RMTI vs XBI: Correlation
Measured on weekly returns over the past three years, Rockwell Medical, Inc. (RMTI) and SPDR S&P Biotech ETF (XBI) carry a correlation of 0.42, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RMTI and XBI?
Across a 3-year window, the weekly returns of RMTI and XBI correlate at 0.42, moderate. The link has loosened recently: the 1-year correlation (0.13) runs below the 3-year figure (0.42). Stretching to 5 years gives 0.34, with an annualized covariance of 925.5 %².
In RMTI's tracked universe of 11 assets, XBI sits right near the top at #2. Their recent paths diverged sharply: over the last 12 months XBI outperformed by 134.5 percentage points (-47.3% for RMTI against +87.2% for XBI). Risk is not evenly split, since RMTI carries 2.9 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.
RMTI vs XBI: side by side
| RMTI (Rockwell Medical, Inc.) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | -47.3% | +87.2% |
| 5-year return | -89.3% | +28.6% |
| Volatility (ann.) | 79.9% | 27.7% |
| Beta vs S&P 500 | 1.63 | 1.09 |
| Max drawdown (3Y) | -88.8% | -33.0% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | RMTI | XBI |
|---|---|---|
| 2022 | -77.6% | -25.9% |
| 2023 | +87.1% | +7.6% |
| 2024 | +7.9% | +1.0% |
| 2025 | -59.3% | +35.9% |
| 2026 | -6.6% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RMTI and XBI good diversifiers for each other?
A fair diversifier. At 0.42, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between RMTI and XBI?
Using weekly returns as of 2026-08-27: 0.42 over 3 years, with 0.13 over the last year and 0.34 over 5 years.
Is XBI a good diversifier for RMTI?
A fair diversifier. At 0.42, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.42 mean?
A reading of 0.42 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/rmti-vs-xbi.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/rmti-vs-xbi/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: RMTI correlations · XBI correlations
