CTRM vs OPK: Correlation
How closely do Castor Maritime Inc. (CTRM) and Opko Health, Inc. (OPK) trade together? Their weekly returns over three years give a correlation of -0.21, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CTRM and OPK?
Over the past 3 years, CTRM and OPK moved with a correlation of -0.21, which is negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (0.15) runs above the 3-year figure (-0.21). Over 5 years the correlation is -0.04, and the annualized covariance of weekly returns is -529.5 %².
Out of 12 assets tracked against CTRM, OPK lands near the bottom at #12. On 12-month performance CTRM holds a 6.5-point edge, +12.1% against +5.6%.
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 OPK: side by side
| CTRM (Castor Maritime Inc.) | OPK (Opko Health, Inc.) | |
|---|---|---|
| 1-year return | +12.1% | +5.6% |
| 5-year return | -89.2% | -60.9% |
| Volatility (ann.) | 51.7% | 48.2% |
| Beta vs S&P 500 | 0.35 | 0.84 |
| Max drawdown (3Y) | -72.3% | -53.2% |
| Market cap | – | $1.1B |
| P/E (trailing) | 0.7 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CTRM | OPK |
|---|---|---|
| 2022 | -21.1% | -74.0% |
| 2023 | -62.1% | +20.8% |
| 2024 | -35.3% | -2.6% |
| 2025 | -24.7% | -14.3% |
| 2026 | +15.9% | +19.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CTRM and OPK good diversifiers for each other?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
FAQ
What is the correlation between CTRM and OPK?
As of 2026-08-27, the correlation of weekly returns between CTRM and OPK is -0.21 over 3 years, 0.15 over 1 year and -0.04 over 5 years.
Is OPK a good diversifier for CTRM?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
What does a correlation of -0.21 mean?
A reading of -0.21 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/ctrm-vs-opk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ctrm-vs-opk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CTRM correlations · OPK correlations
