DORM vs SPY: Correlation
How closely do Dorman Products, Inc. (DORM) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.36, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are DORM and SPY?
Over the past 3 years, DORM and SPY moved with a correlation of 0.36, which is moderate. Little has changed lately, as the 1-year reading of 0.30 lands near the 3-year figure. Over 5 years the correlation is 0.37, and the annualized covariance of weekly returns is 163.3 %².
SPY is close to the least connected end of DORM's tracked universe, ranking #10 of 14. Correlation aside, the last 12 months split them widely, with SPY ahead by 42.2 points (-21.6% versus +20.6%). One caveat on sizing: DORM is 2.2 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
DORM vs SPY: side by side
| DORM (Dorman Products, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -21.6% | +20.6% |
| 5-year return | +34.2% | +82.4% |
| Volatility (ann.) | 31.5% | 14.5% |
| Beta vs S&P 500 | 0.78 | 1.00 |
| Max drawdown (3Y) | -39.6% | -18.8% |
| Market cap | $3.8B | – |
| P/E (trailing) | 17.9 | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | DORM | SPY |
|---|---|---|
| 2022 | -28.4% | -18.2% |
| 2023 | +3.1% | +26.2% |
| 2024 | +55.3% | +24.9% |
| 2025 | -4.9% | +17.7% |
| 2026 | +4.1% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are DORM and SPY good diversifiers for each other?
Reasonably. At 0.36, DORM and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between DORM and SPY?
Using weekly returns as of 2026-08-27: 0.36 over 3 years, with 0.30 over the last year and 0.37 over 5 years.
Is SPY a good diversifier for DORM?
Reasonably. At 0.36, DORM and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.36 mean?
On the −1 to +1 scale, 0.36 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.
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Related comparisons
Hubs: DORM correlations · SPY correlations
