Scalpers are daytraders who normally sell quick run-up for 5 or 10% gains. HYGN is a perfect play for these type of traders, who may buy in at the bid/ask (as momentum turns the pps) and then sell into an upward surge at the ask for quick gains.
They are normally very good and well experienced traders. theres alot of slippage in HYGN at times, which makes it difficult, but profitable due to this volatile movement
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