NPK International Inc.
US ˙ NYSE ˙ US6517185046
DIESES SYMBOL IST NICHT MEHR AKTIV

SecurityNR / NPK International Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership968,501 shares
Latest Disclosed Value $ 14,033,579
Northern Trust Corp reports 2.62% increase in ownership of NR / NPK International Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 968,501 shares of NPK International Inc. (US:NR) valued at $14,033,579 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 943,746 shares of NPK International Inc.. This represents a change in shares of 2.62% during the quarter. The current value of the position is $7,021,632 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 968,501 24,755 2.62 14,034 24.75 0.0004
2026-02-17 2025-12-31 13F NPK INTERNATIONAL COM SHS 651718504 943,746 -44,239 -4.48 11,249 0.67 0.0003
2025-11-14 2025-09-30 13F NPK INTERNATIONAL COM SHS 651718504 987,985 -2,007 -0.20 11,174 32.64 0.0014
2025-08-13 2025-06-30 13F NPK INTERNATIONAL COM SHS 651718504 989,992 -89,085 -8.26 8,425 34.38 0.0012
2025-05-13 2025-03-31 13F NPK INTERNATIONAL COM SHS 651718504 1,079,077 -76,700 -6.64 6,269 -29.28 0.0009
2025-02-14 2024-12-31 13F NPK INTERNATIONAL COM SHS 651718504 1,155,777 57,886 5.27 8,865 16.51 0.0013
2024-11-13 2024-09-30 13F NEWPARK RES COM 651718504 1,097,891 59,904 5.77 7,608 -11.79 0.0012
2024-08-14 2024-06-30 13F NEWPARK RES COM 651718504 1,037,987 -15,464 -1.47 8,626 13.41 0.0015
2024-05-14 2024-03-31 13F NEWPARK RES COM 651718504 1,053,451 -120,144 -10.24 7,606 -2.40 0.0013
2024-02-13 2023-12-31 13F NEWPARK RES COM 651718504 1,173,595 53,855 4.81 7,793 0.71 0.0014
2023-11-13 2023-09-30 13F NEWPARK RES COM 651718504 1,119,740 -10,617 -0.94 7,737 30.89 0.0015
2023-08-11 2023-06-30 13F NEWPARK RES COM 651718504 1,130,357 750 0.07 5,912 35.95 0.0011
2023-05-15 2023-03-31 13F NEWPARK RES COM 651718504 1,129,607 -27,489 -2.38 4,349 -9.44 0.0009
2023-02-13 2022-12-31 13F NEWPARK RES COM 651718504 1,157,096 -14,918 -1.27 4,802 62.58 0.0010
2022-11-14 2022-09-30 13F NEWPARK RES COM 651718504 1,172,014 -9,427 -0.80 2,953 -19.12 0.0007
2022-08-12 2022-06-30 13F NEWPARK RES COM 651718504 1,181,441 -51,680 -4.19 3,651 -19.10 0.0008
2022-05-13 2022-03-31 13F NEWPARK RES COM 651718504 1,233,121 -46,128 -3.61 4,513 19.99 0.0008
2022-02-08 2021-12-31 13F NEWPARK RES COM 651718504 1,279,249 -16,987 -1.31 3,761 -12.06 0.0006
2021-11-15 2021-09-30 13F NEWPARK RES COM 651718504 1,296,236 -40,836 -3.05 4,277 -7.54 0.0008
2021-08-13 2021-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 1,337,072 -36,041 -2.62 4,626 7.28 0.0008
2021-05-12 2021-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 1,373,113 -558,258 -28.90 4,312 16.29 0.0008
2021-02-11 2020-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 1,931,371 -1,049,934 -35.22 3,708 18.47 0.0007
2020-11-16 2020-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 2,981,305 -67,771 -2.22 3,130 -53.97 0.0007
2020-08-14 2020-06-30 13F NEWPARK RES COM 651718504 3,049,076 -54,569 -1.76 6,800 144.25 0.0016
2020-05-14 2020-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,103,645 1,134 0.04 2,784 -85.69 0.0008
