| Period | NPK | S&P 500 | NASDAQ | vs S&P |
|---|---|---|---|---|
| 1D | +0.66% | +0.41% | +0.55% | +0.25% |
| 5D | +2.41% | +1.33% | +1.88% | +1.07% |
| 1M | +3.55% | +0.89% | +4.92% | +2.66% |
| 3M | +22.13% | +3.36% | +6.24% | +18.78% |
| 6M | +5.69% | +14.32% | +24.35% | -8.62% |
| YTD | +41.80% | +13.12% | +22.93% | +28.68% |
| 1Y | +27.03% | +15.07% | +24.02% | +11.96% |
| 3Y | +107.73% | +79.91% | +106.66% | +27.81% |
| 5Y | +85.01% | +77.70% | +109.55% | +7.31% |