| Period | NPK | S&P 500 | NASDAQ | vs S&P |
|---|---|---|---|---|
| 1D | +0.88% | +0.37% | +0.87% | +0.51% |
| 5D | +3.84% | +0.49% | +0.22% | +3.36% |
| 1M | +25.20% | +3.68% | +4.45% | +21.52% |
| 3M | +19.79% | +2.11% | -2.33% | +17.67% |
| 6M | +17.20% | +11.17% | +16.94% | +6.03% |
| YTD | +46.26% | +12.17% | +16.20% | +34.09% |
| 1Y | +45.80% | +19.28% | +24.92% | +26.52% |
| 3Y | +113.94% | +73.08% | +94.26% | +40.87% |
| 5Y | +86.09% | +71.72% | +91.31% | +14.37% |