GCBC vs QQQ: Correlation
Measured on weekly returns over the past three years, Greene County Bancorp, Inc. (GCBC) and Invesco QQQ Trust (QQQ) carry a correlation of 0.18, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GCBC and QQQ?
Across a 3-year window, the weekly returns of GCBC and QQQ correlate at 0.18, weak. The link has loosened recently: the 1-year correlation (-0.14) runs below the 3-year figure (0.18). Stretching to 5 years gives 0.15, with an annualized covariance of 141.5 %².
QQQ is close to the least connected end of GCBC's tracked universe, ranking #7 of 10. Correlation aside, the last 12 months split them widely, with GCBC ahead by 20.8 points (+47.1% versus +26.3%). Risk is not evenly split, since GCBC carries 2.1 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.
GCBC vs QQQ: side by side
| GCBC (Greene County Bancorp, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | +47.1% | +26.3% |
| 5-year return | +139.6% | +95.4% |
| Volatility (ann.) | 40.5% | 19.6% |
| Beta vs S&P 500 | 0.75 | 1.28 |
| Max drawdown (3Y) | -42.9% | -22.8% |
| Market cap | $0.6B | – |
| P/E (trailing) | 14.4 | – |
| Dividend yield | 1.15% | 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 | GCBC | QQQ |
|---|---|---|
| 2022 | +57.9% | -32.6% |
| 2023 | -0.6% | +54.9% |
| 2024 | -0.6% | +25.6% |
| 2025 | -18.5% | +20.8% |
| 2026 | +57.6% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are GCBC and QQQ good diversifiers for each other?
Yes: at 0.18, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between GCBC and QQQ?
The GCBC/QQQ correlation stands at 0.18 on a 3-year window (1 year: -0.14, 5 years: 0.15), computed from weekly returns as of 2026-08-27.
Is QQQ a good diversifier for GCBC?
Yes: at 0.18, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.18 mean?
On the −1 to +1 scale, 0.18 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/gcbc-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/gcbc-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: GCBC correlations · QQQ correlations
