QSI vs SES: Correlation
How closely do Quantum-Si Incorporated (QSI) and SES AI Corporation (SES) trade together? Their weekly returns over three years give a correlation of 0.72, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are QSI and SES?
Across a 3-year window, the weekly returns of QSI and SES correlate at 0.72, strong. The link has loosened recently: the 1-year correlation (0.45) runs below the 3-year figure (0.72). Stretching to 5 years gives 0.67, with an annualized covariance of 32268.0 %².
Few assets follow QSI as closely as SES, which ranks #2 of 25 tracked partners. Their recent paths diverged sharply: over the last 12 months QSI outperformed by 20.2 percentage points (-30.8% for QSI against -51.0% for SES). One caveat on sizing: SES is 1.9 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.
QSI vs SES: side by side
| QSI (Quantum-Si Incorporated) | SES (SES AI Corporation) | |
|---|---|---|
| 1-year return | -30.8% | -51.0% |
| 5-year return | -91.5% | -94.5% |
| Volatility (ann.) | 152.9% | 294.5% |
| Beta vs S&P 500 | 2.93 | 2.43 |
| Max drawdown (3Y) | -83.6% | -89.7% |
| Market cap | $0.2B | $0.2B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | QSI | SES |
|---|---|---|
| 2022 | -76.7% | -68.3% |
| 2023 | +9.8% | -41.9% |
| 2024 | +34.3% | +19.7% |
| 2025 | -59.3% | -17.8% |
| 2026 | -27.0% | -69.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are QSI and SES good diversifiers for each other?
Only partially. A correlation of 0.72 means QSI and SES share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between QSI and SES?
As of 2026-08-27, the correlation of weekly returns between QSI and SES is 0.72 over 3 years, 0.45 over 1 year and 0.67 over 5 years.
Is SES a good diversifier for QSI?
Only partially. A correlation of 0.72 means QSI and SES share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.72 mean?
A reading of 0.72 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/qsi-vs-ses.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/qsi-vs-ses/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: QSI correlations · SES correlations
