FSS vs SSD: Correlation
Federal Signal Corporation (FSS) and Simpson Manufacturing Company, Inc. (SSD) show a strong relationship: their 3-year correlation of weekly returns is 0.62.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are FSS and SSD?
Across a 3-year window, the weekly returns of FSS and SSD correlate at 0.62, strong. The relationship has been stable: the 1-year correlation (0.62) sits close to the 3-year figure. Stretching to 5 years gives 0.58, with an annualized covariance of 565.8 %².
Few assets follow FSS as closely as SSD, which ranks #3 of 15 tracked partners. Neither side won the trailing year by much: -5.3% against -5.3%.
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.
FSS vs SSD: side by side
| FSS (Federal Signal Corporation) | SSD (Simpson Manufacturing Company, Inc.) | |
|---|---|---|
| 1-year return | -5.3% | -5.3% |
| 5-year return | +203.9% | +65.7% |
| Volatility (ann.) | 31.2% | 29.5% |
| Beta vs S&P 500 | 1.02 | 0.89 |
| Max drawdown (3Y) | -31.5% | -34.4% |
| Market cap | $7.3B | $7.5B |
| P/E (trailing) | 26.2 | 20.3 |
| Dividend yield | 0.48% | 0.63% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | FSS | SSD |
|---|---|---|
| 2022 | +8.2% | -35.6% |
| 2023 | +66.3% | +125.4% |
| 2024 | +21.1% | -15.7% |
| 2025 | +18.2% | -1.9% |
| 2026 | +11.3% | +13.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are FSS and SSD good diversifiers for each other?
To a limited degree. At 0.62 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 FSS and SSD?
The FSS/SSD correlation stands at 0.62 on a 3-year window (1 year: 0.62, 5 years: 0.58), computed from weekly returns as of 2026-08-27.
Is SSD a good diversifier for FSS?
To a limited degree. At 0.62 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 0.62 mean?
A reading of 0.62 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/fss-vs-ssd.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/fss-vs-ssd/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: FSS correlations · SSD correlations
