ECOR vs QQQ: Correlation
Measured on weekly returns over the past three years, electroCore, Inc. (ECOR) and Invesco QQQ Trust (QQQ) carry a correlation of 0.30, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ECOR and QQQ?
On 3 years of weekly data the ECOR/QQQ correlation comes out at 0.30, moderate. The relationship has been stable: the 1-year correlation (0.31) sits close to the 3-year figure. The 5-year figure is 0.22, and annualized covariance runs at 492.5 %².
Within ECOR's tracked universe of 12 assets, QQQ comes in at #7 by 3-year correlation. Correlation aside, the last 12 months split them widely, with ECOR ahead by 48.7 points (+75.0% versus +26.3%). Note the risk asymmetry: ECOR runs 4.3 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
ECOR vs QQQ: side by side
| ECOR (electroCore, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | +75.0% | +26.3% |
| 5-year return | -37.8% | +95.4% |
| Volatility (ann.) | 83.7% | 19.6% |
| Beta vs S&P 500 | 1.73 | 1.28 |
| Max drawdown (3Y) | -77.7% | -22.8% |
| Market cap | $0.1B | – |
| 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 | ECOR | QQQ |
|---|---|---|
| 2022 | -55.9% | -32.6% |
| 2023 | +54.4% | +54.9% |
| 2024 | +172.3% | +25.6% |
| 2025 | -72.3% | +20.8% |
| 2026 | +116.5% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ECOR and QQQ good diversifiers for each other?
A fair diversifier. At 0.30, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ECOR and QQQ?
As of 2026-08-27, the correlation of weekly returns between ECOR and QQQ is 0.30 over 3 years, 0.31 over 1 year and 0.22 over 5 years.
Is QQQ a good diversifier for ECOR?
A fair diversifier. At 0.30, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.30 mean?
On the −1 to +1 scale, 0.30 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/ecor-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ecor-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ECOR correlations · QQQ correlations
