ALDX vs PFL: Correlation
How closely do Aldeyra Therapeutics, Inc. (ALDX) and PIMCO Income Strategy Fund Shares of Beneficial Interest (PFL) trade together? Their weekly returns over three years give a correlation of 0.58, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ALDX and PFL?
On 3 years of weekly data the ALDX/PFL correlation comes out at 0.58, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.43 versus 0.58 over 3 years. The 5-year figure is 0.42, and annualized covariance runs at 742.4 %².
PFL is one of the assets that tracks ALDX most closely: it ranks #1 out of the 13 assets we track against ALDX. Their recent paths diverged sharply: over the last 12 months PFL outperformed by 74.8 percentage points (-73.7% for ALDX against +1.1% for PFL). Risk is not evenly split, since ALDX carries 9.0 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.
ALDX vs PFL: side by side
| ALDX (Aldeyra Therapeutics, Inc.) | PFL (PIMCO Income Strategy Fund Shares of Beneficial Interest) | |
|---|---|---|
| 1-year return | -73.7% | +1.1% |
| 5-year return | -83.1% | +1.9% |
| Volatility (ann.) | 107.4% | 12.0% |
| Beta vs S&P 500 | 3.13 | 0.39 |
| Max drawdown (3Y) | -83.8% | -11.1% |
| Market cap | $0.1B | – |
| P/E (trailing) | – | 9.6 |
| Dividend yield | 0.00% | 12.86% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ALDX | PFL |
|---|---|---|
| 2022 | +74.0% | -18.0% |
| 2023 | -49.6% | +17.2% |
| 2024 | +42.2% | +11.4% |
| 2025 | +3.8% | +13.0% |
| 2026 | -70.3% | -2.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ALDX and PFL good diversifiers for each other?
To a limited degree. At 0.58 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between ALDX and PFL?
The ALDX/PFL correlation stands at 0.58 on a 3-year window (1 year: 0.43, 5 years: 0.42), computed from weekly returns as of 2026-08-27.
Is PFL a good diversifier for ALDX?
To a limited degree. At 0.58 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.58 mean?
On the −1 to +1 scale, 0.58 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/aldx-vs-pfl.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/aldx-vs-pfl/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ALDX correlations · PFL correlations
