DUOL vs SPY: Correlation
Measured on weekly returns over the past three years, Duolingo, Inc. (DUOL) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.36, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are DUOL and SPY?
On 3 years of weekly data the DUOL/SPY correlation comes out at 0.36, moderate. The relationship has been stable: the 1-year correlation (0.26) sits close to the 3-year figure. The 5-year figure is 0.35, and annualized covariance runs at 323.3 %².
Within DUOL's tracked universe of 13 assets, SPY comes in at #8 by 3-year correlation. Correlation aside, the last 12 months split them widely, with SPY ahead by 75.7 points (-55.1% versus +20.6%). One caveat on sizing: DUOL is 4.3 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.
DUOL vs SPY: side by side
| DUOL (Duolingo, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -55.1% | +20.6% |
| 5-year return | +11.0% | +82.4% |
| Volatility (ann.) | 62.1% | 14.5% |
| Beta vs S&P 500 | 1.55 | 1.00 |
| Max drawdown (3Y) | -83.3% | -18.8% |
| Market cap | $6.7B | – |
| P/E (trailing) | 16.6 | – |
| 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 | DUOL | SPY |
|---|---|---|
| 2022 | -33.0% | -18.2% |
| 2023 | +218.9% | +26.2% |
| 2024 | +42.9% | +24.9% |
| 2025 | -45.9% | +17.7% |
| 2026 | -18.6% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are DUOL and SPY good diversifiers for each other?
Reasonably. At 0.36, DUOL and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between DUOL and SPY?
Using weekly returns as of 2026-08-27: 0.36 over 3 years, with 0.26 over the last year and 0.35 over 5 years.
Is SPY a good diversifier for DUOL?
Reasonably. At 0.36, DUOL and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.36 mean?
On the −1 to +1 scale, 0.36 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: DUOL correlations · SPY correlations
