MKSI vs UCTT: Correlation
How closely do MKS Inc. (MKSI) and Ultra Clean Holdings, Inc. (UCTT) trade together? Their weekly returns over three years give a correlation of 0.80, which is very strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MKSI and UCTT?
On 3 years of weekly data the MKSI/UCTT correlation comes out at 0.80, very strong, meaning they move nearly in lockstep. The relationship has been stable: the 1-year correlation (0.81) sits close to the 3-year figure. The 5-year figure is 0.78, and annualized covariance runs at 2564.4 %².
By 3-year correlation, UCTT places #4 of the 41 assets tracked against MKSI. Their recent paths diverged sharply: over the last 12 months UCTT outperformed by 54.1 percentage points (+157.5% for MKSI against +211.6% for UCTT).
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.
MKSI vs UCTT: side by side
| MKSI (MKS Inc.) | UCTT (Ultra Clean Holdings, Inc.) | |
|---|---|---|
| 1-year return | +157.5% | +211.6% |
| 5-year return | +88.2% | +57.9% |
| Volatility (ann.) | 50.8% | 62.8% |
| Beta vs S&P 500 | 2.39 | 2.28 |
| Max drawdown (3Y) | -59.1% | -68.2% |
| Market cap | $18.3B | $3.4B |
| P/E (trailing) | 43.3 | – |
| Dividend yield | 0.35% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | MKSI | UCTT |
|---|---|---|
| 2022 | -51.0% | -42.2% |
| 2023 | +22.6% | +3.0% |
| 2024 | +2.2% | +5.3% |
| 2025 | +54.4% | -29.5% |
| 2026 | +70.0% | +195.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MKSI and UCTT good diversifiers for each other?
No: a correlation of 0.80 means MKSI and UCTT tend to fall together, which is precisely when diversification is supposed to help.
FAQ
What is the correlation between MKSI and UCTT?
As of 2026-08-27, the correlation of weekly returns between MKSI and UCTT is 0.80 over 3 years, 0.81 over 1 year and 0.78 over 5 years.
Is UCTT a good diversifier for MKSI?
No: a correlation of 0.80 means MKSI and UCTT tend to fall together, which is precisely when diversification is supposed to help.
What does a correlation of 0.80 mean?
A reading of 0.80 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/mksi-vs-uctt.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/mksi-vs-uctt/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: MKSI correlations · UCTT correlations
