SPY vs STOK: Correlation
Measured on weekly returns over the past three years, SPDR S&P 500 ETF Trust (SPY) and Stoke Therapeutics, Inc. (STOK) carry a correlation of 0.28, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and STOK?
On 3 years of weekly data the SPY/STOK correlation comes out at 0.28, weak. Recent behaviour matches the longer record: 0.23 over 1 year against 0.28 over 3. The 5-year figure is 0.30, and annualized covariance runs at 376.2 %².
Within SPY's tracked universe of 4755 assets, STOK comes in at #2480 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months STOK outperformed by 48.3 percentage points (+20.6% for SPY against +68.9% for STOK). Note the risk asymmetry: STOK runs 6.4 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.
SPY vs STOK: side by side
| SPY (SPDR S&P 500 ETF Trust) | STOK (Stoke Therapeutics, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | +68.9% |
| 5-year return | +82.4% | +23.8% |
| Volatility (ann.) | 14.5% | 93.2% |
| Beta vs S&P 500 | 1.00 | 1.80 |
| Max drawdown (3Y) | -18.8% | -66.3% |
| Market cap | – | $2.1B |
| P/E (trailing) | – | – |
| Dividend yield | 1.01% | 0.00% |
| Expense ratio | 0.09% | – |
| Assets under management | $795.3B | – |
| Sector / category | ETF · US Large Cap | US Listed |
SPY, State Street Investment Management's Large Blend fund, carries $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | SPY | STOK |
|---|---|---|
| 2022 | -18.2% | -61.5% |
| 2023 | +26.2% | -43.0% |
| 2024 | +24.9% | +109.7% |
| 2025 | +17.7% | +187.8% |
| 2026 | +13.7% | +2.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and STOK good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.28 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between SPY and STOK?
The SPY/STOK correlation stands at 0.28 on a 3-year window (1 year: 0.23, 5 years: 0.30), computed from weekly returns as of 2026-08-27.
Is STOK a good diversifier for SPY?
Yes, to a useful degree: a correlation of 0.28 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.28 mean?
On the −1 to +1 scale, 0.28 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/spy-vs-stok.json
Embed this badge (it refreshes with the data), with attribution:
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Related comparisons
Hubs: SPY correlations · STOK correlations
