IBB vs RCKT: Correlation
Measured on weekly returns over the past three years, iShares Biotechnology ETF (IBB) and Rocket Pharmaceuticals, Inc. (RCKT) carry a correlation of 0.48, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IBB and RCKT?
Over the past 3 years, IBB and RCKT moved with a correlation of 0.48, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.34 versus 0.48 over 3 years. Over 5 years the correlation is 0.50, and the annualized covariance of weekly returns is 782.6 %².
Among the 168 assets we track against IBB, RCKT ranks #110 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months IBB outperformed by 46.4 percentage points (+55.4% for IBB against +9.0% for RCKT). One caveat on sizing: RCKT is 3.8 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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 RCKT: side by side
| IBB (iShares Biotechnology ETF) | RCKT (Rocket Pharmaceuticals, Inc.) | |
|---|---|---|
| 1-year return | +55.4% | +9.0% |
| 5-year return | +26.6% | -89.2% |
| Volatility (ann.) | 20.7% | 78.7% |
| Beta vs S&P 500 | 0.81 | 1.78 |
| Max drawdown (3Y) | -24.9% | -92.7% |
| Market cap | – | $0.4B |
| P/E (trailing) | – | – |
| Dividend yield | 0.22% | 0.00% |
| Expense ratio | 0.44% | – |
| Assets under management | $9.2B | – |
| Sector / category | ETF · Thematic | US Listed |
IBB, iShares's Health fund, carries $9.2B under management, 235 holdings, a 0.44% expense ratio, a 0.22% trailing dividend yield.
Year-by-year returns
| Year | IBB | RCKT |
|---|---|---|
| 2022 | -13.7% | -10.4% |
| 2023 | +3.8% | +53.1% |
| 2024 | -2.4% | -58.1% |
| 2025 | +28.0% | -72.1% |
| 2026 | +27.4% | +3.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IBB and RCKT good diversifiers for each other?
Reasonably. At 0.48, IBB and RCKT keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between IBB and RCKT?
Using weekly returns as of 2026-08-27: 0.48 over 3 years, with 0.34 over the last year and 0.50 over 5 years.
Is RCKT a good diversifier for IBB?
Reasonably. At 0.48, IBB and RCKT keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.48 mean?
A reading of 0.48 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-rckt.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ibb-vs-rckt/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: IBB correlations · RCKT correlations
