ACLS vs SOXX: Correlation
How closely do Axcelis Technologies, Inc. (ACLS) and iShares Semiconductor ETF (SOXX) trade together? Their weekly returns over three years give a correlation of 0.70, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACLS and SOXX?
Across a 3-year window, the weekly returns of ACLS and SOXX correlate at 0.70, strong. The relationship has been stable: the 1-year correlation (0.63) sits close to the 3-year figure. Stretching to 5 years gives 0.75, with an annualized covariance of 1279.8 %².
SOXX is one of the assets that tracks ACLS most closely: it ranks #2 out of the 11 assets we track against ACLS. Their recent paths diverged sharply: over the last 12 months SOXX outperformed by 60.6 percentage points (+49.4% for ACLS against +110.0% for SOXX).
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 SOXX: side by side
| ACLS (Axcelis Technologies, Inc.) | SOXX (iShares Semiconductor ETF) | |
|---|---|---|
| 1-year return | +49.4% | +110.0% |
| 5-year return | +140.5% | +247.5% |
| Volatility (ann.) | 51.6% | 35.2% |
| Beta vs S&P 500 | 1.57 | 1.93 |
| Max drawdown (3Y) | -78.0% | -41.4% |
| Market cap | $3.8B | – |
| P/E (trailing) | 40.4 | – |
| Dividend yield | 0.00% | 0.29% |
| Expense ratio | – | 0.33% |
| Assets under management | – | $44.7B |
| Sector / category | US Listed | ETF · Thematic |
On the fund side, SOXX sits in the Technology category at iShares, with $44.7B under management, 30 holdings, a 0.33% expense ratio, a 0.29% trailing dividend yield.
Year-by-year returns
| Year | ACLS | SOXX |
|---|---|---|
| 2022 | +6.4% | -35.1% |
| 2023 | +63.4% | +67.1% |
| 2024 | -46.1% | +12.9% |
| 2025 | +15.0% | +40.7% |
| 2026 | +52.4% | +74.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACLS and SOXX good diversifiers for each other?
Only partially. A correlation of 0.70 means ACLS and SOXX share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between ACLS and SOXX?
The ACLS/SOXX correlation stands at 0.70 on a 3-year window (1 year: 0.63, 5 years: 0.75), computed from weekly returns as of 2026-08-27.
Is SOXX a good diversifier for ACLS?
Only partially. A correlation of 0.70 means ACLS and SOXX share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.70 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/acls-vs-soxx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/acls-vs-soxx/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ACLS correlations · SOXX correlations
