CISS vs PDSB: Correlation
How closely do C3is Inc. (CISS) and PDS Biotechnology Corporation (PDSB) trade together? Their weekly returns over three years give a correlation of -0.39, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CISS and PDSB?
Over the past 3 years, CISS and PDSB moved with a correlation of -0.39, which is negative, meaning they tend to move in opposite directions. Lately the two have drifted apart, with the 1-year correlation at -0.54 versus -0.39 over 3 years. Over 5 years the correlation is n/a, and the annualized covariance of weekly returns is -80450.6 %².
Out of 42 assets tracked against CISS, PDSB lands near the bottom at #39. Their recent paths diverged sharply: over the last 12 months PDSB outperformed by 16.5 percentage points (-99.5% for CISS against -83.0% for PDSB). Risk is not evenly split, since CISS carries 21.6 times the volatility of the other side.
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.
CISS vs PDSB: side by side
| CISS (C3is Inc.) | PDSB (PDS Biotechnology Corporation) | |
|---|---|---|
| 1-year return | -99.5% | -83.0% |
| 5-year return | n/a | -98.5% |
| Volatility (ann.) | 2098.5% | 97.2% |
| Beta vs S&P 500 | 2.24 | 2.90 |
| Max drawdown (3Y) | -100.0% | -96.9% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CISS | PDSB |
|---|---|---|
| 2022 | – | +63.0% |
| 2023 | – | -62.3% |
| 2024 | -98.9% | -67.2% |
| 2025 | -97.3% | -52.8% |
| 2026 | -93.4% | -71.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CISS and PDSB good diversifiers for each other?
Yes: at -0.39, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between CISS and PDSB?
As of 2026-08-27, the correlation of weekly returns between CISS and PDSB is -0.39 over 3 years, -0.54 over 1 year and n/a over 5 years.
Is PDSB a good diversifier for CISS?
Yes: at -0.39, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.39 mean?
On the −1 to +1 scale, -0.39 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ciss-vs-pdsb.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ciss-vs-pdsb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CISS correlations · PDSB correlations
