Ticker: NPK CUSIP: 637215104 Class: COM
Note: Option positions (PUT/CALL) are excluded.
| Period | Shares | Value ($000) | Average Close | Price Range |
|---|---|---|---|---|
| Q2 2025 | 9,600 | $940 | $87.38 | $77.63 - $100.17 |
| Q4 2024 | 19,700 | $1,939 | $80.38 | $69.80 - $99.07 |
| Q3 2024 | 19,700 | $1,480 | $74.60 | $69.58 - $79.26 |
| Q2 2024 | 19,700 | $1,480 | $78.76 | $72.07 - $86.08 |
| Q1 2024 | 10,100 | $846 | $79.07 | $73.97 - $84.29 |
| Q4 2023 | 10,100 | $811 | $76.85 | $70.86 - $83.00 |
| Q3 2023 | 13,800 | $1,000 | $75.50 | $70.24 - $81.40 |
| Q2 2023 | 14,000 | $1,025 | $73.54 | $66.83 - $82.59 |
| Q4 2022 | 21,600 | $1,479 | $68.37 | $63.90 - $71.73 |
| Q3 2022 | 17,300 | $1,125 | $69.19 | $63.06 - $78.78 |
| Q2 2022 | 17,300 | $1,136 | $70.97 | $59.99 - $79.31 |
| Q1 2022 | 20,862 | $1,605 | $81.17 | $76.40 - $89.05 |
| Q4 2021 | 20,862 | $1,711 | $83.82 | $78.33 - $89.50 |
| Q3 2021 | 3,562 | $292 | $89.68 | $79.78 - $103.69 |
| Q2 2021 | 3,562 | $362 | $103.08 | $97.03 - $107.89 |
| Q1 2021 | 15,468 | $1,579 | $98.38 | $86.66 - $117.87 |
| Q4 2020 | 58,266 | $5,152 | $85.92 | $79.49 - $94.30 |
| Q3 2020 | 63,123 | $5,167 | $87.32 | $81.09 - $95.66 |
| Q2 2020 | 58,332 | $5,098 | $85.05 | $68.17 - $97.90 |
| Q1 2020 | 22,542 | $1,596 | $84.26 | $66.60 - $93.99 |
| Q4 2019 | 34,669 | $3,064 | $87.02 | $80.39 - $92.37 |
| Q3 2019 | 34,669 | $3,089 | $90.44 | $82.38 - $97.82 |
| Q2 2019 | 55,789 | $5,205 | $101.82 | $89.24 - $112.50 |
| Q1 2019 | 55,789 | $6,056 | $116.40 | $99.24 - $133.12 |
| Q4 2018 | 55,789 | $6,523 | $125.24 | $109.50 - $133.95 |
| Q3 2018 | 55,789 | $7,233 | $126.95 | $115.25 - $140.32 |
| Q2 2018 | 55,789 | $6,918 | $107.98 | $92.00 - $136.65 |
| Q1 2018 | 106,411 | $9,976 | $99.25 | $88.80 - $108.45 |
| Q4 2017 | 106,611 | $10,603 | $109.11 | $95.50 - $121.40 |
| Q3 2017 | 133,985 | $14,263 | $105.66 | $95.65 - $114.70 |
| Q2 2017 | 127,242 | $14,060 | $105.57 | $98.05 - $112.45 |
| Q1 2017 | 120,442 | $12,309 | $103.21 | $91.75 - $112.00 |
| Q4 2016 | 72,103 | $7,672 | $93.06 | $83.53 - $108.75 |
| Q3 2016 | 72,103 | $6,046 | $90.73 | $85.13 - $96.25 |
| Q2 2016 | 62,189 | $5,868 | $87.97 | $81.96 - $94.35 |
| Q1 2016 | 62,189 | $5,208 | $80.09 | $72.30 - $88.00 |
| Q4 2015 | 62,189 | $5,153 | $86.71 | $78.13 - $94.18 |
| Q3 2015 | 56,289 | $4,743 | $81.19 | $74.57 - $88.00 |
| Q2 2015 | 43,389 | $3,485 | $68.50 | $61.65 - $80.34 |
| Q1 2015 | 41,893 | $2,656 | $61.65 | $56.04 - $67.90 |
| Q4 2014 | 41,893 | $2,431 | $59.42 | $54.07 - $63.69 |
| Q3 2014 | 41,893 | $2,543 | $66.40 | $60.68 - $75.50 |
| Q2 2014 | 41,893 | $3,051 | $71.81 | $67.09 - $77.75 |
| Q1 2014 | 41,893 | $3,269 | $78.13 | $73.04 - $84.00 |
| Q4 2013 | 41,893 | $3,372 | $73.58 | $67.32 - $81.00 |
| Q3 2013 | 41,893 | $2,949 | $72.80 | $68.50 - $77.50 |
| Q2 2013 | 41,893 | $3,018 | $76.01 | $70.25 - $80.50 |
| Q1 2013 | 41,893 | $3,372 | $74.65 | $68.64 - $80.68 |
| Q3 2012 | 32,267 | $2,352 | — | — |
| Q2 2012 | 32,267 | $2,147 | — | — |