BDN vs PDM: Correlation
Measured on weekly returns over the past three years, Brandywine Realty Trust (BDN) and Piedmont Realty Trust, Inc. (PDM) carry a correlation of 0.75, a strong link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BDN and PDM?
Across a 3-year window, the weekly returns of BDN and PDM correlate at 0.75, strong. Little has changed lately, as the 1-year reading of 0.65 lands near the 3-year figure. Stretching to 5 years gives 0.80, with an annualized covariance of 1066.5 %².
PDM is one of the assets that tracks BDN most closely: it ranks #1 out of the 13 assets we track against BDN. Their recent paths diverged sharply: over the last 12 months PDM outperformed by 34.3 percentage points (-18.3% for BDN against +16.0% for PDM).
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.
BDN vs PDM: side by side
| BDN (Brandywine Realty Trust) | PDM (Piedmont Realty Trust, Inc.) | |
|---|---|---|
| 1-year return | -18.3% | +16.0% |
| 5-year return | -61.3% | -29.9% |
| Volatility (ann.) | 40.3% | 35.3% |
| Beta vs S&P 500 | 1.01 | 0.95 |
| Max drawdown (3Y) | -56.3% | -46.4% |
| Market cap | $0.5B | $1.2B |
| P/E (trailing) | – | – |
| Dividend yield | 9.94% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BDN | PDM |
|---|---|---|
| 2022 | -50.7% | -46.8% |
| 2023 | +1.7% | -14.8% |
| 2024 | +17.1% | +37.2% |
| 2025 | -41.3% | -7.3% |
| 2026 | +15.3% | +16.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BDN and PDM good diversifiers for each other?
To a limited degree. At 0.75 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 BDN and PDM?
Using weekly returns as of 2026-08-27: 0.75 over 3 years, with 0.65 over the last year and 0.80 over 5 years.
Is PDM a good diversifier for BDN?
To a limited degree. At 0.75 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 0.75 mean?
A reading of 0.75 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/bdn-vs-pdm.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bdn-vs-pdm/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BDN correlations · PDM correlations
