NPK International Inc.
US ˙ NYSE ˙ US6517185046
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecurityNR / NPK International Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership362,167 shares
Latest Disclosed Value $ 5,247,800
Renaissance Technologies Llc reports 30.26% decrease in ownership of NR / NPK International Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 362,167 shares of NPK International Inc. (US:NR) valued at $5,247,800 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 519,308 shares of NPK International Inc.. This represents a change in shares of -30.26% during the quarter. The current value of the position is $2,625,711 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F NPK INTERNATIONAL COM SHS 651718504 362,167 -157,141 -30.26 5,248 -15.23 0.0082
2026-02-12 2025-12-31 13F NPK INTERNATIONAL COM SHS 651718504 519,308 -49,033 -8.63 6,190 -3.69 0.0096
2025-11-13 2025-09-30 13F NPK INTERNATIONAL COM SHS 651718504 568,341 -144,900 -20.32 6,428 5.90 0.0085
2025-08-13 2025-06-30 13F NPK INTERNATIONAL COM SHS 651718504 713,241 -95,759 -11.84 6,070 29.13 0.0081
2025-05-14 2025-03-31 13F NPK INTERNATIONAL COM SHS 651718504 809,000 6,184 0.77 4,700 -23.66 0.0071
2025-02-13 2024-12-31 13F NPK INTERNATIONAL COM SHS 651718504 802,816 -56,525 -6.58 6,158 3.39 0.0091
2024-11-13 2024-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 859,341 206,341 31.60 5,955 9.75 0.0090
2024-08-09 2024-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 653,000 15,859 2.49 5,426 135,550.00 0.0092
2024-05-13 2024-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 637,141 -188,122 -22.80 5 -20.00 0.0072
2024-02-13 2023-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 825,263 504,000 156.88 5 150.00 0.0085
2023-11-14 2023-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 321,263 -154,113 -32.42 2 0.00 0.0038
2023-08-11 2023-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 475,376 72,083 17.87 2 100.00 0.0036
2023-05-12 2023-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 403,293 -341,348 -45.84 2 -66.67 0.0021
2023-02-13 2022-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 744,641 33,500 4.71 3 -99.83 0.0042
2022-11-14 2022-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 711,141 22,639 3.29 1,792 -15.75 0.0025
2022-08-12 2022-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 688,502 482,061 233.51 2,127 181.35 0.0025
2022-05-13 2022-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 206,441 129,341 167.76 756 233.04 0.0009
2022-02-11 2021-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 77,100 57,400 291.37 227 249.23 0.0003
2021-11-12 2021-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 19,700 -307,141 -93.97 65 -94.25 0.0001
2021-08-13 2021-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 326,841 -388,500 -54.31 1,131 -49.64 0.0014
2021-05-13 2021-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 715,341 -655,500 -47.82 2,246 -14.67 0.0028
2021-02-10 2020-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 1,370,841 395,380 40.53 2,632 157.03 0.0029
2020-11-13 2020-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 975,461 405,441 71.13 1,024 -19.43 0.0010
2020-08-13 2020-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 570,020 -236,141 -29.29 1,271 75.80 0.0011
2020-05-14 2020-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 806,161 650,161 416.77 723 -26.07 0.0007
2020-02-13 2019-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 156,000 -110,900 -41.55 978 -51.92 0.0008
2019-11-13 2019-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 266,900 -225,600 -45.81 2,034 -44.33 0.0017
2019-08-12 2019-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 492,500 5,500 1.13 3,654 -18.09 0.0032
2019-05-14 2019-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 487,000 -222,441 -31.35 4,461 -8.47 0.0041
2019-02-12 2018-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 709,441 147,091 26.16 4,874 -16.25 0.0053
2018-11-13 2018-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 562,350 105,350 23.05 5,820 17.39 0.0060
2018-08-13 2018-06-30 13F/A-1 NEWPARK RES COM PAR $.01NEW 651718504 457,000 187,500 69.57 4,958 127.12 0.0054
2018-08-13 2018-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 269,500 2,183
2018-05-14 2018-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 269,500 73,608 37.58 2,183 29.55 0.0024
2018-02-13 2017-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 195,892 132,292 208.01 1,685 164.94 0.0019
2017-11-13 2017-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 63,600 63,600 -67.53 636 -62.26 0.0007
2017-05-12 2017-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 0 -277,300 -100.00 0 -100.00
2017-02-13 2016-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 277,300 28,100 11.28 2,080 13.41 0.0033
2016-11-14 2016-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 249,200 -64,100 -20.46 1,834 1.10 0.0032
2016-08-12 2016-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 313,300 -24,100 -7.14 1,814 24.42 0.0035
2016-05-13 2016-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 337,400 212,100 169.27 1,458 120.24 0.0028
2016-02-11 2015-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 125,300 -844,697 -87.08 662 -86.67 0.0014
2015-11-12 2015-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 969,997 614,597 172.93 4,966 71.89 0.0119
2015-08-14 2015-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 355,400 288,800 433.63 2,889 375.95 0.0066
2015-05-13 2015-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 66,600 66,600 -81.26 607 -78.99 0.0013
2014-11-12 2014-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 0 -579,400 -100.00 0 -100.00
2014-08-13 2014-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 579,400 217,252 59.99 7,219 74.08 0.0168
2014-05-14 2014-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 362,148 143,948 65.97 4,147 54.62 0.0099
2014-02-14 2013-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 218,200 74,300 51.63 2,682 47.20 0.0064
2013-11-13 2013-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 143,900 -4,500 -3.03 1,822 11.71 0.0044
2013-08-12 2013-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 148,400 148,400 1,631 0.0043
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.