SPY vs SRPT: Correlation
SPDR S&P 500 ETF Trust (SPY) and Sarepta Therapeutics, Inc. (SRPT) show a weak relationship: their 3-year correlation of weekly returns is 0.21.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and SRPT?
Over the past 3 years, SPY and SRPT moved with a correlation of 0.21, which is weak. The past 12 months show a tighter link (0.39) than the 3-year average (0.21). Over 5 years the correlation is 0.24, and the annualized covariance of weekly returns is 227.8 %².
By 3-year correlation, SRPT places #3184 of the 4755 assets tracked against SPY. Their 12-month results are close: +20.6% for SPY against +19.5% for SRPT. One caveat on sizing: SRPT is 5.2 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.
SPY vs SRPT: side by side
| SPY (SPDR S&P 500 ETF Trust) | SRPT (Sarepta Therapeutics, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | +19.5% |
| 5-year return | +82.4% | -71.5% |
| Volatility (ann.) | 14.5% | 75.7% |
| Beta vs S&P 500 | 1.00 | 1.09 |
| Max drawdown (3Y) | -18.8% | -92.7% |
| Market cap | – | $2.3B |
| 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 |
On the fund side, SPY sits in the Large Blend category at State Street Investment Management, with $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | SPY | SRPT |
|---|---|---|
| 2022 | -18.2% | +43.9% |
| 2023 | +26.2% | -25.6% |
| 2024 | +24.9% | +26.1% |
| 2025 | +17.7% | -82.3% |
| 2026 | +13.7% | +0.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and SRPT good diversifiers for each other?
Reasonably. At 0.21, SPY and SRPT keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between SPY and SRPT?
The SPY/SRPT correlation stands at 0.21 on a 3-year window (1 year: 0.39, 5 years: 0.24), computed from weekly returns as of 2026-08-27.
Is SRPT a good diversifier for SPY?
Reasonably. At 0.21, SPY and SRPT keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.21 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/spy-vs-srpt.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/spy-vs-srpt/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: SPY correlations · SRPT correlations
