ACAD vs SPY: Correlation
ACADIA Pharmaceuticals Inc. (ACAD) and SPDR S&P 500 ETF Trust (SPY) show a moderate relationship: their 3-year correlation of weekly returns is 0.35.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACAD and SPY?
Across a 3-year window, the weekly returns of ACAD and SPY correlate at 0.35, moderate. Recent behaviour matches the longer record: 0.35 over 1 year against 0.35 over 3. Stretching to 5 years gives 0.27, with an annualized covariance of 245.9 %².
By 3-year correlation, SPY places #9 of the 15 assets tracked against ACAD. The trailing year gives SPY the advantage: +11.9% versus +20.6%, a 8.7-point spread. Risk is not evenly split, since ACAD carries 3.4 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 SPY: side by side
| ACAD (ACADIA Pharmaceuticals Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +11.9% | +20.6% |
| 5-year return | +75.2% | +82.4% |
| Volatility (ann.) | 48.8% | 14.5% |
| Beta vs S&P 500 | 1.18 | 1.00 |
| Max drawdown (3Y) | -55.6% | -18.8% |
| Market cap | $5.1B | – |
| P/E (trailing) | 13.3 | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | ACAD | SPY |
|---|---|---|
| 2022 | -31.8% | -18.2% |
| 2023 | +96.7% | +26.2% |
| 2024 | -41.4% | +24.9% |
| 2025 | +45.6% | +17.7% |
| 2026 | +11.3% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACAD and SPY good diversifiers for each other?
A fair diversifier. At 0.35, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ACAD and SPY?
As of 2026-08-27, the correlation of weekly returns between ACAD and SPY is 0.35 over 3 years, 0.35 over 1 year and 0.27 over 5 years.
Is SPY a good diversifier for ACAD?
A fair diversifier. At 0.35, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.35 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
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Related comparisons
Hubs: ACAD correlations · SPY correlations
