ACET vs SPY: Correlation
How closely do Adicet Bio, Inc. (ACET) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.34, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACET and SPY?
Across a 3-year window, the weekly returns of ACET and SPY correlate at 0.34, moderate. Little has changed lately, as the 1-year reading of 0.29 lands near the 3-year figure. Stretching to 5 years gives 0.31, with an annualized covariance of 392.6 %².
By 3-year correlation, SPY places #8 of the 15 assets tracked against ACET. The last year tells two different stories: SPY led by 46.1 percentage points, -25.5% for ACET against +20.6% for SPY. One caveat on sizing: ACET is 5.6 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.
ACET vs SPY: side by side
| ACET (Adicet Bio, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -25.5% | +20.6% |
| 5-year return | -93.0% | +82.4% |
| Volatility (ann.) | 80.6% | 14.5% |
| Beta vs S&P 500 | 1.88 | 1.00 |
| Max drawdown (3Y) | -88.9% | -18.8% |
| Market cap | $0.1B | – |
| P/E (trailing) | – | – |
| 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 | ACET | SPY |
|---|---|---|
| 2022 | -48.9% | -18.2% |
| 2023 | -78.9% | +26.2% |
| 2024 | -49.1% | +24.9% |
| 2025 | -45.3% | +17.7% |
| 2026 | +7.0% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACET and SPY good diversifiers for each other?
Reasonably. At 0.34, ACET and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ACET and SPY?
The ACET/SPY correlation stands at 0.34 on a 3-year window (1 year: 0.29, 5 years: 0.31), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for ACET?
Reasonably. At 0.34, ACET and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.34 mean?
On the −1 to +1 scale, 0.34 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/acet-vs-spy.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/acet-vs-spy/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ACET correlations · SPY correlations
