ISPC vs PACS: Correlation
Measured on weekly returns over the past three years, iSpecimen Inc. (ISPC) and PACS Group, Inc. (PACS) carry a correlation of -0.23, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ISPC and PACS?
Over the past 3 years, ISPC and PACS moved with a correlation of -0.23, which is negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.27) sits close to the 3-year figure. Over 5 years the correlation is n/a, and the annualized covariance of weekly returns is -3540.9 %².
Out of 15 assets tracked against ISPC, PACS lands near the bottom at #14. Correlation aside, the last 12 months split them widely, with PACS ahead by 367.6 points (-94.6% versus +273.0%).
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.
ISPC vs PACS: side by side
| ISPC (iSpecimen Inc.) | PACS (PACS Group, Inc.) | |
|---|---|---|
| 1-year return | -94.6% | +273.0% |
| 5-year return | -100.0% | n/a |
| Volatility (ann.) | 121.8% | 120.5% |
| Beta vs S&P 500 | 0.67 | 0.06 |
| Max drawdown (3Y) | -99.8% | -82.0% |
| Market cap | – | $7.0B |
| P/E (trailing) | – | 25.9 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ISPC | PACS |
|---|---|---|
| 2022 | -82.4% | – |
| 2023 | -63.6% | – |
| 2024 | -73.5% | – |
| 2025 | -90.2% | +192.8% |
| 2026 | -84.6% | +15.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ISPC and PACS good diversifiers for each other?
Yes: at -0.23, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between ISPC and PACS?
Using weekly returns as of 2026-08-27: -0.23 over 3 years, with -0.27 over the last year and n/a over 5 years.
Is PACS a good diversifier for ISPC?
Yes: at -0.23, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.23 mean?
On the −1 to +1 scale, -0.23 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/ispc-vs-pacs.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ispc-vs-pacs/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ISPC correlations · PACS correlations
