AURA vs IBB: Correlation
Measured on weekly returns over the past three years, Aura Biosciences, Inc. (AURA) and iShares Biotechnology ETF (IBB) 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 AURA and IBB?
Across a 3-year window, the weekly returns of AURA and IBB correlate at 0.55, moderate. The relationship has been stable: the 1-year correlation (0.47) sits close to the 3-year figure. Stretching to 5 years gives 0.43, with an annualized covariance of 803.1 %².
By 3-year correlation, IBB places #4 of the 18 assets tracked against AURA. Correlation aside, the last 12 months split them widely, with IBB ahead by 35.8 points (+19.6% versus +55.4%). Note the risk asymmetry: AURA runs 3.4 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
AURA vs IBB: side by side
| AURA (Aura Biosciences, Inc.) | IBB (iShares Biotechnology ETF) | |
|---|---|---|
| 1-year return | +19.6% | +55.4% |
| 5-year return | -48.0% | +26.6% |
| Volatility (ann.) | 70.5% | 20.7% |
| Beta vs S&P 500 | 2.01 | 0.81 |
| Max drawdown (3Y) | -59.1% | -24.9% |
| Market cap | $0.8B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.22% |
| Expense ratio | – | 0.44% |
| Assets under management | – | $9.2B |
| Sector / category | US Listed | ETF · Thematic |
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 | AURA | IBB |
|---|---|---|
| 2022 | -38.2% | -13.7% |
| 2023 | -15.6% | +3.8% |
| 2024 | -7.2% | -2.4% |
| 2025 | -33.7% | +28.0% |
| 2026 | +41.3% | +27.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AURA and IBB good diversifiers for each other?
Only partially. A correlation of 0.55 means AURA and IBB 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 AURA and IBB?
The AURA/IBB correlation stands at 0.55 on a 3-year window (1 year: 0.47, 5 years: 0.43), computed from weekly returns as of 2026-08-27.
Is IBB a good diversifier for AURA?
Only partially. A correlation of 0.55 means AURA and IBB 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?
On the −1 to +1 scale, 0.55 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/aura-vs-ibb.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/aura-vs-ibb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: AURA correlations · IBB correlations
