| Period | NPK | S&P 500 | NASDAQ | vs S&P |
|---|---|---|---|---|
| 1D | -0.85% | -0.36% | -1.20% | -0.48% |
| 5D | -5.07% | +0.22% | +0.08% | -5.29% |
| 1M | -5.59% | -2.26% | -6.61% | -3.34% |
| 3M | -3.51% | -2.37% | -6.85% | -1.14% |
| 6M | -3.29% | +2.13% | -3.68% | -5.42% |
| YTD | +30.01% | +10.42% | +10.89% | +19.59% |
| 1Y | +46.68% | +12.27% | +11.67% | +34.41% |
| 3Y | +74.15% | +67.76% | +76.31% | +6.39% |
| 5Y | +57.26% | +61.39% | +72.29% | -4.13% |