HOWL vs ZSTK: Correlation
How closely do Werewolf Therapeutics, Inc. (HOWL) and ZeroStack Corp. (ZSTK) trade together? Their weekly returns over three years give a correlation of 0.46, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are HOWL and ZSTK?
Across a 3-year window, the weekly returns of HOWL and ZSTK correlate at 0.46, moderate. The link has tightened recently: the 1-year correlation (0.63) runs above the 3-year figure (0.46). Stretching to 5 years gives 0.33, with an annualized covariance of 8734.8 %².
Within HOWL's tracked universe of 10 assets, ZSTK comes in at #5 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months HOWL outperformed by 46.4 percentage points (-27.0% for HOWL against -73.4% for ZSTK).
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.
HOWL vs ZSTK: side by side
| HOWL (Werewolf Therapeutics, Inc.) | ZSTK (ZeroStack Corp.) | |
|---|---|---|
| 1-year return | -27.0% | -73.4% |
| 5-year return | -94.4% | -99.9% |
| Volatility (ann.) | 124.1% | 153.8% |
| Beta vs S&P 500 | 1.39 | 2.10 |
| Max drawdown (3Y) | -96.1% | -99.1% |
| Market cap | – | $0.1B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | HOWL | ZSTK |
|---|---|---|
| 2022 | -82.8% | -87.2% |
| 2023 | +88.3% | -70.4% |
| 2024 | -61.7% | -23.7% |
| 2025 | -57.2% | -84.4% |
| 2026 | +53.1% | -6.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are HOWL and ZSTK good diversifiers for each other?
A fair diversifier. At 0.46, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between HOWL and ZSTK?
As of 2026-08-27, the correlation of weekly returns between HOWL and ZSTK is 0.46 over 3 years, 0.63 over 1 year and 0.33 over 5 years.
Is ZSTK a good diversifier for HOWL?
A fair diversifier. At 0.46, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.46 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
$ curl https://www.pairbook.io/api/v1/pairs/howl-vs-zstk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/howl-vs-zstk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: HOWL correlations · ZSTK correlations
