RYTM vs SPY: Correlation
Measured on weekly returns over the past three years, Rhythm Pharmaceuticals, Inc. (RYTM) and SPDR S&P 500 ETF Trust (SPY) 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 RYTM and SPY?
Over the past 3 years, RYTM and SPY moved with a correlation of 0.47, which is moderate. The relationship has been stable: the 1-year correlation (0.41) sits close to the 3-year figure. Over 5 years the correlation is 0.27, and the annualized covariance of weekly returns is 400.7 %².
Within RYTM's tracked universe of 13 assets, SPY comes in at #6 by 3-year correlation. The trailing year gives SPY the advantage: +10.0% versus +20.6%, a 10.6-point spread. Note the risk asymmetry: RYTM runs 4.0 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.
RYTM vs SPY: side by side
| RYTM (Rhythm Pharmaceuticals, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +10.0% | +20.6% |
| 5-year return | +785.4% | +82.4% |
| Volatility (ann.) | 58.4% | 14.5% |
| Beta vs S&P 500 | 1.92 | 1.00 |
| Max drawdown (3Y) | -35.5% | -18.8% |
| Market cap | $7.7B | – |
| 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 | RYTM | SPY |
|---|---|---|
| 2022 | +191.8% | -18.2% |
| 2023 | +57.9% | +26.2% |
| 2024 | +21.8% | +24.9% |
| 2025 | +91.2% | +17.7% |
| 2026 | +5.1% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RYTM and SPY 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 RYTM and SPY?
As of 2026-08-27, the correlation of weekly returns between RYTM and SPY is 0.47 over 3 years, 0.41 over 1 year and 0.27 over 5 years.
Is SPY a good diversifier for RYTM?
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.
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Related comparisons
Hubs: RYTM correlations · SPY correlations
