KROS vs MBBC: Correlation
How closely do Keros Therapeutics, Inc. (KROS) and Marathon Bancorp, Inc. (MBBC) trade together? Their weekly returns over three years give a correlation of -0.24, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are KROS and MBBC?
Across a 3-year window, the weekly returns of KROS and MBBC correlate at -0.24, negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (0.04) than the 3-year average (-0.24). Stretching to 5 years gives -0.15, with an annualized covariance of -524.5 %².
Within KROS's tracked universe of 17 assets, MBBC comes in at #11 by 3-year correlation. The last year tells two different stories: MBBC led by 75.9 percentage points, -27.6% for KROS against +48.3% for MBBC. Note the risk asymmetry: KROS runs 2.2 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
KROS vs MBBC: side by side
| KROS (Keros Therapeutics, Inc.) | MBBC (Marathon Bancorp, Inc.) | |
|---|---|---|
| 1-year return | -27.6% | +48.3% |
| 5-year return | -67.0% | +103.0% |
| Volatility (ann.) | 69.9% | 31.3% |
| Beta vs S&P 500 | 0.98 | -0.07 |
| Max drawdown (3Y) | -86.5% | -28.3% |
| Market cap | $0.2B | – |
| P/E (trailing) | – | 36.7 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | KROS | MBBC |
|---|---|---|
| 2022 | -17.9% | +4.7% |
| 2023 | -17.2% | -17.0% |
| 2024 | -60.2% | +49.9% |
| 2025 | +28.6% | +19.2% |
| 2026 | -44.8% | +26.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are KROS and MBBC good diversifiers for each other?
Yes. With a correlation of -0.24, KROS and MBBC have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between KROS and MBBC?
Using weekly returns as of 2026-08-27: -0.24 over 3 years, with 0.04 over the last year and -0.15 over 5 years.
Is MBBC a good diversifier for KROS?
Yes. With a correlation of -0.24, KROS and MBBC have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.24 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/kros-vs-mbbc.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/kros-vs-mbbc/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: KROS correlations · MBBC correlations
