IOSP vs PCRX: Correlation
Innospec Inc. (IOSP) and Pacira BioSciences, Inc. (PCRX) show a moderate relationship: their 3-year correlation of weekly returns is 0.40.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IOSP and PCRX?
Across a 3-year window, the weekly returns of IOSP and PCRX correlate at 0.40, moderate. The past 12 months show a weaker link (0.13) than the 3-year average (0.40). Stretching to 5 years gives 0.32, with an annualized covariance of 527.7 %².
Among the 35 assets we track against IOSP, PCRX ranks #30 by 3-year correlation. The trailing year gives IOSP the advantage: +11.3% versus -1.1%, a 12.4-point spread. Note the risk asymmetry: PCRX runs 1.9 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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 PCRX: side by side
| IOSP (Innospec Inc.) | PCRX (Pacira BioSciences, Inc.) | |
|---|---|---|
| 1-year return | +11.3% | -1.1% |
| 5-year return | +10.2% | -56.2% |
| Volatility (ann.) | 26.6% | 50.0% |
| Beta vs S&P 500 | 0.94 | 0.71 |
| Max drawdown (3Y) | -48.4% | -67.9% |
| Market cap | $2.3B | $1.0B |
| P/E (trailing) | 19.5 | 73.8 |
| Dividend yield | 1.87% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | IOSP | PCRX |
|---|---|---|
| 2022 | +15.2% | -35.8% |
| 2023 | +21.5% | -12.6% |
| 2024 | -9.6% | -44.2% |
| 2025 | -28.9% | +37.4% |
| 2026 | +26.0% | -0.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IOSP and PCRX good diversifiers for each other?
Reasonably. At 0.40, IOSP and PCRX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between IOSP and PCRX?
As of 2026-08-27, the correlation of weekly returns between IOSP and PCRX is 0.40 over 3 years, 0.13 over 1 year and 0.32 over 5 years.
Is PCRX a good diversifier for IOSP?
Reasonably. At 0.40, IOSP and PCRX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.40 mean?
On the −1 to +1 scale, 0.40 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-pcrx.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/iosp-vs-pcrx/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: IOSP correlations · PCRX correlations
