IOSP vs IWM: Correlation
Innospec Inc. (IOSP) and iShares Russell 2000 ETF (IWM) show a strong relationship: their 3-year correlation of weekly returns is 0.72.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IOSP and IWM?
Across a 3-year window, the weekly returns of IOSP and IWM correlate at 0.72, strong. The past 12 months show a weaker link (0.57) than the 3-year average (0.72). Stretching to 5 years gives 0.63, with an annualized covariance of 377.7 %².
Few assets follow IOSP as closely as IWM, which ranks #3 of 35 tracked partners. Correlation aside, the last 12 months split them widely, with IWM ahead by 17.1 points (+11.3% versus +28.4%).
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.
IOSP vs IWM: side by side
| IOSP (Innospec Inc.) | IWM (iShares Russell 2000 ETF) | |
|---|---|---|
| 1-year return | +11.3% | +28.4% |
| 5-year return | +10.2% | +41.5% |
| Volatility (ann.) | 26.6% | 19.8% |
| Beta vs S&P 500 | 0.94 | 1.06 |
| Max drawdown (3Y) | -48.4% | -27.5% |
| Market cap | $2.3B | – |
| P/E (trailing) | 19.5 | – |
| Dividend yield | 1.87% | 0.91% |
| Expense ratio | – | 0.19% |
| Assets under management | – | $80.1B |
| Sector / category | US Listed | ETF · US Small & Mid Cap |
IWM, iShares's Small Blend fund, carries $80.1B under management, 1757 holdings, a 0.19% expense ratio, a 0.91% trailing dividend yield.
Year-by-year returns
| Year | IOSP | IWM |
|---|---|---|
| 2022 | +15.2% | -20.5% |
| 2023 | +21.5% | +16.8% |
| 2024 | -9.6% | +11.4% |
| 2025 | -28.9% | +12.7% |
| 2026 | +26.0% | +22.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
Keep in mind that IWM holds IOSP at a 0.08% weight, which makes a slice of this correlation mechanical rather than coincidental.
Are IOSP and IWM good diversifiers for each other?
Only partially. A correlation of 0.72 means IOSP and IWM 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 IOSP and IWM?
As of 2026-08-27, the correlation of weekly returns between IOSP and IWM is 0.72 over 3 years, 0.57 over 1 year and 0.63 over 5 years.
Is IWM a good diversifier for IOSP?
Only partially. A correlation of 0.72 means IOSP and IWM share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.72 mean?
On the −1 to +1 scale, 0.72 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/iosp-vs-iwm.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/iosp-vs-iwm/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: IOSP correlations · IWM correlations
