ONT vs SPY: Correlation
How closely do Onterris, Inc. (ONT) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.27, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ONT and SPY?
Across a 3-year window, the weekly returns of ONT and SPY correlate at 0.27, weak. The link has loosened recently: the 1-year correlation (-0.04) runs below the 3-year figure (0.27). Stretching to 5 years gives 0.38, with an annualized covariance of 244.4 %².
Out of 13 assets tracked against ONT, SPY lands near the bottom at #9. Correlation aside, the last 12 months split them widely, with SPY ahead by 66.2 points (-45.6% versus +20.6%). One caveat on sizing: ONT is 4.4 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.
ONT vs SPY: side by side
| ONT (Onterris, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -45.6% | +20.6% |
| 5-year return | -66.3% | +82.4% |
| Volatility (ann.) | 63.4% | 14.5% |
| Beta vs S&P 500 | 1.17 | 1.00 |
| Max drawdown (3Y) | -78.4% | -18.8% |
| Market cap | $0.6B | – |
| 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 | ONT | SPY |
|---|---|---|
| 2022 | -37.0% | -18.2% |
| 2023 | -27.6% | +26.2% |
| 2024 | -42.3% | +24.9% |
| 2025 | +33.9% | +17.7% |
| 2026 | -34.2% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ONT and SPY good diversifiers for each other?
Reasonably. At 0.27, ONT and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ONT and SPY?
The ONT/SPY correlation stands at 0.27 on a 3-year window (1 year: -0.04, 5 years: 0.38), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for ONT?
Reasonably. At 0.27, ONT and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.27 mean?
On the −1 to +1 scale, 0.27 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: ONT correlations · SPY correlations
