PLNT vs RLYB: Correlation
How closely do Planet Fitness, Inc. (PLNT) and Rallybio Corporation (RLYB) trade together? Their weekly returns over three years give a correlation of -0.26, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PLNT and RLYB?
On 3 years of weekly data the PLNT/RLYB correlation comes out at -0.26, negative, meaning they tend to move in opposite directions. The link has loosened recently: the 1-year correlation (-0.52) runs below the 3-year figure (-0.26). The 5-year figure is -0.11, and annualized covariance runs at -1013.1 %².
Within PLNT's tracked universe of 24 assets, RLYB comes in at #17 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months RLYB outperformed by 306.2 percentage points (-51.1% for PLNT against +255.1% for RLYB). Risk is not evenly split, since RLYB carries 2.5 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.
PLNT vs RLYB: side by side
| PLNT (Planet Fitness, Inc.) | RLYB (Rallybio Corporation) | |
|---|---|---|
| 1-year return | -51.1% | +255.1% |
| 5-year return | -36.6% | -83.7% |
| Volatility (ann.) | 39.0% | 99.0% |
| Beta vs S&P 500 | 0.42 | 0.78 |
| Max drawdown (3Y) | -61.2% | -95.5% |
| Market cap | $3.9B | $0.1B |
| P/E (trailing) | 17.6 | 2.1 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | PLNT | RLYB |
|---|---|---|
| 2022 | -13.0% | -31.1% |
| 2023 | -7.4% | -63.6% |
| 2024 | +35.4% | -59.8% |
| 2025 | +9.7% | -28.5% |
| 2026 | -52.3% | +205.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PLNT and RLYB good diversifiers for each other?
Yes. With a correlation of -0.26, PLNT and RLYB have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between PLNT and RLYB?
The PLNT/RLYB correlation stands at -0.26 on a 3-year window (1 year: -0.52, 5 years: -0.11), computed from weekly returns as of 2026-08-27.
Is RLYB a good diversifier for PLNT?
Yes. With a correlation of -0.26, PLNT and RLYB have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.26 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/plnt-vs-rlyb.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/plnt-vs-rlyb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PLNT correlations · RLYB correlations
