ACLS vs KLAC: Correlation
How closely do Axcelis Technologies, Inc. (ACLS) and KLA Corporation (KLAC) trade together? Their weekly returns over three years give a correlation of 0.67, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACLS and KLAC?
Over the past 3 years, ACLS and KLAC moved with a correlation of 0.67, which is strong. Little has changed lately, as the 1-year reading of 0.62 lands near the 3-year figure. Over 5 years the correlation is 0.72, and the annualized covariance of weekly returns is 1575.6 %².
Within ACLS's tracked universe of 11 assets, KLAC comes in at #5 by 3-year correlation. The last year tells two different stories: KLAC led by 58.5 percentage points, +49.4% for ACLS 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.
ACLS vs KLAC: side by side
| ACLS (Axcelis Technologies, Inc.) | KLAC (KLA Corporation) | |
|---|---|---|
| 1-year return | +49.4% | +107.9% |
| 5-year return | +140.5% | +463.9% |
| Volatility (ann.) | 51.6% | 45.6% |
| Beta vs S&P 500 | 1.57 | 1.84 |
| Max drawdown (3Y) | -78.0% | -43.6% |
| Market cap | $3.8B | $240.1B |
| P/E (trailing) | 40.4 | 50.2 |
| Dividend yield | 0.00% | 0.44% |
| Sector / category | US Listed | Information Technology |
Year-by-year returns
| Year | ACLS | KLAC |
|---|---|---|
| 2022 | +6.4% | -11.2% |
| 2023 | +63.4% | +56.0% |
| 2024 | -46.1% | +9.4% |
| 2025 | +15.0% | +94.5% |
| 2026 | +52.4% | +51.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACLS and KLAC good diversifiers for each other?
Somewhat, no more. With 0.67 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between ACLS and KLAC?
Using weekly returns as of 2026-08-27: 0.67 over 3 years, with 0.62 over the last year and 0.72 over 5 years.
Is KLAC a good diversifier for ACLS?
Somewhat, no more. With 0.67 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.67 mean?
On the −1 to +1 scale, 0.67 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/acls-vs-klac.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/acls-vs-klac/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACLS correlations · KLAC correlations
