SSD vs ZWS: Correlation
How closely do Simpson Manufacturing Company, Inc. (SSD) and Zurn Elkay Water Solutions Corporation (ZWS) trade together? Their weekly returns over three years give a correlation of 0.63, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SSD and ZWS?
On 3 years of weekly data the SSD/ZWS correlation comes out at 0.63, strong. The relationship has been stable: the 1-year correlation (0.53) sits close to the 3-year figure. The 5-year figure is 0.57, and annualized covariance runs at 513.4 %².
Within SSD's tracked universe of 18 assets, ZWS comes in at #7 by 3-year correlation. The trailing year gives ZWS the advantage: -5.3% versus +5.3%, a 10.6-point spread.
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.
SSD vs ZWS: side by side
| SSD (Simpson Manufacturing Company, Inc.) | ZWS (Zurn Elkay Water Solutions Corporation) | |
|---|---|---|
| 1-year return | -5.3% | +5.3% |
| 5-year return | +65.7% | +71.6% |
| Volatility (ann.) | 29.5% | 27.7% |
| Beta vs S&P 500 | 0.89 | 0.89 |
| Max drawdown (3Y) | -34.4% | -30.2% |
| Market cap | $7.5B | $8.1B |
| P/E (trailing) | 20.3 | 30.5 |
| Dividend yield | 0.63% | 0.85% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | SSD | ZWS |
|---|---|---|
| 2022 | -35.6% | -41.5% |
| 2023 | +125.4% | +40.6% |
| 2024 | -15.7% | +28.1% |
| 2025 | -1.9% | +25.8% |
| 2026 | +13.6% | +5.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SSD and ZWS good diversifiers for each other?
To a limited degree. At 0.63 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 SSD and ZWS?
Using weekly returns as of 2026-08-27: 0.63 over 3 years, with 0.53 over the last year and 0.57 over 5 years.
Is ZWS a good diversifier for SSD?
To a limited degree. At 0.63 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 0.63 mean?
On the −1 to +1 scale, 0.63 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/ssd-vs-zws.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ssd-vs-zws/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: SSD correlations · ZWS correlations
