yesterdays VWAP was around $4.69, so one would assume that the 80,927 shares were shorted around those levels...... With volume traded in the $4.60 - $4.40 range totaling only a measly 15,000 I highly doubt whether someone shorting such a stock like ACX can actually make any money due to the reduced liquidity....
ACX would have one of the smallest free floats going around with the top 20 holding around 74% of the stock.... this coupled with a growth profile that could see revenue growth grow every qtr for many many years is a recipe for much higher prices and continued buying interest.....
Demand has been quite strong for this stock, ie every time it dips someone steps up to the plate, so the shorters have to compete with these buyers when it comes to covering .......