ACM vs STN: Correlation
How closely do AECOM (ACM) and Stantec Inc (STN) trade together? Their weekly returns over three years give a correlation of 0.58, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACM and STN?
Across a 3-year window, the weekly returns of ACM and STN correlate at 0.58, moderate. Lately the two have moved closer together, with the 1-year correlation at 0.69 versus 0.58 over 3 years. Stretching to 5 years gives 0.61, with an annualized covariance of 404.2 %².
STN is one of the assets that tracks ACM most closely: it ranks #2 out of the 16 assets we track against ACM. The last year tells two different stories: STN led by 15.2 percentage points, -46.6% for ACM against -31.4% for STN.
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.
ACM vs STN: side by side
| ACM (AECOM) | STN (Stantec Inc) | |
|---|---|---|
| 1-year return | -46.6% | -31.4% |
| 5-year return | +5.2% | +62.2% |
| Volatility (ann.) | 29.1% | 24.1% |
| Beta vs S&P 500 | 0.79 | 0.70 |
| Max drawdown (3Y) | -54.1% | -41.0% |
| Market cap | $8.5B | $8.4B |
| P/E (trailing) | 22.9 | 23.6 |
| Dividend yield | 1.83% | 1.25% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ACM | STN |
|---|---|---|
| 2022 | +10.7% | -13.8% |
| 2023 | +9.8% | +68.8% |
| 2024 | +16.7% | -1.4% |
| 2025 | -9.9% | +20.7% |
| 2026 | -29.7% | -20.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACM and STN good diversifiers for each other?
Only partially. A correlation of 0.58 means ACM and STN 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 ACM and STN?
As of 2026-08-27, the correlation of weekly returns between ACM and STN is 0.58 over 3 years, 0.69 over 1 year and 0.61 over 5 years.
Is STN a good diversifier for ACM?
Only partially. A correlation of 0.58 means ACM and STN share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.58 mean?
On the −1 to +1 scale, 0.58 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/acm-vs-stn.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/acm-vs-stn/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ACM correlations · STN correlations
