ASML vs KLAC: Correlation
Measured on weekly returns over the past three years, ASML Holding N.V. - New York Registry Shares (ASML) and KLA Corporation (KLAC) carry a correlation of 0.77, a strong link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ASML and KLAC?
Across a 3-year window, the weekly returns of ASML and KLAC correlate at 0.77, strong. The relationship has been stable: the 1-year correlation (0.77) sits close to the 3-year figure. Stretching to 5 years gives 0.79, with an annualized covariance of 1360.9 %².
KLAC is one of the assets that tracks ASML most closely: it ranks #2 out of the 10 assets we track against ASML. The last year tells two different stories: ASML led by 18.9 percentage points, +126.8% for ASML against +107.9% for KLAC.
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.
ASML vs KLAC: side by side
| ASML (ASML Holding N.V. - New York Registry Shares) | KLAC (KLA Corporation) | |
|---|---|---|
| 1-year return | +126.8% | +107.9% |
| 5-year return | +116.6% | +463.9% |
| Volatility (ann.) | 38.6% | 45.6% |
| Beta vs S&P 500 | 1.52 | 1.84 |
| Max drawdown (3Y) | -45.5% | -43.6% |
| Market cap | $666.4B | $240.1B |
| P/E (trailing) | 58.5 | 50.2 |
| Dividend yield | 0.25% | 0.44% |
| Sector / category | US Listed | Information Technology |
Year-by-year returns
| Year | ASML | KLAC |
|---|---|---|
| 2022 | -30.5% | -11.2% |
| 2023 | +39.9% | +56.0% |
| 2024 | -7.7% | +9.4% |
| 2025 | +55.8% | +94.5% |
| 2026 | +63.0% | +51.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ASML and KLAC good diversifiers for each other?
Somewhat, no more. With 0.77 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between ASML and KLAC?
As of 2026-08-27, the correlation of weekly returns between ASML and KLAC is 0.77 over 3 years, 0.77 over 1 year and 0.79 over 5 years.
Is KLAC a good diversifier for ASML?
Somewhat, no more. With 0.77 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.77 mean?
On the −1 to +1 scale, 0.77 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/asml-vs-klac.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/asml-vs-klac/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ASML correlations · KLAC correlations
