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Insider Trading Intelligence
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Michael A. Lewis

NPKI
DIRECTOR · NPK INTERNATIONAL INC. · CIK 0001423238
FILING MIX · LIFETIME53%/47%
BUYS
8
SELLS
7
TOTAL VALUE
$502.7K
COMPANIES
3
ACTIVE SINCE
Aug 2020
HOLDINGS NOW
153,627
AVG SELL PX
$16.43
TRADE KIND
SHOWING 15 / 15
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
5 backtested trades · 8 horizons · 10 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Michael A. Lewis, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d5+40.00%+0.38%+0.57%-0.19%-0.71%—
14d5+40.00%+1.08%+1.10%-0.02%+0.56%—
30d5+20.00%+2.89%+1.49%+1.40%+2.91%—
60d5+0.00%+12.63%+5.08%+7.55%+6.05%—
90d5+0.00%+15.51%+5.64%+11.79%+12.46%—
180d5(1 pending)+0.00%+34.71%+10.14%+26.87%+33.97%—
1y5(4 pending)+0.00%+71.40%+25.25%+46.15%+46.15%—
2y5(5 pending)——————
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
NPKI · 137,878 shares · as of May 20, 2026
034,84669,693104,539139,3852026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 8 buys / 7 sellsCOVERAGE · 24 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
NPKI
NPK INTERNATIONAL INC.
PURCHASEGRANT
Stock grant
8,558——137,878May 20, 2026May 21, 2026 ↗View →
NPKI
NPK INTERNATIONAL INC.
SALE10b5-1
10b5-1 plan
2,013$15.30$30.8K129,320May 15, 2026May 19, 2026 ↗View →
NPKI
NPK INTERNATIONAL INC.
SALE10b5-1
10b5-1 plan
2,013$14.31$28.8K131,333Feb 23, 2026Feb 25, 2026 ↗View →
NPKI
NPK INTERNATIONAL INC.
SALE10b5-1
10b5-1 plan
2,013$12.00$24.2K133,346Nov 24, 2025Nov 25, 2025 ↗View →
NPKI
NPK INTERNATIONAL INC.
SALE10b5-1
10b5-1 plan
2,013$10.33$20.8K135,359Aug 25, 2025Aug 26, 2025 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
SALE10b5-1
10b5-1 plan
1,937$40.10$77.7K13,509Jul 21, 2025Jul 22, 2025 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
3,873$40.02$155.0K15,446Jul 18, 2025Jul 21, 2025 ↗View →
NPKI
NPK INTERNATIONAL INC.
SALE10b5-1
10b5-1 plan
2,013$8.60$17.3K137,372Jun 16, 2025Jun 17, 2025 ↗View →
NPKI
NPK INTERNATIONAL INC.
PURCHASEGRANT
Stock grant
15,097——139,385May 15, 2025May 19, 2025 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
3,128$46.35$145.0K11,573Jul 19, 2024Jul 22, 2024 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
2,949——8,445Jul 21, 2023Jul 21, 2023 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
2,596——5,496Jul 21, 2022Jul 22, 2022 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
2,229——2,900Apr 27, 2021Apr 29, 2021 ↗View →
POR
PORTLAND GENERAL ELECTRIC CO /OR/
PURCHASEGRANT
Stock grant
666——666Jan 4, 2021Jan 5, 2021 ↗View →
PCG
PG&E CORP
SALE
Interim Pres, PacificGas&Elec
336$9.35$3.1K2,240Aug 1, 2020Aug 5, 2020 ↗View →
Other insiders · NPKI
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About this filer
CIK 0001423238
ROLE
Director
PRIMARY
NPKI
COMPANIES
3
ACTIVE SINCE
Aug 2020
MARKETPEEL · /INSIDER/0001423238DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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