PDFS

PDF Solutions, Inc.

Information Technology›Semiconductors & Semiconductor Equipment›Semiconductor Materials & Equipment

19 stocks · 12 ETFs

data as of Oct 12, 2026

REPLACEMENT RESEARCH

Tax-loss harvesting alternatives for PDFS

Among the 19 Semiconductor Materials & Equipment peers screened, ONTO (Onto Innovation) has tracked PDFS most closely over the past year, with a return correlation of 0.79. The strongest fund stand-in is PSI (Invesco Semiconductors ETF) at 0.83 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
ONTO	Onto Innovation	Semiconductor Materials & Equipment	0.79	0.69	0.65	0.63
AMAT	Applied Materials	Semiconductor Materials & Equipment	0.78	0.72	0.67	0.59
MKSI	MKS Instruments	Semiconductor Materials & Equipment	0.76	0.70	0.64	0.58
LRCX	Lam Research	Semiconductor Materials & Equipment	0.76	0.70	0.64	0.58
COHU	Cohu, Inc.	Semiconductor Materials & Equipment	0.74	0.69	0.64	0.54
KLAC	KLA Corp.	Semiconductor Materials & Equipment	0.74	0.69	0.65	0.59
ENTG	Entegris	Semiconductor Materials & Equipment	0.73	0.69	0.64	0.57
ASML	ASML Holding	Semiconductor Materials & Equipment	0.70	0.65	0.60	0.55
FORM	FormFactor, Inc.	Semiconductor Materials & Equipment	0.70	0.66	0.61	0.54
UCTT	Ultra Clean Holdings, Inc.	Semiconductor Materials & Equipment	0.70	0.66	0.61	0.53
ACLS	Axcelis Technologies, Inc.	Semiconductor Materials & Equipment	0.69	0.64	0.61	0.53
AEIS	Advanced Energy	Semiconductor Materials & Equipment	0.69	0.65	0.62	0.57
TER	Teradyne Inc.	Semiconductor Materials & Equipment	0.69	0.63	0.59	0.54
ACMR	ACM Research, Inc.	Semiconductor Materials & Equipment	0.68	0.54	0.49	0.40
KLIC	Kulicke and Soffa Industries, Inc.	Semiconductor Materials & Equipment	0.67	0.65	0.58	0.50
VECO	Veeco Instruments Inc.	Semiconductor Materials & Equipment	0.66	0.64	0.59	0.50
ICHR	Ichor Holdings, Ltd.	Semiconductor Materials & Equipment	0.65	0.60	0.58	0.52
Q	Qnity Electronics	Semiconductor Materials & Equipment	0.63	—	—	—
PLAB	Photronics, Inc.	Semiconductor Materials & Equipment	0.50	0.54	0.52	0.49

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
PSI	Invesco Semiconductors ETF	Semiconductors	INDUSTRY	0.83	0.77	0.71	0.65
SOXX	iShares Semiconductor ETF	Semiconductors	INDUSTRY	0.80	0.74	0.68	0.63
SMH	VanEck Semiconductor ETF	Semiconductors	INDUSTRY	0.79	0.71	0.66	0.61
XSD	SPDR S&P Semiconductor ETF	Semiconductors (Equal Wt)	INDUSTRY	0.78	0.73	0.68	0.63
XLK	Technology Select Sector SPDR	Tech Sector	SECTOR	0.73	0.66	0.62	0.55
FTEC	Fidelity MSCI Info Tech ETF	Tech Sector	SECTOR	0.71	0.66	0.61	0.55
VGT	Vanguard Info Tech ETF	Tech Sector	SECTOR	0.71	0.66	0.61	0.55
QQQ	Invesco QQQ Trust	Nasdaq 100	BROAD	0.69	0.64	0.59	0.53
QQQM	Invesco Nasdaq 100 ETF	Nasdaq 100	BROAD	0.69	0.64	0.59	—
HACK	ETFMG Prime Cyber Security	Cybersecurity	SUB-IND	0.22	0.40	0.43	0.44
IGV	iShares Expanded Tech-Software	Software	INDUSTRY	0.16	0.37	0.42	0.43
BUG	Global X Cybersecurity ETF	Cybersecurity	SUB-IND	0.15	0.34	0.38	0.40

NEXT STEPS

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Replacement research for PDFS's peers

ONTO AMAT MKSI LRCX COHU KLAC ENTG ASML FORM UCTT ACLS AEIS TER ACMR KLIC VECO ICHR Q PLAB

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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.