IWM vs SGI: Correlation
How closely do iShares Russell 2000 ETF (IWM) and Somnigroup International Inc. (SGI) trade together? Their weekly returns over three years give a correlation of 0.66, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IWM and SGI?
Over the past 3 years, IWM and SGI moved with a correlation of 0.66, which is strong. Little has changed lately, as the 1-year reading of 0.57 lands near the 3-year figure. Over 5 years the correlation is 0.66, and the annualized covariance of weekly returns is 443.8 %².
Among the 320 assets we track against IWM, SGI ranks #64 by 3-year correlation. The last year tells two different stories: IWM led by 53.8 percentage points, +28.4% for IWM against -25.4% for SGI. Risk is not evenly split, since SGI carries 1.7 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.
IWM vs SGI: side by side
| IWM (iShares Russell 2000 ETF) | SGI (Somnigroup International Inc.) | |
|---|---|---|
| 1-year return | +28.4% | -25.4% |
| 5-year return | +41.5% | +44.9% |
| Volatility (ann.) | 19.8% | 33.8% |
| Beta vs S&P 500 | 1.06 | 1.02 |
| Max drawdown (3Y) | -27.5% | -37.1% |
| Market cap | – | $13.1B |
| P/E (trailing) | – | 24.8 |
| Dividend yield | 0.91% | 1.02% |
| Expense ratio | 0.19% | – |
| Assets under management | $80.1B | – |
| Sector / category | ETF · US Small & Mid Cap | US Listed |
IWM is a Small Blend fund from iShares: $80.1B under management, 1757 holdings, a 0.19% expense ratio, a 0.91% trailing dividend yield.
Year-by-year returns
| Year | IWM | SGI |
|---|---|---|
| 2022 | -20.5% | -26.0% |
| 2023 | +16.8% | +50.1% |
| 2024 | +11.4% | +12.3% |
| 2025 | +12.7% | +58.8% |
| 2026 | +22.3% | -29.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IWM and SGI good diversifiers for each other?
Only partially. A correlation of 0.66 means IWM and SGI 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 IWM and SGI?
Using weekly returns as of 2026-08-27: 0.66 over 3 years, with 0.57 over the last year and 0.66 over 5 years.
Is SGI a good diversifier for IWM?
Only partially. A correlation of 0.66 means IWM and SGI share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.66 mean?
On the −1 to +1 scale, 0.66 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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Hubs: IWM correlations · SGI correlations