2020-02-14 2019-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,102,511 -21,118 -0.68 19,453 -18.27 0.0044
2019-11-13 2019-09-30 13F NEWPARK RES COM 651718504 3,123,629 21,154 0.68 23,802 3.40 0.0057
2019-08-13 2019-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 3,102,475 -108,012 -3.36 23,020 -21.72 0.0055
2019-05-13 2019-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,210,487 172,455 5.68 29,409 40.90 0.0073
2019-02-12 2018-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,038,032 -2,479 -0.08 20,872 -33.67 0.0059
2018-11-14 2018-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 3,040,511 -104,175 -3.31 31,469 -7.77 0.0077
2018-09-18 2018-06-30 13F/A-1 NEWPARK RES COM PAR $.01NEW 651718504 3,144,686 137,876 4.59 34,119 40.08 0.0087
2018-08-14 2018-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 3,150,487 143,677 34,182
2018-05-09 2018-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,006,810 8,471 0.28 24,356 -5.54 0.0063
2018-02-14 2017-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 2,998,339 -45,201 -1.49 25,785 -15.28 0.0065
2017-11-13 2017-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 3,043,540 -18,429 -0.60 30,437 35.25 0.0079
2017-08-11 2017-06-30 13F NEWPARK RES COM 651718504 3,061,969 211,721 7.43 22,505 -2.52 0.0063
2017-05-12 2017-03-31 13F NEWPARK RES COM 651718504 2,850,248 8,994 0.32 23,086 8.34 0.0067
2017-02-13 2016-12-31 13F NEWPARK RES COM 651718504 2,841,254 -143,857 -4.82 21,309 -3.01 0.0065
2016-11-09 2016-09-30 13F NEWPARK RES COM 651718504 2,985,111 -145,112 -4.64 21,971 21.23 0.0068
2016-08-12 2016-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 3,130,223 -58,939 -1.85 18,123 31.03 0.0059
2016-08-19 2016-03-31 13F/A-1 NEWPARK RES COM PAR $.01NEW 651718504 3,189,162 33,378 1.06 13,831 -17.00 0.0046
2016-05-13 2016-03-31 13F Newpark Res COMM 651718504 3,189,162 13,777
2016-02-12 2015-12-31 13F Newpark Res COMM 651718504 3,155,784 -4,287 -0.14 16,663 2.99 0.0055
2015-11-12 2015-09-30 13F Newpark Res COMM 651718504 3,160,071 3,160,071 0.00 16,179 0.0054
2015-08-13 2015-06-30 13F Newpark Res COMM 651718504 0 -3,003,642 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Newpark Res COMM 651718504 3,003,642 183,493 6.51 27,363 1.71 0.0082
2015-02-12 2014-12-31 13F Newpark Res COM 651718504 2,820,149 4,360 0.15 26,904 -23.19 0.0081
2014-11-13 2014-09-30 13F Newpark Res COMM 651718504 2,815,789 -25,338 -0.89 35,028 -1.05 0.0110
2014-08-14 2014-06-30 13F NEWPARK RES com 651718504 2,841,127 7,556 0.27 35,400 9.11 0.0110
2014-05-14 2014-03-31 13F NEWPARK RES COMM 651718504 2,833,571 -95,907 -3.27 32,444 -9.89 0.0102
2014-02-21 2013-12-31 13F/A-1 NEWPARK RES COM 651718504 2,929,478 133,874 4.79 36,003 1.73 0.0115
2014-02-12 2013-12-31 13F NEWPARK RES COM 651718504 2,929,478 36,003
2013-11-13 2013-09-30 13F NEWPARK RES COM 651718504 2,795,604 -36,336 -1.28 35,392 13.72 0.0125
2013-08-09 2013-06-30 13F NEWPARK RES COM 651718504 2,831,940 2,831,940 31,123 0.0113
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.