KLAC vs PDFS: Correlation
How closely do KLA Corporation (KLAC) and PDF Solutions, Inc. (PDFS) trade together? Their weekly returns over three years give a correlation of 0.69, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are KLAC and PDFS?
Across a 3-year window, the weekly returns of KLAC and PDFS correlate at 0.69, strong. Recent behaviour matches the longer record: 0.74 over 1 year against 0.69 over 3. Stretching to 5 years gives 0.64, with an annualized covariance of 1484.7 %².
Among the 40 assets we track against KLAC, PDFS ranks #15 by 3-year correlation. Correlation aside, the last 12 months split them widely, with PDFS ahead by 25.7 points (+107.9% versus +133.6%).
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
KLAC vs PDFS: side by side
| KLAC (KLA Corporation) | PDFS (PDF Solutions, Inc.) | |
|---|---|---|
| 1-year return | +107.9% | +133.6% |
| 5-year return | +463.9% | +105.9% |
| Volatility (ann.) | 45.6% | 47.4% |
| Beta vs S&P 500 | 1.84 | 1.55 |
| Max drawdown (3Y) | -43.6% | -58.5% |
| Market cap | $240.1B | $1.9B |
| P/E (trailing) | 50.2 | 177.5 |
| Dividend yield | 0.44% | 0.00% |
| Sector / category | Information Technology | US Listed |
Year-by-year returns
| Year | KLAC | PDFS |
|---|---|---|
| 2022 | -11.2% | -10.3% |
| 2023 | +56.0% | +12.7% |
| 2024 | +9.4% | -15.7% |
| 2025 | +94.5% | +5.4% |
| 2026 | +51.8% | +61.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are KLAC and PDFS good diversifiers for each other?
To a limited degree. At 0.69 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between KLAC and PDFS?
Using weekly returns as of 2026-08-27: 0.69 over 3 years, with 0.74 over the last year and 0.64 over 5 years.
Is PDFS a good diversifier for KLAC?
To a limited degree. At 0.69 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.69 mean?
On the −1 to +1 scale, 0.69 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/klac-vs-pdfs.json
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Related comparisons
Hubs: KLAC correlations · PDFS correlations
