This is pretty typical Fed Day action, when traders do some quick trades while they wait.
Sarepta Therapeutics, Inovio Pharmaceuticals and Mylan were among the biotech movers in premarket trading on July 20.
Akebia Therapeutics, Sarepta Therapeutics and Esperion Therapeutics were among the biotech stock movers in premarket trading on June 29.
The S&P 500 and Dow slip on a crude oil slump.
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