Pre-Open Movers 5/26: (GES) (TIF) (SD) Higher; (EDE) (SIGM) (CSC) Lower (more...)

Below is a list of stocks making significant moves in pre-open trading Thursday.

HIGHER:
Clean Diesel Technologies Inc. (Nasdaq: CDTI) 50% HIGHER; Orders to Supply Diesel Retrofit Products for CARB Special Compliance Option
Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) 16% HIGHER; positive trial data
Guess?, Inc. (NYSE: GES) 12% HIGHER; strong Q1 results, guidance
hhgregg, Inc. (NYSE: HGG) 10% HIGHER; Q4 results
BioCryst (Nasdaq: BCRX) 9% HIGHER; positive trial data
Tiffany & Co. (NYSE: TIF) 5% HIGHER; strong Q1 results
SandRidge Energy, Inc. (NYSE: SD) 5% HIGHER; Files IPO for unit
Semtech Corp (NASDAQ: SMTC) 4% HIGHER; strong Q1 results, guidance
NetApp, Inc. (NASDAQ: NTAP) 3% HIGHER; strong Q4 results
Family Dollar (NYSE: FDO) 2.6% HIGHER; Positive hedge fund comments
Host Hotels & Resorts Inc. (NYSE: HST) 2% HIGHER; upgraded
American Eagle Outfitters, Inc. (NYSE: AEO) 2% HIGHER; upgraded
Microsoft Corporation (NASDAQ: MSFT) 1% HIGHER; Positive hedge fund comments, wants Ballmer out.
Brookdale Senior Living Inc. (NYSE: BKD) 1% HIGHER; upgraded
HJ Heinz Co. (NYSE: HNZ) 1% HIGHER; Q4 results

LOWER:
Empire District Electric Co. (NYSE: EDE) 19% LOWER; suspends dividends
Sigma Designs, Inc. (NASDAQ: SIGM) 9% LOWER; weak Q1 results
Rigel Pharmaceuticals, Inc. (NASDAQ: RIGL) 5% LOWER; stock offering
Computer Sciences Corporation (NYSE: CSC) 5% LOWER; weak Q4 results
Big Lots Inc. (NYSE: BIG) 4% LOWER; Q1 results, guides lower
Rovi Corporation (NASDAQ: ROVI) 3% LOWER; CEO to retire
RadioShack Corp. (NYSE: RSH) 2% LOWER; downgraded
Lululemon Athletica Inc. (NASDAQ: LULU) 2% LOWER; downgraded

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