BDX vs DUOL: Correlation
Becton Dickinson (BDX) and Duolingo, Inc. (DUOL) show a negative relationship: their 3-year correlation of weekly returns is -0.19.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BDX and DUOL?
Across a 3-year window, the weekly returns of BDX and DUOL correlate at -0.19, negative, meaning they tend to move in opposite directions. Lately the two have moved closer together, with the 1-year correlation at -0.01 versus -0.19 over 3 years. Stretching to 5 years gives -0.08, with an annualized covariance of -286.8 %².
Among the 28 assets we track against BDX, DUOL sits near the bottom by co-movement, at rank #24. Correlation aside, the last 12 months split them widely, with BDX ahead by 80.6 points (+25.5% versus -55.1%). One caveat on sizing: DUOL is 2.6 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.
BDX vs DUOL: side by side
| BDX (Becton Dickinson) | DUOL (Duolingo, Inc.) | |
|---|---|---|
| 1-year return | +25.5% | -55.1% |
| 5-year return | +6.8% | +11.0% |
| Volatility (ann.) | 24.0% | 62.1% |
| Beta vs S&P 500 | 0.33 | 1.55 |
| Max drawdown (3Y) | -39.6% | -83.3% |
| Market cap | $51.2B | $6.7B |
| P/E (trailing) | 32.9 | 16.6 |
| Dividend yield | 2.20% | 0.00% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | BDX | DUOL |
|---|---|---|
| 2022 | +5.1% | -33.0% |
| 2023 | -2.7% | +218.9% |
| 2024 | -5.4% | +42.9% |
| 2025 | -12.6% | -45.9% |
| 2026 | +25.0% | -18.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BDX and DUOL good diversifiers for each other?
Yes: at -0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between BDX and DUOL?
The BDX/DUOL correlation stands at -0.19 on a 3-year window (1 year: -0.01, 5 years: -0.08), computed from weekly returns as of 2026-08-27.
Is DUOL a good diversifier for BDX?
Yes: at -0.19, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.19 mean?
A reading of -0.19 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/bdx-vs-duol.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/bdx-vs-duol/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BDX correlations · DUOL correlations
