Increasing unusual option volume: BIRK SWBI CHK SRPT ACHR LXRX

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(NYSE: BIRK) Delayed: 37.48 -0.38 (1%)
Previous Close $37.86    52 Week High
Open $38.07    52 Week Low
Day High $38.33    P/E N/A 
Day Low $37.30    EPS
Volume 1,522,638