American Superconductor’s stock continues pullback, down 20% premarket

American Superconductor Corp.’s stock
AMSC,
-16.23%
continued its pullback Thursday, falling 20.2% in premarket trades. Shares of American Superconductor ended Wednesday’s session down 29%, snapping a five-day winning streak. The company’s stock surged recently on no apparent corporate news, although superconductor technology has been attracting plenty of attention following a claim by researchers in South Korea that they have discovered a room-temperature ambient-pressure superconductor. The research has generated both viral buzz and some skepticism, Scientific American reports.