IBB vs RGNX: Correlation
Measured on weekly returns over the past three years, iShares Biotechnology ETF (IBB) and REGENXBIO Inc. (RGNX) carry a correlation of 0.57, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IBB and RGNX?
On 3 years of weekly data the IBB/RGNX correlation comes out at 0.57, moderate. Recent behaviour matches the longer record: 0.57 over 1 year against 0.57 over 3. The 5-year figure is 0.53, and annualized covariance runs at 1000.5 %².
Among the 168 assets we track against IBB, RGNX ranks #53 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months IBB outperformed by 49.2 percentage points (+55.4% for IBB against +6.2% for RGNX). Risk is not evenly split, since RGNX carries 4.1 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 RGNX: side by side
| IBB (iShares Biotechnology ETF) | RGNX (REGENXBIO Inc.) | |
|---|---|---|
| 1-year return | +55.4% | +6.2% |
| 5-year return | +26.6% | -70.5% |
| Volatility (ann.) | 20.7% | 84.1% |
| Beta vs S&P 500 | 0.81 | 2.28 |
| Max drawdown (3Y) | -24.9% | -78.4% |
| Market cap | – | $0.6B |
| P/E (trailing) | – | – |
| Dividend yield | 0.22% | 0.00% |
| Expense ratio | 0.44% | – |
| Assets under management | $9.2B | – |
| Sector / category | ETF · Thematic | US Listed |
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 | RGNX |
|---|---|---|
| 2022 | -13.7% | -30.6% |
| 2023 | +3.8% | -20.9% |
| 2024 | -2.4% | -56.9% |
| 2025 | +28.0% | +86.3% |
| 2026 | +27.4% | -34.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IBB and RGNX good diversifiers for each other?
Somewhat, no more. With 0.57 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between IBB and RGNX?
Using weekly returns as of 2026-08-27: 0.57 over 3 years, with 0.57 over the last year and 0.53 over 5 years.
Is RGNX a good diversifier for IBB?
Somewhat, no more. With 0.57 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.57 mean?
On the −1 to +1 scale, 0.57 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/ibb-vs-rgnx.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/ibb-vs-rgnx/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: IBB correlations · RGNX correlations
