ABOS vs IBB: Correlation
How closely do Acumen Pharmaceuticals, Inc. (ABOS) and iShares Biotechnology ETF (IBB) trade together? Their weekly returns over three years give a correlation of 0.53, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ABOS and IBB?
On 3 years of weekly data the ABOS/IBB correlation comes out at 0.53, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.41 versus 0.53 over 3 years. The 5-year figure is 0.39, and annualized covariance runs at 906.8 %².
Few assets follow ABOS as closely as IBB, which ranks #3 of 19 tracked partners. Correlation aside, the last 12 months split them widely, with ABOS ahead by 62.6 points (+118.0% versus +55.4%). One caveat on sizing: ABOS is 4.0 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.
ABOS vs IBB: side by side
| ABOS (Acumen Pharmaceuticals, Inc.) | IBB (iShares Biotechnology ETF) | |
|---|---|---|
| 1-year return | +118.0% | +55.4% |
| 5-year return | -83.9% | +26.6% |
| Volatility (ann.) | 82.5% | 20.7% |
| Beta vs S&P 500 | 2.30 | 0.81 |
| Max drawdown (3Y) | -85.8% | -24.9% |
| Market cap | $0.2B | – |
| 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 | ABOS | IBB |
|---|---|---|
| 2022 | -20.1% | -13.7% |
| 2023 | -28.9% | +3.8% |
| 2024 | -55.2% | -2.4% |
| 2025 | +22.7% | +28.0% |
| 2026 | +43.6% | +27.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ABOS and IBB good diversifiers for each other?
Only partially. A correlation of 0.53 means ABOS 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 ABOS and IBB?
As of 2026-08-27, the correlation of weekly returns between ABOS and IBB is 0.53 over 3 years, 0.41 over 1 year and 0.39 over 5 years.
Is IBB a good diversifier for ABOS?
Only partially. A correlation of 0.53 means ABOS 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 0.53 mean?
A reading of 0.53 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/abos-vs-ibb.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/abos-vs-ibb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ABOS correlations · IBB correlations
