BMEZ vs PTCT: Correlation
How closely do BlackRock Health Sciences Term Trust (BMEZ) and PTC Therapeutics, Inc. (PTCT) trade together? Their weekly returns over three years give a correlation of 0.45, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BMEZ and PTCT?
Over the past 3 years, BMEZ and PTCT moved with a correlation of 0.45, which is moderate. The relationship has been stable: the 1-year correlation (0.37) sits close to the 3-year figure. Over 5 years the correlation is 0.43, and the annualized covariance of weekly returns is 390.5 %².
Among the 23 assets we track against BMEZ, PTCT ranks #11 by 3-year correlation. The trailing year gives PTCT the advantage: +31.4% versus +44.3%, a 12.9-point spread. Risk is not evenly split, since PTCT carries 3.2 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.
BMEZ vs PTCT: side by side
| BMEZ (BlackRock Health Sciences Term Trust) | PTCT (PTC Therapeutics, Inc.) | |
|---|---|---|
| 1-year return | +31.4% | +44.3% |
| 5-year return | +0.9% | +70.4% |
| Volatility (ann.) | 16.5% | 52.5% |
| Beta vs S&P 500 | 0.63 | 1.25 |
| Max drawdown (3Y) | -18.3% | -56.8% |
| Market cap | $1.1B | $6.0B |
| P/E (trailing) | 6.7 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BMEZ | PTCT |
|---|---|---|
| 2022 | -32.7% | -4.2% |
| 2023 | +5.1% | -27.8% |
| 2024 | +9.5% | +63.8% |
| 2025 | +18.7% | +68.3% |
| 2026 | +20.6% | -5.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BMEZ and PTCT good diversifiers for each other?
A fair diversifier. At 0.45, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BMEZ and PTCT?
As of 2026-08-27, the correlation of weekly returns between BMEZ and PTCT is 0.45 over 3 years, 0.37 over 1 year and 0.43 over 5 years.
Is PTCT a good diversifier for BMEZ?
A fair diversifier. At 0.45, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.45 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
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[](https://www.pairbook.io/pair/bmez-vs-ptct/)
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Related comparisons
Hubs: BMEZ correlations · PTCT correlations
