This one-day volume growth resulted in a record-breaking increase of 215%, as compared to the 65-Day Volume Moving Average. NPK's total volume now sits at 322.8K. The -2.30% price change was insignificant, leaving NPK's price at $148.58. This volume move could indicate a change in trend, and may be a buy signal for investors. A.I.dvisor found 36 similar cases, 29 of which were successful. Based on this data, the odds of success are +81%.