| Period | NPK | S&P 500 | NASDAQ | vs S&P |
|---|---|---|---|---|
| 1D | -0.62% | -0.45% | -0.80% | -0.17% |
| 5D | +3.62% | +0.40% | +0.07% | +3.22% |
| 1M | +6.35% | -1.53% | -2.83% | +7.88% |
| 3M | +18.43% | +2.69% | -1.84% | +15.74% |
| 6M | +14.68% | +15.32% | +19.59% | -0.64% |
| YTD | +43.30% | +11.37% | +15.67% | +31.92% |
| 1Y | +33.98% | +15.13% | +19.86% | +18.86% |
| 3Y | +104.22% | +71.51% | +91.33% | +32.71% |
| 5Y | +86.99% | +70.15% | +87.46% | +16.83% |