BCDA vs QQQ: Correlation
How closely do BioCardia, Inc. (BCDA) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.18, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BCDA and QQQ?
Across a 3-year window, the weekly returns of BCDA and QQQ correlate at 0.18, weak. Lately the two have drifted apart, with the 1-year correlation at -0.08 versus 0.18 over 3 years. Stretching to 5 years gives 0.15, with an annualized covariance of 364.7 %².
Out of 13 assets tracked against BCDA, QQQ lands near the bottom at #9. The last year tells two different stories: QQQ led by 66.0 percentage points, -39.7% for BCDA against +26.3% for QQQ. Risk is not evenly split, since BCDA carries 5.2 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.
BCDA vs QQQ: side by side
| BCDA (BioCardia, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | -39.7% | +26.3% |
| 5-year return | -97.4% | +95.4% |
| Volatility (ann.) | 102.2% | 19.6% |
| Beta vs S&P 500 | 1.62 | 1.28 |
| Max drawdown (3Y) | -95.2% | -22.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.44% |
| Expense ratio | – | 0.18% |
| Assets under management | – | $452.8B |
| Sector / category | US Listed | ETF · US Growth & Tech |
QQQ is a Large Growth fund from Invesco: $452.8B under management, 104 holdings, a 0.18% expense ratio, a 0.44% trailing dividend yield.
Year-by-year returns
| Year | BCDA | QQQ |
|---|---|---|
| 2022 | +7.7% | -32.6% |
| 2023 | -68.4% | +54.9% |
| 2024 | -78.0% | +25.6% |
| 2025 | -42.7% | +20.8% |
| 2026 | -6.4% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BCDA and QQQ good diversifiers for each other?
Yes. With a correlation of 0.18, BCDA and QQQ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between BCDA and QQQ?
The BCDA/QQQ correlation stands at 0.18 on a 3-year window (1 year: -0.08, 5 years: 0.15), computed from weekly returns as of 2026-08-27.
Is QQQ a good diversifier for BCDA?
Yes. With a correlation of 0.18, BCDA and QQQ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of 0.18 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/bcda-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bcda-vs-qqq/)
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Related comparisons
Hubs: BCDA correlations · QQQ correlations
