ACAD vs IWM: Correlation
Measured on weekly returns over the past three years, ACADIA Pharmaceuticals Inc. (ACAD) and iShares Russell 2000 ETF (IWM) carry a correlation of 0.47, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACAD and IWM?
Across a 3-year window, the weekly returns of ACAD and IWM correlate at 0.47, moderate. Recent behaviour matches the longer record: 0.40 over 1 year against 0.47 over 3. Stretching to 5 years gives 0.37, with an annualized covariance of 459.8 %².
Among the 15 assets we track against ACAD, IWM ranks #4 by 3-year correlation. The last year tells two different stories: IWM led by 16.5 percentage points, +11.9% for ACAD against +28.4% for IWM. Risk is not evenly split, since ACAD carries 2.5 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.
ACAD vs IWM: side by side
| ACAD (ACADIA Pharmaceuticals Inc.) | IWM (iShares Russell 2000 ETF) | |
|---|---|---|
| 1-year return | +11.9% | +28.4% |
| 5-year return | +75.2% | +41.5% |
| Volatility (ann.) | 48.8% | 19.8% |
| Beta vs S&P 500 | 1.18 | 1.06 |
| Max drawdown (3Y) | -55.6% | -27.5% |
| Market cap | $5.1B | – |
| P/E (trailing) | 13.3 | – |
| Dividend yield | 0.00% | 0.91% |
| Expense ratio | – | 0.19% |
| Assets under management | – | $80.1B |
| Sector / category | US Listed | ETF · US Small & Mid Cap |
IWM, iShares's Small Blend fund, carries $80.1B under management, 1757 holdings, a 0.19% expense ratio, a 0.91% trailing dividend yield.
Year-by-year returns
| Year | ACAD | IWM |
|---|---|---|
| 2022 | -31.8% | -20.5% |
| 2023 | +96.7% | +16.8% |
| 2024 | -41.4% | +11.4% |
| 2025 | +45.6% | +12.7% |
| 2026 | +11.3% | +22.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
A structural note: 0.12% of IWM is ACAD itself, so the fund partly moves with the stock by construction.
Are ACAD and IWM good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.47 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between ACAD and IWM?
The ACAD/IWM correlation stands at 0.47 on a 3-year window (1 year: 0.40, 5 years: 0.37), computed from weekly returns as of 2026-08-27.
Is IWM a good diversifier for ACAD?
Yes, to a useful degree: a correlation of 0.47 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.47 mean?
On the −1 to +1 scale, 0.47 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/acad-vs-iwm.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/acad-vs-iwm/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACAD correlations · IWM correlations
