EXP vs MLM: Correlation
Eagle Materials Inc (EXP) and Martin Marietta Materials (MLM) show a strong relationship: their 3-year correlation of weekly returns is 0.78.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are EXP and MLM?
On 3 years of weekly data the EXP/MLM correlation comes out at 0.78, strong. The relationship has been stable: the 1-year correlation (0.75) sits close to the 3-year figure. The 5-year figure is 0.78, and annualized covariance runs at 647.3 %².
Few assets follow EXP as closely as MLM, which ranks #1 of 24 tracked partners. Twelve-month performance is nearly a tie, at -15.7% for EXP and -13.8% for MLM.
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.
EXP vs MLM: side by side
| EXP (Eagle Materials Inc) | MLM (Martin Marietta Materials) | |
|---|---|---|
| 1-year return | -15.7% | -13.8% |
| 5-year return | +29.5% | +42.4% |
| Volatility (ann.) | 34.8% | 23.9% |
| Beta vs S&P 500 | 1.21 | 0.85 |
| Max drawdown (3Y) | -44.7% | -26.8% |
| Market cap | $6.1B | $37.5B |
| P/E (trailing) | 15.6 | 34.4 |
| Dividend yield | 0.50% | 0.62% |
| Sector / category | US Listed | Materials |
Year-by-year returns
| Year | EXP | MLM |
|---|---|---|
| 2022 | -19.6% | -22.7% |
| 2023 | +53.6% | +48.6% |
| 2024 | +22.1% | +4.1% |
| 2025 | -15.9% | +21.3% |
| 2026 | -4.1% | -14.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are EXP and MLM good diversifiers for each other?
Only partially. A correlation of 0.78 means EXP and MLM 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 EXP and MLM?
The EXP/MLM correlation stands at 0.78 on a 3-year window (1 year: 0.75, 5 years: 0.78), computed from weekly returns as of 2026-08-27.
Is MLM a good diversifier for EXP?
Only partially. A correlation of 0.78 means EXP and MLM share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.78 mean?
On the −1 to +1 scale, 0.78 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/exp-vs-mlm.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/exp-vs-mlm/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: EXP correlations · MLM correlations
