IOSP vs SW: Correlation
Innospec Inc. (IOSP) and Smurfit Westrock (SW) show a moderate relationship: their 3-year correlation of weekly returns is 0.55.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IOSP and SW?
Over the past 3 years, IOSP and SW moved with a correlation of 0.55, which is moderate. Recent behaviour matches the longer record: 0.62 over 1 year against 0.55 over 3. Over 5 years the correlation is 0.49, and the annualized covariance of weekly returns is 590.7 %².
By 3-year correlation, SW places #17 of the 35 assets tracked against IOSP. Their 12-month results are close: +11.3% for IOSP against +9.7% for SW. One caveat on sizing: SW is 1.5 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.
IOSP vs SW: side by side
| IOSP (Innospec Inc.) | SW (Smurfit Westrock) | |
|---|---|---|
| 1-year return | +11.3% | +9.7% |
| 5-year return | +10.2% | +2.6% |
| Volatility (ann.) | 26.6% | 40.1% |
| Beta vs S&P 500 | 0.94 | 0.92 |
| Max drawdown (3Y) | -48.4% | -40.5% |
| Market cap | $2.3B | $25.5B |
| P/E (trailing) | 19.5 | 51.7 |
| Dividend yield | 1.87% | 3.57% |
| Sector / category | US Listed | Materials |
Year-by-year returns
| Year | IOSP | SW |
|---|---|---|
| 2022 | +15.2% | -28.0% |
| 2023 | +21.5% | +14.1% |
| 2024 | -9.6% | +37.6% |
| 2025 | -28.9% | -26.2% |
| 2026 | +26.0% | +29.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IOSP and SW good diversifiers for each other?
Somewhat, no more. With 0.55 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between IOSP and SW?
As of 2026-08-27, the correlation of weekly returns between IOSP and SW is 0.55 over 3 years, 0.62 over 1 year and 0.49 over 5 years.
Is SW a good diversifier for IOSP?
Somewhat, no more. With 0.55 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.55 mean?
On the −1 to +1 scale, 0.55 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-sw.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/iosp-vs-sw/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: IOSP correlations · SW correlations
