SUPN...$5.03 Definitely on watch here. 50K in volume is above avg. for this thinly traded biotech. 10 day avg volume is 39,000 shares. $5.03 bid seems pretty solid as I agree that it gets hit and then reloads.
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$SUPN someone wants shares @5.02
The bid is getting hit and they just keep reloading it :) 21x3 again