CERS vs RMT: Correlation
How closely do Cerus Corporation (CERS) and Royce Micro-Cap Trust, Inc. (RMT) trade together? Their weekly returns over three years give a correlation of 0.55, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CERS and RMT?
Across a 3-year window, the weekly returns of CERS and RMT correlate at 0.55, moderate. The past 12 months show a weaker link (0.39) than the 3-year average (0.55). Stretching to 5 years gives 0.52, with an annualized covariance of 796.3 %².
In CERS's tracked universe of 10 assets, RMT sits right near the top at #3. The last year tells two different stories: CERS led by 59.2 percentage points, +107.6% for CERS against +48.4% for RMT. Note the risk asymmetry: CERS runs 3.5 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.
CERS vs RMT: side by side
| CERS (Cerus Corporation) | RMT (Royce Micro-Cap Trust, Inc.) | |
|---|---|---|
| 1-year return | +107.6% | +48.4% |
| 5-year return | -57.3% | +80.1% |
| Volatility (ann.) | 71.0% | 20.5% |
| Beta vs S&P 500 | 2.01 | 1.09 |
| Max drawdown (3Y) | -52.1% | -26.4% |
| Market cap | $0.5B | $0.8B |
| P/E (trailing) | – | 8.5 |
| Dividend yield | 0.00% | 5.57% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CERS | RMT |
|---|---|---|
| 2022 | -46.4% | -16.8% |
| 2023 | -40.8% | +15.8% |
| 2024 | -28.7% | +14.0% |
| 2025 | +33.8% | +16.1% |
| 2026 | +32.0% | +39.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CERS and RMT good diversifiers for each other?
Somewhat, no more. With 0.55 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between CERS and RMT?
Using weekly returns as of 2026-08-27: 0.55 over 3 years, with 0.39 over the last year and 0.52 over 5 years.
Is RMT a good diversifier for CERS?
Somewhat, no more. With 0.55 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.55 mean?
A reading of 0.55 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/cers-vs-rmt.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/cers-vs-rmt/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: CERS correlations · RMT correlations
