MDY vs WSM: Correlation
SPDR S&P MidCap 400 ETF (MDY) and Williams-Sonoma, Inc. (WSM) show a strong relationship: their 3-year correlation of weekly returns is 0.60.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MDY and WSM?
Over the past 3 years, MDY and WSM moved with a correlation of 0.60, which is strong. The past 12 months show a tighter link (0.73) than the 3-year average (0.60). Over 5 years the correlation is 0.61, and the annualized covariance of weekly returns is 426.0 %².
By 3-year correlation, WSM places #185 of the 359 assets tracked against MDY. On 12-month performance WSM holds a 7.5-point edge, +18.3% against +25.8%. On a rolling one-year basis the correlation drifted between 0.47 and 0.74, a moderate band. One caveat on sizing: WSM is 2.6 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.
MDY vs WSM: side by side
| MDY (SPDR S&P MidCap 400 ETF) | WSM (Williams-Sonoma, Inc.) | |
|---|---|---|
| 1-year return | +18.3% | +25.8% |
| 5-year return | +47.5% | +182.0% |
| Volatility (ann.) | 16.5% | 43.0% |
| Beta vs S&P 500 | 0.91 | 1.33 |
| Max drawdown (3Y) | -24.0% | -36.8% |
| Market cap | – | $28.1B |
| P/E (trailing) | – | 24.4 |
| Dividend yield | 1.02% | 0.56% |
| Expense ratio | 0.23% | – |
| Assets under management | $26.5B | – |
| Sector / category | ETF · US Small & Mid Cap | Consumer Discretionary |
On the fund side, MDY sits in the Mid-Cap Blend category at State Street Investment Management, with $26.5B under management, 400 holdings, a 0.23% expense ratio, a 1.02% trailing dividend yield.
Year-by-year returns
| Year | MDY | WSM |
|---|---|---|
| 2022 | -13.3% | -30.5% |
| 2023 | +16.1% | +80.2% |
| 2024 | +13.6% | +86.6% |
| 2025 | +7.2% | -2.1% |
| 2026 | +16.4% | +34.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MDY and WSM good diversifiers for each other?
To a limited degree. At 0.60 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 MDY and WSM?
Using weekly returns as of 2026-08-27: 0.60 over 3 years, with 0.73 over the last year and 0.61 over 5 years.
Is WSM a good diversifier for MDY?
To a limited degree. At 0.60 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 0.60 mean?
A reading of 0.60 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/mdy-vs-wsm.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/mdy-vs-wsm/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MDY correlations · WSM correlations
