GBX vs SER: Correlation
Greenbrier Companies, Inc. (The) (GBX) and Serina Therapeutics, Inc. (SER) show a negative relationship: their 3-year correlation of weekly returns is -0.24.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GBX and SER?
Across a 3-year window, the weekly returns of GBX and SER correlate at -0.24, negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.29) sits close to the 3-year figure. Stretching to 5 years gives -0.04, with an annualized covariance of -863.0 %².
Among the 11 assets we track against GBX, SER sits near the bottom by co-movement, at rank #8. Correlation aside, the last 12 months split them widely, with GBX ahead by 50.0 points (+0.5% versus -49.5%). Risk is not evenly split, since SER carries 2.7 times the volatility of the other side.
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.
GBX vs SER: side by side
| GBX (Greenbrier Companies, Inc. (The)) | SER (Serina Therapeutics, Inc.) | |
|---|---|---|
| 1-year return | +0.5% | -49.5% |
| 5-year return | +19.2% | -93.1% |
| Volatility (ann.) | 36.2% | 98.4% |
| Beta vs S&P 500 | 0.71 | -0.30 |
| Max drawdown (3Y) | -43.7% | -95.5% |
| Market cap | $1.4B | $0.1B |
| P/E (trailing) | 13.6 | – |
| Dividend yield | 2.81% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | GBX | SER |
|---|---|---|
| 2022 | -24.8% | -49.4% |
| 2023 | +36.3% | -30.3% |
| 2024 | +41.3% | -63.6% |
| 2025 | -21.3% | -61.8% |
| 2026 | +0.7% | +31.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are GBX and SER good diversifiers for each other?
Yes: at -0.24, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between GBX and SER?
Using weekly returns as of 2026-08-27: -0.24 over 3 years, with -0.29 over the last year and -0.04 over 5 years.
Is SER a good diversifier for GBX?
Yes: at -0.24, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.24 mean?
On the −1 to +1 scale, -0.24 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.
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Related comparisons
Hubs: GBX correlations · SER correlations
