PSA vs SER: Correlation
How closely do Public Storage (PSA) and Serina Therapeutics, Inc. (SER) trade together? Their weekly returns over three years give a correlation of -0.17, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PSA and SER?
Across a 3-year window, the weekly returns of PSA and SER correlate at -0.17, negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.16) sits close to the 3-year figure. Stretching to 5 years gives -0.05, with an annualized covariance of -394.2 %².
Out of 33 assets tracked against PSA, SER lands near the bottom at #29. The last year tells two different stories: PSA led by 60.8 percentage points, +11.3% for PSA against -49.5% for SER. One caveat on sizing: SER is 4.3 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
PSA vs SER: side by side
| PSA (Public Storage) | SER (Serina Therapeutics, Inc.) | |
|---|---|---|
| 1-year return | +11.3% | -49.5% |
| 5-year return | +20.9% | -93.1% |
| Volatility (ann.) | 23.0% | 98.4% |
| Beta vs S&P 500 | 0.59 | -0.30 |
| Max drawdown (3Y) | -25.6% | -95.5% |
| Market cap | $58.1B | $0.1B |
| P/E (trailing) | 30.3 | – |
| Dividend yield | 3.78% | 0.00% |
| Sector / category | Real Estate | US Listed |
Year-by-year returns
| Year | PSA | SER |
|---|---|---|
| 2022 | -20.2% | -49.4% |
| 2023 | +13.6% | -30.3% |
| 2024 | +2.1% | -63.6% |
| 2025 | -9.7% | -61.8% |
| 2026 | +22.3% | +31.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PSA and SER good diversifiers for each other?
Yes. With a correlation of -0.17, PSA and SER have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between PSA and SER?
As of 2026-08-27, the correlation of weekly returns between PSA and SER is -0.17 over 3 years, -0.16 over 1 year and -0.05 over 5 years.
Is SER a good diversifier for PSA?
Yes. With a correlation of -0.17, PSA and SER have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.17 mean?
On the −1 to +1 scale, -0.17 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/psa-vs-ser.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/psa-vs-ser/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: PSA correlations · SER correlations
