BDC vs QQQ: Correlation
How closely do Belden Inc (BDC) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.38, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BDC and QQQ?
Across a 3-year window, the weekly returns of BDC and QQQ correlate at 0.38, moderate. The past 12 months show a weaker link (0.23) than the 3-year average (0.38). Stretching to 5 years gives 0.45, with an annualized covariance of 291.6 %².
QQQ is close to the least connected end of BDC's tracked universe, ranking #10 of 13. The last year tells two different stories: QQQ led by 35.9 percentage points, -9.6% for BDC against +26.3% for QQQ. Risk is not evenly split, since BDC carries 2.0 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.
BDC vs QQQ: side by side
| BDC (Belden Inc) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | -9.6% | +26.3% |
| 5-year return | +113.6% | +95.4% |
| Volatility (ann.) | 39.2% | 19.6% |
| Beta vs S&P 500 | 1.17 | 1.28 |
| Max drawdown (3Y) | -35.8% | -22.8% |
| Market cap | $4.7B | – |
| P/E (trailing) | 19.5 | – |
| Dividend yield | 0.17% | 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 | BDC | QQQ |
|---|---|---|
| 2022 | +9.7% | -32.6% |
| 2023 | +7.7% | +54.9% |
| 2024 | +46.1% | +25.6% |
| 2025 | +3.7% | +20.8% |
| 2026 | +3.0% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BDC and QQQ good diversifiers for each other?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BDC and QQQ?
Using weekly returns as of 2026-08-27: 0.38 over 3 years, with 0.23 over the last year and 0.45 over 5 years.
Is QQQ a good diversifier for BDC?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.38 mean?
On the −1 to +1 scale, 0.38 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/bdc-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bdc-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BDC correlations · QQQ correlations
