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

SecurityNR / NPK International Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership77,283 shares
Latest Disclosed Value $ 1,119,831
Citigroup Inc reports 3,205.52% increase in ownership of NR / NPK International Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 77,283 shares of NPK International Inc. (US:NR) valued at $1,119,831 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,338 shares of NPK International Inc.. This represents a change in shares of 3,205.52% during the quarter. The current value of the position is $560,302 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)
2026-05-11 2026-03-31 13F NPK INTERNATIONAL COM SHS 651718504 77,283 74,945 3,205.52 1,120 4,044.44 0.0002
2026-02-13 2025-12-31 13F NPK INTERNATIONAL COM SHS 651718504 2,338 -55,556 -95.96 28 -95.87 0.0000
2025-11-10 2025-09-30 13F NPK INTERNATIONAL COM SHS 651718504 57,894 15,051 35.13 655 79.67 0.0003
2025-08-11 2025-06-30 13F NPK INTERNATIONAL COM SHS 651718504 42,843 -28,707 -40.12 365 -12.29 0.0002
2025-05-12 2025-03-31 13F NPK INTERNATIONAL COM SHS 651718504 71,550 -7,383 -9.35 416 -31.40 0.0002
2025-02-12 2024-12-31 13F NPK INTERNATIONAL COM SHS 651718504 78,933 11,585 17.20 605 29.83 0.0004
2024-11-12 2024-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 67,348 44,905 200.08 467 150.54 0.0003
2024-08-12 2024-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 22,443 7,037 45.68 187 67.57 0.0001
2024-05-10 2024-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 15,406 2,854 22.74 111 33.73 0.0001
2024-02-09 2023-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 12,552 11,310 910.63 83 937.50 0.0001
2023-12-06 2023-09-30 13F/A-1 NEWPARK RES COM PAR $.01NEW 651718504 1,242 -36,629 -96.72 9 -95.96 0.0000
2023-11-09 2023-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 1,242 -36,629 9 0.0000
2023-08-10 2023-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 37,871 37,871 198 0.0001
2023-05-11 2023-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 0 -581 -100.00 0 -100.00
2023-02-09 2022-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 581 -725 -55.51 2 -33.33 0.0000
2022-11-10 2022-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 1,306 -4,960 -79.16 3 -84.21 0.0000
2022-08-10 2022-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 6,266 2,377 61.12 19 35.71 0.0000
2022-05-12 2022-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 3,889 -18,632 -82.73 14 -78.79 0.0000
2022-02-10 2021-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 22,521 11,499 104.33 66 83.33 0.0000
2021-11-10 2021-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 11,022 6,775 159.52 36 140.00 0.0000
2021-08-10 2021-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 4,247 -2,281 -34.94 15 -25.00 0.0000
2021-05-13 2021-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 6,528 -11,834 -64.45 20 -42.86 0.0000
2021-02-11 2020-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 18,362 12,776 228.71 35 483.33 0.0000
2020-11-12 2020-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 5,586 -23,955 -81.09 6 -90.91 0.0000
2020-08-12 2020-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 29,541 -827 -2.72 66 144.44 0.0001
2020-05-12 2020-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 30,368 -12,979 -29.94 27 -90.07 0.0000
2020-02-12 2019-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 43,347 -30,041 -40.93 272 -51.34 0.0002
2019-11-08 2019-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 73,388 7,027 10.59 559 13.62 0.0004
2019-08-12 2019-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 66,361 13,347 25.18 492 1.44 0.0004
2019-05-13 2019-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 53,014 -23,078 -30.33 485 -7.27 0.0005
2019-02-12 2018-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 76,092 20,011 35.68 523 -9.83 0.0005
2018-11-13 2018-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 56,081 39,103 230.32 580 213.51 0.0005
2018-08-10 2018-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 16,978 -8,349 -32.96 185 -9.76 0.0002
2018-05-11 2018-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 25,327 20,493 423.93 205 388.10 0.0002
2018-02-12 2017-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 4,834 4,500 1,347.31 42 1,300.00 0.0000
2017-11-13 2017-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 334 -684 -67.19 3 -57.14 0.0000
2017-08-11 2017-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 1,018 -50,628 -98.03 7 -98.33 0.0000
2017-05-12 2017-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 51,646 -104,877 -67.00 418 -64.40 0.0004
2017-02-10 2016-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 156,523 71,383 83.84 1,174 87.54 0.0011
2016-11-10 2016-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 85,140 37,688 79.42 626 127.64 0.0006
2016-08-12 2016-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 47,452 -40,009 -45.74 275 -27.25 0.0003
2016-05-13 2016-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 87,461 50,865 138.99 378 95.85 0.0004
2016-02-12 2015-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 36,596 6,942 23.41 193 26.97 0.0002
2015-11-13 2015-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 29,654 20,038 208.38 152 94.87 0.0001
2015-08-13 2015-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 9,616 -23,244 -70.74 78 -73.91 0.0001
2015-05-14 2015-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 32,860 -38,244 -53.79 299 -55.90 0.0003
2015-02-17 2014-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 71,104 52,006 272.31 678 186.08 0.0006
2014-11-14 2014-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 19,098 3,147 19.73 237 19.10 0.0002
2014-08-14 2014-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 15,951 -31,947 -66.70 199 -63.69 0.0002
2014-05-15 2014-03-31 13F NEWPARK RES COM PAR $.01NEW 651718504 47,898 -4,619 -8.80 548 -15.04 0.0006
2014-02-14 2013-12-31 13F NEWPARK RES COM PAR $.01NEW 651718504 52,517 39,414 300.80 645 288.55 0.0006
2013-11-14 2013-09-30 13F NEWPARK RES COM PAR $.01NEW 651718504 13,103 -6,941 -34.63 166 -24.55 0.0002
2013-08-14 2013-06-30 13F NEWPARK RES COM PAR $.01NEW 651718504 20,044 20,044 220 0.0002
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.