GAM vs IDXX: Correlation
Measured on weekly returns over the past three years, General American Investors, Inc. (GAM) and Idexx Laboratories (IDXX) carry a correlation of 0.47, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GAM and IDXX?
Over the past 3 years, GAM and IDXX moved with a correlation of 0.47, which is moderate. The past 12 months show a weaker link (0.25) than the 3-year average (0.47). Over 5 years the correlation is 0.59, and the annualized covariance of weekly returns is 199.0 %².
Among the 14 assets we track against GAM, IDXX ranks #9 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months GAM outperformed by 41.0 percentage points (+26.1% for GAM against -14.9% for IDXX). Note the risk asymmetry: IDXX runs 2.3 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.
GAM vs IDXX: side by side
| GAM (General American Investors, Inc.) | IDXX (Idexx Laboratories) | |
|---|---|---|
| 1-year return | +26.1% | -14.9% |
| 5-year return | +118.0% | -20.7% |
| Volatility (ann.) | 13.6% | 30.9% |
| Beta vs S&P 500 | 0.81 | 1.01 |
| Max drawdown (3Y) | -14.9% | -37.4% |
| Market cap | $1.6B | $42.9B |
| P/E (trailing) | 4.2 | 38.9 |
| Dividend yield | 9.47% | 0.00% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | GAM | IDXX |
|---|---|---|
| 2022 | -14.8% | -38.0% |
| 2023 | +26.8% | +36.1% |
| 2024 | +29.5% | -25.5% |
| 2025 | +28.6% | +63.6% |
| 2026 | +15.1% | -19.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are GAM and IDXX good diversifiers for each other?
A fair diversifier. At 0.47, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between GAM and IDXX?
Using weekly returns as of 2026-08-27: 0.47 over 3 years, with 0.25 over the last year and 0.59 over 5 years.
Is IDXX a good diversifier for GAM?
A fair diversifier. At 0.47, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.47 mean?
A reading of 0.47 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/gam-vs-idxx.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/gam-vs-idxx/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: GAM correlations · IDXX correlations
