According to the ETF Finder at ETF Channel, SRPT makes up 2.59% of the SPDR S&P Biotech ETF (XBI) which is lower by about 0.7% on the day Friday.
In afternoon trading Friday, SRPT was down about 0.2% on the day.
The S&P 500 and Dow slip on a crude oil slump.
Stocks are mixed as energy lags, health care leads.
Jim Cramer takes a closer look at Sirius XM Radio, Shopify, Teledoc, Sarepta Therapeutics, Pilgrim's Pride.
It's not about fashion missteps, says Jim Cramer. Who cares what the products look like if there's no one in the stores?