CTRM vs ICU: Correlation
How closely do Castor Maritime Inc. (CTRM) and SeaStar Medical Holding Corporation (ICU) trade together? Their weekly returns over three years give a correlation of 0.26, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CTRM and ICU?
On 3 years of weekly data the CTRM/ICU correlation comes out at 0.26, weak. Recent behaviour matches the longer record: 0.17 over 1 year against 0.26 over 3. The 5-year figure is 0.21, and annualized covariance runs at 2095.5 %².
Among the 12 assets we track against CTRM, ICU ranks #6 by 3-year correlation. Correlation aside, the last 12 months split them widely, with CTRM ahead by 75.5 points (+12.1% versus -63.4%). One caveat on sizing: ICU is 3.0 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.
CTRM vs ICU: side by side
| CTRM (Castor Maritime Inc.) | ICU (SeaStar Medical Holding Corporation) | |
|---|---|---|
| 1-year return | +12.1% | -63.4% |
| 5-year return | -89.2% | -99.9% |
| Volatility (ann.) | 51.7% | 156.9% |
| Beta vs S&P 500 | 0.35 | 0.82 |
| Max drawdown (3Y) | -72.3% | -99.4% |
| Market cap | – | – |
| P/E (trailing) | 0.7 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CTRM | ICU |
|---|---|---|
| 2022 | -21.1% | -59.2% |
| 2023 | -62.1% | -89.2% |
| 2024 | -35.3% | -82.5% |
| 2025 | -24.7% | -87.6% |
| 2026 | +15.9% | +29.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CTRM and ICU good diversifiers for each other?
A fair diversifier. At 0.26, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between CTRM and ICU?
As of 2026-08-27, the correlation of weekly returns between CTRM and ICU is 0.26 over 3 years, 0.17 over 1 year and 0.21 over 5 years.
Is ICU a good diversifier for CTRM?
A fair diversifier. At 0.26, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.26 mean?
On the −1 to +1 scale, 0.26 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/ctrm-vs-icu.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ctrm-vs-icu/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CTRM correlations · ICU correlations
