ACM vs PACS: Correlation
Measured on weekly returns over the past three years, AECOM (ACM) and PACS Group, Inc. (PACS) carry a correlation of -0.36, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACM and PACS?
Over the past 3 years, ACM and PACS moved with a correlation of -0.36, which is negative, meaning they tend to move in opposite directions. The past 12 months show a weaker link (-0.49) than the 3-year average (-0.36). Over 5 years the correlation is n/a, and the annualized covariance of weekly returns is -1329.6 %².
PACS is close to the least connected end of ACM's tracked universe, ranking #16 of 16. Their recent paths diverged sharply: over the last 12 months PACS outperformed by 319.6 percentage points (-46.6% for ACM against +273.0% for PACS). Risk is not evenly split, since PACS carries 4.1 times the volatility of the other side.
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 PACS: side by side
| ACM (AECOM) | PACS (PACS Group, Inc.) | |
|---|---|---|
| 1-year return | -46.6% | +273.0% |
| 5-year return | +5.2% | n/a |
| Volatility (ann.) | 29.1% | 120.5% |
| Beta vs S&P 500 | 0.79 | 0.06 |
| Max drawdown (3Y) | -54.1% | -82.0% |
| Market cap | $8.5B | $7.0B |
| P/E (trailing) | 22.9 | 25.9 |
| Dividend yield | 1.83% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ACM | PACS |
|---|---|---|
| 2022 | +10.7% | – |
| 2023 | +9.8% | – |
| 2024 | +16.7% | – |
| 2025 | -9.9% | +192.8% |
| 2026 | -29.7% | +15.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACM and PACS good diversifiers for each other?
Yes. With a correlation of -0.36, ACM and PACS have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between ACM and PACS?
Using weekly returns as of 2026-08-27: -0.36 over 3 years, with -0.49 over the last year and n/a over 5 years.
Is PACS a good diversifier for ACM?
Yes. With a correlation of -0.36, ACM and PACS have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.36 mean?
A reading of -0.36 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/acm-vs-pacs.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/acm-vs-pacs/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACM correlations · PACS correlations
