Ticker · CUSIP 637215104
Holders (tracked)
7
Combined shares
358,708
Combined value
$37.71M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
SEC event timeline
15 events
- Izzy Englander (Millennium Mgmt) added2026-02-17+3,405 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−17,418 shares · 2025Q413F
- Ken Griffin (Citadel Advisors) added2026-02-17+7,974 shares · 2025Q413F
- T. Rowe Price added2026-02-17+355 shares · 2025Q413F
- AQR Capital Management added2026-02-17+367 shares · 2025Q413F
- Renaissance Technologies trimmed2026-02-12−20,200 shares · 2025Q413F
- Mario Gabelli (GAMCO) added2026-02-05+520 shares · 2025Q413F
- AQR Capital Management trimmed2025-11-14−3,840 shares · 2025Q313F
- +51,336 shares · 2025Q313F
- Two Sigma Investments added2025-11-14+14,831 shares · 2025Q313F
- D.E. Shaw & Co. exited2025-11-14−6,052 shares · 2025Q313F
- T. Rowe Price added2025-11-14+123 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−16,200 shares · 2025Q313F
- Norges Bank (Norway SWF) exited2025-11-13−9,600 shares · 2025Q313F
- Mario Gabelli (GAMCO) trimmed2025-11-12−5,053 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions0
—
Added to5
- Ken Griffin (Citadel Advisors)+7,974$851K
- Izzy Englander (Millennium Mgmt)+3,405$364K
- Mario Gabelli (GAMCO)+520$56K
- AQR Capital Management+367$39K
- T. Rowe Price+355$38
Trimmed2
- Renaissance Technologies−20,200$2.2M
- Two Sigma Investments−17,418$1.9M
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 8 | $1.69B |
| 2022Q2 | 7 | $1.21B |
| 2022Q3 | 7 | $1.2M |
| 2022Q4 | 8 | $70.4M |
| 2023Q1 | 6 | $73.7M |
| 2023Q2 | 8 | $77.0M |
| 2023Q3 | 7 | $74.6M |
| 2023Q4 | 8 | $84.1M |
| 2024Q1 | 8 | $88.4M |
| 2024Q2 | 9 | $102.6M |
| 2024Q3 | 9 | $37.1M |
| 2024Q4 | 9 | $41.1M |
| 2025Q1 | 8 | $33.1M |
| 2025Q2 | 8 | $33.9M |
| 2025Q3 | 7 | $42.5M |
| 2025Q4 | 7 | $37.7M |
Who owns NPK
7 super-investors · 2025Q4
Tracked stake
358.7K
shares
Combined value
$38M
% of shares outstanding
—
shares-out unknown
Quarter action mix
Added5Trim2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Renaissance Technologies | 162.8K | $17M |
| 2 | Mario Gabelli GAMCO | 95.8K | $10M |
| 3 | Izzy Englander Millennium Mgmt | 54.7K | $6M |
| 4 | Ken Griffin Citadel Advisors | 27.0K | $3M |
| 5 | Two Sigma Investments | 7.9K | $843K |
| 6 | AQR Capital Management | 4.9K | $523K |
| 7 | T. Rowe Price | 5.5K | $590 |
Recent moves
20 transactions
- +7,974 · 2025Q4
- −17,418 · 2025Q4
- +3,405 · 2025Q4
- +355 · 2025Q4
- +367 · 2025Q4
- −20,200 · 2025Q4
- +520 · 2025Q4
- −3,840 · 2025Q3
- +123 · 2025Q3
- +14,831 · 2025Q3
- +51,336 · 2025Q3
- SOLDD.E. Shaw & Co.−6,052 · 2025Q3
- −9,600 · 2025Q3
- −16,200 · 2025Q3
- −5,053 · 2025Q3
- +429 · 2025Q2
- −5,072 · 2025Q2
- −14,254 · 2025Q2
- TRIMD.E. Shaw & Co.−4,905 · 2025Q2
- −10,982 · 2025Q2
Embed this chart
Paste this iframe anywhere to embed the live NPK chart.
<iframe src="https://openstocks.me/embed/stock/NPK" width="100%" height="480" frameborder="0" loading="lazy" title="NPK chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>