 Matrix Service Co NASDAQ:MTRX was the target of a large decline in short interest in March. As of March 31st, there was short interest totalling 607,100 shares, a decline of 28.7 from the March 15th total of 851,600 shares. Based on an average trading volume of 251,200 shares, the days-to-cover ratio is presently 2.4 days. ... 