Tax-loss harvesting alternatives for NPK

Among the 25 Aerospace & Defense peers screened, AIR (AAR Corp.) has tracked NPK most closely over the past year, with a return correlation of 0.30. The strongest fund stand-in is IYJ (iShares US Industrials ETF) at 0.33 over the past year. Correlations are computed from daily closing-price returns aligned by trading day.

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STOCKS

Single-name peers

Ticker	Name	Sub-industry	1Y	3Y	5Y	10Y
AIR	AAR Corp.	Aerospace & Defense	0.30	0.33	0.35	0.34
CW	Curtiss-Wright	Aerospace & Defense	0.29	0.30	0.34	0.40
BA	Boeing Co.	Aerospace & Defense	0.28	0.27	0.29	0.31
VSEC	VSE Corporation	Aerospace & Defense	0.28	0.29	0.29	0.28
SARO	StandardAero	Aerospace & Defense	0.27	0.29	—	—
KRMN	Karman Holdings	Aerospace & Defense	0.26	—	—	—
MOG-A	Moog Inc.	Aerospace & Defense	0.26	0.34	0.38	0.38
TXT	Textron	Aerospace & Defense	0.25	0.35	0.37	0.40
HXL	Hexcel	Aerospace & Defense	0.25	0.31	0.33	0.31
ATI	ATI Inc.	Aerospace & Defense	0.23	0.25	0.29	0.30
KTOS	Kratos Defense & Security Solutions	Aerospace & Defense	0.21	0.23	0.26	0.26
RTX	RTX Corp.	Aerospace & Defense	0.20	0.21	0.29	0.33
BWXT	BWX Technologies	Aerospace & Defense	0.20	0.23	0.26	0.27
TDG	TransDigm Group	Aerospace & Defense	0.19	0.22	0.28	0.28
LHX	L3Harris Technologies	Aerospace & Defense	0.16	0.20	0.27	0.29
HWM	Howmet Aerospace	Aerospace & Defense	0.15	0.22	0.28	0.31
AXON	Axon Enterprise	Aerospace & Defense	0.14	0.17	0.17	0.16
NOC	Northrop Grumman	Aerospace & Defense	0.14	0.10	0.19	0.26
GD	General Dynamics	Aerospace & Defense	0.14	0.22	0.32	0.35
VVX	V2X, Inc.	Aerospace & Defense	0.13	0.24	0.23	0.26
AVAV	AeroVironment	Aerospace & Defense	0.13	0.15	0.19	0.23
PSN	Parsons Corporation	Aerospace & Defense	0.12	0.15	0.19	0.24
LMT	Lockheed Martin	Aerospace & Defense	0.09	0.12	0.20	0.26
HII	Huntington Ingalls Industries	Aerospace & Defense	0.05	0.15	0.23	0.30
HONA	Honeywell Aerospace	Aerospace & Defense	—	—	—	—

ETFS

Fund stand-ins

An ETF is generally not 'substantially identical' to a single stock, which is why funds are the standard wash-sale-aware replacement.

Ticker	Name	Focus	Match	1Y	3Y	5Y	10Y
IYJ	iShares US Industrials ETF	Industrials Sector	SECTOR	0.33	0.41	0.43	0.43
VIS	Vanguard Industrials ETF	Industrials Sector	SECTOR	0.32	0.40	0.44	0.44
XAR	SPDR S&P Aerospace & Defense	Aerospace & Defense (Equal Wt)	INDUSTRY	0.32	0.37	0.42	0.44
FIDU	Fidelity MSCI Industrials ETF	Industrials Sector	SECTOR	0.32	0.40	0.44	0.44
PPA	Invesco Aerospace & Defense ETF	Aerospace & Defense	INDUSTRY	0.31	0.36	0.43	0.43
XLI	Industrial Select Sector SPDR	Industrials Sector	SECTOR	0.31	0.38	0.43	0.43
JETS	US Global Jets ETF	Airlines	SUB-IND	0.31	0.35	0.33	0.33
ITA	iShares Aerospace & Defense ETF	Aerospace & Defense	INDUSTRY	0.31	0.35	0.41	0.42
PAVE	Global X US Infrastructure	Infrastructure	SECTOR	0.30	0.40	0.43	0.45
IYT	iShares Transportation Average	Transportation	INDUSTRY	0.29	0.37	0.38	0.40
XTN	SPDR S&P Transportation ETF	Transportation	INDUSTRY	0.29	0.39	0.39	0.41
BOTZ	Global X Robotics & AI	Robotics & AI	SECTOR	0.27	0.29	0.32	0.32

NEXT STEPS

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Replacement research for NPK's peers

AIR CW BA VSEC SARO KRMN MOG-A TXT HXL ATI KTOS RTX BWXT TDG LHX HWM AXON NOC GD VVX AVAV PSN LMT HII HONA

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Method: Pearson correlation of daily closing-price returns, Yahoo Finance data, series aligned by trading day, refreshed weekly. A cell is blank when overlapping history covers less than 60% of its window. Correlation is descriptive, not predictive. Wash-sale treatment depends on facts and circumstances — confirm with a tax professional. Not investment advice.