IRIX vs PULM: Correlation
IRIDEX Corporation (IRIX) and Pulmatrix, Inc. (PULM) show a moderate relationship: their 3-year correlation of weekly returns is 0.30.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IRIX and PULM?
Across a 3-year window, the weekly returns of IRIX and PULM correlate at 0.30, moderate. Little has changed lately, as the 1-year reading of 0.33 lands near the 3-year figure. Stretching to 5 years gives 0.25, with an annualized covariance of 2625.3 %².
By 3-year correlation, PULM places #4 of the 10 assets tracked against IRIX. Their recent paths diverged sharply: over the last 12 months IRIX outperformed by 23.5 percentage points (-45.2% for IRIX against -68.7% for PULM). Note the risk asymmetry: PULM runs 2.4 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.
IRIX vs PULM: side by side
| IRIX (IRIDEX Corporation) | PULM (Pulmatrix, Inc.) | |
|---|---|---|
| 1-year return | -45.2% | -68.7% |
| 5-year return | -90.8% | -90.6% |
| Volatility (ann.) | 60.9% | 144.8% |
| Beta vs S&P 500 | 0.50 | -0.18 |
| Max drawdown (3Y) | -79.9% | -88.1% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | IRIX | PULM |
|---|---|---|
| 2022 | -67.1% | -55.7% |
| 2023 | +39.8% | -52.1% |
| 2024 | -40.2% | +275.3% |
| 2025 | -32.1% | -68.1% |
| 2026 | -37.5% | -31.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IRIX and PULM good diversifiers for each other?
Reasonably. At 0.30, IRIX and PULM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between IRIX and PULM?
Using weekly returns as of 2026-08-27: 0.30 over 3 years, with 0.33 over the last year and 0.25 over 5 years.
Is PULM a good diversifier for IRIX?
Reasonably. At 0.30, IRIX and PULM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.30 mean?
A reading of 0.30 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/irix-vs-pulm.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/irix-vs-pulm/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: IRIX correlations · PULM correlations
