CI vs OLN: Correlation
How closely do Cigna (CI) and Olin Corporation (OLN) trade together? Their weekly returns over three years give a correlation of 0.38, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CI and OLN?
Across a 3-year window, the weekly returns of CI and OLN correlate at 0.38, moderate. Little has changed lately, as the 1-year reading of 0.45 lands near the 3-year figure. Stretching to 5 years gives 0.37, with an annualized covariance of 465.2 %².
Among the 30 assets we track against CI, OLN ranks #15 by 3-year correlation. Correlation aside, the last 12 months split them widely, with CI ahead by 17.9 points (-5.4% versus -23.3%). Risk is not evenly split, since OLN 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.
CI vs OLN: side by side
| CI (Cigna) | OLN (Olin Corporation) | |
|---|---|---|
| 1-year return | -5.4% | -23.3% |
| 5-year return | +46.7% | -62.2% |
| Volatility (ann.) | 26.7% | 45.4% |
| Beta vs S&P 500 | 0.22 | 1.04 |
| Max drawdown (3Y) | -32.1% | -69.3% |
| Market cap | $73.4B | – |
| P/E (trailing) | 11.6 | – |
| Dividend yield | 2.19% | 4.62% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | CI | OLN |
|---|---|---|
| 2022 | +46.7% | -6.6% |
| 2023 | -8.0% | +3.5% |
| 2024 | -6.3% | -36.3% |
| 2025 | +1.7% | -36.2% |
| 2026 | +2.0% | -15.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CI and OLN good diversifiers for each other?
Reasonably. At 0.38, CI and OLN keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between CI and OLN?
The CI/OLN correlation stands at 0.38 on a 3-year window (1 year: 0.45, 5 years: 0.37), computed from weekly returns as of 2026-08-27.
Is OLN a good diversifier for CI?
Reasonably. At 0.38, CI and OLN keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.38 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ci-vs-oln.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ci-vs-oln/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CI correlations · OLN correlations
