shares of Martha Stewart Living Omnimedia Inc., citing a difficult advertising environment and the recent departure of Chief Executive Susan Lyne.

NEW YORK (AP)--Some small to mid-size ethanol producers might have to shut down over the next few months as corn prices jump after severe floods pounded the Midwest, a Citi Investment Research analyst said Thursday.

NEW YORK (AP)--A Lehman Brothers analyst said Thursday that LifePoint Hospitals Inc. is struggling to raise patient admissions and recruit new doctors, and he downgraded the hospital operator's stock.