MBRX vs MPAA: Correlation
Measured on weekly returns over the past three years, Moleculin Biotech, Inc. (MBRX) and Motorcar Parts of America, Inc. (MPAA) carry a correlation of 0.38, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MBRX and MPAA?
Across a 3-year window, the weekly returns of MBRX and MPAA correlate at 0.38, moderate. The link has loosened recently: the 1-year correlation (0.07) runs below the 3-year figure (0.38). Stretching to 5 years gives 0.29, with an annualized covariance of 4223.6 %².
Within MBRX's tracked universe of 13 assets, MPAA comes in at #4 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months MPAA outperformed by 71.9 percentage points (-95.5% for MBRX against -23.6% for MPAA). Risk is not evenly split, since MBRX carries 2.3 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.
MBRX vs MPAA: side by side
| MBRX (Moleculin Biotech, Inc.) | MPAA (Motorcar Parts of America, Inc.) | |
|---|---|---|
| 1-year return | -95.5% | -23.6% |
| 5-year return | -99.9% | -42.5% |
| Volatility (ann.) | 160.4% | 69.6% |
| Beta vs S&P 500 | 1.10 | 1.42 |
| Max drawdown (3Y) | -99.9% | -53.3% |
| Market cap | – | $0.2B |
| P/E (trailing) | 0.0 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | MBRX | MPAA |
|---|---|---|
| 2022 | -43.0% | -30.5% |
| 2023 | -19.1% | -21.2% |
| 2024 | -86.8% | -18.6% |
| 2025 | -92.2% | +62.4% |
| 2026 | -79.2% | -7.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MBRX and MPAA good diversifiers for each other?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between MBRX and MPAA?
Using weekly returns as of 2026-08-27: 0.38 over 3 years, with 0.07 over the last year and 0.29 over 5 years.
Is MPAA a good diversifier for MBRX?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.38 mean?
On the −1 to +1 scale, 0.38 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/mbrx-vs-mpaa.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/mbrx-vs-mpaa/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MBRX correlations · MPAA correlations
