FF vs PULM: Correlation
Measured on weekly returns over the past three years, FutureFuel Corp. (FF) and Pulmatrix, Inc. (PULM) carry a correlation of -0.25, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are FF and PULM?
On 3 years of weekly data the FF/PULM correlation comes out at -0.25, negative, meaning they tend to move in opposite directions. Little has changed lately, as the 1-year reading of -0.32 lands near the 3-year figure. The 5-year figure is -0.17, and annualized covariance runs at -1789.2 %².
Among the 12 assets we track against FF, PULM sits near the bottom by co-movement, at rank #12. Their recent paths diverged sharply: over the last 12 months FF outperformed by 107.1 percentage points (+38.4% for FF against -68.7% for PULM). Note the risk asymmetry: PULM runs 3.0 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.
FF vs PULM: side by side
| FF (FutureFuel Corp.) | PULM (Pulmatrix, Inc.) | |
|---|---|---|
| 1-year return | +38.4% | -68.7% |
| 5-year return | +11.5% | -90.6% |
| Volatility (ann.) | 48.8% | 144.8% |
| Beta vs S&P 500 | 0.88 | -0.18 |
| Max drawdown (3Y) | -47.9% | -88.1% |
| Market cap | $0.2B | – |
| P/E (trailing) | – | – |
| Dividend yield | 3.58% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | FF | PULM |
|---|---|---|
| 2022 | +9.9% | -55.7% |
| 2023 | -22.8% | -52.1% |
| 2024 | +31.0% | +275.3% |
| 2025 | -35.8% | -68.1% |
| 2026 | +65.4% | -31.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are FF and PULM good diversifiers for each other?
Yes: at -0.25, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between FF and PULM?
As of 2026-08-27, the correlation of weekly returns between FF and PULM is -0.25 over 3 years, -0.32 over 1 year and -0.17 over 5 years.
Is PULM a good diversifier for FF?
Yes: at -0.25, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.25 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/ff-vs-pulm.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ff-vs-pulm/)
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Related comparisons
Hubs: FF correlations · PULM correlations
