RMT vs STRO: Correlation
How closely do Royce Micro-Cap Trust, Inc. (RMT) and Sutro Biopharma, Inc. (STRO) trade together? Their weekly returns over three years give a correlation of 0.51, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RMT and STRO?
Over the past 3 years, RMT and STRO moved with a correlation of 0.51, which is moderate. The past 12 months show a weaker link (0.39) than the 3-year average (0.51). Over 5 years the correlation is 0.43, and the annualized covariance of weekly returns is 1180.1 %².
Within RMT's tracked universe of 136 assets, STRO comes in at #74 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months STRO outperformed by 88.4 percentage points (+48.4% for RMT against +136.8% for STRO). Risk is not evenly split, since STRO carries 5.5 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.
RMT vs STRO: side by side
| RMT (Royce Micro-Cap Trust, Inc.) | STRO (Sutro Biopharma, Inc.) | |
|---|---|---|
| 1-year return | +48.4% | +136.8% |
| 5-year return | +80.1% | -90.2% |
| Volatility (ann.) | 20.5% | 112.5% |
| Beta vs S&P 500 | 1.09 | 3.52 |
| Max drawdown (3Y) | -26.4% | -90.8% |
| Market cap | $0.8B | $0.4B |
| P/E (trailing) | 8.5 | – |
| Dividend yield | 5.57% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | RMT | STRO |
|---|---|---|
| 2022 | -16.8% | -45.7% |
| 2023 | +15.8% | -46.9% |
| 2024 | +14.0% | -57.1% |
| 2025 | +16.1% | -37.1% |
| 2026 | +39.6% | +84.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RMT and STRO good diversifiers for each other?
Somewhat, no more. With 0.51 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between RMT and STRO?
The RMT/STRO correlation stands at 0.51 on a 3-year window (1 year: 0.39, 5 years: 0.43), computed from weekly returns as of 2026-08-27.
Is STRO a good diversifier for RMT?
Somewhat, no more. With 0.51 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.51 mean?
On the −1 to +1 scale, 0.51 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/rmt-vs-stro.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/rmt-vs-stro/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: RMT correlations · STRO correlations
