IRDM vs STM: Correlation
Measured on weekly returns over the past three years, Iridium Communications Inc (IRDM) and STMicroelectronics N.V. (STM) carry a correlation of 0.37, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IRDM and STM?
On 3 years of weekly data the IRDM/STM correlation comes out at 0.37, moderate. Little has changed lately, as the 1-year reading of 0.39 lands near the 3-year figure. The 5-year figure is 0.33, and annualized covariance runs at 852.7 %².
Among the 12 assets we track against IRDM, STM ranks #5 by 3-year correlation. Twelve-month performance is nearly a tie, at +95.4% for IRDM and +91.0% for STM.
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.
IRDM vs STM: side by side
| IRDM (Iridium Communications Inc) | STM (STMicroelectronics N.V.) | |
|---|---|---|
| 1-year return | +95.4% | +91.0% |
| 5-year return | +8.5% | +19.4% |
| Volatility (ann.) | 49.3% | 46.5% |
| Beta vs S&P 500 | 0.85 | 1.62 |
| Max drawdown (3Y) | -67.5% | -64.6% |
| Market cap | $5.0B | $45.8B |
| P/E (trailing) | 54.1 | – |
| Dividend yield | 1.27% | 0.72% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | IRDM | STM |
|---|---|---|
| 2022 | +24.5% | -26.8% |
| 2023 | -19.1% | +41.7% |
| 2024 | -28.1% | -49.7% |
| 2025 | -38.5% | +5.3% |
| 2026 | +176.6% | +98.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IRDM and STM good diversifiers for each other?
Reasonably. At 0.37, IRDM and STM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between IRDM and STM?
The IRDM/STM correlation stands at 0.37 on a 3-year window (1 year: 0.39, 5 years: 0.33), computed from weekly returns as of 2026-08-27.
Is STM a good diversifier for IRDM?
Reasonably. At 0.37, IRDM and STM keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.37 mean?
On the −1 to +1 scale, 0.37 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/irdm-vs-stm.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/irdm-vs-stm/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: IRDM correlations · STM correlations
