LLY vs REGN: Correlation
Measured on weekly returns over the past three years, Lilly (Eli) (LLY) and Regeneron Pharmaceuticals (REGN) carry a correlation of 0.41, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are LLY and REGN?
Over the past 3 years, LLY and REGN moved with a correlation of 0.41, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.24 versus 0.41 over 3 years. Over 5 years the correlation is 0.36, and the annualized covariance of weekly returns is 477.4 %².
Within LLY's tracked universe of 29 assets, REGN comes in at #8 by 3-year correlation. The last year tells two different stories: LLY led by 22.9 percentage points, +61.2% for LLY against +38.3% for REGN. The relationship is regime-dependent: the rolling one-year correlation swung between 0.16 and 0.69 over the past three years, so this pair behaves very differently depending on the market environment.
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.
LLY vs REGN: side by side
| LLY (Lilly (Eli)) | REGN (Regeneron Pharmaceuticals) | |
|---|---|---|
| 1-year return | +61.2% | +38.3% |
| 5-year return | +369.2% | +20.4% |
| Volatility (ann.) | 36.6% | 31.8% |
| Beta vs S&P 500 | 0.57 | 0.61 |
| Max drawdown (3Y) | -34.5% | -59.7% |
| Market cap | $1,048.8B | $83.2B |
| P/E (trailing) | 40.0 | 20.2 |
| Dividend yield | 0.54% | 0.45% |
| Sector / category | Health Care | Health Care |
Year-by-year returns
| Year | LLY | REGN |
|---|---|---|
| 2022 | +34.3% | +14.2% |
| 2023 | +60.9% | +21.7% |
| 2024 | +33.3% | -18.9% |
| 2025 | +40.2% | +9.0% |
| 2026 | +10.0% | +5.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are LLY and REGN good diversifiers for each other?
A fair diversifier. At 0.41, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between LLY and REGN?
The LLY/REGN correlation stands at 0.41 on a 3-year window (1 year: 0.24, 5 years: 0.36), computed from weekly returns as of 2026-08-27.
Is REGN a good diversifier for LLY?
A fair diversifier. At 0.41, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.41 mean?
On the −1 to +1 scale, 0.41 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/lly-vs-regn.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/lly-vs-regn/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: LLY correlations · REGN correlations
