IBB vs REGN: Correlation
Measured on weekly returns over the past three years, iShares Biotechnology ETF (IBB) and Regeneron Pharmaceuticals (REGN) carry a correlation of 0.55, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IBB and REGN?
On 3 years of weekly data the IBB/REGN correlation comes out at 0.55, moderate. The link has loosened recently: the 1-year correlation (0.38) runs below the 3-year figure (0.55). The 5-year figure is 0.54, and annualized covariance runs at 359.5 %².
By 3-year correlation, REGN places #67 of the 168 assets tracked against IBB. Their recent paths diverged sharply: over the last 12 months IBB outperformed by 17.1 percentage points (+55.4% for IBB against +38.3% for REGN). The rolling one-year correlation moved between 0.39 and 0.71 over the past three years, a moderate range. Risk is not evenly split, since REGN carries 1.5 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.
IBB vs REGN: side by side
| IBB (iShares Biotechnology ETF) | REGN (Regeneron Pharmaceuticals) | |
|---|---|---|
| 1-year return | +55.4% | +38.3% |
| 5-year return | +26.6% | +20.4% |
| Volatility (ann.) | 20.7% | 31.8% |
| Beta vs S&P 500 | 0.81 | 0.61 |
| Max drawdown (3Y) | -24.9% | -59.7% |
| Market cap | – | $83.2B |
| P/E (trailing) | – | 20.2 |
| Dividend yield | 0.22% | 0.45% |
| Expense ratio | 0.44% | – |
| Assets under management | $9.2B | – |
| Sector / category | ETF · Thematic | Health Care |
On the fund side, IBB sits in the Health category at iShares, with $9.2B under management, 235 holdings, a 0.44% expense ratio, a 0.22% trailing dividend yield.
Year-by-year returns
| Year | IBB | REGN |
|---|---|---|
| 2022 | -13.7% | +14.2% |
| 2023 | +3.8% | +21.7% |
| 2024 | -2.4% | -18.9% |
| 2025 | +28.0% | +9.0% |
| 2026 | +27.4% | +5.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
REGN represents 5.68% of IBB's portfolio, so part of any move in IBB is REGN itself, and the correlation between them is partly mechanical.
Are IBB and REGN good diversifiers for each other?
Only partially. A correlation of 0.55 means IBB and REGN 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 IBB and REGN?
The IBB/REGN correlation stands at 0.55 on a 3-year window (1 year: 0.38, 5 years: 0.54), computed from weekly returns as of 2026-08-27.
Is REGN a good diversifier for IBB?
Only partially. A correlation of 0.55 means IBB and REGN share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.55 mean?
A reading of 0.55 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ibb-vs-regn.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ibb-vs-regn/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: IBB correlations · REGN correlations
